AIMTRON AT1397A

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
• 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
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.
Applications
• DSC Power Supply
Pin Assignment
36
35
34
33
32
31
30
29
28
27
26
25
37
24
38
23
39
22
40
21
AT1397
41
42
20
19
43
18
44
17
45
16
46
15
47
14
48
13
1
2
3
4
5
6
7
8
9
10
11
12
AT1397AN
AT1397BN
CH1
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
CH1
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
CH2
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
CH2
Synchronous Rectified
Current Mode Step-Down
On-Chip MOSFET
CH3
Synchronous Rectified
Voltage Mode Step-Down
CH3
Synchronous Rectified
Voltage Mode Step-Down
CH4
Seletable Voltage Mode
Step-Up/Down/Inverting
CH4
Seletable Voltage Mode
Step-Up/Down/Inverting
CH5
Voltage Mode PWM
LED Driver
CH5
Voltage Mode PWM
Step-Up
CH6
Voltage Mode Step-Up
CH6
Voltage Mode Step-Up
Ordering Information
Part Number
Package
QFN48,Green
AT1397 N
: A:1397AN
B:1397BN
: Date Code
Marking
*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
1/10/2006
REV:1.0
Email: [email protected]
1
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Block Diagram
COMP1
FB1
0.8V
PVCC1
StepDown
PreDriver
+
+
SS1
LX1
SS1OK
CTL1
Current
Sense
Ramp1
COMP2
SS1OK
FB2
+
0.8V
Power
Good
PVCC2
StepDown
PreDriver
+
SS2
/SDOK
PGND1
Ramp2
LX2
Current
Sense
CTL2
PGND2
PVCC3
COMP3
SS1OK
-
FB3
0.8V
OUT3S
StepDown
PreDriver
+
+
-
+
SS3
OUT3M
PGND3
OSC1
CTL3
SEL4
COMP4
SS1OK
IN4
StepUp/
Down
PreDriver
-
IP4
+
+
-
+
SS4
CTL4
PVCC4
OUT4
*Selectable P-ch or N-ch
driver for step-down/up/
inverting converter
OSC2
FB5H
+
OVP
-
COMP5
1V
FB5
SS1OK
-
StepUp
PreDriver
+
+
-
+
VREF
SS5
CTL5
OUT5
*Metal Option
LED Driver (VREF=0.2V)
or Step-Up(VREF=0.8V)
OSC1
COMP6
SS1OK
FB6
-
0.8V
StepUp
PreDriver
+
+
-
+
SS6
OSC2
CTL6
OSC1
OSC2
Ramp1 Ramp2
Ramp
Gen
OSC
CT
SCP3
SCP4
OUT6
SCP5
SCP6
OVP
Short-Circuit
Protection
CSCP
0.8V
CTLU
UVLO
2V
VBGEN
1.22V
VRGEN
VBG
LDO
2.3V
VCC
GND
VREG
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
1/10/2006
REV:1.0
Email: [email protected]
2
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Pin Description
Symbol
SS1
CTL5
CTL6
LX1
CTL1
PGND1
PGND2
CTL2
LX2
CTL3
CTL4
SS2
/SDOK
CSCP
PVCC2
COMP2
FB2
SS3
COMP3
FB3
SS4
COMP4
IN4
IP4
PVCC3
OUT3M
OUT3S
PGND3
OUT4
OUT5
OUT6
PVCC4
GND
FB5H
FB5
COMP5
VBG
SS5
FB6
COMP6
CT
VREG
FB1
COMP1
VCC
PVCC1
SS6
SEL4
Pin No.
1
2
3
4
5
6
7
8
9
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
Descript
CH1 Soft-Start Input
CH5 Enable Input
CH6 Enable Input
CH1 Converter Switching Node
CH1 Enable and Chip Enable Input
Power Ground
Power Ground
CH2 Enable Input
CH2 Converter Switching Node
CH3 Enable Input
CH4 Enable Input
CH2 Soft-Start Input
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
CH3 Compensation Node
CH3 Feedback Input
CH4 Soft-Start Input
CH4 Compensation Node
CH4 Negative Feedback Input
CH4 Positive Feedback Input
CH3 Power Input
CH3 Master Output Driver
CH3 Slave Output Driver
Power Ground
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
CH5 Soft-Start Input
CH6 Feedback Input
CH6 Compensation Node
Oscillator Control
Reference Output
CH1 Converter Feedback Input
CH1 Controller Compensation Node
IC Power Input
CH1 Converter Input
CH6 Soft-Start Input
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
3
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Absolute Maximum Ratings*1
Parameter
Rated Value
Symbol
Min.
Max.
Units
Storage Temperature
TSTG
-55
150
℃
Operating Temperature TA
TOPR
-35
85
℃
-
-0.3
6.0
V
VLX/OUT
-0.3
6.0
V
Other Input Pin
-
-0.3
6.0
V
LX1, LX2 Current
-
-
2.25
A
OUT3M,OUT3S Current
-
-
200
mA
HBM
-
2
KV
MM
-
200
V
Pd
-
1000
mW
PVCC1,PVCC2,PVCC3,PVCC4 Input Voltage
LX1,LX2, OUT3M,OUT3S Input Voltage
ESD Susceptibility*2
Power Consumption
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)
Min
Value
Typ
Max
Vcc
2.5
--
5.5
V
PVCC
2.5
--
5.5
V
Feedback input voltage
VIN
0
--
Vcc-2
V
Control input voltage
VCTL
0
--
Vcc
V
Soft start capacitor
CSS
--
0.1
1.0
µF
Short Circuit Protection Capacitor
CSCP
--
0.1
1.0
µF
CVREG
0.082
0.1
--
µF
TA
-20
25
85
℃
Parameter
Startup power supply voltage
Power supply voltage
VREG pin capacitor
Operating ambient temperature*
Symbol
Unit
*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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
4
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Electrical Characteristics
(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V, Ta=+250C)
Parameter
Symbol
Condition
Values
Min. Typ. Max.
Unit
GENERAL
Input Voltage Range
VCC
VCC Under Voltage Lockout
VUV
UVLO Hysteresis
VHY
CH1,CH2 Switch- Off Input
Current
IIN1
CH1,CH2, CH3(or 4,5,6)
Switch- Off Input Current
IIN2
Shutdown Current
ICC
IC Power Input
2.5
-
5.5
V
-
2.35
2.4
2.45
V
-
-
100
-
mV
-
1.1
1.2
mA
-
1.3
1.4
mA
-
1
10
µA
2.25
2.30
2.35
V
No Switching,
FB1=FB2=0.9V
CTL1=CTL2=3.6V, other
disable
No Switching,
FB1=FB2=FB3=0.9V
CTL1=CTL2=CTL3=3.6V,
other disable
All CTL disable,
VCC=3.6V
REFERENCE
Reference Output Voltage
VREG
IREG =1mA
Reference Load Regulation
∆VREG1 1mA< IREG <5mA
-
5
10
mV
Reference Line Regulation
