AT1392 ETC1 | Alldatasheet

Document overview

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Technical content

Features

  • 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

Applications

  • Power Supply for portable devices General Description The AT1392 provides complete control and protection for a DC/DC converter optimized for high-performance micropro cessor applications. It is designed to drive one P-Channel and one N- Channel 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 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 Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Pin Configuration

Ordering Information

Part number Package Marking AT1392P TSSOP8 AT1392P AT1392P_GRE TSSOP8, Green AT1392P, date code with one bottom line Pin Description Symbol Pin No. Descript Symbol Pin No.(A/B) Descript OUTN 1 Output for Nch-MOSFET SS 5S o t f - S t a r t AGND 2 Power Ground FB 6 Error amplifier inverting input VCC 3 Power Supply COMP 7 Error amplifier output CTL 4O N - O F F C o n t r o l OUTP 8 Output for Pch-MOSFET

Preliminary Product Information 1- Channel Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Absolute Maximum Ratings Rated ValueParameter Condition Min. Max. Unit Power Supply V oltage — - +7 V Source Average Current of OUT — - -50 mA Sink Average Current of OUT — - 50 mA Source Peak Current of OUT — - -200 mA Sink Peak Current of OUT — - 200 mA Input V oltage to Error Amplifier — - 6.5 V Continuous power dissipation TSSOP8（Ta=+25℃） -5 0 0m W Operating temperature — -30 +85 0C Storage temperature — -55 +125 0C 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 specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended Operating Conditions (Ta=+250C) ValuesParameter Symbol Min. Typ. Max. Unit Power supply voltage V CC 2.5 -- 6 Ｖ Control input voltage V CTL 0- -6 V Operating temperature T OP -20 +25 +85 °C

Preliminary Product Information 1- Channel Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

Electrical Characteristics

(VCC = 5V,Ta =+25℃ , unless otherwise noted. ) ValuesParameter Symbol Condition Min. Typ. Max. Unit Input Supply Range V CC 2.5 -- 6.0 V Quiescent Current I CC Duty=50%, fOSC=600KHz PDRV/NDRV No Load 1.0 1.5 mA Current in standby mode I ST CTL=0V 10 µA Reference Voltage V REF Ta =-20℃ to +85 ℃ 1.20 1.22 1.24 V Reference Voltage line-regulation VREF-Line VCC=2.5V to 6.0V 15 m V Entire device Rference Variation with Temperature Ta =-20℃ to +85 ℃ 0.5 1.5 % Input Offset V oltage V IO 10 mV Source Current I OH VCOMP = VREF –0.5V -1.0 -1.5 -2.0 mA Sink Current I OL VCOMP = 0.5V 160 120 80 μA Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth f T 10.0 MHz Common Mode Input Voltage Range VCOM 0.2 1.5 V Error amplifier DC Open Loop Gain A V 110 dB Frequency fosc 500 600 700 KHz High Level Voltage 1.0 V Low Level Voltage 0.5 V Variation with Power Supply Vcc=2.5V to 6V 2 % Sawtooth wave oscillator (OSC) Variation with temperature Charge Current of SS ICSS -1.0 µA Soft-Start Invalid threshold voltage of SS 1.0 V Output source current I source Duty≥95% OUT=0V - -130 -80 mA Output sink current I sink Duty≤5% OUT=5V 65 100 mA ROH OUT=-15mA 18 30 Ω Output Block Output ON resistor ROL OUT=15mA 16 25 Ω

Preliminary Product Information 1- Channel Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw VIH Active mode 2.0 VCC V CTL input voltage VIL Standby mode 00 . 5 VControl Block CTL input Current I CTL CTL=5.0V 20 µA Application Circuit

Preliminary Product Information 1- Channel Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

Preliminary Product Information 1- Channel Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

Preliminary Product Information 1- Channel Synchronous Buck PWM Controller Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Small Outline 8-pin TSSOP INCHES MILLIMETERSSYMBOL 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 00 80 00 80 -