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ELECTRONICS

ESP32 Latching Power Switch

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UPDATED 2026-08-03
TYPECircuit
USE-CASELatching Power Switch
EXAMPLEESP32 Latching Power Switch
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CASE ANALYSIS

Scenario

Designing a battery-powered IoT device that needs a push-to-on/software-off power latching circuit, so the ESP32 can self-shutdown after tasks or on low battery.

Key decisions

  • Use a high-side P-channel MOSFET to switch ESP32 power; gate pulled high by resistor to Vbat, pulled low by push button or NPN latch.
  • Add an NPN transistor with base driven by ESP32 GPIO through a resistor to hold the MOSFET gate low after turn-on.
  • Include a TC54 voltage detector on the output rail to signal battery health to an ADC pin for graceful low-battery shutdown.

When to reuse this

Battery-operated microcontroller devices requiring a physical button to power on and software to power off while monitoring battery status.

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