TPS54972_12 Datasheet, PDF (1/19 Pages) Texas Instruments – 9-A OUTPUT, 3-V TO 4-V INPUT TRACKING/TERMINATION SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs

6,4 mm x 9,7 mm
TPS54972
www.ti.com
SLVS437B – AUGUST 2002 – REVISED AUGUST 2010
9-A OUTPUT, 3-V TO 4-V INPUT TRACKING/TERMINATION
SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs (SWIFT™)
FEATURES
1
• Tracks Externally Applied Reference Voltage
• 15-mΩ MOSFET Switches for High Efficiency
at 9-A Continuous Output Source or Sink
Current
• 6% to 90% V_I 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
SIMPLIFIED SCHEMATIC
VIN
PH
TPS54972
BOOT
PGND
REFIN
VBIAS
COMP
AGND ^VSENSE
V_(TTQ)
TRANSIENT RESPONSE
V_I = 3.3 V
V_O = 1.25 V
Compensation
Network
2.25 A to 6.75 A
t – Time – µs/div
1
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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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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