PI3301-X0-LGIZ [VICOR]
8V to 36Vin Cool-Power; 8V至36VIN冷电源
| 型号： | PI3301-X0-LGIZ |
| 厂家： | 
VICOR CORPORATION |
| 描述： | 8V to 36Vin Cool-Power |
| 文件： | 总39页 (文件大小：1430K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PI33XX‐X0‐LGIZ
Cool‐Power®
8V to 36Vin Cool‐Power® ZVS Buck Regulator Family
Description
Features
The PI33XX is a family of high efficiency, wide input
range DC‐DC ZVS‐Buck regulators integrating
controller, power switches, and support components
all within a high density System‐in‐Package (SiP). The
integration of a high performance Zero‐Voltage
Switching (ZVS) topology, within the PI33XX series,
increases point of load performance providing best in
class power efficiency. The PI33XX requires only an
external inductor and minimal capacitors to form a
complete DC‐DC switching mode buck regulator.
High efficiency up to 98%
ZVS‐Buck Topology
Wide input voltage range of 8V to 36V
Very‐Fast transient response
High accuracy pre‐trimmed output voltage
User adjustable soft‐start & tracking
Power‐up into pre‐biased load (select versions)
Parallel capable with single wire current sharing
Input Over/Under Voltage Lockout (OVLO/UVLO)
Output Overvoltage Protection (OVP)
Over Temperature Protection (OTP)
Fast and slow current limits
Output Voltage
Device
Iout Max
10A
Set
Range
‐40°C to 125°C operating range (TJ)
Optional I2C functionality & programmability:
PI3311‐X0‐LGIZ
PI3312‐X0‐LGIZ
PI3301‐X0‐LGIZ
PI3302‐X0‐LGIZ
PI3303‐X0‐LGIZ
PI3305‐X0‐LGIZ
1.0V
1.00 to 1.4
2.5V
3.3V
5.0V
12V
15V
2.0 to 3.1
2.3 to 4.1
10A
Vout margining
Fault reporting
Enable and SYNCI pin polarity
Phase delay (for interleaving multiple
regulators)
10A
3.3 to 6.5
10A
6.5 to 13.0
10.0 to 16.0
8A
Applications
High efficiency systems
8A
Computing, Communications, Industrial,
Automotive Equipment
High voltage battery operation
Table 1 ‐ PI33XX Portfolio. Additional versions available for
higher 18A current, output voltages (Vout) of 1.5 to 1.9V,
and Vout >15.
The Zero Voltage Switching (ZVS) architecture also
enables high frequency operation while minimizing
switching losses and maximizing efficiency. The high
switching frequency operation reduces the size of the
external filtering components, improves power
density, and enables very fast dynamic response to
line and load transients. The PI33XX series sustains
high switching frequency all the way up to the rated
input voltage without sacrificing efficiency and, with
its 20ns minimum on‐time, supports large step down
conversions up to 36Vin.
Package Information
10mm x 14mm x 2.6mm LGA SiP
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 1 of 39
I2C is a trademark of NXP Semiconductors
Contents
Order Information...............................................3
ENABLE (EN)..................................................30
Switching Frequency Synchronization ..........30
Output Voltage Trimming .............................30
Soft‐Start.......................................................30
Remote Sensing ............................................31
Output Current Limit Protection...................31
Input Under‐Voltage Lockout .......................31
Input Over Voltage Lockout ..........................31
Output Over Voltage Protection...................31
Over Temperature Protection.......................31
Pulse Skip Mode (PSM) .................................31
Variable Frequency Operation......................32
Parallel Operation.........................................32
I2C Bus (PI33XX‐20 and PI33XX‐21 only) .......32
Application Description.....................................33
Output Voltage Programming.......................33
Soft‐Start Adjust and Tracking ......................34
Inductor Pairing.............................................34
Input and Output Filter Considerations........35
Layout Guidelines..............................................36
Recommended PCB Footprint and Stencil........37
Package Drawings .............................................38
Warranty...........................................................39
PI33XX Efficiency.................................................3
Pin Description....................................................4
Package Pin‐Out..................................................4
Absolute Maximum Ratings at 25°C ...................5
PI3311‐X0 (1.0 VOUT) Electrical Characteristics.6
Electrical Specifications...................................6
PI3311‐X0 Typical Characteristics ...................8
PI3312‐X0 (2.5 Vout) Electrical Characteristics.10
Electrical Specifications.................................10
PI3312‐X0 Typical Characteristics .................12
PI3301‐X0 (3.3 Vout) Electrical Characteristics.14
Electrical Specifications.................................14
PI3301‐X0 Typical Characteristic...................16
PI3302‐X0 (5.0Vout) Electrical Characteristics..18
Electrical Specifications.................................18
PI3302‐X0 Typical Characteristics .................20
PI3303‐X0 (12Vout) Electrical Characteristics...22
Electrical Specifications.................................22
PI3303‐X0 Typical Characteristics .................24
PI3305‐X0 (15 Vout) Electrical Characteristics..26
Electrical Specifications.................................26
PI3305‐X0 Typical Characteristics .................28
Functional Description......................................30
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 2 of 39
Order Information
Output Range
Range
Iout
Max
Cool-Power
Package
Transport Media
Set
PI3311‐00‐LGIZ
PI3312‐00‐LGIZ
PI3301‐00‐LGIZ
PI3302‐00‐LGIZ
PI3303‐00‐LGIZ
PI3305‐00‐LGIZ
1.0V
2.5V
3.3V
5.0V
12V
1.00 to 1.4V
2.0V to 3.1V
2.3 to 4.1V
3.3 to 6.5V
6.5 to 13.0V
10.0 to 16.0V
10A
10A
10A
10A
8A
TRAY
TRAY
TRAY
TRAY
TRAY
TRAY
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
15V
8A
Higher Current Versions*
PI3311‐01‐LGIZ
PI3312‐01‐LGIZ
PI3301‐01‐LGIZ
I2C Functionality & Programmability*
1.0V
2.5V
3.3V
1.0 to 1.4V
2.0 to 3.1V
2.3 to 4.1V
18A
18A
18A
TRAY
TRAY
TRAY
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
PI3311‐20‐LGIZ
PI3312‐20‐LGIZ
PI3301‐20‐LGIZ
PI3302‐20‐LGIZ
PI3303‐20‐LGIZ
PI3305‐20‐LGIZ
PI3311‐21‐LGIZ
PI3312‐21‐LGIZ
PI3301‐21‐LGIZ
1.0V
2.5V
3.3V
5.0V
12V
1.0 to 1.4V
2.0 to 3.1V
2.3 to 4.1V
3.30 to 6.5V
6.5 to 13.0V
10.0 to 16.0V
1.0 to 1.4V
2.0 to 3.1V
2.3 to 4.1V
10A
10A
10A
10A
8A
TRAY
TRAY
TRAY
TRAY
TRAY
TRAY
TRAY
TRAY
TRAY
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
10mm x 14mm 123‐pin LGA
15V
8A
1.0V
2.5V
3.3V
18A
18A
18A
*
Please contact Picor for availability
PI33XX Efficiency
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 3 of 39
Pin Description
Name
Number
Description
Signal ground: Internal logic ground for EA, TRK, SYNCI, SYNCO, ADJ and I2C (options)
communication returns. SGND and PGND are star connected within the regulator package.
SGND
Block 1
PGND
VIN
Block 2
Block 3
Block 5
Block 4
A1
Power ground: VIN and VOUT power returns
Input voltage: and sense for UVLO, OVLO and feed forward ramp
Output voltage: and sense for power switches and feed‐forward ramp
Switching node: and ZVS sense for power switches
VOUT
VS1
PGD
EAO
Parallel Good: Used for parallel timing management intended for lead regulator.
Error amp output: External connection for additional compensation and current sharing.
A2
Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled;
EN
A3
A5
B1
Asserted low, regulator output disabled. Polarity is programmable via I2C interface.
REM
ADJ
Remote Sense: High side connection. Connect to output regulation point.
Adjust input: An external resistor may be connected between ADJ pin and SGND or VOUT to trim
the output voltage up or down.
Soft‐start and track input: An external capacitor may be connected between TRK pin and SGND
to decrease the rate of rise during soft‐start.
TRK
C1
K3, A4
K4
NC
No Connect: Leave pins floating.
