Datasheet

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15 Internal Layer 2 ............................................................................................................ 11
16 Bottom Layer............................................................................................................... 11
17 TPS54427 Schematic Diagram.......................................................................................... 12
List of Tables
1 Input Voltage and Output Current Summary ............................................................................ 2
2 TPS54427 Performance Specifications Summary...................................................................... 2
3 Output Voltages ............................................................................................................. 3
4 Connection and Test Points ............................................................................................... 4
5 Bill of Materials............................................................................................................. 12
1 Introduction
The TPS54427 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 TPS54427 package along with the gate drive circuitry.
The low drain-to-source on resistance of the MOSFETs allows the TPS54427 to achieve high efficiencies
and helps keep the junction temperature low at high-output currents. The TPS54427 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 7 V. Rated input voltage and output current range for the evaluation
module are given in Table 1.
The TPS54427 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 TPS54427 performance on the EVM.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Current Range
TPS54427 V
IN
= 4.5 V to 18 V 0 A to 4 A
2 Performance Specification Summary
A summary of the TPS54427 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 measurements, unless otherwise noted.
Table 2. TPS54427 Performance Specifications Summary
Specifications Test Conditions Min Typ Max Unit
Input voltage range, V
IN
4.5 12 18 V
Output voltage, V
OUT
1.05 V
Operating frequency V
IN
= 12 V, I
O
= 4 A 650 kHz
Output current range 0 4 A
Line regulation I
O
= 2.5 A +/- 0.33 %
Load regulation V
IN
= 12 V +/- 0.15 %
Overcurrent limit V
IN
= 12 V, L
O
= 1.5 µH 4.6 5.3 6.8 A
Output ripple voltage V
IN
= 12 V, I
O
= 4 A 15 mV
PP
Maximum efficiency V
IN
= 5 V, I
O
= 0.7 A 88 %
2
TPS54427, 4-A, SWIFT™ Regulator— Evaluation Module SLVU579–December 2011
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