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The L6911B is a power supply controller specifically designed to provide a high performance DC/DC conversion for Pentium II Microprocessors. A precise 5 bit digital to analog converter (DAC) allows to adjust the output voltage from 1.3V to 2.05V with 0.05V binary steps and from 2.1V to 3.5V with 0.1V binary steps. The high precision internal reference, digitally trimmed, assures the selected output voltage to within +/-1%. Thanks to the window comparator system, the device provides excellent load transient performance. The high peak current gate drive affords to have fast switching to the external power mos, performing an high efficiency. The L6911B assures a fast protection against load overvoltage and load overcurrent. An external SCR is triggered to crowbar the input supply in case of overvoltage. In case of output short circuit the soft start capacitor is discharged and the system works in hiccup mode.
L6911B Maximum Ratings
Symbol
Parameter
Value
Unit
VCC
VCC to PGND
15
V
VBOOT-VPHASE
Boot Voltage
15
V
Input, Output or I/O Voltage
-0.3 to VCC+0.3
V
L6911B Features
`OPERATING SUPPLY VOLTAGE FROM 5V TO 12V `TTL-COMPATIBLE 5BIT PROGRAMMABLE OUTPUT FROM: -1.3V TO 2.05V WITH 0.05V BINARYSTEPS -2.1V TO 3.5V WITH 0.1V BINARY STEPS `VOLTAGEMODE PWMCONTROL `EXCELLENT OUTPUT ACCURACY +/-1% OVERLINE,ANDTEMPERATUREVARIATIONS `HIGH PRECISION INTERNAL REFERENCE DIGITALLY TRIMMED `VERY FAST LOAD TRANSIENT 0% TO100% DUTY CYCLE `POWERGOOD OUTPUT `OVERVOLTAGE PROTECTION `OVERCURRENT PROTECTION REALISED USING THE MOSFET's RDSon `OPERATING FREQUENCY FROM 50KHz TO 1MHz `MEETS INTEL PENTIUM II SPECIFICATION `DISABLEFUNCTION
L6911B Typical Application
·POWER SUPPLY FOR ADVANCED MICROPROCESSORSUPPLIES ·POWER SUPPLY FOR PENTIUM II INTEL PROCESSORS