TPS40054 Datasheet, PDF (1/33 Pages) Texas Instruments – WIDE INPUT SYNCHRONOUS BUCK CONTROLLER

TPS40054
TPS40055
TPS40057
8
SLUS593B − DECEMBER 2003 − REVISED APRIL 2004
WIDEĆINPUT SYNCHRONOUS
BUCK CONTROLLER
FEATURES
D Operating Input Voltage 8 V to 40 V
D Input Voltage Feed-Forward Compensation
D < 1 % Internal 0.7-V Reference
D Programmable Fixed-Frequency Up to 1 MHz
Voltage Mode Controller
D Internal Gate Drive Outputs for High-Side and
Synchronous N-Channel MOSFETs
D 16-Pin PowerPADt Package (θ_JC = 2°C/W)
D Thermal Shutdown
D Externally Synchronizable
D Programmable High-Side Current Limit
D Programmable Closed-Loop Soft-Start
D TPS40054 Source Only
D TPS40055 Source/Sink
D TPS40057 Source/Sink With V_OUT Prebias
APPLICATIONS
D Power Modules
D Networking/Telecom
D Industrial
D Servers
SIMPLIFIED APPLICATION DIAGRAM
DESCRIPTION
The TPS4005x is a family of high-voltage, wide
input (8 V to 40 V), synchronous, step-down
converters. The TPS4005x family offers design
flexibility with a variety of user programmable
functions, including soft-start, UVLO, operating
frequency, voltage feed- forward, high-side
current limit, and loop compensation.
The TPS4005x are also synchronizable to an
external supply. They incorporate MOSFET gate
drivers for external N-channel high-side and
synchronous rectifier (SR) MOSFETs. Gate drive
logic incorporates anti-cross conduction circuitry
to prevent simultaneous high-side and
synchronous rectifier conduction.
The TPS4005x uses voltage feed-forward control
techniques to provide good line regulation over
the wide (4:1) input voltage range, and fast
response to input line transients with near
constant gain with input variation which eases
loop compensation. The externally programmable
current limit provides pulse-by-pulse current limit,
as well as hiccup mode operation utilizing an
internal fault counter for longer duration
overloads.
TPS4005xPWP
1 KFF
ILIM 16
2 RT
VIN 15
VIN
3 BP5 BOOST 14
4 SYNC HDRV 13
5 SGND
SW 12
6 SS/SD BP10 11
7 VFB
LDRV 10
8 COMP PGND 9
+
VOUT
−
UDG−03179
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright  2004, Texas Instruments Incorporated
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