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Small green circuit board with blue digital voltmeter display and silver potentiometer knob, rectangular 68 by 42 by 14 mm

JacobsParts Inc.

JacobsParts Inc. FP5139 100W DC Boost Step-up Converter

SKU CH-F2BN-ANXCJ

Steps up 3–35 V DC input to 3.5–35 V DC at up to 6 A with 96 % efficiency and built-in voltmeter

  • Product type100 W
  • Efficient 96% boost conversion reduces energy loss
  • 100W maximum output when input and output exceed 20V
  • Wide 3-35V input range suits diverse power sources
  • Built-in voltmeter simplifies voltage monitoring and adjustment
  • Compact 68x42x14mm module fits tight project spaces

Boost Converter for Low-to-High Voltage Projects

The JacobsParts FP5139 is a dedicated 100 W DC boost step-up converter that raises a lower input voltage to a higher, regulated output. It suits hobbyists and engineers powering 5 V USB gear from a 3.7 V lithium cell, driving LED strips from a 12 V battery, or similar automotive and electronic projects where the supply is always below the load voltage.

Verify Input Range and Polarity Before Wiring

The module accepts 3 to 35 V DC at up to 9 A on the input side and delivers 3.5 to 35 V DC at up to 6 A on the output. Output must always exceed input voltage; reverse polarity will damage the unit. The onboard voltmeter only functions when the input is at least 4 V, so confirm your source meets that threshold before relying on the display.

Efficiency Drops With Wide Voltage Gaps

Peak conversion efficiency reaches 96 percent, yet the 100 W rating applies only when both input and output exceed 20 V; otherwise maximum power falls to 65 W. Low input voltage or a large differential between input and output reduces current capacity and efficiency, so sustained loads should be planned within those derated limits.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 99% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product type100 W

Questions about this item

What comes in the box with the FP5139 100W DC boost converter, and do I need to buy wires or a power source separately?

The module itself is supplied. You must provide a DC source between 3 V and 35 V capable of up to 9 A, plus suitable wiring and a load that needs a higher voltage than the source.

The specs list 100 W and 65 W maximum power — which figure applies to my 12 V battery project?

With a 12 V input the converter cannot reach the 20 V threshold, so the practical limit is 65 W; the 100 W rating only applies when both input and output exceed 20 V.

The headline says 100 W — what does that mean once the board is installed in a real circuit?

It is the peak power available only when the supply and the load are both above 20 V; at lower voltages such as a 12 V battery the continuous capability drops to 65 W, and efficiency falls if the voltage gap is large.

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