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L6910TR Fiches technique(PDF) 1 Page - STMicroelectronics

No de pièce L6910TR
Description  ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L6910
L6910A
July 2003
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
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.
SO-16 (Narrow)
HTSSOP16 (Exposed Pad)
ORDERING NUMBERS:
L6910
(SO-16)
L6910A
(HTSSOP16)
L6910TR (Tape & Reel) L6910ATR (Tape & Reel)
ADJUSTABLE STEP DOWN CONTROLLER
WITH SYNCHRONOUS RECTIFICATION
BLOCK DIAGRAM
L6910
PGND
PHASE
GND
VFB
LGATE
BOOT
UGATE
VCC
OCSET
Vin 5V to12V
Vo
PGOOD
COMP
SS
Monitor
Protection and Ref
OSC
+
-
+
-
E/A
PWM
EAREF
OSC
VREF
300k
RT


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