Texas Instruments TPS54326EVM-540, Руководство пользователя, Страница: 2 / 20

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1 Introduction
This user’s guide contains background information for the TPS54326 as well as support documentation for the
TPS54326EVM-540 evaluation module. Also included are the performance specifications, schematic and the bill
of materials for the TPS54326EVM-540.
1.1 Background
The TPS54326 is a single, adaptive on-time D-CAP2 ™ mode synchronous buck converter requiring a very 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 TPS54326 package along with the gate drive circuitry. The low drain-to-source
on resistance of the MOSFETs allow the TPS54326 to achieve high efficiencies and helps keep the junction
temperature low at high output currents. The TPS54226 also has an Auto-Skip mode to enable higher efficiency
at light loads. The TPS54326 dc/dc synchronous converter is designed to provide up to a 2A output from an
input control voltage source of 4.5V to 18V, input power voltage source of 2V to 18V and output voltage from
0.76V to 5.5V. Rated input voltage, output voltage and output current range for the evaluation module are given
in
Table 1-1 .
Table 1-1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Voltage and Current Range
TPS54326EVM-540 VIN = 4.5V to 18V Vout = 1.05 V, 0A to 2A
1.2 Performance Specification Summary
A summary of the TPS54326EVM-540 performance specifications is provided in Table 1-2 . Specifications are
given for an input voltage of VIN = 12V and an output voltage of 1.05V, unless otherwise noted. The ambient
temperature is 25°C for all measurement, unless otherwise noted.
Table 1-2. TPS54326 EVM and Performance Specifications Summary
Specifications Test Conditions Min Typ Max Unit
Input voltage range (VIN) 4.5 12 18 V
CH1
Output voltage 1.05 V
Operating frequency VIN = 12V, I
O
= 1A 700 kHz
Output current range 0 3 A
Over current limit VIN = 12V 4.1 A
Output ripple voltage VIN = 12V, I
O
= 3A 7 mV
PP
Introduction www.ti.com
2 TPS54326 Step-Down Converter Evaluation Module User's Guide SLVU353A – NOVEMBER 2009 – REVISED OCTOBER 2021
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