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TPS54880PWP-TPS54880PWPR
5V Input 8A DC/DC Converter with Sequencing
TPS54880
SLVS450A − OCTOBER 2002 REVISED APRIL 2005
4-V TO 6-V INPUT, 8-A OUTPUT TRACKING SYNCHRONOUS BUCK
PWM SWITCHER WITH INTEGRATED FETs (SWIFT™) FOR SEQUENCING
6,4 mm X 9,7 mmTypical Size
FEATURES Power Up/Down Tracking For Sequencing 30-mΩ, 12-A Peak MOSFET Switches for HighEfficiency at 8-A Continuous Output Sourceor Sink Current Wide PWM Frequency: Fixed 350 kHz or Adjustable 280 kHz to 700 kHz Power Good and Enable Load Protected by Peak Current Limit andThermal Shutdown Integrated Solution Reduces Board Area andComponent Count
APPLICATIONS Low-Voltage, High-Density Distributed PowerSystems Point of Load Regulation for High Performance DSPs, FPGAs, ASICs andMicroprocessors Requiring Sequencing Broadband, Networking and OpticalCommunications Infrastructure
DESCRIPTIONAs a member of the SWIFT™ family of dc/dc regulators,the TPS54880 low-input voltage high-output currentsynchronous buck PWM converter integrates allrequired active components. Using the TRACKIN pinwith other regulators, simultaneous power up and downare easily implemented. Included on the substrate withthe listed features are a true, high performance, voltageerror amplifier that enables maximum performance andflexibility in choosing the output filter L and Ccomponents; an under-voltage-lockout circuit toprevent start-up until the input voltage reaches 3.8 V; aninternally or externally set slow-start circuit to limitinrush currents; and a power good output useful forprocessor/logic reset.
The TPS54880 is available in a thermally enhanced28-pin TSSOP (PWP) PowerPAD™ package, whicheliminates bulky heatsinks. TI provides evaluationmodules and the SWIFT™ designer software tool to aidin quickly achieving high-performance power supplydesigns to meet aggressive equipment developmentcycles.
SIMPLIFIED SCHEMATIC
Input
t − Time − 500 µs/div
Output
oltage
1 V/div
STARTUP TIMING
power Good
5 V/div
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