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L6910STR

Description
Switching converters, voltage regulators and controllers 5.0 to 12v step-down
Categorysemiconductor    Other integrated circuit (IC)   
File Size675KB,29 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
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L6910STR Overview

Switching converters, voltage regulators and controllers 5.0 to 12v step-down

L6910
L6910A
ADJUSTABLE STEP DOWN CONTROLLER
WITH SYNCHRONOUS RECTIFICATION
1
FEATURES
OPERATING SUPPLY VOLTAGE FROM 5V
TO 12V BUSES
UP TO 1.3A GATE CURRENT CAPABILITY
ADJUSTABLE OUTPUT VOLTAGE
N-INVERTING E/A INPUT AVAILABLE
0.9V ±1.5% VOLTAGE REFERENCE
VOLTAGE MODE PWM CONTROL
VERY FAST LOAD TRANSIENT RESPONSE
0% TO 100% DUTY CYCLE
POWER GOOD OUTPUT
OVERVOLTAGE PROTECTION
HICCUP OVERCURRENT PROTECTION
200kHz INTERNAL OSCILLATOR
OSCILLATOR EXTERNALLY ADJUSTABLE
FROM 50kHz TO 1MHz
SOFT START AND INHIBIT
PACKAGES: SO-16 & HTSSOP16
Figure 1. Packages
SO-16 (Narrow)
HTSSOP16 (Exposed Pad)
Table 1. Order Codes
Part Number
L6910
L6910TR
L6910A
L6910ATR
Package
SO-16
SO-16 in Tape & Reel
HTSSOP16
HTSSOP16 in Tape & Reel
2
APPLICATIONS
SUPPLY FOR MEMORIES AND TERMI-
NATIONS
COMPUTER ADD-ON CARDS
LOW VOLTAGE DISTRIBUTED DC-DC
MAG-AMP REPLACEMENT
3
DESCRIPTION
The device is a pwm controller for high performance
Figure 2. Block Diagram
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 divider.
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.
V
in
5V to 12V
VCC
OCSET
PGOOD
VREF
SS
MONITOR
PROTECTION
& REF
BOOT
UGATE
V
O
OSC
RT
OSC
PWM
-
+
BOOT
E/A
EAREF
300K
+
-
LGATE
PGND
GND
VFB
COMP
D03IN1509
May 2005
Rev. 9
1/29

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Description Switching converters, voltage regulators and controllers 5.0 to 12v step-down Switching converters, voltage regulators and controllers 5.0 to 12v step-down
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