Synchronization output: Outputs a low signal for ½ of the minimum period for synchronization of
other converters.
SYNCO
Synchronization input: Synchronize to the falling edge of external clock frequency. SYNCI is a high
impedance digital input node and should always be connected to SGND when not in use.
SYNCI
K5
SDA
D1
E1
Data Line: Connect to SGND for PI33XX‐10 and ‐11. For use with PI33XX‐20 and ‐21 only.
Clock Line: Connect to SGND for PI33XX‐10 and ‐11. For use with PI33XX‐20 and ‐21 only.
Tri‐state Address : No connect for PI33XX‐10 and ‐11. For use with PI33XX‐20 and ‐21 only.
Tri‐state Address : No connect for PI33XX‐10 and ‐11. For use with PI33XX‐20 and ‐21 only.
SCL
ADR1
ADR0
H1
G1
Package Pin‐Out
Block 1: B2‐4, C2‐4, D2‐3, E2‐3, F1‐3, G2‐3,
H2‐3, J1‐3, K1‐2
Block 2: A8‐10, B8‐10, C8‐10, D8‐10, E4‐10,
F4‐10, G4‐10, H4‐10, J4‐10, K6‐10
Block 3: G12‐14, H12‐14, J12‐14, K12‐14
Block 4: A12‐14, B12‐14, C12‐14, D12‐14,
E12‐14,
123‐Lead LGA (10mm x 14mm)
Top view
Block 5: A6‐7, B6‐7, C6‐7, D6‐7
TJmax = 125 °C, θJA = 22 °C/W
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 4 of 39
Absolut
e Maximu
m Ratings at 25°C
Note: All voltage nodes are referenced to PGND
VIN
‐0.7V to 36V / 18A DC
‐0.7 to 36V, ‐4V for 5ns
VS1
VOUT
See relevant product section
100mA
SGND
PGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA
‐0.3V to 5.5V / 5mA
‐65°C to 150°C
‐40°C to 140°C
260°C
Storage Temperature
Operating Junction Temperature
Soldering Temperature for 20 seconds
ESD Rating
2kV HBM
Vout
VS1
VIN
Q2
VOUT
Q1
R4
REM
R1
Power
Control
EAO
VCC
R3
ADJ
-
ZVS Control
+
1V R2
SYNCO
SYNCI
PGD
TRK
EN
Memory
Interface
PGND
0Ω
Fiure 1: Simplifed Block Diagram
(I2C pins SCL, SDA, ADR0, ad ADR1 ony ativfor PI33XX‐20 and PI33XX‐21 versions)
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 5 of 39
PI3311‐X0 (1.0 VOUT) Electrical Characteristics
Electrical Specifications
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V, L1=120nH
Parameter
Symbol
Min
Typ
Max
Units Conditions
Vin = 24V, TC = 25°C,
Iout = 10 A
Efficiency
87.7
%
Output
Output Voltage
VOUT_DC
VOUT_DC
VOUT_DC
1.0
1.0
1.0
V
V
V
0 °C <TJ <70°C
Output Voltage Total Regulation
Output Voltage Range
‐40 °C <TJ <125°C
0.987
1.013
1.4
@ 25°C,
12V<Vin<36V
@ 25°C,
0.5A<Iout<10A
Iout=5A, Cout=8x100μF,
20MHz BW
Line Regulation
0.1
0.1
20
0.15
0.15
%
%
∆VOUT(∆VIN)
Load Regulation
∆VOUT(∆IOUT
)
Output Voltage Ripple
mVp‐p
VOUT_AC
Continuous Output Current Range
Current Limit
0
10
13
A
A
See Iout vs. TA Curves
IOUT_DC
IOUT_CL
10.2
Input Current
Vin = 24V, TC = 25°C,
Iout=10A
Vin=24V, Iout=0A
Cin=4x4.7µF MLCC
Input Current
IIN_DC
IIN_SS
476
200
mA
mA
Inrush Input Current At Soft Start
Input Current At Output Short
(Fault Condition)
Protection
300
mA
IIN_Short
UVLO Threshold
UVLO Hysteresis
OVLO Threshold
OVLO Hysteresis
VUVLO
VUVLO_HYS
VOVLO
7.08
37
7.45
0.37
38.4
0.77
7.82
40
V
V
V
V
VOVLO_HYS
Number of the
UVLO/OVLO Fault Delay Time
128
Cycles switching frequency
cycles
tf_DLY
UVLO/OVLO Response Time
OVP
500
20
ns
%
+1% overdrive
Above VOUT
tf
VOVP
VOTP
Over‐Temperature Fault Threshold
Over‐Temperature Restart
Hysteresis
130
135
140
°C
30
°C
VOTP_HYS
Timing
Vin ≥ 18V, Iout ≤ 8A
Switching Frequency
Fault Restart Delay
380
30
kHz
ms
fS
(1)
tFR_DLY
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 6 of 39
PI3311‐X0 Electrical Specifications
(continued)
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V,
Parameter
Symbol
Min
Typ
24
Max
36
Units
Conditions
Input Power
Input Voltage
VIN_DC
VIN_SR
8
V
Input Voltage Slew Rate
1
V/μs
2
2.5
Disabled
Enabled
Input Quiescent Current
IQ_VIN
mA
Soft Start And Tracking Function
TRK Active Range (Nominal)
TRK Offset Voltage / Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft‐Start Time
0
1
V
VTRK
VTRK_OV
ITRK
20
‐70
40
‐50
6.8
2.2
60
‐30
mV
µA
mA
ms
ITRK_DIS
tSS
2.6
CTRK = 0
Enable
High Threshold
VEN_HI
VEN_LO
VEN_HYS
VEN_PU
VEN_PD
IEN_SO
0.9
0.7
100
1
0.8
200
2
1.1
0.9
300
V
V
Low Threshold
Threshold Hysteresis
Enable Pull‐Up Voltage
Enable Pull‐Down Voltage
Source Current
mV
V
0
V
‐50
50
uA
uA
Sink Current
IEN_SK
Sync In (SYNCI)
With respect to the
set switching
frequency
Synchronization Frequency Range
∆fSYNCI
50
0
110
%
SYNCI Threshold
VSYNCI
2.5
V
°
SYNCI Programmable Phase Shift
Sync Out (SYNCO)
∆φSYNCI
‐270
SYNCO High
SYNCO Low
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
4.5
0
5.2
0.5
20
V
V
Source 1mA.
Sink 1mA.
