TPS54680_16 Datasheet, PDF (1/25 Pages) Texas Instruments – 3-V TO 6-V INPUT, 6-A OUTPUT TRACKING SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs

Typical Size
6,4 mm X 9,7 mm
www.ti.com
TPS54680
SLVS429B − OCTOBER 2002 − REVISED OCTOBER 2005
3-V TO 6-V INPUT, 6-A OUTPUT TRACKING SYNCHRONOUS BUCK
PWM SWITCHER WITH INTEGRATED FETs (SWIFT™) FOR SEQUENCING
FEATURES
D Power Up/Down Tracking For Sequencing
D 30-mΩ, 12-A Peak MOSFET Switches for High
Efficiency at 6-A Continuous Output Source
or Sink Current
D Wide PWM Frequency:
Fixed 350 kHz or Adjustable 280 kHz to
700 kHz
D Power Good and Enable
D Load Protected by Peak Current Limit and
Thermal Shutdown
D Integrated Solution Reduces Board Area and
Component Count
APPLICATIONS
D Low-Voltage, High-Density Distributed Power
Systems
D Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors Requiring Sequencing
D Broadband, Networking and Optical
Communications Infrastructure
SIMPLIFIED SCHEMATIC
DESCRIPTION
As a member of the SWIFT™ family of dc/dc regulators,
the TPS54680 low-input voltage high-output current
synchronous buck PWM converter integrates all
required active components. Using the TRACKIN pin
with other regulators, simultaneous power up and down
are easily implemented. Included on the substrate with
the listed features are a true, high performance, voltage
error amplifier that enables maximum performance 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 V; an
internally or externally set slow-start circuit to limit
inrush currents; and a power good output useful for
processor/logic reset.
The TPS54680 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.
Input
I/O Supply
VIN
PH
TPS54680
BOOT
TRACKIN PGND
VBIAS ^VSENSE
AGND COMP
Core Supply
STARTUP TIMING
V_I = 5 V
f_s = 700 kHz
I/O
CORE
PWRGD(I/O)
PWRGD(CORE)
t − Time − 500 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.
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