AT1397A [AIMTRON]
6-Channel DC-DC Converter for DSC; 6通道DC-DC转换器,用于DSC型号: | AT1397A |
厂家: | AIMTRON TECHNOLOGY |
描述: | 6-Channel DC-DC Converter for DSC |
文件: | 总21页 (文件大小:685K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Features
General Description
• 95% Efficient possible DC/DC Converter
• Bulit-in LED Driver and Open LED
Overvoltage Protection
The AT1397A/B provide a complete power
supply solution for digital cameras. They improve
performance, component count, and size compared
to other multi-channel controllers in 1-cell Li-Ion
designs. On-chip MOSFETs provide up to 92~95%
efficiency for critical power supplies, while
additional channels operate with external FETs for
optimum design flexibility. All channels DC/DC
operate at one fixed frequency settable from
100KHz to 1MHz to optimize size, cost, and
efficiency.
• Transformerless Inverting Controller for CCD
Bias
• 2 Channel Built-in MOSFET Current- Mode
PWM and 4 Channel Extra PWM Controllers
(CH-3 Synchronous Output)
• Up to 1MHz Operating Frequency
• Shutdown Current <1uA
• Built-in Soft-Start Function
Built-in Short-Circuit Protection Function
• QFN48 Package
Applications
• DSC Power Supply
Pin Assignment
AT1397AN
AT1397BN
36
35
34
33
32
31
30
29
28
27
26
25
CH1
CH1
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
37
38
39
40
41
42
43
44
45
46
47
48
24
23
22
21
20
19
18
17
16
15
14
13
CH2
CH2
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
AT1397
CH3
CH3
Synchronous Rectified
Voltage Mode Step-Down
Synchronous Rectified
Voltage Mode Step-Down
CH4
CH4
Seletable Voltage Mode
Step-Up/Down/Inverting
Seletable Voltage Mode
Step-Up/Down/Inverting
CH5
CH5
Voltage Mode PWM
Step-Up
Voltage Mode PWM
LED Driver
CH6
CH6
1
2
3
4
5
6
7
8
9
10
11
12
Voltage Mode Step-Up
Voltage Mode Step-Up
Ordering Information
Part Number
Package
QFN48,Green
B:1397BN
Marking
AT1397 N
A:1397AN
:
: Date Code
*For more marking information, contact our sales representative directly.
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1/10/2006
REV:1.0
1
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Block Diagram
COMP1
FB1
-
PVCC1
Step-
-
Down
Pre-
0.8V
+
-
+
Driver
SS1
LX1
SS1OK
Ramp1
CTL1
Current
PGND1
Sense
COMP2
FB2
SS1OK
-
PVCC2
Step-
-
Down
Pre-
+
-
0.8V
+
Driver
SS2
LX2
Power
Good
/SDOK
CTL2
Ramp2
Current
PGND2
Sense
PVCC3
COMP3
FB3
SS1OK
+
-
OUT3S
Step-
Down
Pre-
+
+
-
0.8V
Driver
SS3
OUT3M
PGND3
OSC1
CTL3
SEL4
COMP4
IN4
SS1OK
PVCC4
Step-
Up/
-
+
+
-
IP4
OUT4
+
Down
Pre-
SS4
Driver
*Selectable P-ch or N-ch
driver for step-down/up/
inverting converter
CTL4
OSC2
FB5H
COMP5
FB5
+
OVP
-
1V
SS1OK
-
Step-
Up
+
+
-
+
OUT5
OUT6
Pre-
VREF
Driver
SS5
CTL5
*Metal Option
LED Driver (VREF=0.2V)
or Step-Up(VREF=0.8V)
OSC1
OSC2
COMP6
FB6
SS1OK
-
Step-
Up
0.8V
+
+
-
+
Pre-
Driver
SS6
CTL6
SCP3 SCP4 SCP5 SCP6 OVP
OSC1 OSC2
Ramp1 Ramp2
Ramp
Gen
Short-Circuit
Protection
OSC
CT
CSCP
VCC
0.8V
CTLU
UVLO
2V
1.22V
LDO
VBGEN
VRGEN
2.3V
GND
VBG
VREG
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Pin Description
Symbol
Pin No.
