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8
SLUS593B − DECEMBER 2003 − REVISED APRIL 2004
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FEATURES
DESCRIPTION
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Operating Input Voltage 8 V to 40 V
The TPS4005x is a family of high-voltage, wide
Input Voltage Feed-Forward Compensation
< 1 % Internal 0.7-V Reference
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.
Programmable Fixed-Frequency Up to 1 MHz
Voltage Mode Controller
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Internal Gate Drive Outputs for High-Side and
Synchronous N-Channel MOSFETs
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.
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16-Pin PowerPADt Package (θ = 2°C/W)
JC
Thermal Shutdown
Externally Synchronizable
Programmable High-Side Current Limit
Programmable Closed-Loop Soft-Start
TPS40054 Source Only
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.
TPS40055 Source/Sink
TPS40057 Source/Sink With V
Prebias
OUT
APPLICATIONS
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Power Modules
Networking/Telecom
Industrial
Servers
SIMPLIFIED APPLICATION DIAGRAM
TPS4005xPWP
1
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KFF
16
15
ILIM
VIN
RT
V
IN
BP5
SYNC
BOOST 14
HDRV 13
12
SGND
SS/SD
VFB
SW
+
BP10 11
LDRV 10
V
OUT
−
COMP
PGND
9
UDG−03179
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Copyright 2004, Texas Instruments Incorporated
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