SBVU072 October   2021 TPS7A21

 

  1. 1Trademarks
  2. 2Introduction
  3. 3Setup
    1. 3.1 LDO Input/Output Connector Descriptions
      1. 3.1.1 VIN and GND
      2. 3.1.2 VOUT and GND
      3. 3.1.3 EN
    2. 3.2 Optional Load Transient Input/Output Connector Descriptions
      1. 3.2.1 VDD and GND
      2. 3.2.2 J10
      3. 3.2.3 J12
      4. 3.2.4 J13
      5. 3.2.5 J16
      6. 3.2.6 J17
      7. 3.2.7 J19
      8. 3.2.8 TP2 and TP3
      9. 3.2.9 TP4
    3. 3.3 TPS7A21 LDO Operation
    4. 3.4 Optional Load Transient Circuit Operation
  4. 4Board Layout
  5. 5TPS7A21 EVM Schematic
  6. 6Bill of Materials

3.1.3 EN

EN is a 3-pin header used to enable or disable the TPS7A21.

The center pin of the 3-pin header is tied to the TPS7A21 EN input. When the 2-pin shunt is placed across the top two pins of the header, VIN is shorted to EN, and the TPS7A21 is enabled. When the 2-pin shunt is placed across the bottom two pins of the header, GND is shorted to EN, and the TPS7A21 is disabled. Alternatively, the 3-pin header can remain floating. The TPS7A21 includes an internal smart enable pulldown resistor, which ties the EN pin to GND through an internal 500-kΩ resistor. If the 3-pin header is floating, the TPS7A21 remains disabled.

When driving the EN terminal with an off-board supply or signal generator, the applied voltage must be kept between 0 V and 6.5 V.