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. 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 3/15/2006 REV:1.1 Email:[email protected] 1 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Pin Configuration Ordering Information Part number AT1391P AT1391P_GRE Package TSSOP8 TSSOP8, Green Marking AT1391P AT1391P, date code with one bottom line *For more marking information, contact our sales representative directly 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) Descript SS FB 5 6 COMP OUT 7 8 Sotf-start Error amplifier inverting input Error amplifier output Output for Pch-MOSFET 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 3/15/2006 REV:1.1 Email:[email protected] 2 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Absolute Maximum Ratings*1 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 ESD Susceptibility *2 Condition — — — — — — TSSOP8（Ta=+25℃） — — HBM MM Rated Value Min. Max. +7 -50 50 -200 200 6.5 500 -30 +85 -55 +125 2 200 Unit V mA mA mA mA V mW 0 C 0 C KV V 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. 2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitor discharged through a 1.5KΩ resistor into each pin 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 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 3/15/2006 REV:1.1 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 Frequency Sawtooth wave oscillator (OSC) Soft-Start Short-Circuit 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 2.5 -1.0 160 Ta =-20℃ to +85℃ fT 10.0 0.2 VCOM AV 500 fosc 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 % 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 3/15/2006 REV:1.1 Email:[email protected] 4 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Output Block 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 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 3/15/2006 REV:1.1 Email:[email protected] 5 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller 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 3/15/2006 REV:1.1 Email:[email protected] 6 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller 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 3/15/2006 REV:1.1 Email:[email protected] 7 AT1391 Preliminary Product Information 1-Channel Step-Down 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 - 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 3/15/2006 REV:1.1 Email:[email protected] 8 AT1391 Preliminary Product Information 1-Channel Step-Down PWM Controller Reflow Condition (IR/Convection or VPR Reflow) Classification Reflow Profiles Profile Feature Average ramp-up rate (TL to TP) Sn-Pb Eutectic Assembly 3°C/second max. Pb-Free Assembly 3°C/second max. 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds 183°C 60-150 seconds 217°C 60-150 seconds See table 1 10-30 seconds See table 2 10 seconds max. 6°C/second max. 6 minutes max. 6°C/second max. 8 minutes max. Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Time maintained above: -Temperature (TL) -Time (tL) Peak/Classification Temperature(TP) Time within 5°C of actual Peak Temperature (tP) Ramp-down Rate Time 25°C to Peak Temperature *All temperatures refer to topside of the package, measured on the package body surface. Classification Reflow Profiles(Cont.) Table 1. SnPb Entectic Process –Package Peak Reflow Temperatures Package Thickness <2.5mm ≥2.5mm 3 Volume mm <350 240+0/-5℃ 225+0/-5℃ Volume mm3≥350 225+0/-5℃ 225+0/-5℃ Table 2. Pb-free Process –Package Classification Reflow Temperatures Package Thickness <1.6mm 1.6mm - 2.5mm ≥2.5mm 3 Volume mm <350 260+0℃ 260+0℃ 250+0℃ Volume mm3 350-2000 260+0℃ 250+0℃ 245+0℃ Volume mm3>2000 260+0℃ 245+0℃ 245+0℃ *Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0˚С. For example 260˚С+0˚С) at the rated MSL level. 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 3/15/2006 REV:1.1 Email:[email protected] 9