TPS54073_16 Datasheet, PDF (1/25 Pages) Texas Instruments – 2.2 – 4 -V, 14-A SYNCHRONOUS BUCK CONVERTER WITH DISABLED SINKING DURING START-UP

Typical Size
6,4 mm X 9,7 mm
TPS54073
www.ti.com ............................................................................................................................................................................................ SLVS547 – FEBRUARY 2005
2.2 – 4 -V, 14-A SYNCHRONOUS BUCK CONVERTER
WITH DISABLED SINKING DURING START-UP
FEATURES
1
•2 8-mΩ MOSFET Switches for High Efficiency at
14.5-A Peak Output Current
• Separate Low-Voltage Power Bus
• Disabled Current Sinking During Start-Up
• Adjustable Output Voltage Down to 0.9 V
• Wide PWM Frequency: Fixed 350 kHz, 550 kHz
or Adjustable 280 kHz to 700 kHz
• Synchronizable to 700 kHz
• Load Protected by Peak Current Limit and
Thermal Shutdown
• Integrated Solution Reduces Board Area and
Total Cost
APPLICATIONS
• Low-Voltage, High-Density Distributed Power
Systems
• Point of Load Regulation for High-
Performance DSPs, FPGAs, ASICs, and
Microprocessors
• Broadband, Networking, and Optical
Communications Infrastructure
• Power PC Series Processors
TYPICAL APPLICATION
*
**
Voltage
Input 1
Voltage
Input 2
PVIN
PH
TPS54073
BOOT
VIN
PGND
VBIAS ^VSENSE
AGND COMP
DESCRIPTION
As a member of the SWIFT™family of dc/dc
regulators, the TPS54073 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 and flexibility in
choosing the output filter L and C components; an
undervoltage-lockout circuit to prevent start-up until
the input voltage reaches 3 V; an internally or
externally set slow-start circuit to limit in-rush
currents; and a power good output useful for
processor/logic reset, fault signaling, and supply
sequencing.
For reliable power up in output precharge
applications, the TPS54073 is designed to only
source current during start-up.
The TPS54073 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
START-UP WAVEFORM
WITH 3 PRECHARGE DIODES
Output
RL = 1.5 W
V_I/O = 3.3 V
V_(core) = 1.5 V
* Optional
t - Time - 5 ms/div
1
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.
SWIFT, PowerPAD are trademarks of Texas Instruments.
2
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 © 2005, Texas Instruments Incorporated