DIY 3.7V to 9V Boost Converter Circuit using MC34063

Overview
In this post, we will learn how we can design a
3.7V to 9V Boost Converter Circuit
using
MC34063
DC−to−DC converter IC. Most of the time we only have a battery as a power source. The
lithium-Ion
or
Lithium Polymer Battery
can produce a voltage of 3.7V. The 3.7V may not be enough to drive certain circuits where the power requirement is high. Hence, we need to convert the
low power DC
, to
high power DC
without the need for any additional large component.
In this case
DC−to−DC converter
comes into the frame.
DC-DC converters
are widely used to efficiently produce a regulated voltage from a source that may or may not be well controlled to a load that may or may not be constant. A
Buck Converter
outputs a lower voltage than the original voltage, while a
Boost Converter
supplies a higher voltage.
In this circuit we will convert the voltage from
Lithium-Ion Battery
to
9V
. The device uses an
inductor
and a few resistors or capacitors along with
MC340C3 IC
. The 3V to 9V
Boost Converter
Circuit can be used to power the device that requires higher voltages for operations. You can check one of our previous post for designing
3.7 to 5V Boost Converter
using the same MC34063 IC.
Bill of Materials
The list of components that we need for designing
3.7V to 9V Boost Converter Circuit
is given below. You can purchase all the components from Amazon.
S.N.
Components Name
Description
Quantity

MC34063
DC-DC Converter IC

1N5819
Schottky Diode

100uH
Inductor

100uF
Capacitor

1nF
Capacitor

6.2K
Resistor

1K
Resistor

180 0hm
Resistor

0.22 ohm
Resistor

3.7V Battery
3.7V Lithium-Ion/Lithium Polymer 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%
3.7V to 9V Boost Converter Circuit/Schematic
The heart of the circuit is the switching regulator IC MC34063A. The
1N5819
is a
Schottky diode
with a low forward voltage drop and high switching speed. It is commonly used in high frequency applications like
Inverters
or any
DC-DC converters
etc.
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. MC34063A can provide a high output switch current up to
1.5A
we need to provide a specific inductor. It can provide
adjustable output voltage
and has short circuit
current limiting
and low standby current. The current can be adjusted with the help resistor
R1
in the circuit. For the fixed
9V output
, we connect a 100uF capacitor. It will filter an excess
noise
from the power supply out.
Circuit Assembly & Testing
Initially, you can use the breadboard to assemble the circuit. It is a good idea to first test the circuit on a breadboard before going for the PCB part.
You can connect all the components with each other on a breadboard. After the circuit assembly, you can power the circuit using a 3.7V Lithium-Ion Battery as input. The output is taken from the 100uF capacitor. The circuit immediately shows 9V output on a multimeter after supplying input voltage.
The MC34063 9V Boost Converter circuit works very fine. But a little higher voltage is observed on a multimeter. This is because of the breadboard metallic surface which adds extra resistance to the circuit. This can be eliminated if you assemble the circuit on a Vero board or a PCB Board.
Once you assemble the circuit on the PCB Board, you can again connect a 3V or 3.7V Battery to the input. As soon as you connect the battery, the output of 9V is shown in the multimeter. This time the circuit is stable and the output is exactly around 9V. This is how you can use MC34063 as 3v to 9v boost converter.
Project PCB Gerber File & PCB Ordering Online
If you don’t want to assemble the circuit on a breadboard and you want PCB for the project, then here is the PCB for you. The PCB Board for the 3.7V to 9V Boost Converter is designed using
EasyEDA
online Circuit Schematics & PCB designing tool. The PCB looks something like below.
The Gerber File for the PCB is given below. You can simply download the Gerber File and order the PCB from
ALLPCB
at
1$
only.
Download Gerber File:
3.7V to 9V Boost Convereter PCB
You can use this Gerber file to order high quality PCB for this project. To do that visit the
ALLPCB
official website by clicking here:
https://www.allpcb.com/
You can now upload the Gerber File by choosing the Quote Now option. From these options, you can choose the Material Type, Dimensions, Quantity, Thickness, Solder Mask Color and other required parameters.
After filling all details, select your country and shipping method. Finally you can place the order.
You can assemble the components on the PCB Board.
Video Tutorial & Demonstration
DIY 3.7V to 9V Boost Converter for Stepping up Lithium-Ion Battery Voltage
Watch this video on YouTube