AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Features General Description • High efficiency • Using external P channel MOSFET • Maximum Duty 100% • Oscillation frequency 600KHz • Soft Start by an external capacity • Output voltage accuracy ±2% • Built-in ON/OFF Function • Built-in Short-circuit Protection • Stand-by current max. 10µA • Quiescent Current 1mA • Input voltage: 2.5V ~7.0V The AT1391 provides complete control and protection for a DC/DC converter optimized for high-performance microprocessor applications. It is designed to drive one P-Channel in a buck topology. The AT1391 integrates all of the control, output adjustment, and protection functions into a single package. The output voltage of the converter can be precisely regulated with a maximum tolerance of ±2% over temperature and line voltage variations. The AT1391 is a family of low-noise step-down DC/DC converters that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 3-cell to 4-cell NiCd, NiMH, or alkaline battery. It can also be used to USB-Based power system. Applications • Power Supply for portable devices 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: [email protected] 1 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Pin Configuration Ordering Information Part number AT1391 Package TSSOP8 Marking AT1391P Pin Description Symbol Pin No. GND VCC 1 2 SCP CTL 3 4 Descript Control blocks ground Power blocks power supply Short-Circuit protection Chip enable, high active Symbol Pin No.(A/B) SS FB 5 6 COMP OUT 7 8 Descript Sotf-start Error amplifier inverting input Error amplifier output Output for Pch-MOSFET 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: [email protected] 2 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Absolute Maximum Ratings Parameter Power Supply Voltage Source Average Current of OUT Sink Average Current of OUT Source Peak Current of OUT Sink Peak Current of OUT Input Voltage to Error Amplifier Continuous power dissipation Operating temperature Storage temperature Condition — — — — — — TSSOP8（Ta=+25℃） — — Rated Value Min. Max. +7 -50 50 -200 200 6.5 500 -30 +85 -55 +125 Unit V mA mA mA mA V mW 0 C 0 C 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. Recommended Operating Conditions (Ta=+250C) Parameter Power supply voltage Control input voltage Operating temperature Symbol VCC VCTL TOP Values Min. 2.5 0 -20 Typ. --+25 Unit Max. 6 6 +85 Ｖ V °C 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: [email protected] 3 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Electrical Characteristics (VCC = 5V,Ta =+25℃ , unless otherwise noted. ) Parameter Symbol Condition Values Unit Min. Typ. Max. Input Supply Range VCC Quiescent Current ICC Current in standby mode IST Entire device Reference Voltage VREF Reference Voltage line-regulation VREF-Line Error amplifier Sawtooth wave oscillator (OSC) Soft-Start Short-Circuit Output Block Duty=50%, fOSC=600KHz PDRV/NDRV No Load CTL=0V Ta =-20℃ to +85℃ VIO IOH IOL 6.0 V 1.0 1.5 mA 10 µA V 1 5 mV 0.5 1.5 % 1.0 1.5 -160 -120 10 2.0 -80 mV mA μA 20 % 20 % VCC=2.5V to 6.0V VCOMP = VREF –0.5V VCOMP = 0.5V Ta =-20℃ to +85℃ -- 1.20 1.22 1.24 Ta =-20℃ to +85℃ Rference Variation with Temperature Input Offset Voltage Source Current Sink Current Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth Common Mode Input Voltage Range DC Open Loop Gain Frequency 2.5 Ta =-20℃ to +85℃ fT 10.0 VCOM 0.2 AV fosc 500 MHz 1.5 110 600 V dB 700 KHz High Level Voltage 1.0 V Low Level Voltage Variation with Power Supply Variation with temperature Charge Current of SS Invalid threshold voltage of SS Charge Current of SS Threshold Voltage of SCP 0.5 V Output source current Vcc=2.5V to 6V 2 Ta =-20℃ to +85℃ 7 Isource Duty≥95% OUT=0V % -1.0 µA 1.0 V -1.5 -1.25 -1.0 µA 0.8 0.9 1.0 V - -130 -80 mA ICSS ICSCP % 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: [email protected] 4 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Output sink current Output ON resistor Control Block CTL input voltage CTL input Current Isink Duty≤5% OUT=5V ROH OUT=-15mA 18 30 Ω ROL OUT=15mA 16 25 Ω VIH Active mode 2.0 VCC V VIL Standby mode 0 0.5 V ICTL CTL=5.0V 20 µA 65 100 mA Application Circuit 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: [email protected] 5 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller 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: [email protected] 6 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller 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: [email protected] 7 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Small 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 - 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: [email protected] 8 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Reflow Condition (IR/Convection or VPR Reflow) Reference JEDEC Standard J-STD-020A Classification Reflow Profiles Convection or IR/Convction Average Heating Rate(180°C to peak) 5°C/second max. 120 seconds max. Preheat Temperature(125±20°C) 10~150 seconds Temperature maintained above 180°C Time within 5°C of actual Peak 10~20 seconds Temperature Peak Temperature Range(Note 1) 219~225°C or 235~240°C Cooling Rate 6°C /second max. 6 minutes max. Time 25°C to Peak Temperature VPR 10°C/second max. 60 seconds 219~225°C or 235~240°C 10°C/second max. *1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions. Package Reflow Conditions Pkg. Thickness ≥2.5mm Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm and and and all bags Pkg. Volume ≥350 mm3 Pkg. Volume <350 mm3 Convection 219~225°C VPR 219~225°C IR/Convection 219~225°C Convection 235~240°C VPR 235~240°C IR/Convection 235~240°C 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: [email protected] 9