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Simple Boost Converter Circuit from 3V to 5V

To change 3V to 5V we need to use a boost converter.

This Simple Boost Converter Circuit from 3V to 5V take low voltage and make it higher.

It takes 3V from battery and give 5V to run our devices.

Circuit Working:

Parts List:

CategoryComponentQuantity
Resistors (All resistors are 1/4 watt unless specified)3.9k1
560Ω1
2.2k1
CapacitorsElectrolytic 100µF 25V1
SemiconductorsTransistor BC3381
Transistor BC5471
Diode 1N41481
Coil 2.5mm x 7mm slug F29 material 35 turns, 20 turns1
Push button1

This article show how to make 3V to 5V boost converter.

Boost converter take 3V input and give 5V output.

It work by using transistor Q1 BC338 to switch battery current and store energy in inductor.

When transistor is OFF inductor make high voltage.

Diode 1N4148 pass this voltage and capacitor smooth it to get steady 5V.

Resistors 3.9k and 560 ohm make voltage divider to set reference voltage.

Formulas:

When making boost converter for 3V to 5V, some important calculations and things to we need to think about.

1. Find Duty Cycle D:

D = Vout / Vin

In this circuit:

D = 5V / 3V = 1.67

2. Find Inductor Value L:

Use formula:

L ≥ (Vout − Vin) * Vout / (f * ΔI)

where:

Note:

Parts like inductor, diode, transistor and capacitor must be chosen right for stable and efficient boost.

Exact values depend on what parts we use and what our circuit needs.

Test and try to get good result.

How to Build:

To build a Simple Boost Converter Circuit from 3V to 5V steps are mentioned below for connections of components:

Note:

Conclusion:

This Simple Boost Converter Circuit change 3V to 5V.

It use few parts like transistor, inductor, diode and capacitor.

This circuit is good for small projects and is easy to make if we know basic electronics.

Always check all the circuit parts connection and stay safe.

References:

Step up 3.3V To 5V

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