TPS40075 Datasheet, PDF (1/44 Pages) Texas Instruments – MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD

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MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER
WITH VOLTAGE FEED-FORWARD
TPS40075
SLUS676 – MAY 2006
FEATURES
• Operation Over 4.5-V to 28-V Input Range
• Fixed-Frequency Voltage-Mode Controller
• Integrated Unity Gain Amplifier for Remote
Output Sensing
• Predictive Gate Drive™ Generation II for
Improved Efficiency
• <1% Internal 700-mV Reference
• Input Voltage Feed Forward Control
• Prebiased Output Compatible
• Internal Gate Drive Outputs for High-Side and
Synchronous N-Channel MOSFETs
• Switching Frequency Programmable to 1 MHz
• 20-Pin QFN Package
• Thermal Shutdown Protection
• Software Design Tool and EVM Available
APPLICATIONS
• Power Modules
• Networking/Telecom
• Industrial
• Servers
CONTENTS
Device Ratings
2
Electrical Characteristics
4
Terminal Information
12
Application Information
15
Design Example
26
Additional References
40
DESCRIPTION
The TPS40075 is a mid voltage, wide input (4.5-V to
28-V), synchronous, step-down controller, offering
design flexibility for a variety of user programmable
functions, including; soft start, UVLO, operating
frequency, voltage feed-forward and high-side FET
sensed short circuit protection.
The TPS40075 drives external N-channel MOSFETs
using second generation Predictive Gate Drive to
minimize conduction in the body diode of the low
side FET and maximize efficiency. Pre-biased
outputs are supported by not allowing the low side
FET to turn on until the voltage commanded by the
closed loop soft start is greater than the pre-bias
voltage. Voltage feed forward provides good
response to input transients and provides a constant
PWM gain over a wide input voltage operating range
to ease compensation requirements. Programmable
short circuit protection provides fault current limiting
and hiccup recovery to minimize power dissipation
with a shorted output. The 20 pin QFN package
gives good thermal performance and a compact
footprint.
SIMPLIFIED APPLICATION DIAGRAM
V_OUT−
(at Load)
V_OUT+
(at Load)
1
20
SA−
SA+
TPS40075
2 SAO
SYNC 19
3 GND
PGD 18
4 SS
LVBP 17
5 FB
RT 16
6 COMP
KFF 15
SYNC IN
PowerGood OUT
7 PGND
ILIM 14
V_IN
8 LDRV
VDD 13
9 DBP
SW
10
HDRV 12
BOOST
11
V_OUT−
V_OUT+
UDG−04075
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Predictive Gate Drive is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated