TPS54872_16 Datasheet, PDF (1/22 Pages) Texas Instruments – 8-A OUTPUT, 4-V TO 6-V INPUT TRACKING/TERMINATION SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs

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6,4 mm x 9,7 mm
TPS54872
SLVS436C − JULY 2002 − REVISED FEBRUARY 2005
8ĆA OUTPUT, 4ĆV TO 6ĆV INPUT TRACKING/TERMINATION
SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs (SWIFT)
FEATURES
D Tracks Externally Applied Reference Voltage
D 30-mΩ MOSFET Switches for High Efficiency
at 8-A Continuous Output Source or Sink
Current
D 6% to 90% V_I Output Tracking Range
D Wide PWM Frequency:
Fixed 350 kHz or Adjustable 280 kHz to
700 kHz
D Load Protected by Peak Current Limit and
Thermal Shutdown
D Integrated Solution Reduces Board Area and
Total Cost
DESCRIPTION
As a member of the SWIFT family of dc/dc regulators,
the TPS54872 low-input voltage high-output current
synchronous-buck PWM converter integrates all
required active components. Included on the substrate
with the listed features are a true, high performance,
voltage error amplifier that enables maximum
performance under transient conditions and flexibility in
choosing the output filter L and C components; an
under-voltage-lockout circuit to prevent start-up until
the input voltage reaches 3.8 V; an internally set
slow-start circuit to limit in-rush currents; and a status
output to indicate valid operating conditions.
APPLICATIONS
D DDR Memory Termination Voltage
D Active Termination of GTL and SSTL
High-Speed Logic Families
D DAC Controlled High Current Output Stage
D Precision Point of Load Power Supply
The TPS54872 is available in a thermally enhanced
28-pin TSSOP (PWP) PowerPAD package, which
eliminates bulky heatsinks. TI provides evaluation
modules and the SWIFT designer software tool to aid
in quickly achieving high-performance power supply
designs to meet aggressive equipment development
cycles.
SIMPLIFIED SCHEMATIC
V(DDQ)
Input
VIN
PH
TPS54872
BOOT
PGND
REFIN
VBIAS
COMP
AGND ^VSENSE
V(TTQ)
TRANSIENT RESPONSE
VI = 5 V,
VO = 1.25 V
Compensation
Network
2 A to 6 A
t − Time − 100 ms/div
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.
PowerPAD and SWIFT are trademarks of Texas Instruments.
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.
Copyright  2002 − 2005, Texas Instruments Incorporated