Infineon IR3447A User Manual

UM_2111_PL12_2112_224717
User manual for IR3447A evaluation board
25 A single-phase buck regulator with 1.2 V output

About this document

Scope and purpose
The IR3447A is a synchronous buck converter, providing a compact, high-performance and flexible solution in a
small 5 mm x 6 mm power QFN package.
Key features offered by the IR3447A include internal digital soft-start, precision 0.6 V reference voltage, power
good (P ), thermal protection, enable input, input undervoltage lockout (UVLO) for proper start-up, latched-
good
off overvoltage protection (OVP) and pre-bias start-up.
Output overcurrent protection (OCP) function is implemented by sensing the voltage developed across the on-
resistance of the synchronous MOSFET for optimum cost and performance, and the current limit is thermally
compensated.
This user manual contains the schematic and bill of materials for the EVAL_3447A_1.2Vout engineering
evaluation board. The manual describes operation and use of the evaluation board itself. Detailed application
information for IR3447A is available in the IR3447A datasheet.
Intended audience
This document is intended as a guide for design engineers evaluating IR3447A performance with the
EVAL_3447A_1.2Vout demo board.

Table of contents

About this document ....................................................................................................................... 1
Table of contents ............................................................................................................................ 1
1. Board information .................................................................................................................. 2
1.1 Board features ......................................................................................................................................... 2
1.2 Connections and operating instructions ................................................................................................ 2
1.3 Layout ...................................................................................................................................................... 3
1.4 PCB layout ............................................................................................................................................... 5
1.5 Bill of materials ........................................................................................................................................ 9
2. Typical operating waveforms ................................................................................................. 11
Revision history ............................................................................................................................. 16
User Manual
www.infineon.com/optimos-ipol
Please read the Important Notice and Warnings at the end of this document
page 1 of 17
V 1.0
2022-07-28