20pF load
SYNCO Rise Time
10
10
ns
SYNCO Fall Time
tSYNCO_FT
20
ns
20pF load
Note 1: Refer to Switching Frequency vs. Iout graph
ꢀ
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 7 of 39
PI3311‐X0 Typical Characteristics
Efficiency at 25°C
Total Power Loss (including external components)
9
7
[
331101
331102
Ambient Temperature vs. Load Current Curve
Transient Response: 24V to 1.0V
V
V
9
t C
Load Step: 2A to 7A at 5A/us
Cout = 8X 100 µF Ceramic
331104
0 LFM, SiP Only
331103
Switching frequency vs load current
Output ripple: Vin =24V, Vout = 1.0V at 10A
1
L1 = 120nH
331105
Vout = 50mV/Div
2.0us/Div
331106
Cout = 8X 100 µF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 8 of 39
PI3311‐X0 Typical Characteristics
(continued)
Output ripple: Vin =24V, Vout = 1.0V at 5A
Short circuit test
Vout = 500mV/Div =Ch2
Iin = 500mA/Div = Ch4
tdelay_fault = 1ms
331108
Vout = 50mV/Div
2.0us/Div
Cout = 8X 100 µF Ceramic
331107
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 9 of 39
PI3312‐X0 (2.5 Vout) Electrical Characteristics
Electrical Specifications
Unless otherwise specified: ‐40C < TJ < 125C, Vin = 24V, L1=200 nH
Parameter
Symbol
Min
Typ
Max
Units Conditions
Vin = 24V, TC = 25°C,
Iout = 10 A
Efficiency
91.3
%
Output
Output Voltage
VOUT_DC
VOUT_DC
2.50
V
V
V
%
0 °C <TJ <70°C
Output Voltage Total Regulation
Output Voltage Range
Line Regulation
‐40 °C <TJ <125°C
2.465
2.0
2.50
2.5
0.1
2.535
3.1
0.15
VOUT_DC
@ 25°C 12V<Vin<36V
@ 25°C,
0.5A<Iout<10A
Iout=5A,
∆VOUT(∆VIN)
Load Regulation
0.1
0.15
%
∆VOUT(∆IOUT
)
Output Voltage Ripple
28
mVp‐p Cout=4x100μF,
VOUT_AC
20MHz BW
Continuous Output Current Range
Current Limit
0
10
A
A
IOUT_DC
IOUT_CL
12
Input Current
Vin = 24V, TC = 25°C,
Iout=10A
Vin=24V, Iout=0A
Cin=4x4.7µF MLCC
Input Current
IIN_DC
IIN_SS
1.14
200
A
Soft‐Start Current
mA
Input Current At Output Short (Fault
Condition)
300
mA
IIN_Short
Protection
UVLO Threshold
UVLO Hysteresis
OVLO Threshold
OVLO Hysteresis
VUVLO
VUVLO_HYS
VOVLO
7.08
37
7.45
0.37
38.4
0.77
7.82
40
V
V
V
V
VOVLO_HYS
Number of the
UVLO/OVLO Fault Delay Time
128
Cycles switching frequency
cycles
tf_DLY
UVLO/OVLO Response Time
OVP Threshold
500
20
ns
%
+1% overdrive
Above VOUT
tf
VOVP
Over‐Temperature Fault Threshold
Over‐Temperature Restart Hysteresis
Timing
130
135
30
140
°C
°C
VOTP
VOTP_HYS
Vin ≥ 18V, Iout ≤ 8A (1)
Switching Frequency
Fault Restart Delay
500
30
kHz
ms
fS
tFR_DLY
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 10 of 39
PI3312‐X0 Electrical Specifications
(continued)
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V,
Parameter
Symbol
Min
Typ
24
Max
36
Units
Conditions
Input Power
Input Voltage
VIN_DC
VIN_SR
8
V
Input Voltage Slew Rate
1
V/μs
2
2.5
Disabled
Enabled
Input Quiescent Current
IQ_VIN
mA
Soft Start And Tracking Function
TRK Active Range (Nominal)
TRK Offset Voltage / Disable Threshold
Charge Current (Soft –Start)
Discharge Current (Fault)
Soft‐Start Time
0
1
V
VTRK
VTRK_OV
ITRK
20
‐70
40
‐50
6.8
2.2
60
‐30
mV
µA
mA
ms
ITRK_DIS
tSS
2.6
CTRK = 0, 0A< Iout ≤ 8A
Enable
Enable High Threshold
Enable Low Threshold
Enable Threshold Hysteresis
Enable Pull‐Up Voltage
Enable Pull‐Down Voltage
Source Current
VEN_HI
VEN_LO
VEN_HYS
VEN_PU
VEN_PD
IEN_SO
0.9
0.7
100
1
0.8
200
2
1.1
0.9
300
V
V
mV
V
0
V
‐50
50
uA
uA
Sink Current
IEN_SK
Sync In (SYNCI)
With respect to the
set switching
frequency
Synchronization Frequency Range
∆fSYNCI
50
0
110
270
%
SYNCI Threshold
VSYNCI
2.5
V
°
SYNCI Programmable Phase Shift
Sync Out (SYNCO)
∆φSYNCI
SYNCO High
SYNCO Low
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
4.5
0
5.2
0.5
20
V
V
Source 1mA.
Sink 1mA.
20pF load
SYNCO Rise Time
10
10
ns
SYNCO Fall Time
tSYNCO_FT
20
ns
20pF load
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 11 of 39
PI3312‐X0 Typical Characteristics
Efficiency at 25°C
Total Power Loss (including external components)
0
2
[
331202
L1=200nH
331201
Transient Response: 24V to 2.5V and 5A to Load Step
Ambient Temperature vs. Load Current Curve
1
Vout = 100mV/Div. = Ch 1
Iout = 2A/Div. = Ch 4
200us/Div.
331204
]
0 LFM, SiP Only
331203
Cout = 4 x 100µF Ceramic
Switching frequency vs. load current
Output ripple: Vin = 24V and Vout = 2.5V at 10A
L1 = 200nH
331205
Vout = 20mV/Div.
2.0us/Div.
331206
Cout = 4 x 100µF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 12 of 39
PI3312‐X0 Typical Characteristics
(continued)
Short circuit test
Output ripple: Vin = 24V and Vout = 2.5V at 5A
Vout = 1V/Div. = Ch4
Iin = 500mA/Div. = Ch1
tdelay_fault = 1ms
331208
Vout = 20mV/Div.
2.0us/Div.
Cout = 4 x 100µF Ceramic
331207
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 13 of 39
PI3301‐X0 (3.3 Vout) Electrical Characteristics
Electrical Specifications
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V, L1=200 nH
Parameter
Symbol
Min
Typ
Max
Units Conditions
Vin = 24V, TC = 25°C,
Iout = 10 A
Efficiency
92.2
%
Output
Output Voltage
VOUT_DC
VOUT_DC
3.30
V
V
V
%
0 °C <TJ <70°C
Output Voltage Total Regulation
Output Voltage Range
Line Regulation
‐40 °C <TJ <125°C
3.25
2.3
3.30
3.3
0.10
3.36
4.1
0.15
VOUT_DC
@ 25°C 12V<Vin<36V
@ 25°C,
0.5A<Iout<10A
Iout=5A,
∆VOUT(∆VIN)
Load Regulation
0.10
0.15
%
∆VOUT(∆IOUT
)
Output Voltage Ripple
37.5
mVp‐p Cout=4x100μF,
VOUT_AC
20MHz BW
Continuous Output Current Range
Current Limit
0
10
A
A
IOUT_DC
IOUT_CL
12
Input Current
Vin = 24V, TC = 25°C,
Iout=10A
Vin=24V, Iout=0A
Cin=4x4.7µF MLCC
Input Current
IIN_DC
IIN_SS
1.49
200
A
Soft‐Start Input Current
mA
Input Current At Output Short (Fault
Condition)
300
mA
IIN_Short
Protection
UVLO Threshold
UVLO Hysteresis
OVLO Threshold
OVLO Hysteresis
VUVLO
VUVLO_HYS
VOVLO
7.08
37
7.45
0.37
38.4
0.77
7.82
40.0
V
V
V
V
VOVLO_HYS
Number of the
UVLO/OVLO Fault Delay Time
128
Cycles switching frequency
cycles
tf_DLY
UVLO/OVLO Response Time
OVP
500
20
ns
%
+1% overdrive
Above VOUT
tf
VOVP
Over‐Temperature Fault Threshold
Over‐Temperature Restart Hysteresis
Timing
130
135
30
140
°C
°C
VOTP
VOTP_HYS
Vin ≥ 12V, Iout ≤ 10A
Switching Frequency
Fault Restart Delay
650
30
kHz
ms
fS
(1)
tFR_DLY
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 14 of 39
PI3301‐X0 Electrical Specifications
(continued)
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V,
Parameter
Symbol
Min
Typ
24
Max
36
Units
Conditions
Input Power
Input Voltage
VIN_DC
VIN_SR
8
V
Input Voltage Slew Rate
1
V/μs
2
2.5
Disabled
Enabled
Input Quiescent Current
IQ_VIN
mA
Soft Start And Tracking Function
TRK Active Range (Nominal)
TRK Offset Voltage / Disable Threshold
Charge Current (Soft –Start)
Discharge Current (Fault)
0
1
V
VTRK
VTRK_OV
ITRK
20
‐70
40
‐50
6.8
60
‐30
mV
µA
mA
ITRK_DIS
No external CTRK, 0A<
Iout ≤ 8A
Soft‐Start Time
2.2
2.6
ms
tSS
Enable
Enable High Threshold
Enable Low Threshold
Enable Threshold Hysteresis
Enable Pull‐Up Voltage
Enable Pull‐Down Voltage
Source Current
VEN_HI
VEN_LO
VEN_HYS
VEN_PU
VEN_PD
IEN_SO
0.9
0.7
100
1
0.8
200
2
1.1
0.9
300
V
V
mV
V
0
V
‐50
50
uA
uA
Sink Current
IEN_SK
Sync In (SYNCI)
With respect to the
set switching
frequency
Synchronization Frequency Range
∆fSYNCI
50
0
110
270
%
SYNCI Threshold
VSYNCI
2.5
V
°
SYNCI Programmable Phase Shift
Sync Out (SYNCO)
∆φSYNCI
SYNCO High
SYNCO Low
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
4.5
0
5.2
0.5
20
V
V
Source 1mA.
