TPS54972 Datasheet, PDF (1/16 Pages) Texas Instruments – 9-A OUTPUT, 3-V TO 4-V INPUT TRACKING/TERMINATION SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETS

www.ti.com
6,4 mm x 9,7 mm
TPS54972
SLVS437A — AUGUST 2002 – REVISED DECEMBER 2002
9-A OUTPUT, 3-V TO 4-V INPUT TRACKING/TERMINATION
SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETS (SWIFT™)
FEATURES
• ^{Tracks Externally Applied Reference Voltage}
• ^{15-mΩ MOSFET Switches for High Efficiency at}
9-A Continuous Output Source or Sink Current
• ^{6% to 90% VI Output Tracking Range}
• ^{Wide PWM Frequency: Fixed 350 kHz or}
Adjustable 280 kHz to 700 kHz
• Load Protected by Peak Current Limit and
Thermal Shutdown
• Integrated Solution Reduces Board Area and
Total Cost
APPLICATIONS
• ^{DDR Memory Termination Voltage}
• ^{Active Termination of GTL and SSTL}
High-Speed Logic Families
• ^{DAC Controlled High Current Output Stage}
• ^{Precision Point of Load Power Supply}
DESCRIPTION
As a member of the SWIFT™ family of dc/dc regulators,
the TPS54972 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 3.0 V; an internally set slow-start
circuit to limit in-rush currents; and a status output to
indicate valid operating conditions.
The TPS54972 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.
V_(DDQ)
Input
VIN
PH
TPS54972
BOOT
PGND
REFIN
VBIAS
COMP
AGND ^VSENSE
SIMPLIFIED SCHEMATIC
V_(TTQ)
Compensation
Network
TRANSIENT RESPONSE
V_I = 3.3 V
V_O = 1.25 V
2.25 A to 6.75 A
t – Time – µs/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.
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, Texas Instruments Incorporated