AT1397A

AT1397A AIMTRON | Alldatasheet

Document overview

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Technical content

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

Applications

• DSC Power Supply 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. Pin Assignment AT1397 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 AT1397AN AT1397BN

Ordering Information

QFN48,Green ： A:1397AN B:1397BN ： Date Code *For more marking information, contact our sales representative directly. Aimtron reserves the right without notice to change this circuitry and specifications.

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Block Diagram Ramp1 0.8V FB1 CTL3 COMP1 SS1 CTL1 PVCC1 LX1 PGND1 Ramp2 0.8V FB2 Step- Down Pre- Driver Current Sense COMP2 SS2 PVCC2 LX2 PGND2 Power Good /SDOK OSC1 0.8V FB3 Step- Down Pre- Driver COMP3 SS3 PVCC3 OUT3S OUT3M PGND3 OSC2 IN4 Step- Up/ Down Pre- Driver SS4 PVCC4 OUT4 SEL4 COMP4 IP4 CTL4 *Selectable P-ch or N-ch driver for step-down/up/ inverting converter OSC1 FB5 Step- Up Pre- Driver SS5 OUT5 CTL5 COMP5 VREF FB5H OVP OSC2 FB6 Step- Up Pre- Driver SS6 OUT6 0.8V COMP6 CTL6 Short-Circuit Protection CSCP SCP3 SCP4 SCP5 SCP6 OVP VRGEN VBGEN LDO 2.3V OSC CTLU Ramp Gen CT VBG 1.22V VREG VCC GND CTL2 *Metal Option LED Driver (VREF=0.2V) or Step-Up(VREF=0.8V) Ramp2 Ramp1 OSC2 OSC1 Step- Down Pre- Driver Current Sense SS1OK SS1OK SS1OK SS1OK SS1OK SS1OK UVLO 0.8V

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Pin Description Symbol Pin No. Descript SS1 CH1 Soft-Start Input CTL5 CH5 Enable Input CTL6 CH6 Enable Input LX1 CH1 Converter Switching Node CTL1 CH1 Enable and Chip Enable Input PGND1 Power Ground PGND2 Power Ground CTL2 CH2 Enable Input LX2 CH2 Converter Switching Node CTL3 CH3 Enable Input CTL4 CH4 Enable Input SS2 CH2 Soft-Start Input /SDOK Open-Drain, Active Low, Power Good for CH2 CSCP Short Circuit Protection Input PVCC2 CH2 Converter Input COMP2 CH2 Controller Compensation Node FB2 CH2 Converter Feedback Input SS3 CH3 Soft-Start Input COMP3 CH3 Compensation Node FB3 CH3 Feedback Input SS4 CH4 Soft-Start Input COMP4 CH4 Compensation Node IN4 CH4 Negative Feedback Input IP4 CH4 Positive Feedback Input PVCC3 CH3 Power Input OUT3M CH3 Master Output Driver OUT3S CH3 Slave Output Driver PGND3 Power Ground OUT4 CH4 Output Driver OUT5 CH5 Output Driver OUT6 CH6 Output Driver PVCC4 CH4, CH5 and CH6 Power Input GND Power Ground FB5H CH5 Controller Over Voltage Protection Input FB5 CH5 Controller Voltage Feedback/Current Feedback COMP5 CH5 Compensation Node VBG Reference Bypass SS5 CH5 Soft-Start Input FB6 CH6 Feedback Input COMP6 CH6 Compensation Node CT Oscillator Control VREG Reference Output FB1 CH1 Converter Feedback Input COMP1 CH1 Controller Compensation Node VCC IC Power Input PVCC1 CH1 Converter Input SS6 CH6 Soft-Start Input SEL4 Configures the CH4 as a Step-Up or Step-Down

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Absolute Maximum Ratings*1 Rated Value Parameter Symbol Min. Max. Units Storage Temperature TSTG -55 150 Operating Temperature TA TOPR -35 PVCC1,PVCC2,PVCC3,PVCC4 Input Voltage -0.3 6.0 V LX1,LX2, OUT3M,OUT3S Input Voltage 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 KV ESD Susceptibility*2 MM 200 V Power Consumption Pd 1000 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 Parameter Symbol Min Typ Max Unit Startup power supply voltage Vcc 2.5 5.5 V Power supply voltage PVCC 2.5 5.5 V Feedback input voltage VIN Vcc-2 V Control input voltage VCTL Vcc V Soft start capacitor CSS 0.1 1.0 µF Short Circuit Protection Capacitor CSCP 0.1 1.0 µF VREG pin capacitor CVREG 0.082 0.1 µF Operating ambient temperature* TA -20 *Using X5R or X7R input capacitors.