Sink 1mA.
20pF load
SYNCO Rise Time
10
10
ns
SYNCO Fall Time
tSYNCO_FT
20
ns
20pF load
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 15 of 39
PI3301‐X0 Typical Characteristic
Efficiency at 25°C
Total Power Loss (including external components)
2
9
0
(
330102
L1=200nH
330101
Transient Response: 24V to 3.3V
Ambient Temperature vs. Load Current Curve
1
t C
Load Step: 2A to 7A
Cout = 4 x 100µF Ceramic
330104
0 LFM
,
SiP Package Only
330103
Output ripple: Vin = 24V, Vout = 3.3V at 10A
Switching frequency vs. load current
L1 = 200nH
330105
Vout = 50mV/Div
2.0us/Div
330106
Cout = 4 x 100µF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 16 of 39
PI3301‐X0 Typical Characteristic
(continued)
Short circuit test
Output ripple Vin = 24V, Vout = 3.3V at 5A
tdelay_fault = 1ms
330108
Vout = 50mV/Div
2.0us/Div
330107
Cout = 4 x 100µF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 17 of 39
PI3302‐X0 (5.0Vout) Electrical Characteristics
Electrical Specifications
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V, L1=200nH
Parameter
Efficiency
Symbol
Min
Typ
Max
Units Conditions
Vin = 24V, TC = 25°C,
Iout=10A
Efficiency
93.9
5.00
%
Output
Output Voltage
V
V
V
%
0 °C <TJ <70°C
Output Voltage Total Regulation
Output Voltage Range
Line Regulation
VOUT_DC
‐40 °C <TJ <125°C
4.93
3.3
5.00
5.0
0.1
5.07
6.5
0.15
@ 25°C 12V<Vin<36V
@ 25°C,
0.5A<Iout<10A
Iout=5A,
∆VOUT(∆VIN)
Load Regulation
0.1
0.15
%
∆VOUT(∆IOUT
)
Output Voltage Ripple
30
mVp‐p Cout=4x47μF20MHz
VOUT_AC
BW
Continuous Output Current Range
Current Limit
0
10
A
A
IOUT_DC
IOUT_CL
10.2
11.2
12.6
Input Current
Vin = 24V, TC = 25°C,
A
Input Current
IIN_DC
IIN_SS
2.23
100
Iout=10A
Vin=24V, Iout=0A
Inrush Input Current At Startup
mA
Cin=4x4.7µF MLCC
mA
Input Current At Output Short (Fault
Condition)
300
IIN_Short
Protection
UVLO Threshold
UVLO Hysteresis
OVLO Threshold
OVLO Hysteresis
VUVLO
VUVLO_HYS
VOVLO
7.08
37
7.45
0.37
38.4
0.77
7.82
40
V
V
V
VOVLO_HYS
V
Number of the
Cycles switching frequency
cycles
UVLO/OVLO Fault Delay Time
128
tf_DLY
UVLO/OVLO Response Time
OVP
500
20
ns
%
+1% overdrive
Above VOUT
tf
VOVP
Over‐Temperature Fault Threshold
Over‐Temperature Restart Hysteresis
Timing
130
135
30
140
°C
°C
VOTP
VOTP_HYS
Vin ≥ 18V, Iout ≤ 10A
Switching Frequency
Fault Restart Delay
1.0
30
MHz
ms
fS
(1)
tFR_DLY
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 18 of 39
PI3302‐X0 Electrical Specifications
(continued)
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V,
Parameter
Symbol
Min
Typ
Max
Units
Conditions
Input Power
Input Voltage
VIN_DC
VIN_SR
8
24
36
1
V
Input Voltage Slew Rate
V/μs
2
2.5
Disabled
Enabled
Input Quiescent Current
IQ_VIN
mA
Soft Start And Tracking Function
TRK Active Range (Nominal)
TRK Offset Voltage / Disable Threshold
Charge Current (Soft –Start)
Discharge Current (Fault)
0
1
V
VTRK
VTRK_OV
ITRK
20
‐70
40
‐50
6.8
60
‐30
mV
µA
mA
ITRK_DIS
No external CTRK, 0A<
Iout ≤ 8A
Soft‐Start Time
2.2
2.6
ms
tSS
Enable
Enable High Threshold
Enable Low Threshold
Enable Threshold Hysteresis
Enable Pull‐Up Voltage
Enable Pull‐Down Voltage
Source Current
VEN_HI
VEN_LO
VEN_HYS
VEN_PU
VEN_PD
IEN_SO
0.9
0.7
100
1
0.8
200
2
1.1
0.9
300
V
V
mV
V
0
V
‐50
50
uA
uA
Sink Current
IEN_SK
Sync In (SYNCI)
With respect to the
set switching
frequency
Synchronization Frequency Range
∆fSYNCI
50
0
110
270
%
SYNCI Threshold
VSYNCI
2.5
V
°
SYNCI Programmable Phase Shift
Sync Out (SYNCO)
∆φSYNCI
SYNCO High
SYNCO Low
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
4.5
0
5.2
0.5
20
V
V
Source 1mA.
Sink 1mA.
20pF load
SYNCO Rise Time
10
10
ns
SYNCO Fall Time
tSYNCO_FT
20
ns
20pF load
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 19 of 39
PI3302‐X0 Typical Characteristics
Efficiency at 25°C
Total Power Loss (including external components)
n
n
n
8
I
A
330202
L1=200nH
330201
Transient Response: 24V to 5V
Ambient Temperature vs. Load Current Curve
1
Load Step: 2A to 7A
Cout = 4 X 47uF Ceramic
5A/us
330204
]
0 LFM, SiP Only
330203
Switching frequency vs. load current
Output ripple: Vin = 24V, Vout = 5.0V at 10A
L1=200nH
330205
Vout = 50mV/Div
1.0us/Div
330206
Cout = 4 X 47uF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 20 of 39
PI3302‐X0 Typical Characteristic
(continued)
Output ripple Vin = 24V, Vout = 5.0V at 5A
Short circuit test
Vout = 50mV/Div
1.0us/Div
330207
tdelay_fault = 1ms
330208
Cout = 4 X 47uF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 21 of 39
PI3303‐X0 (12Vout) Electrical Characteristics
Electrical Specifications
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V, L1=230nH
Parameter
Symbol
Min
Typ
Max
Units Conditions
Vin = 24V, TC = 25°C,
Iout=8A
Efficiency
96.5
%
Output
Output Voltage
VOUT_DC
VOUT_DC
12.0
V
V
V
%
0 °C <TJ <70°C
Output Voltage Total Regulation
Output Voltage Range
Line Regulation
‐40 °C <TJ <125°C
11.82
6.5
12.0
12
0.1
12.18
13.0
0.15
VOUT_DC
@ 25°C 16V<Vin<36V
@ 25°C,
0.5A<Iout<8A
Iout=4A,
∆VOUT(∆VIN)
Load Regulation
0.1
0.15
%
∆VOUT(∆IOUT
)
Output Voltage Ripple
60
mVp‐p Cout=4x22μF, 20MHz
VOUT_AC
BW
Continuous Output Current Range
Current Limit
0
8
A
A
IOUT_DC
IOUT_CL
8.1
10
Input Current
Vin = 24V, TC = 25°C,
A
Input Current
IIN_DC
IIN_SS
4.15
200
Iout=8A
Vin=24V, Iout=0A
Inrush Input Current At Startup
mA
Cin=4x4.7µF MLCC
mA
Input Current At Output Short (Fault
Condition)
300
IIN_Short
Protection
UVLO Threshold
UVLO Hysteresis
OVLO Threshold
OVLO Hysteresis
VUVLO
VUVLO_HYS
VOVLO
13.57
37
14.29
0.37
38.4
0.77
15.0
40
V
V
V
VOVLO_HYS
V
Number of the
Cycles switching frequency
cycles
UVLO/OVLO Fault Delay Time
128
tf_DLY
UVLO/OVLO Response Time
OVP
500
20
ns
%
+1% overdrive
Above VOUT
tf
VOVP
Over‐Temperature Fault Threshold
Over‐Temperature Restart Hysteresis
Timing
130
135
30
140
°C
°C
VOTP
VOTP_HYS
Vin ≥ 18V, Iout ≤ 8A
Switching Frequency
Fault Restart Delay
1.4
30
MHz
ms
fS
(1)
tFR_DLY
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 22 of 39
PI3303‐X0 Electrical Specifications
(continued)
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V,
Parameter
Symbol
Min
Typ
24
Max
36
Units
Conditions
Input Power
Input Voltage
VIN_DC
VIN_SR
15.5
V
Input Voltage Slew Rate
1
V/μs
2
2.5
Disabled
Enabled
Input Quiescent Current
IQ_VIN
mA
Soft Start And Tracking Function
TRK Active Range (Nominal)
TRK Offset Voltage / Disable Threshold
Charge Current (Soft –Start)
Discharge Current (Fault)
0
1
V
VTRK
VTRK_OV
ITRK
20
‐70
40
‐50
6.8
60
‐30
mV
µA
mA
ITRK_DIS
No external CTRK, 0A<
Iout ≤ 8A
Soft‐Start Time
2.2
2.6
ms
tSS
Enable
Enable High Threshold
Enable Low Threshold
Enable Threshold Hysteresis
Enable Pull‐Up Voltage
Enable Pull‐Down Voltage
Source Current
VEN_HI
VEN_LO
VEN_HYS
VEN_PU
VEN_PD
IEN_SO
0.9
0.7
100
1
0.8
200
2
1.1
0.9
300
V
V
mV
V
0
V
‐50
50
uA
uA
Sink Current
IEN_SK
Sync In (SYNCI)
With respect to the
set switching
frequency
Synchronization Frequency Range
∆fSYNCI
50
0
110
270
%
SYNCI Threshold
VSYNCI
2.5
V
°
SYNCI Programmable Phase Shift
Sync Out (SYNCO)
∆φSYNCI
SYNCO High
SYNCO Low
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
4.5
0
5.2
0.5
20
V
V
Source 1mA.
