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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Features
* 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
General Description
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
AT1397AN
36 37 38 39 40 41 42 43 44 45 46 47 48 1 2 3 4 5 6 7 8 9 10 11 12 35 34 33 32 31 30 29 28 27 26 25 24 23 22
AT1397BN CH1 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 CH4 Seletable Voltage Mode Step-Up/Down/Inverting CH5 Voltage Mode PWM Step-Up CH6 Voltage Mode Step-Up
CH1 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 CH4 Seletable Voltage Mode Step-Up/Down/Inverting CH5 Voltage Mode PWM LED Driver CH6 Voltage Mode Step-Up
AT1397
21 20 19 18 17 16 15 14 13
Ordering Information
Part Number Package QFN48,Green AT1397 N A:1397AN B:1397BN Date Code *For more marking information, contact our sales representative directly. Marking
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: service@aimtron.com.tw 1
AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Block Diagram
COMP1 FB1 0.8V SS1 SS1OK CTL1 Ramp1 COMP2 FB2 0.8V SS2 /SDOK CTL2 COMP3 FB3 0.8V SS3 CTL3 COMP4 IN4 IP4 SS4 CTL4 FB5H COMP5 1V FB5 VREF SS5 CTL5 COMP6 FB6 0.8V SS6 CTL6
OSC1 OSC2
+ +
StepDown PreDriver
PVCC1
LX1
Current Sense SS1OK
PGND1
+ +
StepDown PreDriver
PVCC2
LX2
Power Good
Ramp2
Current Sense
PGND2 PVCC3
SS1OK + + + StepDown PreDriver OUT3S
OUT3M PGND3 SEL4
OSC1
SS1OK + + + StepUp/ Down PreDriver *Selectable P-ch or N-ch driver for step-down/up/ inverting converter + OVP + SS1OK + + OSC1 SS1OK + + + OSC2
Ramp1 Ramp2
PVCC4 OUT4
OSC2
StepUp PreDriver *Metal Option LED Driver (VREF=0.2V) or Step-Up(VREF=0.8V) StepUp PreDriver
OUT5
OUT6
SCP3
SCP4
SCP5
SCP6
OVP
CT CTLU
OSC
Ramp Gen 0.8V
Short-Circuit Protection UVLO
CSCP VCC GND
2V VBGEN VRGEN
1.22V
LDO 2.3V
VBG
VREG
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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
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Absolute Maximum Ratings*1 Parameter
Storage Temperature Operating Temperature TA PVCC1,PVCC2,PVCC3,PVCC4 Input Voltage LX1,LX2, OUT3M,OUT3S Input Voltage Other Input Pin LX1, LX2 Current OUT3M,OUT3S Current ESD Susceptibility*2 Power Consumption
Symbol
TSTG TOPR
-
Rated Value Min.
-55 -35 -0.3 -0.3 -0.3 -
Max.
150 85 6.0 6.0 6.0 2.25 200 2 200 1000
Units
V V V A mA KV V mW
VLX/OUT HBM MM Pd
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 1.5K resistor into each pin.
Recommended Operating Conditions
(Ta=+250C)
Parameter
Startup power supply voltage Power supply voltage Feedback input voltage Control input voltage Soft start capacitor Short Circuit Protection Capacitor VREG pin capacitor Operating ambient temperature* *Using X5R or X7R input capacitors.
Symbol
Vcc PVCC VIN VCTL CSS CSCP CVREG TA
Min
2.5 2.5 0 0 --0.082 -20
Value Typ
----0.1 0.1 0.1 25
Max
5.5 5.5 Vcc-2 Vcc 1.0 1.0 -85
Unit
V V V V F F F
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Electrical Characteristics
(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V, Ta=+250C)
Parameter
GENERAL
Input Voltage Range VCC Under Voltage Lockout UVLO Hysteresis CH1,CH2 Switch- Off Input Current CH1,CH2, CH3(or 4,5,6) Switch- Off Input Current Shutdown Current
Symbol
Condition
Values Min. Typ. Max.
