L6911E,L6911ETR

Part No.:
L6911E,L6911ETR
Download:
Download
Description:
5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
File Size:
148 K
Page:
20 Pages
Logo:
Maker:
STMICROELECTRONICS [ STMICROELECTRONICS ]
PCB Prototype

July 19, 2018:

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PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1
L6911E
5 BIT PROGRAMMABLE STEP DOWN CONTROLLER
WITH SYNCHRONOUS RECTIFICATION
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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 8.5 :
1.050V TO 1.825V WITH 0.025V 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: L6911E
L6911ETR
(Tape and Reel)
DESCRIPTION
The device is a power supply controller specifically
designed to provide a high performance DC/DC con-
version for high current microprocessors. A precise 5
bit digital to analog converter (DAC) allows to adjust
the output voltage from 1.050 to 1.825 with 25mV bi-
nary steps.
The high precision internal reference assures the se-
lected 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 over-voltage. An external SCR
is triggered to crowbar the input supply in case of
hard overvoltage. An internal crowbar is also provid-
ed turning on the low side mosfet as long as the over-
voltage is detected. In case of over-current detection,
the soft start capacitor is discharged an the system
works in HICCUP mode.
APPLICATIONS
s
POWER SUPPLY FOR ADVANCED
MICROPROCESSOR CORE
s
DISTRIBUTED POWER SUPPLY
BLOCK DIAGRAM
Vcc 5V to12V
Vin 5V to12V
VCC
OCSET
BOOT
MONITOR and
PROTECTION
OVP
RT
VD0
VD1
VD2
VD3
VD4
D/A
+
-
E/A
-
+
PWM
PHASE
LGATE
PGND
GND
VSEN
VFB
Vo
1.050V to 1.825V
PGOOD
SS
UGATE
OSC
D98IN957
COMP
November 2001
1/20