Texas Instruments TPS54810 - Manual

TPS54810
SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005
4-V TO 6-V INPUT, 8-A OUTPUT SYNCHRONOUS BUCK PWM
SWITCHER WITH INTEGRATED FETS (SWIFT
™)
6,4 mm X 9,7 mm
FEATURES
D 30-mΩ MOSFET Switches for High Efficiency
at 8-A Continuous Output
D 0.9-V to 3.3-V Adjustable Output Voltage
Range With 1% Accuracy
D Externally Compensated
D Fast Transient Response
D Wide PWM Frequency:
Fixed 350 kHz, 550 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
APPLICATIONS
D Low-Voltage, High-Density Systems With
Power Distributed at 5 V
D Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors
D Broadband, Networking, and Optical
Communications Infrastructure
D Portable Computing/Notebook PCs
DESCRIPTION
As a member of the SWIFT™ family of dc/dc regulators,
the TPS54810 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 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.
The TPS54810 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.
VSENSE
VIN PH
BOOT
PGND
Output
COMP
AGND
VBIAS
Input
TPS54810
SIMPLIFIED SCHEMATIC
VSENSE
Compensation Network
I L − Load Current − A
Efficiency
− %
EFFICIENCY AT 700 HZ
50
55
60
65
70
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8 9 10
V I = 5 V
V O = 3.3 V
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.
www.ti.com
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
PowerPAD and SWIFT are trademarks of Texas Instruments.