SC1565IT-X.X [SEMTECH]
Very Low Dropout 1.5 Amp Regulator With Enable; 非常低的压差1.5 AMP稳压器具有使能
| 型号： | SC1565IT-X.X |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Very Low Dropout 1.5 Amp Regulator With Enable |
| 文件： | 总14页 (文件大小：290K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC1565
Very Low Dropout
1.5 Amp Regulator With Enable
POWER MANAGEMENT
Description
Features
The SC1565 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 1.5 Amps. Since it has
superior dropout characteristics compared to regular
LDOs, it can be used to supply 2.5V on motherboards or
2.8V on peripheral cards from the 3.3V supply thus
allowing the elimination of costly heatsinks. Additionally,
the 5-lead TO-220/TO-263 and SO-8 versions have an
enable pin to further reduce power dissipation while shut
down. The SC1565 provides excellent regulation over
variations in line, load and temperature.
350mV dropout @ 1.5A
Adjustable output from 1.2V to 4.8V(1)
2.5V and 1.8V options (adjustable externally
using resistors)(1)
Over current and over temperature protection
Enable pin(1)
10µA quiescent current in shutdown(1)
Low reverse leakage (output to input)
Surface mount and through-hole packages
Full industrial temperature range
TO-220, TO-263, SOT-223 and SO-8 Packages
Note:
The SC1565 is available in SO-8, 3-lead SOT-223, 3 and
5 lead TO-220 and 3 and 5 lead TO-263 packages. Three
lead packages are available with 1.8V and 2.5V fixed
output options only. The SO-8, TO-220-5 and TO-263-5
are available with 1.8V and 2.5V internally preset
outputs that are also adjustable using external resistors.
(1) SO-8, TO-220-5 and TO-263-5 packages only.
Applications
Battery powered systems
Motherboards
Peripheral cards
Network cards
Set Top Boxes
Medical Equipment
Notebook Computers
Typical Application Circuits
U1
1
2
3
4
8
7
6
5
ENABLE
VIN
EN
VIN
VO
GND
GND
GND
U1
1
2
3
4
8
7
6
5
ENABLE
VIN
EN
VIN
VO
GND
GND
GND
VO
ADJ GND
VO
R1
SC1565IS-X.X
ADJ GND
C1
C2
SC1565IS-X.X
C1
C2
R2
1.200 (R1 + R2)
VO
=
Volts
R2
1.200 (R1 + R2)
VO
=
Volts
VO
U1
SC1565I5T-X.X
R2
2
1
4
5
VIN
VIN
VO
ENABLE
EN
ADJ
GND
3
U1
SC1565IT-X.X
R1
R2
1
3
VIN
VO
VIN
VO
C1
C2
GND
C1
C2
2
Notes:
(1) Maximum VO setpoint for 1.8V parts = 5.4V.
(2) This device is designed to operate with ceramic input and output capacitors.
Revision: April 27, 2005
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SC1565
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
Parameter
Symbol
VIN
Max
Units
V
Input Voltage
7
Power Dissipation
PD
Internally Limited
W
Thermal Resistance Junction to Ambient
SO-8(1)
65
63
50
60
°C/W
°C/W
θJA
SOT-223
TO-220-X
TO-263-X
Thermal Resistance Junction to Case
SO-8
θJC
39
27
3
SOT-223
TO-220-X, TO-263-X
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
TA
TJ
-40 to +85
-40 to +150
-65 to +150
300
°C
°C
°C
°C
kV
TSTG
TLEAD
VESD
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
4
Note: (1) 1 square inch of FR-4, double sided, 1 oz. minimum copper weight.
Electrical Characteristics
Unless specified: V = VIN. Adjustable Option (V > VTH(ADJ)): VIN = 2.2V to 5.5V and IO = 10µA to 1.5A.