Descript
SS1
CTL5
CTL6
LX1
CTL1
PGND1
PGND2
CTL2
LX2
CTL3
CTL4
SS2
1
CH1 Soft-Start Input
2
CH5 Enable Input
3
CH6 Enable Input
4
CH1 Converter Switching Node
CH1 Enable and Chip Enable Input
Power Ground
5
6
7
Power Ground
CH2 Enable Input
8
9
CH2 Converter Switching Node
CH3 Enable Input
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CH4 Enable Input
CH2 Soft-Start Input
/SDOK
CSCP
PVCC2
COMP2
FB2
Open-Drain, Active Low, Power Good for CH2
Short Circuit Protection Input
CH2 Converter Input
CH2 Controller Compensation Node
CH2 Converter Feedback Input
CH3 Soft-Start Input
SS3
COMP3
FB3
CH3 Compensation Node
CH3 Feedback Input
CH4 Soft-Start Input
SS4
COMP4
IN4
CH4 Compensation Node
CH4 Negative Feedback Input
CH4 Positive Feedback Input
CH3 Power Input
CH3 Master Output Driver
CH3 Slave Output Driver
Power Ground
IP4
PVCC3
OUT3M
OUT3S
PGND3
OUT4
OUT5
OUT6
PVCC4
GND
CH4 Output Driver
CH5 Output Driver
CH6 Output Driver
CH4, CH5 and CH6 Power Input
Power Ground
CH5 Controller Over Voltage Protection Input
CH5 Controller Voltage Feedback/Current Feedback
CH5 Compensation Node
Reference Bypass
FB5H
FB5
COMP5
VBG
SS5
FB6
CH5 Soft-Start Input
CH6 Feedback Input
COMP6
CT
CH6 Compensation Node
Oscillator Control
VREG
FB1
Reference Output
CH1 Converter Feedback Input
CH1 Controller Compensation Node
IC Power Input
COMP1
VCC
PVCC1
SS6
CH1 Converter Input
CH6 Soft-Start Input
SEL4
Configures the CH4 as a Step-Up or Step-Down
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Absolute Maximum Ratings*1
Rated Value
Min. Max.
Parameter
Symbol
Units
Storage Temperature
TSTG
TOPR
-55
-35
-0.3
-0.3
-0.3
-
150
85
℃
℃
V
Operating Temperature TA
PVCC1,PVCC2,PVCC3,PVCC4 Input Voltage
LX1,LX2, OUT3M,OUT3S Input Voltage
Other Input Pin
6.0
6.0
6.0
2.25
200
2
-
VLX/OUT
V
-
-
V
LX1, LX2 Current
A
OUT3M,OUT3S Current
-
-
mA
KV
V
HBM
MM
Pd
-
ESD Susceptibility*2
-
200
1000
Power Consumption
-
mW
1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device reliability.
2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF
capacitor discharged through a 1.5KΩ resistor into each pin.
Recommended Operating Conditions
(Ta=+250C)
Value
Typ
Parameter
Symbol
Unit
Min
2.5
2.5
0
Max
5.5
Startup power supply voltage
Power supply voltage
Vcc
PVCC
VIN
--
V
V
--
5.5
Feedback input voltage
Control input voltage
--
Vcc-2
Vcc
1.0
V
VCTL
CSS
0
--
V
Soft start capacitor
--
0.1
0.1
0.1
25
µF
µF
µF
℃
Short Circuit Protection Capacitor
VREG pin capacitor
CSCP
CVREG
--
1.0
0.082
-20
--
T
Operating ambient temperature*
85
A
*Using X5R or X7R input capacitors.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
4
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Electrical Characteristics
(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V, Ta=+250C)
Values
Parameter
GENERAL
Symbol
Condition
Unit
Min. Typ. Max.