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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

Electrical Characteristics

(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V, Ta=+250C) Values Parameter Symbol Condition Min. Typ. Max. Unit GENERAL Input Voltage Range VCC IC Power Input 2.5 5.5 V VCC Under Voltage Lockout VUV 2.35 2.4 2.45 V UVLO Hysteresis VHY 100 mV CH1,CH2 Switch- Off Input Current IIN1 No Switching, FB1=FB2=0.9V CTL1=CTL2=3.6V, other disable 1.1 1.2 mA CH1,CH2, CH3(or 4,5,6) Switch- Off Input Current IIN2 No Switching, FB1=FB2=FB3=0.9V CTL1=CTL2=CTL3=3.6V, other disable 1.3 1.4 mA Shutdown Current ICC All CTL disable, VCC=3.6V µA REFERENCE Reference Output Voltage VREG IREG =1mA 2.25 2.30 2.35 V Reference Load Regulation ∆VREG1 1mA< IREG <5mA mV Reference Line Regulation ∆VREG2 2.5<VCC<5.5V mV OSC Frequency fOSC CT=82pF 500 KHz Frequency variation with Temperature ∆fOSC1 Ta=-20°C ~+85°C Frequency variation with Input Voltage ∆fOSC2 VCC =2.5V~5.5V CHANNEL 1, 2 Input Voltage Range PVCC1/2 2.5 5.5 V Normal Operating Soft-Start Charge Current ISS1/2 VCC =2.5V~5.5V 0.7 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 FB1/2=0.7V 100

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 LX Leakage Current ILX1/2 VLX1/2=0~3.6V µA RN N-Channel 200 250 mΩ Switch On-Resistance RP P-Channel 250 300 mΩ P-Channel Current Limit ILimit2 1.0 1.2 1.4 A N-Channel Turn-off Current IREV2 mA /SDOK Output Low Voltage VSDOK 0.1mA into /SDOK 0.01 0.1 V /SDOK Leakage current IL_SDOK CTL2=0V, /SDOK=5.5V 0.1 µA CHANNEL 3 Input Voltage Range PVCC3 2.5 5.5 V Normal Operating Soft-Start Charge Current ISS3 VCC =2.5V~5.5V 0.7 1.3 µA FB3 input Current IFB3 FB3=0.8V 100 nA FB3 Regulation Voltage VFB3 Ta=-20°C ~+85°C, FB3=COMP3 0.784 0.8 0.816 V Error Amplifier Voltage Gain AV DC dB Error Amplifier Frequency Bandwidth BW AV=0dB MHz VOH 1.0 V Error Amplifier Output Voltage VOL mV Isource COMP=0.8V mA Error Amplifier Output Source/Sink Current Isink COMP=0.8V µA Maximum Duty Cycle DMAX FB3=0.7V 100 Isource DUTY=90%,OUT=1/2VC C -130 -80 mA Output Source/Sink Current Isink DUTY=0%,OUT=1/2VCC 100 mA ROH OUT=-15mA Ω Output On-Resistor ROL OUT=15mA Ω CHANNEL 4, 5, 6 Input Voltage Range PVCC4 CH4, 5, 6 2.5 5.5 V Normal Operating Soft-Start Charge Current ISS4/5/6 VCC =2.5V~5.5V 0.7 1.3 µA FB4/5/6 Regulation Voltage VFB4/5/6 Ta=-20°C ~+85°C, FB_=COMP_ 0.784 0.8 0.816 V FB5 Regulation Voltage for LED Driver VFB5 Ta=-20°C ~+85°C, FB5=COMP5 0.19 0.20 0.21 V

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 FB5H OVP Trip Level VFB5H Ta=-20°C ~+85°C, 0.98 1.00 1.02 V Error Amplifier Voltage Gain AV DC dB Error Amplifier Frequency Bandwidth BW AV=0dB MHz VOH 1.0 V Error Amplifier Output Voltage VOL mV Isource COMP=0.8V mA Error Amplifier Output Source/Sink Current Isink COMP=0.8V µA DMAX FB_=0.7V Maximum Duty Cycle DMAX FB5=0.1V Isource DUTY=90%,OUT=1/2VC C -130 -80 mA Output Source/Sink Current Isink DUTY=0%,OUT=1/2VCC 100 mA ROH OUT=-15mA Ω Output On-Resistor ROL OUT=15mA 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 1.3 µA CONTROL BLOCK VIH Active Mode 1.5 VCC V CTL Input Voltage VIL Standby Mode 0.5 V CTL Hysteresis △VH 100 mV VIH Step-Up Type 1.5 VCC V SEL4 Input Voltage VIL Step-Down Type 0.5 V SEL4 Hysteresis △VH 100 mV

