LMR43620-Q1 EVM User’s Guide

1 LMR43620RQ5EVM-400 EVM User’s Guide

The Texas Instruments LMR43620RQ5EVM-400 evaluation module (EVM) helps designers evaluate the operation and performance of the LMR43620-Q1 wide-input buck converter. The LMR43620-Q1 is an easy-to-use synchronous step-down voltage converter capable of driving up to 2 A of load current from an input voltage of up to 36 V. The LMR43620RQ5EVM-400 features an output voltage of 5 V and a switching frequency of 400 kHz. See the data sheet for additional features, detailed descriptions, and available options.

Table 1-1 Device and Package Configurations

EVM	U1	FREQUENCY	SPREAD SPECTRUM	CURRENT	PIN 1 TRIM
LMR43620RQ5EVM-400	LMR43620RS5QRPERQ1	400 kHz	Enabled	2 A	RT

LMR43620RQ5EVM-400 Board

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1 Setup

This section describes the test points and connectors on the EVM and how to properly connect, set up, and use the LMR43620-Q1 EVM.

1.1 Test Points

The test points on the board can be used for connecting to the input of a power supply and output load for the EVM. See Figure 1-1 for typical test setup. The functions of the test points connections are:

VIN_EMI — Input supply to EVM including an EMI filter. Connect to a suitable input supply. Connect at this point for EMI test.
GND_EMI — Ground connection for the input supply
VIN — Input supply to the IC. Can be connected to DMM to measure input voltage after EMI filter.
VOUT — Output voltage test point of EVM. Can be connected to a desired load.
GND — Ground test points
EN — This test point is connected to the EN pin. By default, there is a pullup resistor, R1 (RENT), to VIN to enable the IC.
PGOOD — This test point is connected to the PGOOD pin from the IC. Can be tied to an external supply through a pullup resistor or left open.
RT — In a RT trim part, this test point is connected to the RT pin of the IC through shunt resistor R9 (RJM). Make sure R9 (RJM) is installed and R8 (RT) is not installed when using jumper J3 (JRT) to connect the RT pin to Vcc or to GND.

Figure 1-1 EVM Board Connections