Sink 1mA.
20pF load
SYNCO Rise Time
10
10
ns
SYNCO Fall Time
tSYNCO_FT
20
ns
20pF load
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 23 of 39
PI3303‐X0 Typical Characteristics
Efficiency at 25°
Total Power Loss (including external components)
100
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
95
90
85
80
75
70
18Vin, 12Vout
24Vin, 12Vout
36Vin, 12Vout
65
60
55
50
1.0
24Vin 12Vout
0.5
36Vin, 12Vout
0.0
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Iout [A]
Iout [A]
L1=230nH
330301
330302
Transient Response: 24V to 12V
Ambient Temperature vs. Load Current Curve
1
Load Step: 2A to 6A, 5A/us
Cout = 4 X 22uF Ceramic
330304
n°
O LFM SiP Only
330303
Switching frequency vs. Load current
8A Output Ripple: Vin = 24V, Vout = 12V at 8A
330305
Vout = 50mV/Div
1.0us/Div
330306
Cout = 4 X 22uF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 24 of 39
PI3303‐X0 Typical Characteristics
(continued)
4A Output Ripple
Short circuit test
Vout = 50mV/Div
1.0us/Div
330307
tdelay_fault = 1ms
330308
Cout = 4 X 22uF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 25 of 39
PI3305‐X0 (15 Vout) Electrical Characteristics
Electrical Specifications
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V, L1=230nH
Parameter
Symbol
Min
Typ
Max
Units Conditions
Vin = 24V, TC = 25°C,
Iout = 10 A
Efficiency
97.2
%
Output
Output Voltage
15.0
15.0
15
V
V
V
10 °C <TJ <70°C
Output Voltage Total Regulation
Output Voltage Range
VOUT_DC
‐40 °C <TJ <125°C
14.78
10.0
15.23
16
@ 25°C
Line Regulation
Load Regulation
0.1
0.1
0.15
0.15
%
%
∆VOUT(∆VIN)
18.5V<Vin<36V
@ 25°C, 0.5A<Iout<
8A
∆VOUT(∆IOUT
)
Iout=4A,
Output Voltage Ripple
60
mVp‐p Cout=4x22μF,
VOUT_AC
20MHz BW
Continuous Output Current Range
Current Limit
0
8
A
A
IOUT_DC
IOUT_CL
8.1
10
Input Current
Vin = 24V, TC = 25°C,
Iout=8A
Vin=24V, Iout=0A
Cin=4x4.7µF MLCC
Input Current
IIN_DC
IIN_SS
4.12
200
A
Inrush Input Current At Startup
mA
Input Current At Output Short (Fault
Condition)
300
mA
IIN_Short
Protection
UVLO Threshold
UVLO Hysteresis
OVLO Threshold
OVLO Hysteresis
VUVLO
VUVLO_HYS
VOVLO
16.38
37
17.2
0.37
38.4
0.77
18.1
40
V
V
V
V
VOVLO_HYS
Number of the
UVLO/OVLO Fault Delay Time
128
Cycles switching frequency
cycles
tf_DLY
UVLO/OVLO Response Time
OVP
500
20
ns
%
+1% overdrive
Above Vout
tf
VOVP
Over‐Temperature Fault Threshold
Over‐Temperature Restart Hysteresis
Timing
130
135
30
140
°C
°C
VOTP
VOTP_HYS
Vin ≥ 18.1V, Iout ≤ 8A
Switching Frequency
Fault Restart Delay
1.5
30
MHz
ms
fS
(1)
tFR_DLY
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 26 of 39
PI3305‐X0 Electrical Specifications
(continued)
Unless otherwise specified: ‐40C < TJ < 125C, Vin =24V,
Parameter
Symbol
Min
Typ
Max
Units
Conditions
Input Power
Input Voltage
VIN_DC
VIN_SR
18.6
24
36
1
V
Input Voltage Slew Rate
V/μs
2
2.5
Disabled
Enabled
Input Quiescent Current
IQ_VIN
mA
Soft Start And Tracking Function
TRK Active Range (Nominal)
TRK Offset Voltage / Disable Threshold
Charge Current (Soft –Start)
Discharge Current (Fault)
0
1
V
VTRK
VTRK_OV
ITRK
20
‐70
40
‐50
6.8
60
‐30
mV
µA
mA
ITRK_DIS
No external CTRK, 0A<
Iout ≤ 8A
Soft‐Start Time
2.2
2.6
ms
tSS
Enable
Enable High Threshold
Enable Low Threshold
Enable Threshold Hysteresis
Enable Pull‐Up Voltage
Enable Pull‐Down Voltage
Source Current
VEN_HI
VEN_LO
VEN_HYS
VEN_PU
VEN_PD
IEN_SO
0.9
0.7
100
1
0.8
200
2
1.1
0.9
300
V
V
mV
V
0
V
‐50
50
uA
uA
Sink Current
IEN_SK
Sync In (SYNCI)
With respect to the
set switching
frequency
Synchronization Frequency Range
∆fSYNCI
50
0
110
270
%
SYNCI Threshold
VSYNCI
2.5
V
°
SYNCI Programmable Phase Shift
Sync Out (SYNCO)
∆φSYNCI
SYNCO High
SYNCO Low
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
4.5
0
5.2
0.5
20
V
V
Source 1mA.
Sink 1mA.
20pF load
SYNCO Rise Time
10
10
ns
SYNCO Fall Time
tSYNCO_FT
20
ns
20pF load
ꢀ
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 27 of 39
PI3305‐X0 Typical Characteristics
Efficiency at 25°C
Total Power Loss (including external components)
330502
L1=230nH
330501
Transient Response: 24 to 15V
Ambient Temperature vs. Load Current Curve
0
e[
Load Step: 2A to 6A
5A/us
Cout = 4x22µF Ceramic
330504
O LFM, SiP Only
330503
Output ripple: Vin = 24V, Vout = 15V at 8A
S
witching frequency vs. load current
6
Vout = 100mV/Div
1us/Div
330506
330505
Cout = 4x22µF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 28 of 39
PI3305‐X0 Typical Characteristics
(continued)
Output ripple: Vin = 24V, Vout = 15V at 4A
Short circuit test
330508
Vout = 100mV/Div
1us/Div
330507
Cout = 4x22µF Ceramic
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 29 of 39
Functional Description
applied at SYNCI pin. Phase delay allows PI33XX
regulators to be paralleled and operate in an
interleaving mode.
