L6910 Datasheet, PDF (1/21 Pages) STMicroelectronics – ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION

L6910
L6910A
ADJUSTABLE STEP DOWN CONTROLLER
WITH SYNCHRONOUS RECTIFICATION
FEATURE
s OPERATING SUPPLY VOLTAGE FROM 5V
TO 12V BUSES
s UP TO 1.3A GATE CURRENT CAPABILITY
s ADJUSTABLE OUTPUT VOLTAGE
s N-INVERTING E/A INPUT AVAILABLE
s 0.9V ±1.5% VOLTAGE REFERENCE
s VOLTAGE MODE PWM CONTROL
s VERY FAST LOAD TRANSIENT RESPONSE
s 0% TO 100% DUTY CYCLE
s POWER GOOD OUTPUT
s OVERVOLTAGE PROTECTION
s HICCUP OVERCURRENT PROTECTION
s 200kHz INTERNAL OSCILLATOR
s OSCILLATOR EXTERNALLY ADJUSTABLE
FROM 50kHz TO 1MHz
s SOFT START AND INHIBIT
s PACKAGES: SO-16 & HTSSOP16
APPLICATIONS
s SUPPLY FOR MEMORIES AND TERMI-
NATIONS
s COMPUTER ADD-ON CARDS
s LOW VOLTAGE DISTRIBUTED DC-DC
s MAG-AMP REPLACEMENT
BLOCK DIAGRAM
PGOOD
VCC
OCSET
VREF
Monitor
SS
Protection and Ref
OSC
RT
OSC
L6910
EAREF
300k
E/A
+
-
-
+
PWM
COMP
SO-16 (Narrow)
HTSSOP16 (Exposed Pad)
ORDERING NUMBERS:
L6910 (SO-16)
L6910A (HTSSOP16)
L6910TR (Tape & Reel) L6910ATR (Tape & Reel)
DESCRIPTION
The device is a pwm controller for high performance
dc-dc conversion from 3.3V, 5V and 12V buses.
The output voltage is adjustable down to 0.9V; higher
voltages can be obtained with an external voltage di-
vider.
High peak current gate drivers provide for fast switch-
ing to the external power section, and the output
current can be in excess of 20A.
The device assures protections against load overcur-
rent and overvoltage. An internal crowbar is also pro-
vided turning on the low side mosfet as long as the
over-voltage is detected. In case of over-current de-
tection, the soft start capacitor is discharged and the
system works in HICCUP mode.
BOOT
UGATE
PHASE
LGATE
PGND
GND
VFB
Vin 5V to12V
Vo
July 2003
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