Datasheet

SLUU194 − May 2004
4
Using the TPS51020
Using the TPS51020
High-Performance Buck Controller Evaluation Module
Portable Power Produc
ts
CONTENTS
1 Descripiton 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Electrical Perfomance Specifications 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Schematic 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Test Setup and Results 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 EVM Assembly Drawing and PCB Layout 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 List of Materials 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 References 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Introduction
The TPS51020 is a multi-function dual-synchronous step-down controller. The part is specifically designed for
high performance, high-efficiency applications where the loss associated with a current sense resistor is
unacceptable. The TPS51020 uses feed-forward voltage mode control to improve the line response. Efficiency
at light load conditions can be maintained high as well by incorporating auto-skip operation. The TPS51020 can
be used in notebook computer system bus and I/O, DDR I or DDR II termination applications, distributed power
and point-of-load regulation for DSPs, FPGAs, ASICs, etc. in servers, base stations, and broadband, networking
or optical communications systems.
TPS51020EVM−001 evaluation module (EVM) is a high-efficiency, dual synchronous buck converter providing
5 V at 6.0 A and 3.3 V at 6.0 A from an 8.0 V to 20 V input. The TPS51020 operates at 300 kHz with a peak
efficiency of 94.8% with both channels enabled. This user’s guide describes the TPS51020EVM−001
performance in dual mode.