The PI33XX is a family of highly integrated ZVS‐Buck
regulators. The PI33XX has a set output voltage that is
trimmable within a prescribed range. Performance
and maximum output current are characterized with
a specific external power inductor (see Table 5).
The PI33XX default for SYNCI is to sync with respect
to the falling edge of the applied clock providing 180°
phase shift from SYNCO. This allows for the
paralleling of two PI33XX devices without the need
for further user programming or external sync clock
circuitry. The user can change the SYNCI polarity to
sync with the external clock rising edge.
When using the internal oscillator, the SYNCO pin
provides a 5V clock that can be used to sync other
regulators. Therefore, one PI33XX can act as the lead
regulator and have additional PI33XXs running in
parallel and interleaved.
Figure 2 ‐ ZVS‐Buck with required components
For basic operation, Figure 2 shows the connections
and components required. No additional design or
settings are required.
Output Voltage Trimming
The PI33XX output voltage can be trimmed up from
the preset output by connecting a resistor from ADJ
pin to SGND and can be trimmed down by connecting
a resistor from ADJ pin to VOUT. The Table 2 defines
the voltage ranges for the PI33XX family.
ENABLE (EN)
EN is the enable pin of the converter. The EN Pin is
referenced to SGND and permits the user to turn the
converter on or off. The EN default polarity is a
positive logic assertion. If the EN pin is left floating or
asserted high, the converter output is enabled.
Pulling EN pin below 0.8 Vdc with respect to SGND
will disable the regulator output.
Output Voltage
Device
Set
1.0V
2.5V
3.3V
5.0V
12V
15V
Range
PI3311‐X0‐LGIZ
PI3312‐X0‐LGIZ
PI3301‐X0‐LGIZ
PI3302‐X0‐LGIZ
PI3303‐X0‐LGIZ
PI3305‐X0‐LGIZ
1.00 to 1.4
2.0 to 3.1
2.3 to 4.1
3.3 to 6.5
6.5 to 13.0
10.0 to 16.0
The EN input polarity can be programmed (PI33XX‐20
and PI33XX‐21 versions only) via the I2C data bus.
When the EN pin polarity is programmed for negative
logic assertion; and if the EN pin is left floating, the
regulator output is enabled. Pulling the EN pin above
1.0 Vdc with respect to SGND, will disable the
regulator output.
Table 2 ‐ PI33XX family output voltage ranges. Additional
versions available for output voltages (Vout) of 1.5 to 1.9V
and Vout >15V.
Switching Frequency Synchronization
The SYNCI input allows the user to synchronize the
controller switching frequency by an external clock
Soft‐Start
The PI33XX includes an internal soft‐start capacitor to
ramp the output voltage in 2ms from 0V to full
output voltage. Connecting an external capacitor
from the TRK pin to SGND will increase the start‐up
ramp period. See, “Soft Start Adjustment and Track,”
in the Applications Description section for more
details.
referenced to SGND.
The external clock can
synchronize the unit between 50% and 110% of the
preset switching frequency (fS). For PI33XX‐20 and
PI33XX‐21 versions only, the phase delay can be
programmed via I2C bus with respect to the clock
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 30 of 39
Remote Sensing
Input Over Voltage Lockout
An internal 100Ω resistor is connected between REM
pin and VOUT pin to provide regulation when the
REM is left open. With REM open, the converter will
regulate 100mV above its set point. Connect REM to
the desired reference node to be regulated.
If VIN exceeds the input Over Voltage Lockout (OVLO)
threshold (VOVLO), while the controller is running, the
PI33XX will complete the current cycle and stop
switching. If VIN recovers within 128 switching
cycles, the PI33XX will resume normal operation.
Otherwise, the system will enter a low power state
and sets an OVLO fault. The system will resume
operation when the input voltage falls below 98% of
the OVLO threshold and after the Fault Restart Delay.
The OVLO fault is stored in a Fault Register and can
be read and cleared (PI33XX‐20 and PI33XX‐21
versions only) via I2C data bus.
Output Current Limit Protection
PI33XX has two methods implemented to protect
from output short or over current condition.
Slow Current Limit protection: prevents the output
load from sourcing current higher than the
regulator’s maximum rated current. If the output
current exceeds the Current Limit (IOUT_CL) for 1024us,
a slow current limit fault is initiated and the regulator
is shutdown which eliminates output current flow.
After Fault Restart Delay (tFR_DLY), a soft‐start cycle is
initiated. This restart cycle will be repeated
indefinitely until the excessive load is removed.
Output Over Voltage Protection
The PI33XX family is equipped with output Over
Voltage Protection (OVP) to prevent damage to input
voltage sensitive devices. If the output voltage
exceeds 20% of its set regulated value, the regulator
will complete the current cycle, stop switching and
issue an OVP fault. The system will resume operation
once the output voltage falls below the OVP
threshold and after Fault Restart Delay. The OVP
fault is stored in a Fault Register and can be read and
cleared (PI33XX‐20 and PI33XX‐21 versions only) via
I2C data bus.
Fast Current Limit protection: PI33XX monitors the
regulator inductor current pulse‐by‐pulse to prevent
the output from supplying very high current due to a
sudden low impedance short. If the regulator senses
a high inductor current pulse, it will initiate a fault
and stop switching until Fault Restart Delay ends and
then initiate a soft‐start cycle.
Over Temperature Protection
Both the Fast and Slow current limit faults are stored
in a Fault Register and can be read and cleared
(PI33XX‐20 and PI33XX‐21 versions only) via I2C data
bus.
The internal package temperature is monitored to
prevent system components from reaching their
thermal maximum.
If the Over Temperature
Protection Threshold (OTP) is exceeded (VOTP), the
regulator will complete the current switching cycle,
enter a low power mode, set a fault flag, and will
soft‐start when the internal temperature falls below
Over‐Temperature Restart Hysteresis (VOTP_HYS). The
OTP fault is stored in a Fault Register and can be read
and cleared (PI33XX‐20 and PI33XX‐21 versions only)
via I2C data bus.
Input Under‐Voltage Lockout
If VIN falls below the input Under Voltage Lockout
(UVLO) threshold, but remains high enough to power
the internal bias supply, the PI33XX will complete the
current cycle and stop switching. If VIN recovers
within 128 switching cycles, the PI33XX will resume
normal operation. If this time limit is exceeded, the
system will enter a low power state and initiate a
fault. The system will restart once the input voltage is
Pulse Skip Mode (PSM)
PI33XX features a PSM to achieve high efficiency at
light loads. The regulators are setup to skip pulses if
EAO falls below a PSM threshold. Depending on
conditions and component values, this may result in
single pulses or several consecutive pulses followed
reestablished and after the Fault Restart Delay.
A
UVLO fault is stored in a Fault Register and can be
read and cleared (PI33XX‐20 and PI33XX‐21 versions
only) via I2C data bus.
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 31 of 39
by skipped pulses. Skipping cycles significantly
reduces gate drive power and improves light load
efficiency. The regulator will leave PSM once the EAO
rises above the Skip Mode threshold.
phase with each other reducing output ripple (refer
to Switching Frequency Synchronization).
To provide synchronization between regulators over
the entire operational frequency range, the Parallel
Good (PGD) pin must be connected to the lead
regulator’s SYNCI pin and a 2.5kΩ Resistor, R1, must
be placed between SYNCO return and the lead
regulator’s SYNCI pin, as shown in Figure 3. In this
configuration, at system soft‐start, the PGD pin pulls
SYNCI low forcing the lead regulator to initialize the
Variable Frequency Operation
Each PI33XX is preprogrammed to a base operating
frequency, with respect to the power stage inductor
(see Table 5), to operate at peak efficiency across line
and load variations. At low line and high load
applications, the base frequency will stretch to
accommodate these extreme operating ranges. By
stretching the frequency, the ZVS operation is
preserved throughout the total input line voltage
range therefore maintaining optimum efficiency.
open‐loop startup synchronization.
regulators reach regulation, SYNCI is released and the
system is now synchronized in closed‐loop
Once the
a
configuration which allows the system to adjust, on
the fly, when any of the individual regulators begin to
enter variable frequency mode in the loop.
