Wednesday, April 24, 2024

Low-Power 5V Supply From Cells – 5V Boost Converter Circuit

efy tested

Obtaining 5V from AA or AAA cells is a difficult task in terms of high efficiency and a low component count. Classic boost converter circuits are challenging to implement in portable devices like wireless mice, remotes, etc.

Presented here is a 5V Boost Converter Circuit that generates 5V from 1.5V or any single cell by using only three external components. The prototype assembled on a double-sided PCB is shown in Fig. 1.

DIY 5V Boost Converter Circuit
Fig. 1: Author’s prototype: (a) solder side, (b) component side

POC Video Tutorial In English:

The components required for this 5V Boost Converter Circuit to generate 5V from single cells are listed below-

Bill of Materials
1N5819 (D1)1
On-off switch (SW1)1
22µH inductor (L1)1
100µF, 16V (C1, C2)2
2-pin connector2

5V Boost Converter – Circuit and Working

Pulse frequency modulation (PFM) is a switching method normally used in many DC-DC voltage converters to improve efficiency at light loads.

The circuit is built around PFM DC-DC boost converter chip CE8301 (IC1), an inductor 22µH (L1), a Schottky barrier diode 1N5819 (D1), and a few other components.

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A single 1.5V cell is connected to connector CON1. Switch SW1 is used to turn on/off the circuit.

When the switch is closed, IC1 and inductor L1 perform the step-up operation, and the 5V output voltage is available at CON2.

Capacitor C2 is used to reduce the voltage ripple in the output voltage, while capacitor C1 acts as a buffer.

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