Input Voltage Range
VCC IC Power Input
2.5
2.35
-
-
5.5
2.45
-
V
V
VCC Under Voltage Lockout
UVLO Hysteresis
VUV
VHY
-
2.4
100
-
mV
No Switching,
CH1,CH2 Switch- Off Input
Current
FB1=FB2=0.9V
CTL1=CTL2=3.6V, other
disable
IIN1
-
1.1
1.2
mA
No Switching,
CH1,CH2, CH3(or 4,5,6)
Switch- Off Input Current
FB1=FB2=FB3=0.9V
CTL1=CTL2=CTL3=3.6V,
other disable
IIN2
-
-
1.3
1
1.4
10
mA
µA
All CTL disable,
VCC=3.6V
Shutdown Current
ICC
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference Line Regulation
VREG IREG =1mA
2.25 2.30 2.35
V
1mA< IREG <5mA
-
-
5
-
10
5
mV
mV
∆VREG1
∆VREG2
2.5<VCC<5.5V
OSC
Frequency
fOSC CT=82pF
-
-
-
500
1
-
10
5
KHz
%
Frequency variation with
Temperature
Frequency variation with
Input Voltage
T =-20°C ~+85°C
∆fOSC1
∆fOSC2
a
VCC =2.5V~5.5V
1
%
CHANNEL 1, 2
PVCC1/2
Input Voltage Range
-
2.5
0.7
-
5.5
1.3
V
µA
V
Normal Operating Soft-Start
Charge Current
ISS1/2 VCC =2.5V~5.5V
T =-20°C ~+85°C
1
FB Regulation Voltage
VFB1/2
0.784 0.8 0.816
a
FB input Current
IFB1/2 FB1/2=0.8V
RCS
-
-
-
-
-
100
nA
V/A
µs
Current-Sense Amplifier
Transresistance
-
-
0.6
120
100
-
-
-
Transconductance
GMEA
Maximum Duty Cycle
DMAX FB1/2=0.7V
%
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
V
=0~3.6V
LX Leakage Current
Switch On-Resistance
ILX1/2
RN
-
-
1
5
250
300
1.4
-
µA
mΩ
mΩ
A
LX1/2
N-Channel
P-Channel
200
250
1.2
20
RP
-
P-Channel Current Limit
N-Channel Turn-off Current
/SDOK Output Low Voltage
/SDOK Leakage current
ILimit2
IREV2
-
-
1.0
-
mA
V
VSDOK 0.1mA into /SDOK
-
0.01
0.1
0.1
1
IL_SDOK CTL2=0V, /SDOK=5.5V
-
µA
CHANNEL 3
PVCC3
ISS3
Input Voltage Range
-
VCC =2.5V~5.5V
FB3=0.8V
2.5
0.7
-
-
1
-
5.5
1.3
100
V
Normal Operating Soft-Start
Charge Current
µA
nA
FB3 input Current
IFB3
T =-20°C ~+85°C,
FB3=COMP3
DC
a
FB3 Regulation Voltage
Error Amplifier Voltage Gain
VFB3
AV
0.784 0.8 0.816
V
80
-
-
5
-
-
dB
MHz
V
Error Amplifier Frequency
Bandwidth
BW AV=0dB
V
-
-
-
1.0
10
-
OH
Error Amplifier Output
Voltage
V
-
-
mV
mA
µA
%
OL
I
COMP=0.8V
COMP=0.8V
-
1
-
source
Error Amplifier Output
Source/Sink Current
I
-
60
-
sink
Maximum Duty Cycle
DMAX FB3=0.7V
-
100
-130
100
18
-
DUTY=90%,OUT=1/2VC
C
I
-
-80
-
mA
mA
Ω
source
Output Source/Sink Current
I
DUTY=0%,OUT=1/2VCC
65
-
sink
R
OH
OUT=-15mA
30
25
Output On-Resistor
R
OL
OUT=15mA
-
16
Ω
CHANNEL 4, 5, 6
Input Voltage Range
PVCC4 CH4, 5, 6
2.5
0.7
-
5.5
1.3
V
µA
V
Normal Operating Soft-Start
Charge Current
ISS4/5/6 VCC =2.5V~5.5V
1
T =-20°C ~+85°C,
a
FB4/5/6 Regulation Voltage
VFB4/5/6
0.784 0.8 0.816
0.19 0.20 0.21
FB_=COMP_
T =-20°C ~+85°C,
FB5 Regulation Voltage for
LED Driver
a
VFB5
V
FB5=COMP5
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
T =-20°C ~+85°C,
FB5H OVP Trip Level
VFB5H
AV
0.98 1.00 1.02
V
dB
MHz
V
a
Error Amplifier Voltage Gain
DC
80
-
-
5
-
-
Error Amplifier Frequency
Bandwidth
BW AV=0dB
V
-
-
-
1.0
10
1
-
OH
Error Amplifier Output
Voltage
V
-
-
mV
mA
µA
%
OL
I
COMP=0.8V
COMP=0.8V
-
-
source
Error Amplifier Output
Source/Sink Current
I
-
60
90
90
-130
