Soft Power Switch - JST 2mm

This compact power-control board gives battery-powered projects a laptop-style on/off button while still allowing your microcontroller to take part in the shutdown process. A quick press turns the system on, another press can be handled by the MCU for an orderly shutdown, and a long press provides a hard power-down override if your code gets stuck.

It is built around a fully digital Texas Instruments design and includes a self-resetting 2A fuse, VIN and VOUT status LEDs, and very low quiescent current to help preserve battery life. This version is fitted with JST 2mm battery connectors and is intended for DC loads up to 5.5V only.

The board breaks out GND, VIN, VOUT, BTN, PUSH and OFF through PTH pads. Connect PUSH and OFF to your microcontroller to detect button presses and request a controlled power-off, or add an external momentary button between BTN and GND.

Supporting documentation from SparkFun includes schematic files, KiCad files, a 3D model, board dimensions, hookup guide, component datasheets, an example sketch and the hardware repo.

Features:

• Software feedback and control: passive, hard on/off switching with MCU interaction.
• Simple press on: a simple press will turn the system on.
• MCU-assisted power-off: another press can, with MCU intervention, turn off the system.
• Hard override: pressing and holding the button for ~10 seconds will force a power-down.
• Overcurrent protection: self-resetting 2A fuse.
• Visual feedback: input and output LEDs.
• Microcontroller pins: PUSH and OFF pins for monitoring button presses and initiating controlled shutdown.
• Timing control: wake-up and power-down times can be customised.
• Battery charging: supports battery charging while powering your project.
• Load type: designed for DC loads and not designed for AC loads.

Specifications:

• Input voltage: 5.5V maximum, 1.8V minimum
• Typical input: Typically ~3.7V from a single cell LiPo Battery
• Maximum current draw: 2A continuous, 4A peak (fuse protected)
• MOSFET: SIL2308 N&P-Channel MOSFET
• P-Channel on-resistance: 70mΩ (0.070 Ohm) typical P-Channel on-resistance
• Quiescent current: Very low quiescent current: <1µA @ 3.75V, with VIN LED disabled
• Connectors: 2x 2-Pin JST Right-Angle Connectors
• VIN: VIN
• VOUT: VOUT
• Battery charging: Supports battery charging
• Push button: Built-in momentary push button
• Hard override: push and hold the button for ~10 seconds
• Breakout PTH: provided
• Breakout PTH pins: GND, VIN, VOUT
• BTN: if desired, connect an external button between BTN and GND
• PUSH: open-drain output, requires pull-up, low indicates button is pushed
• OFF: drive high to turn the output off
• LEDs: VIN and VOUT (can be disabled if desired)
• Jumpers: provided
• Input power LED: Input power LED
• Output power LED: Output power LED
• Dimensions: 1.0in. x 1.0in. (25.4mm x 25.4mm)
• Weight: 3.10g

A handy choice for enclosed LiPo-powered builds that need a reliable front-panel power button and controlled shutdown behaviour.