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L6919ETR Datasheet(PDF) 1 Page - STMicroelectronics |
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L6919ETR Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 33 page 1/33 L6919E September 2003 s 2 PHASE OPERATION WITH SYNCRHONOUS RECTIFIER CONTROL s ULTRA FAST LOAD TRANSIENT RESPONSE s INTEGRATED HIGH CURRENT GATE DRIVERS: UP TO 2A GATE CURRENT s TTL-COMPATIBLE 5 BIT PROGRAMMABLE OUTPUT FROM 0.800V TO 1.550V WITH 25mV STEPS s DYNAMIC VID MANAGEMENT s 0.6% OUTPUT VOLTAGE ACCURACY s 10% ACTIVE CURRENT SHARING ACCURACY s DIGITAL 2048 STEP SOFT-START s OVERVOLTAGE PROTECTION s OVERCURRENT PROTECTION REALIZED USING THE LOWER MOSFET'S RdsON OR A SENSE RESISTOR s OSCILLATOR EXTERNALLY ADJUSTABLE AND INTERNALLY FIXED AT 200kHz s POWER GOOD OUTPUT AND INHIBIT FUNCTION s REMOTE SENSE BUFFER s PACKAGE: SO-28 APPLICATIONS s POWER SUPPLY FOR SERVERS AND WORKSTATIONS s POWER SUPPLY FOR HIGH CURRENT MICROPROCESSORS s DISTRIBUTED POWER SUPPLY DESCRIPTION The device is a power supply controller specifically designed to provide a high performance DC/DC conversion for high current microprocessors. The device implements a dual-phase step-down con- troller with a 180° phase-shift between each phase. A precise 5-bit digital to analog converter (DAC) allows adjusting the output voltage from 0.800V to 1.550V with 25mV binary steps manag- ing On-The-Fly VID code changes. The high precision internal reference assures the selected output voltage to be within ±0.6%. The high peak current gate drive affords to have fast switching to the external power mos providing low switching losses. The device assures a fast protection against load over current and load over/under voltage. An inter- nal crowbar is provided turning on the low side mosfet if an over-voltage is detected. In case of over-current, the system works in Constant Cur- rent mode. SO-28 ORDERING NUMBERS:L6919E L6919ETR 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT BLOCK DIAGRAM CUR REN T REA D IN G I FB TO TAL CUR REN T CH1 OC P DA C DIGIT AL SOFT- START CH1 OCP PW M1 ERR OR AMPL IF IER REMO TE BU FFE R 32k 32k 32k LS LS HS Vc c HS BOO T 1 U GA T E1 PHAS E1 LGAT E1 ISE N1 PGN DS1 PGN D PGN DS2 ISE N2 LGAT E2 PHAS E2 UGAT E2 BOO T 2 Vc c COM P FB VS EN FB G FB R VID 0 VID 1 VID 2 VID 3 VID 4 PGOOD OS C / I NH S GN D VCCD R 32k VCC DR VCC CH 2 OC P PW M2 CH2 OC P CUR REN T REA D IN G CUR REN T REA D IN G CUR REN T REA D IN G I FB TO TAL CUR REN T CH1 OC P DA C DIGIT AL SOFT- START CH1 OCP PW M1 ERR OR AMPL IF IER REMO TE BU FFE R 32k 32k 32k LS LS HS Vc c HS BOO T 1 U GA T E1 PHAS E1 LGAT E1 ISE N1 PGN DS1 PGN D PGN DS2 ISE N2 LGAT E2 PHAS E2 UGAT E2 BOO T 2 Vc c COM P FB VS EN FB G FB R VID 0 VID 1 VID 2 VID 3 VID 4 PGOOD OS C / I NH S GN D VCCD R 32k VCC DR VCC CH 2 OC P PW M2 CH2 OC P CUR REN T REA D IN G CUR REN T REA D IN G |
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