AT1305

AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Features • 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 General Description 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: 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_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 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 AT1305:LDO set to 3.3V 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 Description 1 2 3 4 5 6 7 8 LX EN /ENPB GND PG FB OUT VDD O I I O I O - 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: service@aimtron.com.tw 2 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Absolute Maximum Ratings*1 (Ta=+250C) Parameter Power supply voltage LX pin voltage OUT output voltage Other I/O pin voltage LX pin output current LDO output Peak Current Allowable dissipation Operating temperature Storage temperature Symbol VDD VLX VOUT ILX ILDO PD TOP Tstg Condition — — — — — — TSSOP8 — — Rated Value Min. Max. — 6.0 — — — — — — -30 -55 6.0 6.0 6.0 2 400 500 +85 +165 Unit V V V V A mA mW 0 0 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 (VIN=1.0V, VOUT =2.8V, IOUT=0mA ,Ta=+250C) Parameter Symbol Condition Min. Values Typ. 0.8 2 Max. 5.5 5.5 87 32 1 1.2 1.75 50 10 1.224 50 - Unit Start-Up Voltage Power On Reset Threshold Operating V DD Range No-Load Input Current Switch- Off Input Current Shutdown Current Feedback Reference FB Input Current LX Switch On-time VST VDD VDD IIN1 IIN2 IIN3 VFB IFB FS IOUT=1mA 0.7 - V V V V μA μA μA V nA μS AT1305,AT1305A AT1305B IOUT=0mA VIN=5V EN=0V, /ENPB=High Close Loop VDD =2.85V VFB =1.2V VOUT =2.85V 2.0 1.65 1.176 - 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: service@aimtron.com.tw 3 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Maximum Duty LX ON Resistance LX Leakage Current Current Limit Setting LDO Current Limit OUT ON Resistance LDO enable threshold LDO Line Regulation LDO Load Regulation PG Threshold PG sink current PG Leakage current EN,/ENPB Trip Level VDD2 IPG ILPG VIH VIL DMAX RLX IL ILX ILDO ROUT VDD1 VOUT =2.85V N-Channel VLX =1.5V, EN=0V,/ENPB=VDD VDD =2.85V VDD =3.2V VDD =2.85V, IOUT=100mA OUT regulated to 1.8/3.0/3.3V Vin=4.5V~5.5V, IOUT=100mA Vout=3.3V, IOUT=10~100mA AT1305,AT1305A, falling AT1305B, VDD falling IPG=1mA VDD =3V VDD 0.8 1.5 350 0.5 4.0 1 1 2.7 1.65 0.4 85 0.3 1 2 1 0.5 % Ω μA A mA Ω V % % V V V μA V V 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: service@aimtron.com.tw 4 AT1305 Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Operating Charateristics Boost Converter Line Transient Response Boost Converter Line Transient Response Boost Converter Load 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 L=33uH VDD=2.91V Iout=100mA 1.1 1.2 1.3 1.4 1.5 Vin(V) 0.9 1.0 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: service@aimtron.com.tw 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 L=33uH VDD=3.3V Iout=100mA 2.0 2.2 2.4 2.6 2.8 3.0 Vin(V) 1.8 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: service@aimtron.com.tw 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 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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