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E-L6919E| Datasheet

By datasheet - April 3rd, 2008

E-L6919E, E-L6919ETR, L6919E, L6919ETR

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L6919E
5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
s s s s

s s s s s s

s s s s

2 PHASE OPERATION WITH SYNCRHONOUS RECTIFIER CONTROL ULTRA FAST LOAD TRANSIENT RESPONSE INTEGRATED HIGH CURRENT GATE DRIVERS: UP TO 2A GATE CURRENT TTL-COMPATIBLE 5 BIT PROGRAMMABLE OUTPUT FROM 0.800V TO 1.550V WITH 25mV STEPS DYNAMIC VID MANAGEMENT 0.6% OUTPUT VOLTAGE ACCURACY 10% ACTIVE CURRENT SHARING ACCURACY DIGITAL 2048 STEP SOFT-START OVERVOLTAGE PROTECTION OVERCURRENT PROTECTION REALIZED USING THE LOWER MOSFET'S R dsON OR A SENSE RESISTOR OSCILLATOR EXTERNALLY ADJUSTABLE AND INTERNALLY FIXED AT 200kHz POWER GOOD OUTPUT AND INHIBIT FUNCTION REMOTE SENSE BUFFER PACKAGE: SO-28

SO-28 ORDERING NUMBERS:L6919E L6919ETR

APPLICATIONS s POWER SUPPLY FOR SERVERS AND WORKSTATIONS s POWER SUPPLY FOR HIGH CURRENT MICROPROCESSORS s DISTRIBUTED POWER SUPPLY BLOCK DIAGRAM
O S C / I NH S GN D

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 controller 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 managing 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 internal 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 Current mode.

VC C D R BOO T 1

2 P H AS E O S C IL L ATOR

L O G IC PW M

PW M1

A DA PTIV E A NT I CRO SS CO ND UCT IO N

PGO O D

HS

U T E1 GA

PHAS E1

C U RR EN T COR R EC TI ON

DIGIT AL SOFT- START

LOGIC AN D P ROTE CTION S

CH1 O CP

LS

L GAT E1 ISE N1

V CC V CC DR TO TAL C UR REN T C U R R EN T AV G

CUR REN T REA DIN G

PGN DS1 PGN D

VID 4 VID 3 VID 2 VID 1 VID 0

D AC
CH 2 OC P C H1 OCP

CUR REN T REA DIN G

PGN DS2 ISE N2

CU R R EN T C OR R EC TI ON

32k 3 2k I FB

CH2 O CP

FB G FB R

LO G IC PW M A DA PT IV E A N T I CRO SS CO N DU CT IO N

LS

L GAT E2

PHAS E2

3 2k

PW M2

HS

32k

R EMO TE BU FFE R
ERR OR A MPL IF IER

U GA T E2

Vc c

BOO T 2

V S EN

FB

COM P

V cc

September 2003

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