Datasheet

Introduction www.ti.com
15 Bottom Layer............................................................................................................... 12
16 Bottom Assembly .......................................................................................................... 13
17 TPS54228EVM-686 Schematic Diagram............................................................................... 14
List of Tables
1 Input Voltage and Output Current Summary ............................................................................ 2
2 TPS54228EVM-686 Performance Specifications Summary .......................................................... 2
3 Output Voltages ............................................................................................................. 3
4 Connection and Test Points ............................................................................................... 4
5 Bill of Materials............................................................................................................. 14
1 Introduction
The TPS54228 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 700 kHz. The high-side and low-side
switching MOSFETs are incorporated inside the TPS54228 package along with the gate drive circuitry.
The low drain-to-source on resistance of the MOSFETs allows the TPS54228 to achieve high efficiencies
and helps keep the junction temperature low at high-output currents. The TPS54228 also features
auto-skip Eco-mode™ operation for improved light-load efficiency. The TPS54228 dc/dc synchronous
converter is designed to provide up to a 2-A output from an input voltage source of 4.5 V to 18 V. The
output voltage range is from 0.76 V to 7.0 V. Rated input voltage and output current range for the
evaluation module are given in Table 1.
The TPS54228EVM-686 evaluation module is a single, synchronous buck converter providing 1.05 V at 2
A from 4.5-V to 18-V input. This user’s guide describes the TPS54228EVM-686 performance.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Current Range
TPS54228EVM-686 V
IN
= 4.5 V to 18 V 0 A to 2 A
2 Performance Specification Summary
A summary of the TPS54228EVM-686 performance specifications is provided in Table 2. Specifications
are given for an input voltage of V
IN
= 12 V and an output voltage of 1.05 V, unless otherwise noted. The
ambient temperature is 25°C for all measurement, unless otherwise noted.
Table 2. TPS54228EVM-686 Performance Specifications Summary
Specifications Test Conditions Min Typ Max Unit
Input voltage range (V
IN
) 4.5 12 18 V
Output voltage 1.05 V
Operating frequency V
IN
= 12 V, I
O
= 1 A 700 kHz
Output current range 0 2 A
+/- %
Line regulation I
O
= 1 A
0.22
+0.85/-
Load regulation V
IN
= 12 V %
0.02
Over current limit V
IN
= 12 V, L
O
= 1.5 µH 2.5 3.3 4.7 A
Output ripple voltage V
IN
= 12 V, I
O
= 3 A 15 mV
PP
Maximum efficiency V
IN
= 5 V, I
O
= 0.3 A 85.1 %
2
TPS54228EVM-686, 2-A, SWIFT™ Regulator Evaluation Module SLVU452–May 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated