DIY 3.7V to 5V Boost Converter for Lithium-Ion Battery

Overview: 3.7V to 5V Boost Converter for Lithium-Ion Battery
The post explains how we can make
DIY 3.7V to 5V Boost Converter Module
for
3.7V Lithium-Ion Batteries
. A single cell L
ithium-Ion Battery
Voltage range from a minimum of
3.2V
to
4.2V
. It’s not sufficient to power those circuits which require 5V or more. Thus we need to step-up the voltages up to 5V. Thus DC-to-DC Step-up converter circuit is required which is also called as
Boost Converter
Not only
Lithium-Ion
or
Lithium Polymer Battery
but the circuit can also be used for
Samsung 18650 Battery
. The important element of the circuit is
Boost Converter IC
. So we can use
MC34063 IC
which is the most popular switching regulator in such applications. MC34063A is ideal for small projects which need
DC-to-DC Converters
. The circuit that I am gonna show here will step up the voltage into 3 different level like 5V, 5.3V & 6V.
In one of my previous post I explained about
Buck Converter using XL4015
. You can follow the post if you want to learn more about the
Buck Converter
. Similarly, I also explained how you can design Simple
Lithium-Ion Battery Charger Circuit
using MCP73831 IC.
Bill of Materials
Following are the components required for making the 3.7V to 5V Boost Converter project. All the components can be easily purchased from Amazon.
S.N.
Components
Description
Quantity

MC34063
Boost Converter IC

Resistor
0.47 Ω

Resistor
180 Ω

Resistor
2.2 K Ω

Resistor
2.7 K Ω

Resistor
10 K Ω

Resistor
470 Ω

Capacitor
470 µF, 16V (Electrolytic Capacitor)

Capacitor
100 µF, 16V (Electrolytic Capacitor)

Capacitor
100 nF, Ceramic Disk

Capacitor
470 pF, Ceramic Disk

1N5819
Schottky diode

1N4007
Rectifier diode

LED
5mm Any Color

Inductor
100uH

Power Supply
3.7V Lithium Ion Battery

MC34063 IC
The
MC34063A Buck-Boost Converter
IC is a monolithic control circuit containing the primary functions required for
DC−to−DC converters
. The IC consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active
current limit circuit
, driver, and high current output switch. The IC was specifically designed to be incorporated in
Step−Down
and
Step−Up
and
Voltage−Inverting applications
with a minimum number of external components.
Features of MC34063 IC
1. Operation from
3.0 V
to
40 V
Input
2. Low Standby Current
3. Current Limiting
4. Output Switch Current to
1.5 A
5. Output Voltage Adjustable
6. Frequency Operation to
100 kHz
7. Precision
2%
Circuit: 3.7V to 5V Boost Converter for Lithium-Ion Battery
The heart of the circuit is the switching regulator IC
MC34063A
. Two different diodes like
1N5819
&
1N4007
are used to drop down the voltage. The
Schottky diode 1N5819
has a drop down voltage of
0.3V
and Diode 1N4007 has
0.7V
As MC34063A works up to
40V
, thus The circuit works with DC voltage in the range of
3.0V
to
40.0V
. We are using 3.7V as input from
Lithium-Ion Battery
. The output of the circuit is designed to give fix
6V
. The diode
1N4007
reduces the 6V output voltage to around
5.3V
. The Schottky diode further reduces 5.3V to around
5.0V
The total maximal
output current
from all outputs terminal is around
100mA
. The current can be adjusted with the help resistor R1 in the circuit. For the fix 5V output, a load always needs to be connected as between 220ohm to 470ohm. Thus a single circuit can be used as
3.7 to 5V Voltage Booster Circuit
or 5.3V or 6V Booster.
The MC34063 can also be used as DC-to-DC Boost Converter to boost
3.7V to 9V
. You can use this Circuit in this project:
Power Supply for NodeMCU