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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 1.5K 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 F Short Circuit Protection Capacitor CSCP -- 0.1 1.0 F CVREG 0.082 0.1 -- F 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: 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) 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 A 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=-20C ~+85C - 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 A FB Regulation Voltage VFB1/2 Ta=-20C ~+85C 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 - s 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: service@aimtron.com.tw 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 A RN N-Channel - 200 250 m RP P-Channel - 250 300 m 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 A 2.5 - 5.5 V 0.7 1 1.3 A - - 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=-20C ~+85C, 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 - A 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 ROL OUT=15mA - 16 25 2.5 - 5.5 V 0.7 1 1.3 A 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=-20C ~+85C, FB_=COMP_ Ta=-20C ~+85C, 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: service@aimtron.com.tw 6 AT1397A/B Preliminary Product Information 6-Channel DC-DC Converter for DSC FB5H OVP Trip Level VFB5H Ta=-20C ~+85C, 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 - A 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 ROL OUT=15mA - 16 25 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 A 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: 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 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: 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 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: 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 CH1CTL1 CH2VOUT1 CH1CTL2 CH2VOUT2 CH3IOUT1 CH4Iin CH3IOUT2 CH4Iin VBAT=4.2V VBAT=3.8V CH1CTL CH2VOUT1 CH2VOUT1 CH3IOUT1 CH3VOUT2 CH4VOUT3 VBAT=3.8V VBAT=3.8V CH2VOUT2 CH3IOUT2 CH2VOUT3 CH3IOUT3 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 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: 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 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: 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 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 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 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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). 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. 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: 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 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 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 3C/second max. 3C/second max. 100C 150C 60-120 seconds 150C 200C 60-180 seconds - 3C/second max. 183C 60-150 seconds 217C 60-150 seconds 225+0/-5C 240+0/-5C 245+0/-5C 250+0/-5C 10-30 seconds 10-30 seconds 10-30 seconds 20-40 seconds 6C/second max. 3C/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: service@aimtron.com.tw 21