100
18
16
-
sink
DMAX FB_=0.7V
DMAX FB5=0.1V
85
85
-
95
95
-80
-
Maximum Duty Cycle
Output Source/Sink Current
Output On-Resistor
%
DUTY=90%,OUT=1/2VC
C
I
mA
mA
Ω
source
I
DUTY=0%,OUT=1/2VCC
65
-
sink
R
OH
OUT=-15mA
30
25
R
OL
OUT=15mA
-
Ω
SHORT CIRCUIT PROTECTION
V
V
Threshold Voltage
CH3,CH4,CH5,CH6
CH3,CH4,CH5,CH6
CH3,CH4,CH5,CH6
-
-
0.9
0.7
1
-
-
V
V
TH
TH
VCSCP Detect Voltage
CSCP Charge Current
I
0.7
1.3
µA
CSCP
CONTROL BLOCK
CTL Input Voltage
CTL Hysteresis
V
Active Mode
1.5
0
-
-
VCC
0.5
-
V
V
IH
V
Standby Mode
IL
△VH
-
Step-Up Type
Step-Down Type
-
-
100
-
mV
V
V
1.5
0
VCC
0.5
-
IH
SEL4 Input Voltage
SEL4 Hysteresis
V
-
V
IL
△VH
-
100
mV
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics
CH1,2 Efficiency VS. Load Current
CH1,2 Efficiency VS. Load Current
100
100
90
80
70
60
50
90
80
70
VBAT=4.2V
VBAT=3.8V
VBAT=3.6V
VBAT=3.3V
VBAT=3.0V
VBAT=2.5V
VBAT=4.2V
VBAT=3.8V
VBAT=3.6V
60
Vout =1.8V
Vout =3.3V
50
10
100
1000
10
100
1000
Load Current(mA)
Load Current(mA)
CH3 Efficiency VS. Load Current
CH4,5,6 Efficiency VS. Load Current
100
90
80
70
60
50
100
90
80
70
60
50
VBAT=4.2V
VBAT=4.2V
VBAT=3.8V
VBAT=3.6V
VBAT=3.3V
VBAT=3.0V
VBAT=2.5V
VBAT=3.8V
VBAT=3.6V
VBAT=3.3V
Vout =3.0V
Vout =5.0V
10
100
1000
10
100
1000
Load Current(mA)
Load Current(mA)
CH4,5,6 Efficiency VS. Load Current
CH4 Efficiency VS. Load Current
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VBAT=4.2V
VBAT=4.2V
VBAT=3.8V
VBAT=3.6V
VBAT=3.3V
VBAT=3.0V
VBAT=2.5V
VBAT=3.8V
VBAT=3.6V
VBAT=3.3V
VBAT=3.0V
VBAT=2.5V
Vout=15V
Vout =-7.5V
1
10
100
1
10
100
Load Current(mA)
Load Current(mA)
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics (Continued )
Efficiency VS. Input Voltage
100
No-Load Input Current VS. Input Voltage
1.6
Vout1,2=3.3V
Iout1,2=300mA
1.4
1.2
95
Vout1,2=1.8V
Iout1,2=300mA
Vout3=3.0V
Iout3=300mA
90
85
80
1.0
CH1
CH1+CH2
0.8
Vout4=5.0V
Iout4=50mA
0.6
2.5
3.0
3.5
4.0
4.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
100
100
Input Voltage-VIN (V)
Input Voltage-VIN (V)
Switching Frequency VS. Temperature
Reference Voltage VS. Temperature
520
510
500
490
480
470
460
2.305
2.300
2.295
2.290
2.285
2.280
2.275
-20
0
20
40
60
80
100
-20
0
20
40
60
80
Temperature
Temperature
Maximum Duty VS. Temperature
FB Regulation Voltage VS. Temperature
0.805
0.800
0.795
0.790
0.785
96
95
94
93
92
91
90
89
88
87
P-MOS
N-MOS
-20
0
20
40
60
80
100
-20
0
20
40
60
80
Temperature
Temperature
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics (Continued )
VBAT=3.8V
VBAT=3.8V
CH1:CTL1, CH2:VOUT1
CH3:IOUT1, CH4:Iin
CH1:CTL2, CH2:VOUT2
CH3:IOUT2, CH4:Iin
VBAT=4.2V
VBAT=3.8V
CH1:CTL, CH2:VOUT1
CH3:VOUT2, CH4:VOUT3
CH2:VOUT1, CH3:IOUT1
VBAT=3.8V
VBAT=3.8V
CH2:VOUT2, CH3:IOUT2
CH2:VOUT3, CH3:IOUT3
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Application Circuits
VBAT
1-Cell Li-Ion
3.4V~4.2V
LED+
2~4Cell
20mA
10uH
10uH
10uF
10uF
CCD Bias
PVCC4
OUT6
MBR140WS
1uF
PVCC4
OUT5
MBR140WS
+12V/50mA
CH5
Voltage-Mode
PWM LED
Driver
UPM2031AN
UPM2031AN
CH6