Unit
VCC VUV VHY IIN1
IC Power Input 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
2.5 2.35 -
2.4 100 1.1
5.5 2.45 1.2
V V mV mA
IIN2 ICC
-
1.3 1
1.4 10
mA A
REFERENCE
Reference Output Voltage Reference Load Regulation Reference Line Regulation VREG IREG =1mA 2.25 2.30 5 2.35 10 5 V mV mV
VREG1 1mA< IREG <5mA VREG2 2.5OSC
Frequency Frequency variation with Temperature Frequency variation with Input Voltage fOSC CT=82pF 500 1 1 10 5 KHz % %
fOSC1 Ta=-20C ~+85C fOSC2 VCC =2.5V~5.5V
CHANNEL 1, 2
Input Voltage Range Normal Operating Soft-Start Charge Current FB Regulation Voltage FB input Current Current-Sense Amplifier Transresistance Transconductance Maximum Duty Cycle
PVCC1/2
VCC =2.5V~5.5V Ta=-20C ~+85C FB1/2=0.8V FB1/2=0.7V
2.5 0.7 0.784 -
1 0.8 0.6 120 100
5.5 1.3 0.816 100 -
V A V nA V/A s %
ISS1/2 VFB1/2 IFB1/2 RCS GMEA DMAX
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC
LX Leakage Current Switch On-Resistance P-Channel Current Limit N-Channel Turn-off Current /SDOK Output Low Voltage /SDOK Leakage current ILX1/2 RN RP ILimit2 IREV2 VSDOK VLX1/2=0~3.6V N-Channel P-Channel 0.1mA into /SDOK 1.0 1 200 250 1.2 20 0.01 0.1 5 250 300 1.4 0.1 1 A m m A mA V A
IL_SDOK CTL2=0V, /SDOK=5.5V
CHANNEL 3
Input Voltage Range Normal Operating Soft-Start Charge Current FB3 input Current FB3 Regulation Voltage Error Amplifier Voltage Gain Error Amplifier Frequency Bandwidth Error Amplifier Output Voltage Error Amplifier Output Source/Sink Current Maximum Duty Cycle Output Source/Sink Current
PVCC3
VCC =2.5V~5.5V FB3=0.8V Ta=-20C ~+85C, FB3=COMP3 DC AV=0dB COMP=0.8V COMP=0.8V FB3=0.7V DUTY=90%,OUT=1/2VC C DUTY=0%,OUT=1/2VCC OUT=-15mA OUT=15mA
2.5 0.7 0.784 80 65 -
1 0.8 5 1.0 10 1 60 100 -130 100 18 16
5.5 1.3 100 0.816 -80 30 25
V A nA V dB MHz V mV mA A % mA mA
ISS3 IFB3 VFB3 AV BW VOH VOL Isource Isink DMAX Isource Isink
Output On-Resistor
ROH ROL
CHANNEL 4, 5, 6
Input Voltage Range Normal Operating Soft-Start Charge Current FB4/5/6 Regulation Voltage FB5 Regulation Voltage for LED Driver PVCC4 CH4, 5, 6 ISS4/5/6 VFB4/5/6 VFB5 VCC =2.5V~5.5V Ta=-20C ~+85C, FB_=COMP_ Ta=-20C ~+85C, FB5=COMP5 2.5 0.7 0.784 0.19 1 0.8 0.20 5.5 1.3 0.816 0.21 V A V V
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC
FB5H OVP Trip Level Error Amplifier Voltage Gain Error Amplifier Frequency Bandwidth Error Amplifier Output Voltage Error Amplifier Output Source/Sink Current VFB5H AV BW VOH VOL Isource Isink DMAX DMAX Output Source/Sink Current Isource Isink Output On-Resistor ROH ROL COMP=0.8V COMP=0.8V FB_=0.7V FB5=0.1V DUTY=90%,OUT=1/2VC C DUTY=0%,OUT=1/2VCC OUT=-15mA OUT=15mA Ta=-20C ~+85C, DC AV=0dB 0.98 80 85 85 65 1.00 5 1.0 10 1 60 90 90 -130 100 18 16 1.02 95 95 -80 30 25 V dB MHz V mV mA A % % mA mA
Maximum Duty Cycle
SHORT CIRCUIT PROTECTION
Threshold Voltage VCSCP Detect Voltage CSCP Charge Current VTH VTH ICSCP CH3,CH4,CH5,CH6 CH3,CH4,CH5,CH6 CH3,CH4,CH5,CH6 0.7 0.9 0.7 1 1.3 V V A
CONTROL BLOCK
CTL Input Voltage CTL Hysteresis SEL4 Input Voltage SEL4 Hysteresis VIH VIL VH VIH VIL VH Active Mode Standby Mode Step-Up Type Step-Down Type 1.5 0 1.5 0 100 100 VCC 0.5 VCC 0.5 V V mV V V mV
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Typical Characteristics
100
CH1,2 Efficiency VS. Load Current
100
CH1,2 Efficiency VS. Load Current
90
90
Efficiency(%)
70
Efficiency(%)
VBAT=4.2V VBAT=3.8V VBAT=3.6V
80
80
70
VBAT=4.2V VBAT=3.8V
60
Vout =1.8V
VBAT=3.3V VBAT=3.0V VBAT=2.5V
60
VBAT=3.6V
Vout =3.3V
50 10 100
Load Current(mA)
50