∆VREG2 2.5<VCC<5.5V
-
-
5
mV
CT=82pF
-
500
-
KHz
∆fOSC1 Ta=-20°C ~+85°C
-
1
10
%
∆fOSC2 VCC =2.5V~5.5V
-
1
5
%
2.5
-
5.5
V
OSC
Frequency
Frequency variation with
Temperature
Frequency variation with
Input Voltage
fOSC
CHANNEL 1, 2
Input Voltage Range
-
PVCC1/2
Normal Operating Soft-Start
Charge Current
ISS1/2
VCC =2.5V~5.5V
0.7
1
1.3
µA
FB Regulation Voltage
VFB1/2
Ta=-20°C ~+85°C
0.784
0.8
0.816
V
FB input Current
IFB1/2
FB1/2=0.8V
-
-
100
nA
Current-Sense Amplifier
Transresistance
RCS
-
-
0.6
-
V/A
Transconductance
GMEA
-
-
120
-
µs
Maximum Duty Cycle
DMAX
-
100
-
%
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
5
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
LX Leakage Current
Switch On-Resistance
VLX1/2=0~3.6V
-
1
5
µA
RN
N-Channel
-
200
250
mΩ
RP
P-Channel
-
250
300
mΩ
ILX1/2
P-Channel Current Limit
ILimit2
-
1.0
1.2
1.4
A
N-Channel Turn-off Current
IREV2
-
-
20
-
mA
/SDOK Output Low Voltage
VSDOK
-
0.01
0.1
V
/SDOK Leakage current
IL_SDOK CTL2=0V, /SDOK=5.5V
-
0.1
1
µA
2.5
-
5.5
V
0.7
1
1.3
µA
-
-
100
nA
0.784
0.8
0.816
V
80
-
-
dB
-
5
-
MHz
0.1mA into /SDOK
CHANNEL 3
Input Voltage Range
-
PVCC3
Normal Operating Soft-Start
Charge Current
ISS3
VCC =2.5V~5.5V
FB3 input Current
IFB3
FB3=0.8V
FB3 Regulation Voltage
VFB3
Ta=-20°C ~+85°C,
FB3=COMP3
Error Amplifier Voltage Gain
AV
DC
Error Amplifier Frequency
Bandwidth
BW
AV=0dB
Error Amplifier Output
Voltage
Error Amplifier Output
Source/Sink Current
Maximum Duty Cycle
Output Source/Sink Current
Output On-Resistor
VOH
-
-
1.0
-
V
VOL
-
-
10
-
mV
Isource
COMP=0.8V
-
1
-
mA
Isink
COMP=0.8V
-
60
-
µA
DMAX
FB3=0.7V
-
100
-
%
Isource
DUTY=90%,OUT=1/2VC
C
-
-130
-80
mA
Isink
DUTY=0%,OUT=1/2VCC
65
100
-
mA
ROH
OUT=-15mA
-
18
30
Ω
ROL
OUT=15mA
-
16
25
Ω
2.5
-
5.5
V
0.7
1
1.3
µA
0.784
0.8
0.816
V
0.19
0.20
0.21
V
CHANNEL 4, 5, 6
Input Voltage Range
PVCC4 CH4, 5, 6
Normal Operating Soft-Start
Charge Current
ISS4/5/6
FB4/5/6 Regulation Voltage
VFB4/5/6
FB5 Regulation Voltage for
LED Driver
VFB5
VCC =2.5V~5.5V
Ta=-20°C ~+85°C,
FB_=COMP_
Ta=-20°C ~+85°C,
FB5=COMP5
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
1/10/2006
REV:1.0
Email: [email protected]
6
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
FB5H OVP Trip Level
VFB5H
Ta=-20°C ~+85°C,
Error Amplifier Voltage Gain
AV
DC
Error Amplifier Frequency
Bandwidth
BW
AV=0dB
Error Amplifier Output
Voltage
Error Amplifier Output
Source/Sink Current
Maximum Duty Cycle
Output Source/Sink Current
Output On-Resistor
0.98
1.00
1.02
V
80
-
-
dB
-
5
-
MHz
VOH
-
-
1.0
-
V
VOL
-
-
10
-
mV
Isource
COMP=0.8V
-
1
-
mA
Isink
COMP=0.8V
-
60
-
µA
DMAX
FB_=0.7V
85
90
95
%
DMAX
FB5=0.1V
85
90
95
%
Isource
DUTY=90%,OUT=1/2VC
C
-
-130
-80
mA
Isink
DUTY=0%,OUT=1/2VCC
65
100
-
mA
ROH