Fixed Options (VADJE=N GND): VIN = (VO + 0.7V) toA5DJ.5V and IO = 0A to 1.5A. Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
VIN
Supply Voltage Range
Quiescent Current
VIN
IQ
2.2
5.5
1.75
35
V
VIN = 3.3V
0.75
10
mA
µA
VIN = 5.5V, VEN = 0V
VO
Output Voltage(1)
(Internal Fixed Voltage)
Line Regulation(1)
Load Regulation(1)
Dropout Voltage(1)(2)
VO
VIN = VO + 0.7V, IO = 10mA
-1%
VO
+1%
+2%
0.3
V
-2%
REG(LINE)
REG(LOAD)
VD
VIN = (VO + 0.25V) to 5.5V, IOUT = 10mA
VIN = VO + 0.7V
0.035
0.2
%
%
0.4
IO = 10mA
2.5
10
mV
20
IO = 500mA
90
300
400
mV
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SC1565
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: V = VIN. Adjustable Option (V > VTH(ADJ)): VIN = 2.2V to 5.5V and IO = 10µA to 1.5A.
Fixed Options (VADJE=N GND): VIN = (VO + 0.7V) toA5DJ.5V and IO = 0A to 1.5A. Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
VO (Cont.)
Dropout Voltage(1)(2)
IO = 1A
180
270
400
mV
mV
500
IO = 1.5A
500
600
10
Minimum Load Current(3)
Current Limit
IO
VIN = VO + 0.7V
1
µA
A
ICL
1.6
2.0
3.5
ADJ
Reference Voltage(1)
VREF
VIN = 2.2V, VADJ = VOUT, IO = 10mA
VADJ = VREF
1.188
1.200
1.212
1.224
200
V
1.176
Adjust Pin Current(4)
Adjust Pin Threshold(5)
EN
IADJ
30
nA
V
VTH(ADJ)
0.05
1.6
0.20
0.40
Enable Pin Current
Enable Pin Threshold
IEN
VIH
VIL
VEN = 0V, VIN = 3.3V
VIN = 3.3V
1.5
10
µA
V
VIN = 3.3V
0.4
Over Temperature Protection
High Trip level
THI
THYST
170
20
°C
°C
Hysteresis
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Defined as the input to output differential at which the output voltage drops to 1% below the value
measured at a differential of 0.7V.
(3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this
requirement. Adjustable versions only.
(4) Guaranteed by design.
(5) When VADJ exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from
the error amplifier and connects VADJ instead.
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SC1565
POWER MANAGEMENT
Pin Configurations
Ordering Information
Device
SC1565IS-X.XTR(1)(3)
SC1565IS-X.XTRT(1)(3(6)
SC1565IST-X.XTR(2)(3)
SC1565IST-XXTRT(2)(3)(6)
SC1565IM-X.XTR(2)(4)
SC1565IM-XXTRT(2)(4)(6)
SC1565I5M-X.XTR(1)(4)
SC1565I5MX.XTRT(1)(4)(6)
SC1565IT-X.X(2)(5)
Package
SO-8
SOT-223
TO-263-3
TO-263-5
TO-220-3
TO-220-5
SO-8
SC1565IT-X.XT(2)(5)(6)
SC1565I5T-X.X(1)(5)
SC1565I5T-X.XT(1)(5)(6)
Notes:
SOT-223
(1) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V. Output voltage can be
adjusted using external resistors, see Pin Descriptions
on page 5.
(2) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V. Output not adjustable.
(3) Only available in tape and reel packaging. A reel
contains 2500 devices.
(4) Only available in tape and reel packaging. A reel
contains 800 devices.
(5) Only available in tube packaging. A tube contains 50
devices.
(6) Lead free product. This product is fully WEEE and
RoHS compliant.
TO-220-3
TO-220-5
TO-220-5 and TO-263-5
SOT-223, TO-220-3
and TO-263-3
Pin Configurations (Cont.)
PIN
1
FUNCTION
EN
PIN
1
FUNCTION
VIN
2
VIN
2
GND
3
GND
VO
3
VO
4
TAB is GND
5
ADJ
TAB is GND
TO-263-5
TO-263-3
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SC1565
POWER MANAGEMENT
Block Diagram
*
*
* Not present on SOT-223, TO-220-3 or TO-263-3
Pin Descriptions
Pin Name Pin Desciption
ADJ
This pin, when grounded, sets the output voltage to that set by the internal feedback resistors. If external
feedback resistors are used, the output voltage will be (See Application Circuits on page 1):
1.200 (R1 + R2)
VO
=
Volts
R2
EN
GND
VIN
Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a fraction of
its operating value. The device will be enabled if this pin is left open. Connect to VIN if not being used.
