AT1391 AIMTRON | Alldatasheet

Document overview

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Technical content

Features

  • 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

Applications

  • Power Supply for portable devices General Description 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. Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications.

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:service@aimtron.com.tw Pin Configuration

Ordering Information

AT1391P_GRE TSSOP8, Green AT1391P, date code with one bottom line *For more marking information, contact our sales representative directly Pin Description Symbol Pin No. Descript Symbol Pin No.(A/B) Descript GND Control blocks ground SS Sotf-start VCC Power blocks power supply FB Error amplifier inverting input SCP Short-Circuit protection COMP Error amplifier output CTL Chip enable, high active OUT Output for Pch-MOSFET

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:service@aimtron.com.tw Absolute Maximum Ratings*1 Rated Value Parameter Condition Min. Max. Unit Power Supply Voltage V Source Average Current of OUT -50 mA Sink Average Current of OUT mA Source Peak Current of OUT -200 mA Sink Peak Current of OUT 200 mA Input Voltage to Error Amplifier 6.5 V Continuous power dissipation TSSOP8（Ta=+25℃） 500 mW Operating temperature -30 +85 Storage temperature -55 +125 HBM KV ESD Susceptibility *2 MM 200 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) Values Parameter Symbol Min. Typ. Max. Unit Power supply voltage VCC 2.5 Ｖ Control input voltage VCTL V Operating temperature TOP -20 +25 +85

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:service@aimtron.com.tw

Electrical Characteristics

(VCC = 5V,Ta =+25℃ , unless otherwise noted. ) Values Parameter Symbol Condition Min. Typ. Max. Unit Input Supply Range VCC 2.5 6.0 V Quiescent Current ICC Duty=50%, fOSC=600KHz PDRV/NDRV No Load 1.0 1.5 mA Current in standby mode IST CTL=0V µA Reference Voltage VREF Ta =-20℃ to +85℃ 1.20 1.22 1.24 V Reference Voltage line-regulation VREF-Line VCC=2.5V to 6.0V mV Entire device Rference Variation with Temperature Ta =-20℃ to +85℃ 0.5 1.5 Input Offset Voltage VIO mV Source Current IOH VCOMP = VREF –0.5V -1.0 -1.5 -2.0 mA Sink Current IOL VCOMP = 0.5V 160 120 μA Source current Variation with temperature Ta =-20℃ to +85℃ Sink current Variation with temperature Ta =-20℃ to +85℃ Unity Gain Bandwidth fT 10.0 MHz Common Mode Input Voltage Range VCOM 0.2 1.5 V Error amplifier DC Open Loop Gain AV 110 dB Frequency fosc 500 600

700 KHz

1.0 V Low Level Voltage 0.5 V Variation with Power Supply Vcc=2.5V to 6V Sawtooth wave oscillator (OSC) Variation with temperature Ta =-20℃ to +85℃ Charge Current of SS ICSS -1.0 µA Soft-Start Invalid threshold voltage of SS 1.0 V Charge Current of SS ICSCP -1.5 -1.25 -1.0 µA Short-Circuit Threshold Voltage of SCP 0.8 0.9 1.0 V Output source current Isource Duty≥95% OUT=0V -130 -80 mA

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:service@aimtron.com.tw Output sink current Isink Duty≤5% OUT=5V 100 mA ROH OUT=-15mA Ω Output Block Output ON resistor ROL OUT=15mA Ω VIH Active mode 2.0 VCC V CTL input voltage VIL Standby mode 0.5 V Control Block CTL input Current ICTL CTL=5.0V µA Application Circuit

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:service@aimtron.com.tw

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:service@aimtron.com.tw

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:service@aimtron.com.tw Small Outline 8-pin TSSOP INCHES MILLIMETERS SYMBOL MIN MAX MIN MAX NOTES A 0.114 0.122 2.90 3.10 B 0.169 0.177 4.30 4.50 C 0.244 0.260 6.20 6.60 D

0.026 BSC

0.65 BSC

E 0.010 0.012 0.25 0.30 F 0.002 0.006 0.05 0.15 H 0.041 0.047 1.05 1.20 K

0.005 BSC

0.127 BSC

M 0.020 0.028 0.50 0.70 α

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. *All temperatures refer to topside of the package, measured on the package body surface. Table 1. SnPb Entectic Process –Package Peak Reflow Temperatures Table 2. Pb-free Process –Package Classification Reflow Temperatures example 260˚С+0˚С) at the rated MSL level.