E-L6911C, L6911C, L6911CTR

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L6911C
5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
s s s

s s

s s s s s s s

OPERATING SUPPLY IC VOLTAGE FROM 5V TO 12V BUSES UP TO 1.3A GATE CURRENT CAPABILITY TTL-COMPATIBLE 5 BIT PROGRAMMABLE OUTPUT COMPLIANT WITH VRM 8.4 : 1.3V TO 2.05V WITH 0.05V BINARY STEPS 2.1V TO 3.5V WITH 0.1V BINARY STEPS VOLTAGE MODE PWM CONTROL EXCELLENT OUTPUT ACCURACY: 1% OVER LINE AND TEMPERATURE VARIATIONS VERY FAST LOAD TRANSIENT RESPONSE: FROM 0% TO 100% DUTY CYCLE POWER GOOD OUTPUT VOLTAGE OVERVOLTAGE PROTECTION AND MONITOR OVERCURRENT PROTECTION REALIZED USING THE UPPER MOSFET'S RdsON 200KHz INTERNAL OSCILLATOR OSCILLATOR EXTERNALLY ADJUSTABLE FROM 50KHz TO 1MHz SOFT START AND INHIBIT FUNCTIONS

SO-20 ORDERING NUMBERS: L6911C L6911CTR (Tape and Reel)

APPLICATIONS s POWER SUPPLY FOR ADVANCED MICROPROCESSOR CORE s DISTRIBUTED POWER SUPPLY s HIGH POWER DC-DC REGULATORS

DESCRIPTION The device is a power supply controller specifically designed to provide a high performance DC/DC conversion for high current microprocessors. A precise 5-bit digital to analog converter (DAC) allows adjusting the output voltage from 1.30V to 2.05V with 50mV binary steps and from 2.10V to 3.50V with 100mV binary steps. The high precision internal reference assures the selected output voltage to be within 1%. 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 overcurrent and load overvoltage. An external SCR is triggered to crowbar the input supply in case of hard over-voltage. An internal crowbar is also provided turning on the low side mosfet as long as the overvoltage is detected. In case of over-current detection, the soft start capacitor is discharged and the system works in HICCUP mode.

BLOCK DIAGRAM
Vcc 5 to 12V Vin 5V to12V

PGOOD SS

VCC

OCSET BOOT

MONITOR and PROTECTION OVP RT

UGATE

OSC

PHASE LGATE PGND

Vo 1.300V to 3.500V

VD0 VD1 VD2 VD3 VD4 D/A + E/A + PWM

GND VSEN VFB

D01IN1260

COMP

November 2001

1/20

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E-L6911C DATASHEET