Reference ground. Use all four pins on the SO-8 device for heatsinking. Use the tab on the SOT-223, TO-220
and TO-263 devices for heatsinking.
Input voltage. For regulation at full load, the input to this pin must be between (VO + 0.7V) and 5.5V. Minimum
VIN = 2.2V.
VO
The pin is the power output of the device.
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SC1565
POWER MANAGEMENT
Typical Characteristics
Dropout Voltage (IOUT = 1.5A) vs. Output
Voltage vs. Junction Temperature
Dropout Voltage (IOUT = 1A) vs. Output
Voltage vs. Junction Temperature
600
550
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
Top to bottom:
TJ = 150°C
TJ = 25°C
TJ = -40°C
TJ = 150°C
TJ = 25°C
TJ = -40°C
0
0
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
VOUT (V)
VOUT (V)
Dropout Voltage (IOUT = 0.5A) vs. Output
Voltage vs. Junction Temperature
Output Voltage (2.5V) vs. Junction
Temperature vs. Output Current
400
2.550
2.540
2.530
2.520
2.510
2.500
2.490
2.480
2.470
2.460
2.450
VIN = 3.2V
Top to bottom:
TJ = 150°C
TJ = 25°C
TJ = -40°C
350
300
250
200
150
100
50
I
O = 10mA
O = 1.5A
I
0
-50
-25
0
25
50
75
100
125
150
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
TJ (°C)
VOUT (V)
Output Voltage (2.5V) vs. Junction
Temperature vs. Output Current
Reference Voltage vs. Junction
Temperature vs. Output Current
2.550
2.540
2.530
2.520
2.510
2.500
2.490
2.480
2.470
2.460
2.450
1.225
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
1.175
VIN = 5.5V
VIN = 2.2V
IO = 10mA
IO = 1.5A
I
O = 10mA
IO = 1.5A
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
TJ (°C)
TJ (°C)
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SC1565
POWER MANAGEMENT
Typical Characteristics (Cont.)
Reference Voltage vs. Junction
Temperature vs. Output Current
Quiescent Current vs.
Junction Temperature
1.225
600
590
580
570
560
550
540
530
520
510
500
VIN = 5.5V
1.220
VIN = 3.3V
1.215
1.210
IO = 10mA
1.205
1.200
1.195
1.190
1.185
1.180
1.175
IO = 1.5A
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
TJ (°C)
TJ (°C)
Off-State Quiescent Current vs.
Junction Temperature
10
VIN = 5.5V
9
8
7
6
5
4
3
2
1
0
-50
-25
0
25
50
75
100
125
150
TJ (°C)
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SC1565
POWER MANAGEMENT
Applications Information
Introduction
Thermal Considerations
The power dissipation in the SC1565 is approximately
equal to the product of the output current and the input
to output voltage differential:
The SC1565 is intended for applications such as
graphics cards where high current capability and very low
dropout voltage are required. It provides a very simple,
low cost solution that uses very little pcb real estate.
Additional features include an enable pin to allow for a
very low power consumption standby mode, and a fully
adjustable output.
PD
≈
(VIN − VOUT )• IO
The absolute worst-case dissipation is given by:
Component Selection
PD(MAX
=
(
VIN (MAX − VOUT
)
• IO(MAX + VIN (MAX • IQ (MAX
(MIN ) ) ) )
)
)
Input capacitor: a 4.7µF ceramic capacitor is
recommended. This allows for the device being some
distance from any bulk capacitance on the rail.
Additionally, input droop due to load transients is reduced,
improving load transient response. Additional capacitance
may be added if required by the application.
For a typical scenario, VIN = 3.3V ± 5%, VOUT = 2.8V and
IO = 1.5A, therefore:
VIN(MAX) = 3.465V, VOUT(MIN) = 2.744V and IQ(MAX) = 1.75mA,
Thus PD(MAX) = 1.09W.
