SparkFun BabyBuck Regulator Breakout - step-down 5V 3A - AP63357 - SparkFun COM-21256

The step-down converter in the BabyBuck version equipped with the AP63357 voltage regulator by Diodes Inc. Using it, you can convert the input voltage in the range from 6 V to 32 V to the output voltage of 5 V, with a current efficiency of 3 A. The module has a fully integrated 74 mOhm MOSFET on the high side and a 40 mOhm MOSFET on the low side, providing highly efficient DC-DC conversion. At the back of the module, the manufacturer placed a copper washer that dissipates excess heat generated by the plate during operation.

SparkFun BabyBuck Regulator Breakout - step-down converter 5 V 3 A - AP63357 - SparkFun COM-21256.

In the rear part of the module there is an element dissipating the generated heat.

The board has outputs in the form of solder pads, to which wires should be soldered and connected according to the following dependencies:

• 5V - output voltage (adjustable 5V)
• GND - system ground
• VIN - input voltage from 6 V to 32 V
• EN - high voltage control pin

• Inverter type: step-down
• Input voltage: 6V to 32V
• Output voltage: 5V
• Continuous output current: 3 A (according to the specification, the system has a current efficiency of 3.5 A, however, the manufacturer notes that due to the high heating of the module, this value may not be achievable)
• Reference voltage: 0.8V ± 1%
• Quiescent current: 22 µA
• Switching frequency: 450kHz
• Supports pulse frequency modulation (PFM): up to 86% efficiency at 5 mA load
• Patented design provides the best EMI reduction
• Frequency Spread Spectrum (FSS) for EMI reduction
• LDO mode
• Security:
  • undervoltage lockout (UVLO)
  • undervoltage outputs (UVP)
  • cycle-by-cycle peak current limit
  • thermal shutdown

SparkFun BabyBuck Regulator Breakout.

• Manufacturer's website: SparkFun COM-21256
• User Guide
• Layout diagram
• EagleCAD files
• Board dimensions
• AP63357 technical documentation
• GitHub repository