Parallel Operation
Paralleling multiple PI33XX modules can be used to
increase the output current capability of a single
power rail and reduce output voltage ripple.
Multi‐phasing three regulators is possible (PI33XX‐20
and PI33XX‐21 only) with no change to the basic
single‐phase design. For more information about
how to program phase delays within the regulator,
please refer to Picor application note PI33XX‐2X
Multi‐Phase Design Procedure.
I2C Busꢀ(PI33XX‐20 and PI33XX‐21 only)
PI33XX‐20 and PI33XX‐21 provide an I2C digital
interface that enables the user to program the EN pin
polarity (from high to low assertion) and switching
frequency synchronization phase/delay. These are
one time programmable options to the device.
Also, the PI33XX‐20 and PI33XX‐21 allow for dynamic
Vout margining via I2C that is useful during
development (settings stored in volatile memory only
and not retained by the device). The PI33XX‐20 and
PI33XX‐21 also have the option for extended fault
telemetry:
Figure 3 ‐ PI33XX parallel operation
By connecting the EAO pins and SGND pins of each
module together the units will share the current
equally. When the TRK pins of each unit are
connected together, the units will track each other
during soft‐start and all unit EN pins have to be
released to allow the units to start (See Figure 3).
Also, any fault event in any regulator will disable the
other regulators. The two regulators will be out of
Fault registry list:
Over temperature protection
Fast/Slow current limit
Output voltage high
Input overvoltage
Input undervoltage
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 32 of 39
For more information about how to utilize the I2C
interface please refer to Picor application note
PI33XX‐2X I2C Interface Guide.
R1, R2, R3 and R4 are all internal 1.0 % resistors and
R_low and R_high are external resistors for which
the designer can add to modify VOUT to a desired
output.
The internal resistor value for each
regulator is listed below in Table 4.
Application Description
Output Voltage Programming
Device
R1
R2
R3
R4
The PI33XX family of Buck Regulators provides six
common output voltages: 1.0V, 2.5V, 3.3V, 5.0V, 12V
and 15V. A post‐package trim step is implemented
to offset any resistor divider network errors ensuring
maximum output accuracy. With a single resistor
connected from the ADJ pin to SGND or REM, each
device’s output can be varied above or below the
nominal set voltage (with the exception of the
PI3311‐X0 which can only be above the set voltage
of 1V).
1k
1.5k
2.61k 1.13k
4.53k 1.13k
11.0k
14.0k
Open
1.0k
0
100
100
100
100
100
100
PI3311‐X0‐LGIZ
PI3312‐X0‐LGIZ
PI3301‐X0‐LGIZ
PI3302‐X0‐LGIZ
PI3303‐X0‐LGIZ
PI3305‐X0‐LGIZ
2.0k
3.0k
3.0k
3.0k
3.0k
1.0k
1.0k
Table 4 ‐ PI33XX Internal divider values
By choosing an output voltage value within the
ranges stated in Table 3, VOUT can simply be
adjusted up or down by selecting the proper R_high
or R_low value, respectively.
equations can be used to calculate R_high and R_low
values:
Output Voltage
Device
The following
Set
Range
PI3311‐X0‐LGIZ
PI3312‐X0‐LGIZ
PI3301‐X0‐LGIZ
PI3302‐X0‐LGIZ
PI3303‐X0‐LGIZ
PI3305‐X0‐LGIZ
1.0V
2.5V
3.3V
5.0V
12V
1.00 to 1.4
2.0 to 3.1
2.3 to 4.1
3.3 to 6.5
6.5 to 13.0
10.0 to 16.0
1
ꢐ
ꢀꢁꢂꢃꢁ
ꢈ
ꢈ
ꢎ ꢀ3ꢄꢄꢓꢔꢕꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ ꢄꢄꢄꢉ1ꢐ
ꢉ
ꢊꢋꢌꢍ ꢎ 1
ꢀ1
1
ꢎ ꢑ
ꢒ
ꢀ2
15V
1
ꢄꢀꢅꢆꢇ
ꢎ ꢀ3.ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ ꢄꢄꢄꢉ2ꢐ
Table 3 ‐ PI33XX family output voltage ranges
1
1
ꢀ1
ꢎ ꢑ
ꢒ
ꢉ
ꢐ
ꢀ2 ꢊꢋꢌꢍ ꢎ 1
The remote pin (REM) should always be connected
to the VOUT pin, if not used, to prevent an output
voltage offset. Figure 4 shows the internal feedback
voltage divider network.
If, for example, a 6.0V output is needed, the user
should choose the proper regulator from Table 3.
For this example, we will select the PI3302 (5.0V)
and use Equation (1) to calculate R_high to increase
the PI3302’s output. From Table 4, the resistor‐
divider network values for the PI3302 are:
R1=4.53Ωk, R2=1.13kΩ, and R3 = 3.0kΩ. Inserting
these values in to Equation (1), R_high is calculated
as follows:
1
1.57ꢏ ꢈ
ꢎ 3.0ꢏ.ꢄ
ꢉ
ꢐ
6.0 ꢎ 1
4.53ꢏ
1
ꢎ ꢑ
ꢒ
1.13ꢏ
Figure 4 ‐ Internal resistor divider network
The value calculated is ideal and may not be
available for purchase; therefore, select a standard
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 33 of 39
1% value close to the value calculated. A 1.56kΩ,
1%, resistor is a standard value. Check your results
by using the voltage divider equation.
Master VOUT
R1
R2
Soft‐Start Adjust and Tracking
PI33XX
TRK
Slave
The TRK pin offers a means to increase the
regulator’s soft‐start time or to track with additional
regulators. The soft‐start slope is controlled by an
internal 100nF and a fixed charge current to provide
a minimum startup time of 2ms (typical) for all
PI33XX regulators. By adding an additional external
capacitor to the TRK pin, the soft‐start time can be
increased further. The following equation can be
used to calculate the proper capacitor for a desired
soft‐start times:
SGND
Figure 6 ‐ Voltage divider connections for direct tracking
All connected regulators’ soft‐start slopes will track
with this method. Direct tracking timing is
demonstrated in Figure 5 (b). All tracking regulators
should have their Enable (EN) pins connected
together to work properly.
ꢚꢛ
ꢉ
ꢐ
Cꢖꢗꢘ ꢈ tꢖꢗꢘ ꢙ Iꢖꢗꢘ ꢎ 100x10
,
Inductor Pairing
Where, tTRK is the soft‐start time and ITRK is a 50uA
internal charge current (see Electrical Characteristics
for limits).
The PI33XX utilizes an external inductor. This
inductor has been optimized for maximum efficiency
performance. Table 5 details the specific inductor
value and part number utilized for each PI33XX
device and are manufactured by Cooper Bussman
Coiltronics.
There is typically either proportional or direct
tracking implemented within
a
design. For
proportional tracking between several regulators at
startup, simply connect all devices TRK pins
together. This type of tracking will force all
connected regulators to startup and reach regulation
at the same time (see Figure 5 (a)).
Inductor
[nH]
120
Inductor
Part Number
TBD‐120‐R
Device
PI3311‐X0‐LGIZ
PI3312‐X0‐LGIZ
PI3301‐X0‐LGIZ
PI3302‐X0‐LGIZ
PI3303‐X0‐LGIZ
PI3305‐X0‐LGIZ
200
FPT705‐200‐R
FPT705‐200‐R
FPT705‐200‐R
FPT705‐230‐R
VOUT 1
VOUT 2
200
200
230
230
FPT705‐230‐R
(a)
Master VOUT
VOUT 2
Table 5 ‐ PI33XX Inductor pairing
(b)
t
Figure 5 ‐ PI33XX tracking methods
For Direct Tracking, choose the regulator with the
highest output voltage as the master and connect
the master to the TRK pin of the other regulators
through a divider (Figure 6) with the same ratio as
the slave’s feedback divider (see Table 4 for values).
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 34 of 39
Input and Output Filter Considerations
start up into a full resistive load and supply the
output capacitive load with the default minimum
soft start capacitor when the input source
impedance is 50 Ohms at 1MHz. The ESR for this
capacitor should be approximately 20mΩ. The RMS
ripple current in this capacitor is small, so it should
not be a concern if the input recommended ceramic
The PI33XX requires input bulk storage capacitance
as well as low impedance ceramic X5R input
capacitors to ensure proper start up and high
frequency decoupling for the power stage. The
PI33XX will draw nearly all of the high frequency
current from the low impedance ceramic capacitors
when the main high side MOSFET is conducting.
