SNVU585B February   2020  – November 2021 LMR43620-Q1

 

  1.   Trademarks
  2. 1Setup
    1. 1.1 Test Points
    2. 1.2 Jumpers
  3. 2Operation
    1. 2.1 Quick Start
  4. 3Schematic
  5. 4Board Layout
  6. 5Bill of Materials
  7. 6Test Results
    1. 6.1 LMR43620MQ3EVM-2M Test Results
      1. 6.1.1 Efficiency and Load Regulation
      2. 6.1.2 Load Transients
      3. 6.1.3 Output Ripple and Thermal Picture
      4. 6.1.4 Conducted EMI
  8. 7Revision History

1.2 Jumpers

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.
GUID-20200903-CA0I-TKJN-BX8G-DPG60DVHJFTM-low.gif Figure 1-2 Jumper Locations