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

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.
• SYNC — In a MODE/SYNC trim part, this test point is connected to the SYNC pin of the IC. This test point can also be connected to an external clock to synchronize the IC. Make sure R9 (RJM) is installed and R8 (RSYNC) is not installed when applying a sync clock input.

See Figure 1-2 for jumper locations.

• JEN — This jumper allows the ENABLE input to be connected to GND in order to disable the IC. By default, this jumper is left open since there is a pullup resistor, R2 (RENT), to VIN to enable the IC.
• JPGOOD — Use this jumper to select how the PGOOD pin is connected. A jumper can be used to connect pin 2 and 3. In this configuration, the PGOOD pin will be pulled up to VOUT through R7 (RPGOOD) with a value of 100 kΩ. When connecting the jumper between pin 1 and 2, the PGOOD pin will be pulled up to VCC through R7 (RPGOOD) with a value of 100 kΩ. By default, this jumper is not populated.
• JMODE/SYNC — Use this jumper to select the mode of operation in a MODE/SYNC trim part.
  Connecting a jumper between pin 1 and 2 sets the IC operation to PFM (pulse frequency modulation) mode for a higher efficiency at light load. A jumper between pin 2 and pin 3 causes the IC to operate in FPWM (forced pulse width modulation) mode. By default, the jumper is connected between pin 1 and 2. Pin 1 is indicated by the dot on the PCB.

Figure 1-2 Jumper Locations

1. Connect the voltage supply between the VIN_EMI and GND_EMI supply connections.
2. Connect the load between the VOUT and GND test points.
3. Set the supply voltage at an appropriate level between 3.5 V to 36 V. Set the current limit of the supply to an appropriate level.
4. Turn on the power supply. With the default configuration, the EVM powers up and provides V_OUT = 3.3 V.
5. Monitor the output voltage. The maximum load current is rated at 2 A with the LMR43620-Q1 device.