Output capacitor: a minimum bulk capacitance of 2.2µF,
along with a 0.1µF ceramic decoupling capacitor is
recommended. Increasing the bulk capacitance will
improve the overall transient response. The use of
multiple lower value ceramic capacitors in parallel to
achieve the desired bulk capacitance will not cause
stability issues. Although designed for use with ceramic
output capacitors, the SC1565 is extremely tolerant of
output capacitor ESR values and thus will also work
comfortably with tantalum output capacitors. For refer-
ence, the phase-margin contour of Figure 1 can be used
to choose an appropriate output capacitor for a given
stability requirement.
Using this figure, and assuming TA(MAX) = 70°C, we can
calculate the maximum thermal impedance allowable to
maintain TJ ≤ 150°C:
T
− TA(MAX )
PD(MAX )
(
)
(
)
150 − 70
1.09
J(MAX )
RTH(J− A)(MAX )
=
=
= 73.4° C / W
This should be achievable for the SO-8 package using
pcb copper area to aid in conducting the heat away, such
as one square inch of copper connected to the ground
pins of the device. The SOT-223, TO-220 and TO-263
packages would not require heatsinking. Internal ground/
power planes and air flow will also assist in removing
heat. For higher ambient temperatures it may be neces-
sary to use additional copper area.
Noise immunity: in very electrically noisy environments,
it is recommended that 0.1µF ceramic capacitors be
placed from IN to GND and OUT to GND as close to the
device pins as possible.
External voltage selection resistors: the use of 1%
resistors, and designing for a current flow ≥ 10µA is
recommended to ensure a well regulated output (thus
R2 ≤ 120kΩ).
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SC1565
POWER MANAGEMENT
Applications Information (Cont.)
Co=22uF, Stable Region:
Unstable Region:
Co=2.2uF, Stable Region:
Unstable Region:
1.5mA
1.5mA
15mA
150mA
1.5A
15mA
Load
Load
150mA
1.5A
10
0.001
0.01
0.1
1
0.001
0.01
0.1
1
10
ESR(Ohms)
ESR(Ohms)
Co=220uF, Stable Region:
Unstable Region:
1.5mA
15mA
Load
150mA
1.5A
0.001
0.01
0.1
1
10
ESR(Ohms)
Figure 1: Phase-margin Contour Plot
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SC1565
POWER MANAGEMENT
Outline Drawing - SO-8
DIMENSIONS
INCHES MILLIMETERS
A
DIM
A
MIN NOM MAX MIN NOM MAX
D
E
e
-
-
-
-
-
-
-
-
-
-
.053
.069 1.35
.010 0.10
.065 1.25
.020 0.31
.010 0.17
1.75
0.25
1.65
0.51
0.25
N
A1 .004
A2 .049
b
.012
.007
2X E/2
c
D
.189 .193 .197 4.80 4.90 5.00
E1
E1 .150 .154 .157 3.80 3.90 4.00
E
e
.236 BSC
.050 BSC
6.00 BSC
1.27 BSC
1
2
-
-
h
L
.010
.020 0.25
0.50
ccc
C
.016 .028 .041 0.40 0.72 1.04
2X N/2 TIPS
(.041)
8
-
(1.04)
8
-
e/2
L1
N
B
01
aaa
0°
8°
0°
8°
.004
.010
.008
0.10
0.25
0.20
bbb
ccc
D
aaa C
h
A2
A
SEATING
PLANE
h
C
A1
H
bxN
bbb
C
A-B D
c
GAGE
PLANE
0.25
L
(L1)
01
SEE DETAIL A
DETAIL A
SIDE VIEW
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MS-012, VARIATION AA.
Land Pattern - SO-8
X
DIMENSIONS
DIM
INCHES
MILLIMETERS
(.205)
.118
.050
.024
.087
.291
(5.20)
3.00
1.27
0.60
2.20
7.40
C
G
P
X
Y
Z
(C)
G
Y
Z
P
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
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SC1565
POWER MANAGEMENT
Outline Drawing - SOT-223
Land Pattern - SOT-223
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SC1565
POWER MANAGEMENT
Outline Drawing - T0-263-3
Minimum Land Pattern - TO-263-3
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SC1565
POWER MANAGEMENT
Outline Drawing - TO-263-5
Minimum Land Pattern - TO-263-5
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SC1565
POWER MANAGEMENT
Outline Drawing - TO-220-3
Outline Drawing - TO-220-5
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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