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L6911ETR Folha de dados(PDF) 1 Page - STMicroelectronics

Nome de Peças L6911ETR
Descrição Electrónicos  5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
PDF  20 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6911ETR Folha de dados(HTML) 1 Page - STMicroelectronics

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L6911E
November 2001
s
OPERATING SUPPLY IC VOLTAGE FROM 5V
TO 12V BUSES
s
UP TO 1.3A GATE CURRENT CAPABILITY
s
TTL-COMPATIBLE 5 BIT PROGRAMMABLE
OUTPUT COMPLIANT WITH VRM 8.5 :
1.050V TO 1.825V WITH 0.025V BINARY
STEPS
s
VOLTAGE MODE PWM CONTROL
s
EXCELLENT OUTPUT ACCURACY:
±1%
OVER LINE AND TEMPERATURE
VARIATIONS
s
VERY FAST LOAD TRANSIENT RESPONSE:
FROM 0% TO 100% DUTY CYCLE
s
POWER GOOD OUTPUT VOLTAGE
s
OVERVOLTAGE PROTECTION AND
MONITOR
s
OVERCURRENT PROTECTION REALIZED
USING THE UPPER MOSFET’S RdsON
s
200KHz INTERNAL OSCILLATOR
s
OSCILLATOR EXTERNALLY ADJUSTABLE
FROM 50KHz TO 1MHz
s
SOFT START AND INHIBIT FUNCTIONS
APPLICATIONS
s
POWER SUPPLY FOR ADVANCED
MICROPROCESSOR CORE
s
DISTRIBUTED POWER SUPPLY
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.
SO-20
ORDERING NUMBERS: L6911E
L6911ETR (Tape and Reel)
5 BIT PROGRAMMABLE STEP DOWN CONTROLLER
WITH SYNCHRONOUS RECTIFICATION
BLOCK DIAGRAM
PGND
PHASE
GND
VFB
LGATE
BOOT
UGATE
VCC
OCSET
Vcc 5V to12V
Vin 5V to12V
Vo
1.050V to 1.825V
PGOOD
COMP
VSEN
SS
OVP
RT
VD0
VD1
VD2
VD3
VD4
MONITOR and
PROTECTION
OSC
D/A
E/A
PWM
+
-
-
+
D98IN957


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