SparkFun Buck Regulator Breakout - 5V (AP63357)

Item number 59398 Brand Sparkfun Model COM-21255 Share Write a review
SparkFun Buck Regulator Breakout - 5V (AP63357)

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The SparkFun 5V Buck Regulator Breakout is a powerful tool that boasts an AP63357 from Diodes Inc., a 3.5A synchronous buck converter with an expansive input voltage range of 3.8V to 32V. This versatile piece of equipment also features a fully integrated 74mΩ high-side power MOSFET/40mΩ low-side power MOSFET, providing a high-efficiency step-down DC/DC conversion.

The SparkFun Buck Regulator Breakout is configured to provide a regulated 5V output from a 6 to 32V input voltage range. This makes it an ideal choice for various applications where a steady and reliable power source is required. It also features a high-voltage EN (enable) control pin that is rated up to 32V. To help manage heat, a small copper pad is located on the back of the board where a heat sink can be attached if needed.

This full-size buck regulator breakout offers several options for connecting input and output power. It includes a pre-assembled screw terminal for non-permanent connections, the option to solder on a barrel jack for an external power supply, and five PTH pins for a more permanent installation. The breakout also comes with a red power indication LED that lights up when the power output is enabled, and two mounting holes compatible with 4-40 hardware.

The AP63357 is rated up to a 3.5A output, however, users should expect a maximum of 3A due to thermal constraints. The boards can output 3.5A but would require a sufficient amount of active cooling. For smaller, minimalistic versions of buck regulators, consider the SparkFun BabyBuck regulators.

The SparkFun 5V Buck Regulator Breakout comes with a variety of features including:

  • 2.54cm x 2.54cm PCB layout
  • Three power input/output options:
    • Pre-assembled 4-pin screw terminal
    • Five 2.54mm spaced PTH pins
    • Three plated slots for a DC barrel jack (input only)
  • Power connections:
    • VIN - Power In (6V to 32V)
    • GND - Common Ground
    • VOUT - Power Out (Regulated 5V)
    • EN - Enable (Pull high to enable the power output)
  • Red, power LED indicator
  • 1.27cm x 1.52cm Plated copper pad (for heat sinks)

The AP63357 features include:

  • VIN 3.8V to 32V
  • 3.5A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 22µA Low Quiescent Current (Pulse Frequency Modulation)
  • 450kHz Switching Frequency
  • Supports Pulse Frequency Modulation (PFM)
    • Up to 86% Efficiency at 5mA Light Load
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI
  • Low-Dropout (LDO) Mode
  • Power Good Indicator with 5MΩ Internal Pull-up
  • Precision Enable Threshold to Adjust UVLO
  • Protection Circuitry
    • Undervoltage Lockout (UVLO)
    • Output Undervoltage Protection (UVP)
    • Cycle-by-Cycle Peak Current Limit
    • Thermal Shutdown


Brand information
Brand Sparkfun
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Size info
Length27 mm
Width27 mm
Height10 mm
Weight9 g
€ 7,95€ 6,60 Excl. VAT (NL)
Out of stock Not in stock with the supplier
ETA is not known
Shipped from € 3,50 (NL) 30 days cooling-off Excellent service

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