AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Features General Description * Start-Up from 1.0V * Adjustable 100mA Output with 1 or 2-cell Battery input. * 1.8V/3.0V/3.3V/250mA Output with USB Power input. * Small Number of External Components needed * Load Disconnects from Input in Shutdown * Power good output * 32PA Quiescent(Switch OFF) Supply current * 1PA Shutdown Mode Supply current * 8-Pin TSSOP package The AT1305 is a PFM step-up DC/DC converter with LDO for applications using 1 cell battery and USB applications. Besides, the 32PA low quiescent current together with high efficiency maintains long battery life time. It provides a constant output voltage for inputs that vary above and below the output voltage. Applications * Power source for battery-powered equipment * Power source for cameras, camcorders, VCRs, PDAs, electronic data banks, and hand-held Communication equipment Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Pin Configuration Ordering Information Part number AT1305 AT1305 A AT1305 B Package 8-pin Plastic TSSOP 8-pin Plastic TSSOP 8-pin Plastic TSSOP AT1305:LDO set to 3.3V Marking AT1305P AT1305AP AT1305BP AT1305AP:LDO set to 3.0V AT1305BP:LDO set to 1.8V Pin Description Pin No. Symbol I/O 1 2 3 4 5 6 7 8 LX EN /ENPB GND PG FB OUT VDD O I I O I O - Description Switching Output Enable Control Input, active high Enable Control Input, active low Ground Power Good Detected Step-Up Converter feedback input Output Power input 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 2 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Absolute Maximum Ratings (Ta=+250C) Parameter Symbol Condition Power supply voltage VDD -- LX pin voltage VLX -- -- 6.5 V OUT output voltage VOUT -- -- 6.5 V -- -- 6.5 V -- -- 2.5 A Other I/O pin voltage LX pin output current ILX LDO output Peak Current Rated Value Min. Max. -- 6.5 Unit V ILDO -- -- 400 mA Allowable dissipation PD TSSOP8 -- 500 mW Operating temperature TOP -- -30 +85 0 +165 0 Storage temperature Tstg -- -55 C C WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings. Electrical Characteristics (VIN=1.0V, VOUT =2.8V, IOUT=0mA ,Ta=+250C) Values Parameter Symbol Condition Unit Min. Typ. Max. 0.8 1 - V - 2 - V AT1305,AT1305A 2.0 - 6 V AT1305B 1.6 IIN1 IOUT=0mA - 87 - A IIN2 VIN=6V - 32 50 A Shutdown Current IIN3 EN=0V, /ENPB=High - - 1 A Feedback Reference VFB Close Loop VDD =2.85V 1.176 1.2 1.224 V FB Input Current IFB VFB =1.2V - - 50 nA Constant on time FS VOUT =2.85V - 4.5 - S Maximum Duty DMAX VOUT =2.85V - 85 - % N-Channel - 0.3 - : Start-Up Voltage VST Power On Reset Threshold VDD Operating V DD Range VDD No-Load Input Current Switch- Off Input Current LX ON Resistance RLX IOUT=1mA 6 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 3 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO LX Leakage Current IL VLX =6V, EN=0V,/ENPB=VDD - - 1 A Current Limit Setting ILX VDD =2.85V - 2.5 3 A LDO Current Limit ILDO VDD =3.2V - 350 - mA OUT ON Resistance ROUT VDD =2.85V, IOUT=100mA - 0.5 - : LDO enable threshold VDD1 - 4.0 - V - 1 - % - 1 - % - 2.7 - V AT1305B, VDD falling - 1.65 - V LDO Line Regulation LDO Load Regulation PG Threshold VDD2 OUT regulated to 1.8/3.0/3.3V Vin=4.5V~5.5V, IOUT=100mA Vout=2.85V, IOUT=10~100mA AT1305,AT1305A, falling VDD PG sink current IPG IPG=1mA - 0.4 - V PG Leakage current ILPG VDD =3V - - 1 A VIH 1.2 - - V VIL - - 0.5 V EN,/ENPB Trip Level 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 4 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Function Description Boost Converter The AT1305 integrates a step-up, switch-mode DC/DC converter with a linear regulator to provide step up/down voltage conversion. A pulse frequency modulation (PFM) with a constant on time 4.5us and minimum off-time 1.4us controls the N-channel MOSFET. The linear regulator contains a P-channel MOSFET. In 1-cell or 2-cell battery input ( When VBAT <VOUT), only the step-up regulator is active, and the linear regulator behaves as a pass gate. The output voltage can be adjusted with two external resistors. The formula show as follow equation. R1 * VDD VFB 1 (c) R2 R1 1.2 u (1 ) R2 The maximum efficiency could be 89% over 50mA load range. The AT1305 guarantee starts up as low as 1.0V input. LDO mode The low-dropout linear regulator consists of a reference, an error amplifier and a P-channel MOSFET. In USB mode, when VIN>4V, the linear regulator is active automatically whether the EN and /ENPB is enabled or not. The output voltage is default 3.3V, 3.0V and 1.8V version. Its driving capability is nearly 250mA. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 5 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Power good The PG pin stays high impedance when the dc/dc converter or the LDO output voltage high than 2.7 V, and falling down when the voltage low than 2.6V. It could be used to enable the processor after the push-button start-up. On/Off Control A single pushbutton switch can be used to turn the AT1305 on and off. EN is pulled low (internal) and /ENPB is pulled high when the AT1305 is off. When the switch is pressed, /ENPB is pulled low and the IC turns on. The switch should be on long enough for the processor to exit reset. The controller issues a logic high to EN, which guarantees the IC will stay on regardless of the switch state. EN 0 0 1 1 /ENPB 0 1 0 1 AT1305 ON OFF ON ON 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 6 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Application Schematic 1Cell or USB Power Typical Operating Charateristics 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 7 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 8 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Boost Converter Line Transient Response Vin=1.5V, Vout=2.8V,Iout=50mA Boost Converter Line Transient Response Vin=1.5V, Vout=2.8V,Iout=100mA CH1=Vout , CH4= Iout CH1=Vout , CH4= Iout Boost Converter Load Transient Response Boost Converter Load Transient Response Vin=1.5V, Vout=2.8V,Iout=10~40mA CH1=Vout , CH4= Iout Vin=1.5V, Vout=2.8V,Iout=20~80mA CH1=Vout , CH4= Iout 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 9 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO LDO Line Transient Response LDO Load Transient Response Vin=5V, Vout=3V,Iout=200mA Vin=5V, Vout=3V,Iout=20~180mA CH1=Vout , CH4= Iout CH1=Vout , CH4= Iout Boost Converter Start-up After Enable Vin=1.5V, Vout=2.8V,Iout=1mA CH1=EN , CH2=/ENPB ,CH3=LX, CH4=Vout 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 10 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 1Cell or USB Power 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 11 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 2Cell or USB Power 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 12 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Small Outline 8-pin TSSOP SYMBOL A B C D E F H K M INCHES MIN MAX 0.114 0.122 0.169 0.177 0.244 0.260 0.026 BSC 0.010 0.012 0.002 0.006 0.041 0.047 0.005 BSC 0.020 0.028 00 80 MILLIMETERS MIN MAX 2.90 3.10 4.30 4.50 6.20 6.60 0.65 BSC 0.25 0.30 0.05 0.15 1.05 1.20 0.127 BSC 0.50 0.70 00 80 NOTES - 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 13 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Reflow Condition (IR/Convection or VPR Reflow) Reference JEDEC Standard J-STD-020A Classification Reflow Profiles Convection or IR/Convction Average Heating Rate(180qC to peak) Preheat Temperature(125r20qC) Temperature maintained above 180qC Time within 5qC of actual Peak Temperature Peak Temperature Range(Note 1) Cooling Rate Time 25qC to Peak Temperature 5qC/second max. 120 seconds max. 10~150 seconds 10~20 seconds 219~225qC or 235~240qC 6qC /second max. 6 minutes max. VPR 10qC/second max. 60 seconds 219~225qC or 235~240qC 10qC/second max. *1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions. Package Reflow Conditions Pkg. Thickness t2.5mm and Pkg. Thickness <2.5mm and all bags Pkg. Volume t350 mm3 Pkg. Thickness <2.5mm and Pkg. Volume <350 mm3 Convection 219~225qC VPR 219~225qC IR/Convection 219~225qC Convection 235~240qC VPR 235~240qC IR/Convection 235~240qC 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 14