OUT=-15mA
-
18
30
Ω
ROL
OUT=15mA
-
16
25
Ω
SHORT CIRCUIT PROTECTION
Threshold Voltage
VTH
CH3,CH4,CH5,CH6
-
0.9
-
V
VCSCP Detect Voltage
VTH
CH3,CH4,CH5,CH6
-
0.7
-
V
CSCP Charge Current
ICSCP
CH3,CH4,CH5,CH6
0.7
1
1.3
µA
VIH
Active Mode
1.5
-
VCC
V
VIL
Standby Mode
0
-
0.5
V
-
-
100
-
mV
1.5
-
VCC
V
0
-
0.5
V
-
100
-
mV
CONTROL BLOCK
CTL Input Voltage
CTL Hysteresis
SEL4 Input Voltage
SEL4 Hysteresis
△VH
VIH
Step-Up Type
VIL
Step-Down Type
△VH
-
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
1/10/2006
REV:1.0
Email: [email protected]
7
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics
CH1,2 Efficiency VS. Load Current
90
90
80
80
70
CH1,2 Efficiency VS. Load Current
100
Efficiency(%)
Efficiency(%)
100
VBAT=4.2V
70
VBAT=4.2V
VBAT=3.8V
VBAT=3.8V
VBAT=3.6V
60
Vout =1.8V
VBAT=3.6V
60
VBAT=3.3V
Vout =3.3V
VBAT=3.0V
VBAT=2.5V
50
50
10
100
1000
10
100
Load Current(mA)
CH4,5,6 Efficiency VS. Load Current
100
90
90
80
80
Efficiency(%)
Efficiency(%)
CH3 Efficiency VS. Load Current
100
70
70
VBAT=4.2V
VBAT=4.2V
VBAT=3.8V
VBAT=3.8V
60
VBAT=3.6V
60
VBAT=3.6V
Vout =3.0V
1000
Load Current(mA)
VBAT=3.3V
Vout =5.0V
VBAT=3.3V
VBAT=3.0V
VBAT=2.5V
50
50
10
100
1000
10
100
Load Current(mA)
CH4,5,6 Efficiency VS. Load Current
CH4 Efficiency VS. Load Current
100
90
90
80
80
70
70
60
60
Efficiency(%)
Efficiency(%)
100
50
40
VBAT=4.2V
30
VBAT=3.6V
VBAT=3.0V
10
40
VBAT=4.2V
VBAT=3.8V
VBAT=3.6V
20
VBAT=3.3V
Vout=15V
50
30
VBAT=3.8V
20
1000
Load Current(mA)
VBAT=3.3V
Vout =-7.5V
VBAT=3.0V
10
VBAT=2.5V
0
VBAT=2.5V
0
1
10
Load Current(mA)
100
1
10
100
Load Current(mA)
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
1/10/2006
REV:1.0
Email: [email protected]
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
Input Current(mA)
Efficiency(%)
95
Vout1,2=1.8V
Iout1,2=300mA
Vout3=3.0V
Iout3=300mA
90
1.2
1.0
CH1
CH1+CH2
85
0.8
Vout4=5.0V
Iout4=50mA
80
0.6
2.5
3.0
3.5
4.0
4.5
2.5
3.0
3.5
Reference Voltage VS. Temperature
2.305
4.5
5.0
5.5
6.0
Switching Frequency VS. Temperature
520
510
Switching Frequency(KHz)
2.300
Reference Voltage(V)
4.0
Input Voltage-VIN (V)
Input Voltage-VIN (V)
2.295
2.290
2.285
500
490
480
470
2.280
460
2.275
-20
0
20
40
60
80
-20
100
0
20
Temperature
Maximum Duty VS. Temperature
96
40
60
80
100
Temperature
0.805
FB Regulation Voltage VS. Temperature
95
93
FB Regulation Voltage(V)
Maximum Duty(%)
94
P-MOS
92
N-MOS
91
90
0.800
0.795
0.790
89
88
87
0.785
-20
0
20
40
Temperature
60
80
100
-20
0
20
40
60
80
100
Temperature
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
1/10/2006
REV:1.0
Email: [email protected]om.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
CH1:CTL2, CH2:VOUT2
CH3:IOUT1, CH4:Iin
CH3:IOUT2, CH4:Iin
VBAT=4.2V
VBAT=3.8V
CH1:CTL, CH2:VOUT1
CH2:VOUT1, CH3:IOUT1
CH3:VOUT2, CH4:VOUT3
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
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
10uF
MBR140WS
UPM2031AN
1uF
OUT5
150K
CH5
Voltage-Mode
PWM LED
Driver
MBR140WS
10uF
140K
FB6
COMP6
10K
1K
LED0.22uF
10R
10K
0.1uF
10K
SS6
COMP5
FB5
10K
CCD Bias
+12V/50mA
OUT6 UPM2031AN
CH6
Voltage-Mode
Step-Up PWM
FB5H
0.1uF
10uH
10uF
PVCC4
PVCC4
0.1uF
PVCC3
SS5
1uF
PVCC3
SEL4
VBAT
10uF
OUT3M
VBAT
PVCC4
1uF
10uF
CCD Bias
-6V3/50mA
UPM2032BN
PVCC4
OUT4
MBR140WS
10uF
/6V3
64.9K
CH3
Voltage-Mode
Synchronous
Step-Down
CH4
Voltage-Mode
Inverting PWM
MBR140WS
FB3
COMP3
COMP4
0.1uF
10K
0.1uF
VBG
CH1
Current-Mode
Synchronous
Step-Down
PWM
VDSP_Core
+1V8/200mA
LX1
6.8uH
22uF
PGND1
51K
VBAT
10uF
AT1397A
0.1uF
1500pF
100K
PVCC1
VREG
10K
0.1uF
10K
IN4
1uF
MBR140WS
COMP1
0.47uF
SS1
CSCP
CT
0.1uF
Short-Circuit
Protection
PVCC2
82pF
1500pF
51K
33pF
CH2
Current-Mode
Synchronous
Step-Down
PWM
6.8uH
22uF
MBR140WS
CTL3
100K
FB2
SS2
0.1uF
CTL4
VCC
LED ON
312.5K
CTL1
CTL2
CCD ON
VDSP_IO
+3V3/200mA
LX2
PGND2
LENS ON
VBAT
10uF
COMP2
/SDOK
Power ON
125K
100K
FB1
33pF
275K
UPM2031AN
SS3
IP4
10K
22uF
OUT3S
SS4
10K
VLENS
+3V/300mA
10uH
PGND3
0.22uF
10uH
UPM2032BN
CTL5
CTL6
VBAT
1uF
GND
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
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
10uF
MBR140WS
LCD
+12V/50mA
UPM2031AN
10uF
OUT5
CH5
Voltage-Mode
Step-Up PWM
MBR140WS
10uF
140K
FB6
COMP6
1K
140K
CCD Bias
+12V/50mA
OUT6 UPM2031AN
CH6
Voltage-Mode
Step-Up PWM
FB5H
0.1uF
10uH
10uF
PVCC4
PVCC4
COMP5
10K
0.1uF
10K
SS6
FB5
0.1uF
0.1uF
SS5
PVCC3
10K
1uF
VBAT
PVCC3
SEL4
10uF
OUT3M
VBAT
PVCC4
10uF
CCD Bias
-6V3/50mA
1uF
UPM2032BN
PVCC4
OUT4
MBR140WS
10uF
/6V3
64.9K
CH3
Voltage-Mode
Synchronous
Step-Down
CH4
Voltage-Mode
Inverting PWM
MBR140WS
FB3
COMP3
COMP4
0.1uF
10K
0.1uF
VBG
CH1
Current-Mode
Synchronous
Step-Down
PWM
VDSP_Core
+1V8/200mA
LX1
6.8uH
22uF
PGND1
51K
VBAT
10uF
AT1397B
0.1uF
1500pF
100K
PVCC1
VREG
10K
0.1uF
10K
IN4
1uF
MBR140WS
COMP1
SS1
0.47uF
CSCP
CT
0.1uF
Short-Circuit
Protection
PVCC2
82pF
1500pF
51K
/SDOK
CH2
Current-Mode
Synchronous
Step-Down
PWM
6.8uH
22uF
MBR140WS
CTL3
100K
FB2
SS2
0.1uF
CTL4
VCC
LED ON
312.5K
CTL1
CTL2
CCD ON
VDSP_IO
+3V3/200mA
LX2
PGND2
LENS ON
VBAT
10uF
COMP2
33pF
Power ON
125K
100K
FB1
33pF
275K
UPM2031AN
SS3
IP4
10K
22uF
OUT3S
SS4
10K
VLENS
+3V/300mA
10uH
PGND3
0.22uF
10uH
UPM2032BN
CTL5
CTL6
VBAT
1uF
GND
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
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
Step-Down DC/DC converter with on-chip synchronous MOSFETs.(CH1, CH2)
z
Main synchronous DC/DC controller for Step-Down converter.(CH3)
z
z
z
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
1/10/2006
REV:1.0
