E-L6917BD, E-L6917BDTR, L6917B, L6917BD, L6917BDTR

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L6917B
5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER
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 COMPLIANT WITH VRM 9.0 0.8% INTERNAL REFERENCE 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 300 kHz INTERNAL OSCILLATOR OSCILLATOR EXTERNALLY ADJUSTABLE UP TO 600kHz POWER GOOD OUTPUT AND INHIBIT FUNCTION REMOTE SENSE BUFFER PACKAGE: SO-28

SO-28 ORDERING NUMBERS:L6917BD L6917BDTR (Tape & Reel)

APPLICATIONS s POWER SUPPLY FOR SERVERS AND WORKSTATIONS s POWER SUPPLY FOR HIGH CURRENT MICROPROCESSORS s DISTRIBUTED DC-DC CONVERTERS BLOCK DIAGRAM
ROSC / INH

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 1.100V to 1.850V with 25mV binary steps. The high precision internal reference assures the selected output voltage to be within 0.8%. 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.

SGND

VCCDR BOOT1

LOGIC PWM ADAPTIVE ANTI CROSS-CONDUCTION

PGOOD
2 PHASE OSCILLATOR PWM1

UGATE1 HS PHASE1

CURRENT CORRECTION

+

DIGITAL SOFT START

CH 1 OVER CURRENT

LGATE1 LS ISEN1

VCC VCCDR LOGIC AND PROTECTIONS

TOTAL CURRENT

+
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CURRENT READING

PGNDS1 PGND

VID4 VID3 VID2 VID1 VID0
CH1 OVER CURRENT AVG CURRENT

DAC
CH2 OVER CURRENT

CURRENT READING

PGNDS2

ISEN2 LOGIC PWM ADAPTIVE ANTI CROSS-CONDUCTION
CH 2 OVER CURRENT

LGATE2 LS

10k 10k 10k REMOTE BUFFER

+
IFB

FBG FBR

CURRENT CORRECTION

ERROR AMPLIFIER

PHASE2

PWM2

UGATE2 HS

10k

Vcc

BOOT2

VSEN

FB

COMP

Vcc

September 2002

1/33

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E-L6917BD DATASHEET