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Typical Characteristics CH1,2 Efficiency VS. Load Current 100 100 1000 Load Current(mA) Efficiency(%) VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V VBAT=3.0V VBAT=2.5V CH1,2 Efficiency VS. Load Current 100 100 1000 Load Current(mA) Efficiency(%) VBAT=4.2V VBAT=3.8V VBAT=3.6V CH3 Efficiency VS. Load Current 100 100 1000 Load Current(mA) Efficiency(%) VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V CH4,5,6 Efficiency VS. Load Current 100 100 1000 Load Current(mA) Efficiency(%) VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V VBAT=3.0V VBAT=2.5V CH4,5,6 Efficiency VS. Load Current 100 100 Load Current(mA) Efficiency(%) VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V VBAT=3.0V VBAT=2.5V CH4 Efficiency VS. Load Current 100 100 Load Current(mA) Efficiency(%) VBAT=4.2V VBAT=3.8V VBAT=3.6V VBAT=3.3V VBAT=3.0V VBAT=2.5V Vout =1.8V Vout =3.3V Vout =3.0V Vout =5.0V Vout=15V Vout =-7.5V

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Typical Characteristics (Continued ) Efficiency VS. Input Voltage 100 2.5 3.0 3.5 4.0 4.5 Input Voltage-VIN (V) Efficiency(%) No-Load Input Current VS. Input Voltage 0.6 0.8 1.0 1.2 1.4 1.6 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage-VIN (V) Input Current(mA) CH1 CH1+CH2 Reference Voltage VS. Temperature 2.275 2.280 2.285 2.290 2.295 2.300 2.305 -20 100 Temperature Reference Voltage(V) Switching Frequency VS. Temperature 460 470 480 490 500 510 520 -20 100 Temperature Switching Frequency(KHz) Maximum Duty VS. Temperature -20 100 Temperature Maximum Duty(%) P-MOS N-MOS FB Regulation Voltage VS. Temperature 0.785 0.790 0.795 0.800 0.805 -20 100 Temperature FB Regulation Voltage(V) Vout1,2=1.8V Iout1,2=300mA Vout4=5.0V Iout4=50mA Vout1,2=3.3V Iout1,2=300mA Vout3=3.0V Iout3=300mA

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Typical Characteristics (Continued ) VBAT=3.8V CH1：CTL1， CH2：VOUT1 CH3：IOUT1， CH4：Iin VBAT=4.2V CH1：CTL， CH2：VOUT1 CH3：VOUT2， CH4：VOUT3 VBAT=3.8V CH2：VOUT2， CH3：IOUT2 VBAT=3.8V CH1：CTL2， CH2：VOUT2 CH3：IOUT2， CH4：Iin VBAT=3.8V CH2：VOUT1， CH3：IOUT1 VBAT=3.8V CH2：VOUT3， CH3：IOUT3

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Typical Application Circuits OUT5 SS6 FB6 OUT6 PGND3 PVCC4 PVCC4 VBAT 1-Cell Li-Ion 3.4V~4.2V FB5H FB5 SS5 LED+ 2~4Cell 20mA VBAT OUT4 IP4 SS4 VREG PVCC3 VBAT FB3 SS3 SEL4 PGND1 LX1 PVCC1 FB1 SS1 PVCC4 PGND2 LX2 PVCC2 FB2 SS2 VDSP_Core +1V8/200mA VBG VCC GND COMP1 COMP2 CT CTL1 CTL3 CTL4 CTL5 CTL6 /SDOK OUT3M OUT3S CH6 Voltage-Mode Step-Up PWM CH4 Voltage-Mode Inverting PWM IN4 CH5 Voltage-Mode PWM LED Driver CH3 Voltage-Mode Synchronous Step-Down PVCC4 CH1 Current-Mode Synchronous Step-Down PWM CH2 Current-Mode Synchronous Step-Down PWM CSCP COMP6 COMP5 COMP4 COMP3 VBAT VDSP_IO +3V3/200mA CCD Bias -6V3/50mA Short-Circuit Protection Power ON LENS ON CCD ON LED ON AT1397A 6.8uH VBAT 1uF 0.1uF 22uF 10uF 125K 100K 1uF 0.1uF 6.8uH 100K 312.5K 22uF 0.1uF MBR140WS 10uH 0.1uF 0.1uF 10K 100K 275K 10uF 1uF UPM2032BN UPM2031AN 22uF 0.1uF 10K 0.1uF 10K 140K 10uF MBR140WS UPM2031AN 10uF 10uH UPM2031AN MBR140WS 0.1uF 10R 1uF 10K 150K 0.22uF 1uF 0.22uF 10K 0.1uF 10uF /6V3 MBR140WS 10uH UPM2032BN 10uF LED- 10K 10K 10K 64.9K 1500pF 51K 51K 1500pF 82pF CTL2 0.47uF 10K VBAT 10uF MBR140WS MBR140WS VLENS +3V/300mA 10uH 10uF CCD Bias +12V/50mA 33pF 33pF PVCC3 1-Li Battery Application 1