Email: [email protected]
13
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
PVCC3
VBAT
VBG
OUT3M
VBAT
VCC
CH3
Voltage-Mode
Synchronous
Step-Down
VLENS
+3V
OUT3S
C1
GND
R1
PGND3
FB3
R2
COMP3
SS3
PVCC1
VBAT
COMP1
CH1
Current-Mode
Synchronous
Step-Down
PWM
LX1
VDSP_Core
+1V8
PGND1
FB1
SS1
PVCC2
COMP2
CH2
Current-Mode
Synchronous
Step-Down
PWM
LX2
VBAT
VDSP_IO
+3V3
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
1/10/2006
REV:1.0
Email: [email protected]
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:
1−
V IN
≤ 85%
VOUT
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
VO = Vi ×
2
D = K × M × ( M − 1)
Where K is defined as:
2×L
K=
R × TS
M =
VO
Vi
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
1/10/2006
REV:1.0
Email: [email protected]
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
16
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
VBAT
-7.5V
15V
PVCC4
CH6
Voltage-Mode
Step-Up PWM
OUT6
FB6
COMP6
SS6
Figure 4. +15V and –7.5V CCD Bias with transformer
VBAT
-7.5V
PVCC4
15V
CH6
Voltage-Mode
Step-Up PWM
OUT6
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
17
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
VBAT
15V
PVCC4
CH6
Voltage-Mode
Step-Up PWM
OUT6
FB6
COMP6
SS6
IN
OUT
/SHDN GND
FB
+
-
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).
C×
∆V
=I
∆t
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
1/10/2006
REV:1.0
Email: [email protected]
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.
f OSC ( KHz ) =
41000
CT ( pF )
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
1/10/2006
REV:1.0
Email: [email protected]
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
1/10/2006
REV:1.0
Email: [email protected]
20
AT1397A/B
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Reflow Profiles
Profile Feature
Average ramp-up rate
(TL to TP)
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
Tsmax to TL
-Ramp-up Rate
Time maintained above:
-Temperature (TL)
-Time (tL)
Peak Temperature(TP)
Time within 5°C of actual
Peak Temperature (tP)
Ramp-down Rate
Time
25°C
to
Peak
Temperature
Sn-Pb Eutectic Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
<2.5mm or Pkg.
≥2.5mm or Pkg.
3
volume ≥350mm3 volume <350mm
Pb-Free Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
≥2.5mm or Pkg.
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
3°C/second max.
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
-
3°C/second max.
183°C
60-150 seconds
217°C
60-150 seconds
225+0/-5°C
240+0/-5°C
245+0/-5°C
250+0/-5°C
10-30 seconds
10-30 seconds
10-30 seconds
20-40 seconds
6°C/second max.
3°C/second max.
6 minutes max.
8 minutes max.
*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
1/10/2006
REV:1.0
Email: [email protected]
21