1000
10
100
Load Current(mA)
1000
CH3 Efficiency VS. Load Current
100 100
CH4,5,6 Efficiency VS. Load Current
90
90
Efficiency(%)
70
VBAT=4.2V VBAT=3.8V
Efficiency(%)
80
80
70
VBAT=4.2V VBAT=3.8V VBAT=3.6V
60
Vout =3.0V
VBAT=3.6V VBAT=3.3V
60
Vout =5.0V
VBAT=3.3V VBAT=3.0V VBAT=2.5V
50 10 100
Load Current(mA)
50 1000 10 100
Load Current(mA)
1000
100 90 80 70
Efficiency(%)
CH4,5,6 Efficiency VS. Load Current
100 90 80 70
Efficiency(%)
CH4 Efficiency VS. Load Current
60 50 40 30 20 10 0 1 10
Load Current(mA)
VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V VBAT=3.0V VBAT=2.5V
60 50 40 30 20 10 0
Vout =-7.5V
VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V VBAT=3.0V VBAT=2.5V
Vout=15V
100
1
10
Load Current(mA)
100
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Typical Characteristics (Continued )
100
Efficiency VS. Input Voltage
1.6
Vout1,2=3.3V Iout1,2=300mA
No-Load Input Current VS. Input Voltage
95
Efficiency(%)
1.4
Vout1,2=1.8V Iout1,2=300mA
Input Current(mA)
1.2
90
Vout3=3.0V Iout3=300mA
1.0
CH1 CH1+CH2
85
Vout4=5.0V Iout4=50mA
0.8
80 2.5 3.0 3.5
Input Voltage-VIN (V)
0.6
4.0
4.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage-VIN (V)
2.305 2.300
Reference Voltage VS. Temperature
520 510
Switching Frequency(KHz)
Switching Frequency VS. Temperature
Reference Voltage(V)
2.295 2.290 2.285 2.280 2.275 -20 0 20 40
Temperature
500 490 480 470 460
60
80
100
-20
0
20
40
Temperature
60
80
100
96 95 94
Maximum Duty(%)
Maximum Duty VS. Temperature
0.805
FB Regulation Voltage VS. Temperature
93 92 91 90 89 88 87 -20 0 20
Temperature
P-MOS N-MOS
FB Regulation Voltage(V)
0.800
0.795
0.790
0.785
40
60
80
100
-20
0
20
40
Temperature
60
80
100
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Typical Characteristics (Continued )
VBAT=3.8V CH1CTL1 CH2VOUT1 CH3IOUT1 CH4Iin
VBAT=3.8V CH1CTL2 CH2VOUT2 CH3IOUT2 CH4Iin
VBAT=4.2V CH1CTL CH2VOUT1 CH3VOUT2 CH4VOUT3
VBAT=3.8V CH2VOUT1 CH3IOUT1
VBAT=3.8V CH2VOUT2 CH3IOUT2
VBAT=3.8V CH2VOUT3 CH3IOUT3
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Typical Application Circuits
VBAT 1-Cell Li-Ion 3.4V~4.2V
MBR140WS
LED+ 2~4Cell 20mA
10uH
10uF
PVCC4 OUT5 CH5 Voltage-Mode PWM LED Driver CH6 Voltage-Mode Step-Up PWM
PVCC4
10uF
10uH MBR140WS
CCD Bias +12V/50mA 10uF
UPM2031AN 1uF 150K
OUT6 UPM2031AN 140K FB6 10K 0.1uF 10K
FB5H
10K 0.1uF LED10K 0.22uF 1K COMP5 FB5 10R SS5 SEL4
COMP6 SS6
0.1uF PVCC3 1uF PVCC3 10uF OUT3M VBAT
VBAT 10uF CCD Bias -6V3/50mA 1uF UPM2032BN MBR140WS
PVCC4 PVCC4
CH3 Voltage-Mode Synchronous Step-Down CH4 Voltage-Mode Inverting PWM
UPM2032BN 10uH
VLENS +3V/300mA 22uF
OUT3S MBR140WS PGND3 FB3 UPM2031AN 10K 0.1uF 100K 0.1uF PVCC1 VBAT 10uF 275K
OUT4
64.9K
10uF /6V3
10uH
0.22uF SS4
COMP3 COMP4 0.1uF 10K 10K IN4 IP4 VREG 10K 1uF 0.1uF 10K VBG SS3
AT1397A
CH1 Current-Mode Synchronous Step-Down PWM
LX1 6.8uH
VDSP_Core +1V8/200mA
22uF PGND1 MBR140WS 125K 100K
1500pF
51K
COMP1 FB1 SS1 CSCP CT Short-Circuit Protection 0.1uF PVCC2
0.47uF 33pF
82pF 1500pF 51K
VBAT 10uF
COMP2 /SDOK
33pF
CH2 Current-Mode Synchronous Step-Down PWM
LX2 6.8uH
VDSP_IO +3V3/200mA 22uF
PGND2 Power ON CTL1 CTL2 LENS ON CCD ON LED ON CTL3 CTL4 VCC CTL5 CTL6 GND FB2 SS2
MBR140WS
312.5K 100K
0.1uF VBAT 1uF
1-Li Battery Application 1
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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
MBR140WS LCD +12V/50mA
10uH
10uF
PVCC4 OUT5 CH5 Voltage-Mode Step-Up PWM CH6 Voltage-Mode Step-Up PWM
PVCC4
10uF
10uH MBR140WS
CCD Bias +12V/50mA 10uF
