DIY 3.7V to 9V Boost Converter Circuit using MC34063

In this post, we’ll look at how to use the MC34063 DC-to-DC converter IC to create a 3.7V to 9V Boost Converter Circuit. From the time we know, our only power source is a battery. The lithium-ion or lithium-polymer battery has a voltage of 3.7 volts. The 3.7V may not be enough to power certain circuits that require a lot of power. As a result, we must convert low-power DC to high-power DC without using any additional significant components.

In this instance, a DC-to-DC converter is required. DC-DC converters are commonly used to efficiently generate a regulated voltage from a source that may or may not be properly controlled to a variable load. A Buck Converter produces a lower voltage than the source, whereas a Boost Converter produces a higher voltage.

The voltage from the Lithium-Ion Battery will be converted to 9V in this circuit. Along with the MC340C3 IC, the gadget includes an inductor and a few resistors or capacitors. The 3V to 9V Boost Converter Circuit can be used to power devices that operate at higher voltages. You may find a design for a 3.7 to 5V Boost Converter utilizing the same MC34063 IC in one of our earlier posts.

Components Required

  • MC34063-DC-DC Converter IC
  • 1N5819-Schottky Diode
  • Inductor-100uH
  • Capacitor-100uF,1nF,6.2K,,1K,180 0hm,0.22 ohm
  • 3.7V Lithium-Ion/Lithium Polymer Battery

MC34063 IC

The MC34063A Buck-Boost Converter IC is a monolithic control circuit that includes all of the essential functions for DC-to-DC converters. Internal temperature compensation, a comparator, a regulated duty cycle oscillator with an active current limit circuit, a driver, and a high current output switch make up the IC. The IC was created with the goal of using as few external components as possible in StepDown, StepUp, and VoltageInverting applications.


Features of MC34063 IC

  • Operation from 3.0 V to 40 V Input
  • Low Standby Current
  • Current Limiting
  • Output Switch Current to 1.5 A
  • Output Voltage Adjustable
  • Frequency Operation to 100 kHz
  • Precision 2%

3.7V to 9V Boost Converter Circuit/Schematic

The switching regulator IC MC34063A is the heart of the circuit. The 1N5819 is a Schottky diode with a rapid switching speed and minimal forward voltage loss. It’s frequently employed in high-frequency applications such as inverters and DC-DC converters.

3.7V to 9V Boost Converter Circuit

Since the MC34063A can function up to 40V, the circuit can work with DC voltages ranging from 3.0V to 40.0V. The input voltage from the Lithium-Ion Battery is 3.7V. We need to offer a specific inductor for the MC34063A to deliver a high output switch current of up to 1.5A. It has a variable output voltage, short circuit current limiting, and a low standby current. With the help of the resistor R1 in the circuit, the current can be changed. A 100uF capacitor is connected to the fixed 9V output. Excess noise from the power supply will be filtered away.

Circuit Assembly & Testing

To begin, you can assemble the circuit on a breadboard. Before moving on to the PCB, it’s a good idea to test the circuit on a breadboard.

A breadboard can be used to connect all of the components. After the circuit is assembled, a 3.7V Lithium-Ion Battery can be used to power it. The 100uF capacitor provides the output. After applying input voltage, the circuit exhibits a 9V output on a multimeter right away.

The circuit for the MC34063 9V Boost Converter works perfectly. A multimeter, however, shows a somewhat greater voltage. This is due to the metallic surface of the breadboard, which adds extra resistance to the circuit. If you build the circuit on a Vero board or a PCB board, you can avoid this.

You can attach a 3V or 3.7V battery to the input once the circuit is assembled on the PCB Board. The output of 9V is displayed on the multimeter as soon as the battery is connected. The circuit is now steady, and the output voltage is exactly 9V. This is how the MC34063 can be used as a 3v to 9v boost converter.

Project PCB Gerber File & PCB Ordering Online

If you don’t want to put the circuit together on a breadboard and instead prefer a PCB, this is the PCB for you.  EasyEDA online Circuit Schematics & PCB Design tool was used to create the PCB Board for the 3.7V to 9V Boost Converter. The PCB appears to be similar to the one seen below.

3.7V to 9V PCB

The Gerber File for the PCB is given below. You can simply download the Gerber File and order the PCB from

Download Gerber File: 3.7V to 9V Boost Converter PCB

Now you can visit the NextPCB official website by clicking here: So you will be directed to the NextPCB website.

You can now upload the Gerber File and place an order on the website. The PCB quality is excellent. That is why the majority of people entrust NextPCB with their PCB and PCBA needs.

The components can be assembled on the PCB Board.


I hope all of you understand how to design DIY 3.7V to 9V Boost Converter Circuit using MC34063. We MATHA ELECTRONICS will be back soon with more informative blogs.

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