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Typical Application Circuits ( Continued ) OUT5 SS6 FB6 OUT6 PGND3 PVCC4 PVCC4 VBAT 1-Cell Li-Ion 3.4V~4.2V FB5H FB5 SS5 LCD +12V/50mA VBAT OUT4 IP4 SS4 VREG PVCC3 VBAT FB3 SS3 SEL4 PGND1 LX1 PVCC1 FB1 SS1 PVCC4 PGND2 LX2 PVCC2 FB2 SS2 VDSP_Core +1V8/200mA VBG VCC GND COMP1 COMP2 CT CTL1 CTL3 CTL4 CTL5 CTL6 /SDOK OUT3M OUT3S CH6 Voltage-Mode Step-Up PWM CH4 Voltage-Mode Inverting PWM IN4 CH5 Voltage-Mode Step-Up PWM CH3 Voltage-Mode Synchronous Step-Down PVCC4 CH1 Current-Mode Synchronous Step-Down PWM CH2 Current-Mode Synchronous Step-Down PWM CSCP COMP6 COMP5 COMP4 COMP3 VBAT VDSP_IO +3V3/200mA CCD Bias -6V3/50mA Short-Circuit Protection Power ON LENS ON CCD ON LED ON AT1397B 6.8uH VBAT 1uF 0.1uF 22uF 10uF 125K 100K 1uF 0.1uF 6.8uH 100K 312.5K 22uF 0.1uF MBR140WS 10uH 0.1uF 0.1uF 10K 100K 275K 10uF 1uF UPM2032BN UPM2031AN 22uF 0.1uF 10K 0.1uF 10K 140K 10uF MBR140WS UPM2031AN 10uF 10uH UPM2031AN MBR140WS 0.1uF 10uF 10K 140K 0.1uF 1uF 0.22uF 10K 0.1uF 10uF /6V3 MBR140WS 10uH UPM2032BN 10uF 10K 10K 10K 64.9K 1500pF 51K 51K 1500pF 82pF CTL2 0.47uF VBAT 10uF MBR140WS MBR140WS VLENS +3V/300mA 10uH 10uF CCD Bias +12V/50mA 33pF 33pF PVCC3 1- Li Battery Application 2

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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

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 Selectable DC/DC controller for boost/flyback/buck/inverting converters.(CH4) z White LED driver with open LED protection or boost controller.(CH5) z 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. Figure 1. Using /SDOK to drive external P-MOSFET that gates 3V power to LENs after 3.3V I/O voltage is in regulation

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 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: 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: Where K is defined as: 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) OUT IN V V S T R L K = 2 i O V V M = K D V V i O M M K D

7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Figure 6. +15V and –7.5V CCD Bias with Charge-Pump (using AT1202 to regulated the negative output) threshold 0.3~0.8V interval). Note : It could be disabled soft start function by floating SS pin.

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 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 pF C KHz f T OSC

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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

Preliminary Product Information 6-Channel DC-DC Converter for DSC 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 Reflow Profiles Sn-Pb Eutectic Assembly Pb-Free Assembly Profile Feature Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness <2.5mm or Pkg. volume <350mm3 Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Average ramp-up rate (TL to TP) 3°C/second max. 3°C/second max. Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds Tsmax to TL -Ramp-up Rate 3°C/second max. Time maintained above: -Temperature (TL) -Time (tL) 183°C 60-150 seconds 217°C 60-150 seconds Peak Temperature(TP) 225+0/-5°C 240+0/-5°C 245+0/-5°C 250+0/-5°C Time within 5°C of actual Peak Temperature (tP) 10-30 seconds 10-30 seconds 10-30 seconds 20-40 seconds Ramp-down Rate 6°C/second max. 3°C/second max. Time 25°C to Peak Temperature 6 minutes max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface.