AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Features General Description • 0.8V Low Start-Up Input Voltage • Up to 90%Efficiency • Adjustable 100mA Output with 1 Alkaline Cell or 200mA Output with 2 Alkaline Cell Battery input. • 1.8V/3.0V/3.3V/300mA Output with USB Power input. • Small Number of External Components needed • Load Disconnects from Input in Shutdown • Power good output • 32µA Quiescent(Switch OFF) Supply current • 1µA 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 or 2 Cell Alkaline battery and USB applications. Besides, the 32µA 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 • MP3 • 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. 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 2/8/2006 REV:1.1 Email: [email protected] 1 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Pin Configuration Ordering Information Part number AT1305 AT1305_GRE AT1305 A AT1305 A_GRE AT1305 B AT1305 B_GRE Package 8-pin Plastic TSSOP 8-pin Plastic TSSOP, Green 8-pin Plastic TSSOP 8-pin Plastic TSSOP, Green 8-pin Plastic TSSOP 8-pin Plastic TSSOP, Green AT1305:LDO set to 3.3V Remarks Date Code ,Date Code with one bottom line Date Code ,Date Code with one bottom line Date Code ,Date Code with one bottom line AT1305AP:LDO set to 3.0V AT1305BP:LDO set to 1.8V *For more marking information, contact our sales representative directly 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 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 2/8/2006 REV:1.1 Email: [email protected] 2 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Absolute Maximum Ratings*1 (Ta=+250C) Parameter Symbol Condition Power supply voltage VDD — LX pin voltage VLX — — 6.0 V OUT output voltage VOUT — — 6.0 V — — 6.0 V — — 2 A Other I/O pin voltage LX pin output current ILX LDO output Peak Current Rated Value Min. Max. — 6.0 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 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. Electrical Characteristics Parameter (VIN=1.0V, VOUT =2.8V, IOUT=0mA ,Ta=+250C) Symbol Values Condition Unit Min. Typ. Max. 0.7 0.8 - V - 2 - V AT1305,AT1305A 2.0 - 5.5 V AT1305B 1.65 5.5 V IIN1 IOUT=0mA - 87 - μA IIN2 VIN=5V - 32 50 μA Shutdown Current IIN3 EN=0V, /ENPB=High - 1 10 μA Feedback Reference VFB Close Loop VDD =2.85V 1.176 1.2 1.224 V FB Input Current IFB VFB =1.2V - - 50 nA LX Switch On-time FS VOUT =2.85V - 1.75 - μS Start-Up Voltage VST Power On Reset Threshold VDD Operating V DD Range VDD No-Load Input Current Switch- Off Input Current IOUT=1mA 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 2/8/2006 REV:1.1 Email: [email protected] 3 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Maximum Duty LX ON Resistance DMAX RLX VOUT =2.85V - 85 - % N-Channel - 0.3 - Ω 1 μA LX Leakage Current IL VLX =1.5V, EN=0V,/ENPB=VDD - Current Limit Setting ILX VDD =2.85V - 1.5 2 A LDO Current Limit ILDO VDD =3.2V - 350 - mA OUT ON Resistance ROUT VDD =2.85V, IOUT=100mA - 0.5 - Ω LDO enable threshold VDD1 - 4.0 - V - 1 - % Vout=3.3V, IOUT=10~100mA - 1 - % AT1305,AT1305A, falling - 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 VDD PG sink current IPG IPG=1mA - 0.4 - V PG Leakage current ILPG VDD =3V - - 1 μA VIH 0.8 - - V VIL - - 0.5 V EN,/ENPB Trip Level Note 1 : Once the output is in regulation , the AT1305/A/B operate down to a 0.7V input voltage. 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 2/8/2006 REV:1.1 Email: [email protected] 4 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Operating Charateristics Boost Converter Line Transient Response Boost Converter Load Transient Response Boost Converter Line Transient Response Boost Converter Load Transient Response 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 2/8/2006 REV:1.1 Email: [email protected] 5 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO LDO Line Transient Response LDO Load Transient Response Boost Converter Start-up After Enable 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 2/8/2006 REV:1.1 Email: [email protected] 6 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Application Circuit 1Cell And USB Power Input 1Cell or USB Power Input 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 2/8/2006 REV:1.1 Email: [email protected] 7 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Operating Charateristics 1Cell and USB Power Input Efficiency (Load at LDO output) 90 85 80 75 70 0 0.9 1.0 L=33uH VDD=2.91V Iout=100mA 1.1 1.2 1.3 1.4 1.5 Vin(V) 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 2/8/2006 REV:1.1 Email: [email protected] 8 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 2Cell And USB Power Input Efficiency (Load at LDO output) 95 90 85 80 75 0 1.8 L=33uH VDD=3.3V Iout=100mA 2.0 2.2 2.4 2.6 2.8 3.0 Vin(V) 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 2/8/2006 REV:1.1 Email: [email protected] 9 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 1.4µs 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 + R2 R1 = 1.2 × (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. 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 2/8/2006 REV:1.1 Email: [email protected] 10 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 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 2/8/2006 REV:1.1 Email: [email protected] 11 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Package Outline : 8-pin TSSOP SYMBOL A B C D E F H K M α 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 80 00 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 - 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 2/8/2006 REV:1.1 Email: [email protected] 12 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 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 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 3°C/second max. 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. 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 10-30 seconds 240+0/-5°C 10-30 seconds 6°C/second max. 6 minutes max. 245+0/-5°C 10-30 seconds 250+0/-5°C 20-40 seconds 3°C/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 2/8/2006 REV:1.1 Email: [email protected] 13