Voltage-Mode
Step-Up PWM
10uF
150K
10K
140K
FB6
FB5H
10K
0.1uF
10K
COMP6
0.1uF
1K
SS6
COMP5
FB5
LED-
0.1uF
1uF
0.22uF
PVCC3
PVCC3
SS5
10K
10R
VBAT
SEL4
10uF
OUT3M
UPM2032BN
10uH
VBAT
PVCC4
PVCC4
VLENS
CH3
+3V/300mA
Voltage-Mode
Synchronous
Step-Down
10uF
1uF
OUT3S
22uF
UPM2032BN
CCD Bias
OUT4
CH4
-6V3/50mA
MBR140WS
Voltage-Mode
Inverting PWM
MBR140WS
UPM2031AN
275K
PGND3
FB3
10uF
/6V3
0.22uF
64.9K
10uH
SS4
COMP4
IN4
0.1uF
10K
COMP3
SS3
100K
10K
0.1uF
0.1uF
10K
PVCC1
IP4
VBAT
VREG
10uF
1uF
10K
CH1
VDSP_Core
+1V8/200mA
Current-Mode
Synchronous
Step-Down
PWM
LX1
AT1397A
0.1uF
6.8uH
10K
VBG
22uF
PGND1
MBR140WS
125K
100K
1500pF
51K
COMP1
FB1
SS1
0.47uF
33pF
CSCP
CT
Short-Circuit
Protection
0.1uF
10uF
PVCC2
82pF
51K
VBAT
1500pF
COMP2
/SDOK
CH2
VDSP_IO
Current-Mode
Synchronous
Step-Down
PWM
+3V3/200mA
LX2
6.8uH
33pF
22uF
PGND2
MBR140WS
312.5K
Power ON
CTL1
CTL2
CTL3
CTL4
CTL5
CTL6
100K
FB2
SS2
LENS ON
CCD ON
LED ON
0.1uF
1uF
VCC
GND
VBAT
1-Li Battery Application 1
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Application Circuits ( Continued )
VBAT
1-Cell Li-Ion
3.4V~4.2V
10uH
10uH
10uF
10uF
CCD Bias
PVCC4
OUT6
MBR140WS
10uF
PVCC4
OUT5
MBR140WS
+12V/50mA
LCD
UPM2031AN
UPM2031AN
+12V/50mA
CH5
CH6
Voltage-Mode
Step-Up PWM
Voltage-Mode
Step-Up PWM
10uF
140K
FB6
FB5H
10K
0.1uF
10K
COMP6
0.1uF
1K
COMP5
FB5
140K
10K
SS6
0.1uF
1uF
0.1uF
SS5
PVCC3
PVCC3
VBAT
SEL4
10uF
OUT3M
UPM2032BN
10uH
VBAT
PVCC4
PVCC4
VLENS
CH3
+3V/300mA
Voltage-Mode
Synchronous
Step-Down
10uF
1uF
OUT3S
22uF
UPM2032BN
CCD Bias
OUT4
CH4
-6V3/50mA
MBR140WS
Voltage-Mode
Inverting PWM
MBR140WS
UPM2031AN
275K
PGND3
FB3
10uF
/6V3
0.22uF
64.9K
10uH
SS4
COMP4
IN4
0.1uF
10K
COMP3
SS3
100K
10K
0.1uF
0.1uF
10K
PVCC1
IP4
VBAT
VREG
10uF
1uF
CH1
VDSP_Core
+1V8/200mA
10K
Current-Mode
Synchronous
Step-Down
PWM
LX1
AT1397B
0.1uF
6.8uH
10K
VBG
22uF
PGND1
MBR140WS
125K
100K
1500pF
51K
COMP1
FB1
SS1
0.47uF
33pF
CSCP
CT
Short-Circuit
Protection
0.1uF
10uF
PVCC2
82pF
51K
VBAT
1500pF
COMP2
/SDOK
CH2
VDSP_IO
Current-Mode
Synchronous
Step-Down
PWM
+3V3/200mA
LX2
6.8uH
33pF
22uF
PGND2
MBR140WS
312.5K
Power ON
CTL1
CTL2
CTL3
CTL4
CTL5
CTL6
100K
FB2
SS2
LENS ON
CCD ON
LED ON
0.1uF
1uF
VCC
GND
VBAT
1- Li Battery Application 2
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Application Information
The AT1397A/B includ 6 channels DC/DC to generate a multiple-output digital
camera power-supply system. It include :
z
z
z
z
z
Step-Down DC/DC converter with on-chip synchronous MOSFETs.(CH1, CH2)
Main synchronous DC/DC controller for Step-Down converter.(CH3)
Selectable DC/DC controller for boost/flyback/buck/inverting converters.(CH4)
White LED driver with open LED protection or boost controller.(CH5)
Boost/flyback controller.(CH6)
Step-Down DC/DC Converter (CH1, CH2)
The step-down DC/DC is optimized for generating DSP voltage (down to 0.8V) at
high efficiency. It runs from the voltage at PVCC1/PVCC2. This pin can be connected
directly to the battery if sufficient headroom exists to avoid dropout.
The CH2 also features an open-drain /SDOK output that goes low when the CH2 is in
regulation. /SDOK may be used to drive an external P-MOSFET that gates 3V power
to the LENs after the DSP_IO voltage is in regulation (Figure 1). The R1,R2 and C1
is for MOSFET soft-start function to avoid the more inrush current .
Step-Down DC/DC Converter (CH3)
The CH3 is step-down voltage mode PWM converter. An external MOSFET and
synchronous rectifier allow conversion efficiencies as high as 93%. Step-down
operation can be direct from Li-Ion cell if the minimum input voltage exceeds the
desired output by approximately 200mV.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1/10/2006
REV:1.0
13
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
PVCC3
OUT3M
OUT3S
VBAT
VBG
VLENS
+3V
CH3
VBAT
Voltage-Mode
Synchronous
Step-Down
VCC
GND
C1
R1
PGND3
FB3
R2
COMP3
SS3
PVCC1
VBAT
COMP1
CH1
LX1
VDSP_Core
+1V8
Current-Mode
Synchronous
Step-Down
PWM
PGND1
FB1
SS1
PVCC2
VBAT
CH2
VDSP_IO
+3V3
Current-Mode
Synchronous
Step-Down
PWM
LX2
COMP2
PGND2
FB2
SS2
/SDOK
Figure 1. Using /SDOK to drive external P-MOSFET that gates 3V power to LENs after 3.3V I/O voltage is in regulation
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1/10/2006
REV:1.0
14
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Auxiliary Controller (CH4, CH5, CH6)
The three auxiliary controllers operate as fixed-frequency voltage-mode PWM
controllers. They use the external MOSFETs, so output power is determined by
external components. All of auxiliary controllers have a guaranteed duty cycle of
maximum duty cycle of 85% (boost-type) or 100%(buck/inverting type). In boost
designs that employ continuous current (CCM), the maximum duty cycle limits the
boost ratio so:
VIN
VOUT
1−
≤ 85%
With discontinuous inductor current (DCM), no such limit exists for the input/output
ratio since the inductor has time to fully discharge before the next cycle begins. The
discontinuous conduction mode boost voltage conversion relationship is given by:
4 × D2
1+ 1+
K
D = K × M × (M − 1)
VO = Vi ×
2
Where K is defined as:
VO
M =
Vi
2 × L
K =
R ×TS
The CH4 is selectable DC/DC controller for drive N-channel MOSFETs (SEL=high)
or P-channel MOSFETs (SEL=low). It can be configure as the inverting circuit
(Figure 2), typically for CCD and LCD bias. This is useful in height-limited designs
where transformers may not be desired. The efficiency is more than the charge-pump
inversion for some load conditions.
The CH5 can be configure as a switching-mode boost current source for white LEDs,
FB5 (0.2V) provides current-sensing feedback, while FB5H (1.0V) provides (optional)
open-LED over-voltage protection (Figure 3). If used as a boost converter, FB5H is
grounded and FB5 (0.8V) is used as the feedback input. In this case, CH5 behaves
exactly like CH4 and CH6.
The CH6 can be used for conventional DC/DC boost and flyback designs.(Figure
4 ,Figure 5 and Figure 6)
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1/10/2006
REV:1.0
15
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
VBAT
SEL4
PVCC4
-7.5V
CCD Bias
OUT4
CH4
Voltage-Mode
Inverting PWM
SS4
COMP4
IN4
IP4
VREG
Figure 2. Regulated –7.5V negative CCD Bias.
