Electronic Project

Low cost 3.7V to 5V 6V DC to DC converter - Electronic Project

Introduction:

Sometimes while making the circuits diagram, we get in a difficult situation where we want some more supply than the power supply available. For example, we only have 3V DC available but we need 9V and 12 V DC. At this time, the circuit diagram known as the “boost converter” gets utilized. It helps to boost up the input DC voltage and provide it at the output of the side so that it may get used by the other device that needs the greater voltage. In this tutorial, we are going to “3.7V to 5V Boost to Converter”.

Conversion from lower to higher voltage is not that difficult as we have already learned about the AC to DC of the converter. But, this circuit diagram is about DC to DC conversion. To increase the input voltage at the output load, the circuit diagram commonly known as a voltage booster is used. As the name implies, it takes the input of the voltage and with the help of some components transforms that voltage into high voltage. The circuit diagram can be made using different methods like inductors, capacitors, semiconductor switches, etc. But, for efficient output, some voltage of the regulator ICs are also available in the electronic market. Hence, we would use one of them in our project. With the IC ME2108A33P, this circuit diagram also uses the Schottky diode SS14.

In this circuit diagram of the 3.7V to 5V Boost Converter, the major component is ME2108A33P IC. The internal structure of this IC is so promising and that is why it requires very few components for its external circuitry. The IC has 3-pins. It uses a maximum of the switching frequency of 180KHz. This IC can deliver 400mA output current flow if the input voltage is 3.0V and the output voltage is fixed at 5.0V. On the input of the side, we have connected the inductor. By changing the value of the Inductor and output capacitor you can adjust the output of the voltage range. The Schottky diode SS14 is also wired at the input side, usually used to prevent the circuit diagram from reverse polarity. At the output, the capacitors are there to observe the readings.

Diagram of Mini DC 3.7V 5V to 3.3V Down Conversion:

Hardware Required for this Project:

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Working Principle of 5V Boost Converter Step-Up Power:

The heart of the circuit diagram is the switching regulator IC MC34063A. Two different diodes of the 1N5819 & 1N4007 are used to drop down the voltage. The Schottky diode 1N5819 has a drop-down voltage of 0.3V or Diode 1N4007 has 0.7V. As MC34063A works up to 40V, thus The circuit diagram works with DC voltage in the range of 3.0V to 40.0V. We are using 3.7V as input from the lithium-ion of the Battery. The output of the circuit diagram is designed to give a fixed 6V. The diode 1N4007 reduces the 6V output of the voltage to around 5.3V. The Schottky of the diode further reduces 5.3V to around 5.0V.

The total maximal output current flow from all output terminals is around 100mA. The current flow can be adjusted with the help of resistor R1 in the circuit. For the fixed 5V of the output, a load always needs to be connected between 220ohm to 470ohm. Thus a single circuit diagram can be used as a 3.7 to 5V Voltage Booster Circuit diagram or a 5.3V or 6V Booster. The MC34063 can also be used as a DC-to-DC Boost to Converter to boost 3.7V to 9V.

An input DC voltage of 3.7V is applied to the connector of the CON1. The circuit diagram works with DC voltage in the range of 3.0V to 40.0V. IC1 works as a step-up converter to produce a 6V output of the voltage (VOUT1), which is available at connector CON2. For Schottky diode D1, you could use any of the 1N5817, 1N5818, and 1N5819 variants. Diode D3 reduces the 6V output of the voltage to around 5.3V (VOUT2), which is available across of the connector CON3. Schottky diode D4 further reduces 5.3V to around 5.0V (VOUT3), which is available across the connector CON4.

The post explains how we can make a DIY 3.7V to 5V Boost Converter of the Module for 3.7V Lithium-Ion Batteries. A single cell Lithium-Ion Battery of the Voltage ranges from a minimum of 3.2V to 4.2V. It is not sufficient to power supply those circuits that require 5V or more. Thus we need to step up the voltages up to 5V. Thus DC-to-DC Step-up converter circuit diagram is required which is also called a Boost Converter.

Not only Lithium-Ion or Lithium Polymer Battery but the circuit diagram can also be used for the Samsung 18650 Battery. The important element of the circuit diagram is the Boost Converter IC. So we can use MC34063 IC which is the most popular of the switching regulators in such applications. MC34063A is ideal for small projects that need DC-to-DC of the Converters. The circuit diagram that I am gonna show here will step up the voltage into 3 different levels 5V, 5.3V & 6V.

Frequently Asked Questions

Can 5V charge 3.7 V?

Charging a 3.7V battery with a 5V charger could be risky and potentially damaging to the battery. Most lithium-ion batteries, including those with a nominal voltage of 3.7V, require a specific charging voltage and current flow to ensure safe and efficient charging.

What is the minimum voltage for 3.7 V?

Your 3.7V lithium-ion battery could be considered dead (completely discharged) at a voltage of 3.4V. Your battery must not discharge beyond 2.75V (mini-safe voltage), as it could reduce its life.

What is A 3.7 V battery used for?

These cells are built to excel in a wide array of applications, from Torches & Flashlights to Search Lights, Solar Lights, Power supply Banks, Battery Packs, Battery Powered Toys, Medical Equipment, and more. Wherever you need a dependable rechargeable power supply, these lithium cells deliver.

How do you charge A 3.7 V?

For safe charging of 3.7 V Lithium-ion batteries, they should be charged at the constant-current flow of 0.2 to 0.7 times their capacity, till their terminal of the voltage reaches 4.2 V, later they would be charged in constant-voltage of the mode till the charging current flow drops to 10% initial charging rate.

How do you charge A 3.7 V device?

You connect the cell to a charger, or the charger to a power supply. The charger might include the necessary boost circuitry to full charge (~4.2V) the battery off a 3.6V supply. A 3.7V battery could drop down to 3.2V or even lower, directly connecting it to a 3.6V supply could cause it to do a fire dance.

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