Datasheet

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15 TPS54428EVM-052 Shut-down Relative to EN ....................................................................... 10
16 Top Assembly.............................................................................................................. 11
17 Top Layer................................................................................................................... 12
18 Internal Layer 1 ............................................................................................................ 12
19 Internal Layer 2 ............................................................................................................ 13
20 Bottom Layer............................................................................................................... 13
21 TPS54428EVM-052 Schematic Diagram............................................................................... 14
List of Tables
1 Input Voltage and Output Current Summary ............................................................................ 2
2 TPS54428EVM-052 Performance Specifications Summary .......................................................... 3
3 Output Voltages ............................................................................................................. 3
4 Connection and Test Points ............................................................................................... 4
5 Bill of Materials............................................................................................................. 14
1 Introduction
The TPS54428 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a
low, external component count. The D-CAP2™ control circuit is optimized for low-ESR output capacitors
such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external
compensation. The switching frequency is internally set at a nominal 650 kHz. The high-side and low-side
switching MOSFETs are incorporated inside the TPS54428 package along with the gate drive circuitry.
The low drain-to-source on resistance of the MOSFETs allows the TPS54428 to achieve high efficiencies
and helps keep the junction temperature low at high-output currents. The TPS54428 also features
auto-skip Eco-mode™ operation for improved light-load efficiency. The TPS54428 dc/dc synchronous
converter is designed to provide up to a 4 A output from an input voltage source of 4.5 V to 18 V. The
output voltage range is from 0.76 V to 6 V. Rated input voltage and output current range for the evaluation
module are given in Table 1.
The TPS54428EVM-052 evaluation module is a single, synchronous buck converter providing 1.05 V at 4
A from 4.5-V to 18-V input. This user’s guide describes the TPS54428EVM-052 performance.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Current Range
TPS54428EVM-052 V
IN
= 4.5 V to 18 V 0 A to 4A
2
TPS54428, 4-A, SWIFT™ Regulator Evaluation Module SLVU578–December 2011
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