SparkFun

SparkFun MOSFET Power Switch and Buck Regulator (Low-Side)

Name: SparkFun MOSFET Power Switch and Buck Regulator (Low-Side)
Brand: SparkFun
SKU: SF-COM-23979
Price: 32.41 AUD
Availability: InStock

· MPN: COM-23979

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Does your microcontroller need to control a high-voltage item, like a 12V LED strip, while also needing to be powered? Do you want to avoid having multiple p...

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Does your microcontroller need to control a high-voltage item, like a 12V LED strip, while also needing to be powered? Do you want to avoid having multiple power adapters and microcontrollers for your project? The MOSFET Power Switch and Buck Regulator (Low-Side) is one product we needed at SparkFun, so we figured other folks might have the same problem. Power the board with up to 12V and control up to 10A, all while providing a sweet 3.3V to your control board.

The SparkFun MOSFET Power Switch and Buck Regulator (Low-Side) combines two circuits into one board: an LMR14203 buck regulator configured to output 3.3V and an N-channel MOSFET (PSMN7R0-100BS) configured as a low-side switch. A flyback diode is also on the load side for devices with back EMF! Simply pull the CTL pin low to activate the load.

Various connectors (barrel jack, female header, and poke-home) are provided to connect a power supply to a microcontroller of your choice (Arduino, micro-bit, Raspberry Pi’s microcontroller) and load them together. VCC, 3.3V, CTL, and GND are also broken out through 0.1" spaced PTHs for those who prefer to solder. Two LEDs (PWR_LED and ON_LED) indicate when there is 3.3V and whenever power is applied to the load. Jumpers are included on the back to disable the LEDs. A MEAS PTH jumper is also included for those interested in precisely measuring the current consumption of the system.

Note: While the MOSFET is rated to 100A/100V, we don't recommend you go much above 10A as the PCB polygon pours and traces become the limiter.

Get Started With the SparkFun MOSFET Power Switch and Buck Regulator Guide

Features:

Input Voltage Range: 4.5V to 12V
LMR14203 Step Down Voltage Regulator
- Configured to Output 3.3V/300mA
PSMN7R0-1000BS N-Channel MOSFET
- Configured as a Low-Side Switch
Connectors
- Input: 5.5mm x 2.1mm Barrel Jack (Center-Positive)
- Output: Poke-Home Connectors
- Control: 1x4 Female Headers
0.1"-spaced PTHs
Built-in Flyback Diode on Load
LEDs
- PWR
- ON
Jumpers
- PWR_LED
- MEAS
- ON_LED
Dimensions: 1.50" x 1.50" (38.1mm x 38.1mm)
Weight: 9.9g

Documents:

Jargon buster

Plain-language definitions for the technical terms used above.

Headers: Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
LED: A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
microcontroller: A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
PCB: A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
PTH: Plated through-hole means the pin holes are metal-lined so solder connects the pad on both sides of the board. It is useful for connectors and headers that need a strong mechanical and electrical connection.