AT1392 Preliminary Product Information 1-Channel Synchronous Buck PWM Controller Features General Description • High efficiency • Using external P and N channel MOSFET • Maximum Duty 100% • Oscillation frequency 600KHz • Soft Start by an external capacity • Output voltage accuracy ±2% • Built-in ON/OFF Function • Stand-by current max. 10µA • Quiescent Current 1mA • Input voltage: 2.5V ~7.0V The AT1392 provides complete control and protection for a DC/DC converter optimized for high-performance microprocessor applications. It is designed to drive one P-Channel and one NChannel in a buck topology. The AT1392 integrates all of the control, output adjustment 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 AT1392 is a family of low-noise synchronous step-down DC/DC converters that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 3cell 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck PWM Controller Pin Configuration Ordering Information Part number AT1392P AT1392P_GRE Package TSSOP8 TSSOP8, Green Marking AT1392P AT1392P, date code with one bottom line Pin Description Symbol Pin No. Descript OUTN AGND 1 2 Output for Nch-MOSFET Power Ground VCC CTL 3 4 Power Supply ON-OFF Control Symbol Pin No.(A/B) SS FB 5 6 COMP OUTP 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck 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 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 % -1.5 120 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 -1.0 160 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 0.5 V Vcc=2.5V to 6V 2 Ta =-20℃ to +85℃ 7 ICSS % % -1.0 µA 1.0 V Output source current Isource Duty≥95% OUT=0V - -130 Output sink current Isink Duty≤5% OUT=5V 65 100 ROH OUT=-15mA 18 30 Ω ROL OUT=15mA 16 25 Ω Output ON resistor -80 mA mA 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck PWM Controller Control Block CTL input voltage CTL input Current VIH Active mode VIL Standby mode ICTL CTL=5.0V 2.0 VCC V 0 0.5 V 20 µA 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck 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 AT1392 Preliminary Product Information 1-Channel Synchronous Buck PWM Controller Small Outline SYMBOL A B C D E F H K M α 8-pin TSSOP 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