UPM2031AN 10uF
OUT6 UPM2031AN 140K FB6 10K 0.1uF 10K
FB5H
COMP6 0.1uF 140K 1K COMP5 FB5 0.1uF 10K SEL4 SS5 SS6
0.1uF PVCC3 1uF PVCC3 10uF OUT3M VBAT
VBAT 10uF CCD Bias -6V3/50mA 1uF UPM2032BN MBR140WS
PVCC4 PVCC4
CH3 Voltage-Mode Synchronous Step-Down CH4 Voltage-Mode Inverting PWM
UPM2032BN 10uH
VLENS +3V/300mA 22uF
OUT3S MBR140WS PGND3 FB3 UPM2031AN 10K 0.1uF 100K 0.1uF PVCC1 VBAT 10uF 275K
OUT4
64.9K
10uF /6V3
10uH
0.22uF SS4
COMP3 COMP4 0.1uF 10K 10K IN4 IP4 VREG 10K 1uF 0.1uF 10K VBG SS3
AT1397B
CH1 Current-Mode Synchronous Step-Down PWM
LX1 6.8uH
VDSP_Core +1V8/200mA
22uF PGND1 MBR140WS 125K 100K
1500pF
51K
COMP1 FB1 SS1 CSCP CT Short-Circuit Protection 0.1uF PVCC2
0.47uF 33pF
82pF 1500pF 51K
VBAT 10uF
COMP2 /SDOK
33pF
CH2 Current-Mode Synchronous Step-Down PWM
LX2 6.8uH
VDSP_IO +3V3/200mA 22uF
PGND2 Power ON CTL1 CTL2 LENS ON CCD ON LED ON CTL3 CTL4 VCC CTL5 CTL6 GND FB2 SS2
MBR140WS
312.5K 100K
0.1uF VBAT 1uF
1- Li Battery Application 2
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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 : 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.
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AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC
PVCC3 VBAT VBG OUT3M VBAT VCC GND PGND3 FB3 COMP3 SS3 PVCC1 COMP1 CH1 Current-Mode Synchronous Step-Down PWM LX1 VDSP_Core +1V8 VBAT R2 CH3 Voltage-Mode Synchronous Step-Down VLENS +3V OUT3S
C1 R1
PGND1 FB1 SS1
PVCC2
VBAT
COMP2
CH2 Current-Mode Synchronous Step-Down PWM
LX2
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
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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 x D2 1+ 1+ K VO = Vi x 2
D = K x M x ( M - 1)
Where K is defined as:
2xL K= R x 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: service@aimtron.com.tw 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 LEDFB5 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: service@aimtron.com.tw 16
AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC
VBAT -7.5V
PVCC4 CH6 Voltage-Mode Step-Up PWM OUT6 FB6
15V
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: service@aimtron.com.tw 17
AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC
VBAT PVCC4 CH6 Voltage-Mode Step-Up PWM OUT6 FB6 15V
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).
Cx V =I t
Ts( s ) = 0.5 x C ( F )
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: service@aimtron.com.tw 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 (F) 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 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 1/10/2006 REV:1.0 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 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 1/10/2006 REV:1.0 Email: service@aimtron.com.tw 20
AT1397A/B
Preliminary Product Information 6-Channel DC-DC Converter for DSC Reflow Profiles
Profile Feature
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
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 5C of actual Peak Temperature (tP) Ramp-down Rate Time 25C to Peak Temperature
3C/second max. 100C 150C 60-120 seconds 183C 60-150 seconds 225+0/-5C 10-30 seconds 240+0/-5C 10-30 seconds
3C/second max. 150C 200C 60-180 seconds 3C/second max. 217C 60-150 seconds 245+0/-5C 10-30 seconds 250+0/-5C 20-40 seconds
6C/second max. 6 minutes max.
3C/second 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: service@aimtron.com.tw 21

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