VBAT
LED+
2~4Cell
20mA
PVCC4
OUT5
CH5
Voltage-Mode
PWM LED Driver
FB5H
COMP5
LED-
FB5
SS5
Figure 3. LED Drive with open LED over-voltage protection
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
16
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
VBAT
-7.5V
15V
PVCC4
OUT6
CH6
Voltage-Mode
Step-Up PWM
FB6
COMP6
SS6
Figure 4. +15V and –7.5V CCD Bias with transformer
VBAT
-7.5V
PVCC4
OUT6
15V
CH6
Voltage-Mode
Step-Up PWM
FB6
COMP6
SS6
Figure 5. +15V and –7.5V CCD Bias with Charge-Pump Inversion
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
17
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
VBAT
15V
PVCC4
CH6
OUT6
Voltage-Mode
Step-Up PWM
FB6
COMP6
SS6
IN
/SHDN GND
FB
OUT
+
-
1.24V
AT1202
Figure 6. +15V and –7.5V CCD Bias with Charge-Pump (using AT1202 to regulated the negative output)
Soft-Start Setting (CH1~CH6)
The AT1397A/B all channels feature a soft-start function that limits inrush current and
prevents excessive battery loading at start-up by ramping the output voltage of each
channel up to the regulation voltage. However that CH2 to CH6 start until the CH1
reaches regulation. Consider the input voltage and load current to design the capacitor
connected to the SS pin. It can calculate the CH1~6 soft start time Ts(s)(valid
threshold 0.3~0.8V interval).
∆V
∆t
C ×
= I
Ts(s) = 0.5× C(µF)
Note : It could be disabled soft start function by floating SS pin.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1/10/2006
REV:1.0
18
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
SCP Protection Setting (CH3~CH6)
The CSCP comparator detects CH3, CH4, CH5 and CH6 output voltage while the
power converter work at normal condition. At the same time, the voltage level of
CSCP pin is held at low level. If the output load of these converters rapidly
malfunction or short, causing the output voltage to drop, the CSCP comparator detects
that to enable short circuit protection. The time period when short circuit protection
show as follow equation.
Short detection time (TPE(s))
TPE(s) = 0.9 * CCSCP (µF)
Note : It could be disabled short circuit protection function by connecting CSCP pin
into the ground.
Determine the triangular Oscillator Frequency
The triangular oscillator frequency is determined by the timing capacitor (CT). It is
difficult to incorporate these non-linear characteristics into the equation. This
difference is caused by characteristics, such as changes in the maximum voltage
amplitude of the sawtooth waveform with the CT value and the circuit delay causing
the maximum amplitude to become large in the case of a high oscillating frequency
even for the same capacitor. In practical use, therefore, the user should read the CT
values from the characteristic curve or should determine an approximate target value
by using the equation.
41000
CT ( pF)
f
OSC (KHz) =
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
19
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Package Outline: QFN48
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
1/10/2006 REV:1.0
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
20
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Reflow Profiles
Sn-Pb Eutectic Assembly
Pb-Free Assembly
Large Body
Pkg. thickness
≥2.5mm or Pkg.
volume ≥350mm3
Large Body
Small Body
Pkg. thickness
≥2.5mm or Pkg.
Small Body
Pkg. thickness
<2.5mm or Pkg.
volume <350mm3
Profile Feature
Pkg. thickness
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
Average ramp-up rate
3°C/second max.
(T to T )
L
P
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
100°C
150°C
150°C
200°C
60-120 seconds
60-180 seconds
Tsmax to T
L
-
3°C/second max.
-Ramp-up Rate
Time maintained above:
-Temperature (T )
L
183°C
217°C
-Time (t )
L
60-150 seconds
60-150 seconds
Peak Temperature(T )
P
225+0/-5°C
240+0/-5°C
245+0/-5°C
250+0/-5°C
Time within 5°C of actual
10-30 seconds
10-30 seconds
10-30 seconds
20-40 seconds
Peak Temperature (t )
P
Ramp-down Rate
6°C/second max.
6 minutes max.
3°C/second max.
8 minutes max.
Time
25°C
to
Peak
Temperature
*All temperatures refer to topside of the package, measured on the package body surface.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1/10/2006
REV:1.0
21
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