During the time the high side MOSFET is off, they are
replenished from the bulk capacitor. If the input
impedance is high at the switching frequency of the
converter, the bulk capacitor must supply all of the
average current into the converter, including
replenishing the ceramic capacitors. This value has
been chosen to be 100µF so that the PI33XX can
capacitors are used. Table
6
shows the
recommended input and output capacitors to be
used for the various models as well as expected
transient response, RMS ripple currents per
capacitor, and input and output ripple voltages.
Table 7 includes the recommended input and output
ceramic capacitors.
Device VIN ILOAD CINPUT
CINPUT
COUTPUT
CINPUT
COUTPUT
Input Output Transient Recovery
Load
Step
(A)
(V) (A)
Bulk
Elec.
Ceramic Ceramic Ripple Ripple Ripple Ripple Deviation
X5R
Time
(µs)
X5R
Current Current (mVpp) (mVpp) (mVpk)
(IRMS
)
(IRMS)
(Slew/µs)
100µF
50V
8X100µF
4X4.7µF 2X1 µF
10
120
100
150
100
200
125
220
140
275
150
280
160
20
15
PI3311 24
5
0.5
0.8
‐/+40
‐/+80
40
25
20
30
30
30
(5A/µs)
5
10
5
50V
1X0.1 µF
4X100µF
2X1 µF
1X0.1 µF
4X100µF
2X1 µF
1X0.1 µF
4X100µF
2X1 µF
1X0.1 µF
4X22µF
2X1 µF
100µF
50V
50
PI3312 24
4X4.7µF
5
1
1.75
1.625
1.5
(10A/µs)
24
10
5
40
PI3301
24
100µF
50V
5
4X4.7µF
4X4.7µF
1.05
1.2
‐/+100
‐/+170
‐/+300
‐/+400
(10A/µs)
33
100µF
50V
10
5
50
PI3302 24
PI3303 24
PI3305 24
5
(5A/µs)
30
100µF
50V
8
100
60
4X4.7µF
4X4.7µF
4
1.3
1.36
1.2
(10A/µs)
4
1X0.1 µF
4X22µF
2X1 µF
100µF
50V
8
150
75
4
1.38
(10A/µs)
4
1X0.1 µF
Table 6 ‐ Recommended input and output capacitance
MURATA PART NUMBER
DESCRIPTION
MURATA PART NUMBER
DESCRIPTION
4.7uF 50V 1206 X7R
GRM188R71C105KA12D
1uF 16V 0603 X7R
GRM31CR71H475KA12K
GRM319R71H104KA01D 0.1uF 50V 1206 X7R
GRM31CR60J107ME39L
GRM31CR61A476ME15L 47uF 10V 1206 X5R
22uF 25V 1206 X5R
100uF 6.3V 1206 X5R GRM31CR61E226KE15L
Table 7 ‐ Capacitor manufacturer part numbers
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 35 of 39
Layout Guidelines
When Q1 is on and Q2 is off, the majority of CIN’s
current is used to satisfy the static output load and
to recharge the COUT capacitors. When Q1 is off
and Q2 is on, the load current is supplied by the
inductor and the COUT capacitor. During this period
CIN is also being recharged by the VIN. Low CIN loop
inductance is important to minimize peak voltage
when Q1 turns off. Also, the difference in area
between the CIN loop and COUT loop is vital to
minimize switching and GND noise.
To optimize maximum efficiency and a low noise
performance from
a
PI33XX design, layout
considerations are necessary. Reducing trace
resistance and minimizing high current loop returns
along with proper component placement will reduce
parasitic resistance and inductance.
A typical buck converter circuit is shown in Figure 9.
The potential areas of high parasitic inductance and
resistance are the circuit return paths, shown as LR
below.
Figure 9 ‐ Typical Buck Converter
Figure 11 ‐ Current flow: Q2 closed
The path between the COUT and CIN capacitors is of
particular importance since the AC currents are
flowing through both of them when Q1 is turned on.
Figure 10, schematically, shows the reduced trace
length between input and output capacitors. The
shorter path lessens the effects that copper trace
parasitics can have on the PI33XX performance.
The recommended component placement, shown in
Figure 11, illustrates the tight path between CIN and
COUT (and VIN and VOUT) for the high AC return
current. This optimized layout is the same that is
used on the PI33XX evaluation board.
Figure 10 ‐ Current flow: Q1 closed
Figure 12 ‐ Recommended component
placement and metal routing
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 36 of 39
Recommended PCB Footprint and Stencil
Figure 13 ‐ Recommended Receiving PCB footprint.
Figure 133 details the recommended receiving footprint for PI33XX 10mm x 14mm package. All pads should have
a final copper size of 0.55mm x 0.55mm, whether they are solder‐mask defined or copper defined, on a 1mm x
1mm grid. All stencil openings are 0.55mm when using a 6mil stencil.
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 37 of 39
Package Drawings
S YMBOL
MIN
2.50
--
NOM
2.56
MAX
2.62
0.05
2.57
0.60
0,60
A
A1
A2
b
--
--
--
0.50
0.50
0.55
L
0.55
D
14.00BSC
10.00BSC
13.00BSC
9.00BSC
1.00BSC
0.15
E
D1
E1
e
L1
aaa
bbb
ccc
ddd
eee
0.10
0.20
0.10
0.10
0.08
0.10
0.08
Picor Corporation • picorpower.com
PI33XX‐X0‐LGIZ Family Datasheet
Rev 1.2 August 24, 2012
Page 38 of 39
Warranty
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its
use. Vicor makes no representations or warranties with respect to the accuracy or completeness of the contents of this
publication. Vicor reserves the right to make changes to any products, specifications, and product descriptions at any time
without notice. Information published by Vicor has been checked and is believed to be accurate at the time it was printed;
however, Vicor assumes no responsibility for inaccuracies. Testing and other quality controls are used to the extent Vicor
deems necessary to support Vicor’s product warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed. Specifications are subject to change without notice.
Vicor’s Standard Terms and Conditions
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Product Warranty
In Vicor’s standard terms and conditions of sale, Vicor warrants that its products are free from non‐conformity to its Standard
Specifications (the “Express Limited Warranty”). This warranty is extended only to the original Buyer for the period expiring two
(2) years after the date of shipment and is not transferable.
UNLESS OTHERWISE EXPRESSLY STATED IN A WRITTEN SALES AGREEMENT SIGNED BY A DULY AUTHORIZED VICOR SIGNATORY,
VICOR DISCLAIMS ALL REPRESENTATIONS, LIABILITIES, AND WARRANTIES OF ANY KIND (WHETHER ARISING BY IMPLICATION OR
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COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT, OR ANY OTHER MATTER.
This warranty does not extend to products subjected to misuse, accident, or improper application, maintenance, or storage.
Vicor shall not be liable for collateral or consequential damage. Vicor disclaims any and all liability arising out of the application
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products that include Vicor components, buyers should provide adequate design, testing and operating safeguards.
Vicor will repair or replace defective products in accordance with its own best judgment. For service under this warranty, the
buyer must contact Vicor to obtain a Return Material Authorization (RMA) number and shipping instructions. Products
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product to the factory. Vicor will pay all reshipment charges if the product was defective within the terms of this warranty.
Life Support Policy
VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR
CORPORATION. As used herein, life support devices or systems are devices which (a) are intended for surgical implant into the
body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use
provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any
component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the
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products and components in life support applications assumes all risks of such use and indemnifies Vicor against all liability and
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Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent applications)
relating to the products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise,
to any intellectual property rights is granted by this document. Interested parties should contact Vicor's Intellectual Property
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Vicor Corporation
25 Frontage Road
Andover, MA 01810
Picor Corporation
51 Industrial Drive
North Smithfield, RI 02896
Customer Service: custserv@vicorpower.com Technical Support: apps@vicorpower.com
Tel: 800‐735‐6200
Page 39 of 39
Picor Corporation • picorpower.com PI33XX‐X0‐LGIZ Family Datasheet Rev 1.2 August 24, 2012
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