Simple 5V to 12V Step Up DC-DC Boost Converter circuit

Are you in search of a reliable and high performance but simple 5v to 12v boost converter circuit? So here, in this comprehensive post, we have provided an insight of  DC to DC Boost Converter & Modules, its schematic circuits, datasheet, pinout, features, and intended applications.

These step up DC to DC boost converters are readily accessible either as a per-assembled module or as an IC (integrated circuit) unit available for online purchase. With a lot of options to choose from this post will focus on the  circuits using boost converter ICs that are highly efficient and popular among the engineers community.

In this post we will be avoiding using the old school method and only focus on boost converters with simple ICs. Earlier methods or you can say older methods used transistors as a switching device externally and lots of components were required to implement it making it complex. That is the reason to go with ICs and modules. Also it will save a lot of time to center your attention towards the actual functioning of the project rather than the power supply.

This information is sure to be of immense value to you, especially if you’re planning a project involving dc dc buck converters or a power supply circuit.

If you’re looking to power your micro-controller based project or its associated peripherals, we would highly recommend procuring a DC to DC Step-Up module. Not only are they designed to occupy minimal space, but also many of these modules have adjustable output voltages, making them ideal for a wide range of applications.

5v to 12v Boost Step Up Converter using IC LM2577

Below schematic is implemented using readily available Lm2577-ADJboost converter IC having adjustable output feature:

Components required:

2 pin screw connector x2
IC Lm2577-ADJ
Inductor-> L3≥100uH
Switching diode (Schottky diode): D3=IN5821
Capacitor: Cout≥680uF, Cin3=0.1uF, Cout3=0.33uF, R7=2.2kΩ
R6 = 2.0kΩ
R5 = 17.4kΩ

Working:

As this is an Adjustable version of step up voltage regulator/ boost converter, we have to select the value of output voltage (here 12v) which is directly dependent on voltage determining resistors (here R5 and R6).

The value of R5 and R6 can be determined using this formula:
Vo=1.23(1+R5/R6)
Where 1.23= Vref (reference voltage of the IC)

Here, we need Vo = 12V, then assume the value of either R6 or R5 then calculate for the other.
Eg. choose R6=2.0kΩ, put the value in the formula, we get R5=17.4kΩ. Hence the values.

With the voltage boost converter module with IC Lm2577-ADJ, you can draw 12V @800mA stable DC voltage output at a wide range of input voltage levels from 3V to 40V. The LM2577 is designed with an 3.0A NPN switch, which is also equipped with a thermal and current limiting protection circuit.

In short, this programmable IC must be programmed by adjusting the feedback voltage, which is determined by changing R6 and R5. This DC-DC boost converter module operates at the frequency 48kHz-53kHz.

Check simple 12V to 5v converter dc to dc buck in detail

5v to 12v Boost Converter using fixed output step up voltage regulator IC LM2577-12

The intended output can also be drawn out using a fixed output 12v switching IC Lm2677-12 which comes under the lm2577 series step-up voltage regulator, image for schematic circuit is shown below:

All the components value for this schematic will be same as that of previous circuit.

This circuit does not use the external resistors for reference voltage. It has an on-chip voltage reference circuit made for 12v output, the only requirement is to connect pin number 2/ feedback pin directly to the output end as shown in the circuit.

Features:

• Requires minimal external components.
• Soft start function (reduces current ripple and spikes during start-up, by limiting the initial current flow).
• Capable of delivering maximum output current up to 3.0 Amp and maximum output voltage of 60V .
• In-built oscillator with 52KHz frequency with power conversion efficiency up to 92%, higher the output voltage higher is the efficiency.
• Refer to the datasheet  for in-depth technical parameters.

Application:
Simple boost regulator, fly-back and forward regulators, multiple output regulators, battery charging.

Dc- Dc Boost Converter 5v to 12v using IC MT3608 DIY

Below schematic is implemented using variable output high efficiency IC MT3608. A compact and small form factor of this module/IC makes it possible to install this IC in size and weight imperative devices. Also works on very low current drawing loads contrary to its competitors.

It depends on the input voltage and current, the amount of the maximum stable output current is produced.  These DC-DC boost converter modules operate at the frequency ≥1.2MHz, the typical efficiency is 93% subjected to the withdrawn load current.

For an input of 5v, the output of this IC’s can deliver a maximum of 800mA at 88% efficiency. For higher output current you have to increase the input voltage above 5 Volts.

Components required:
IC MT3608 series
Inductor L≥22uH
Switching diode/ (Schottky diode); D=SS34
2 no. of Capacitor C≥22uF
Resistor, R1 = 21kΩ
R2 = 1.1kΩ

Working:

With the step up converter module with IC MT3608, you can achieve 12V stable DC voltage output at a wide range of input voltage above 2.0V. But for higher efficiency and higher current input voltage must be kept higher. Under-voltage lockout occurs if the input voltage drops below 1.98V, at this voltage the IC will be shutdown.

The value of R1 and R2 can be determined using this formula:
Vo=0.6(1+R1/R2)
Where 0.6= Vref (internal reference voltage of the IC)

Here, we need Vo = 12V, so let’s assume either R2 or R1 and find for the next.
Eg. choose R2=1.1kΩ, put the value in the formula, we get R1=21kΩ.

Features:

• The output is protected from thermal overload.
• Input voltage could  be between from 2.0 to 24V
• Maximum output current up to 2.0 Amps at 24V.
• Switching frequency is 1.2MHz and typical conversion efficiency is up to 93%

Application:
Battery-powered portable equipment, set-top box, lcd bias supply, Wifi Router.

Datasheet for lm2577

USB 5v to 12v step up converter

The USB 5v to 12v dc dc converter is a compact portable electronic  device that is designed to boost up 5 volts from the USB port to 12 volts efficiently. As we know that 5 volt USB supply is available everywhere but what if we require a 12 volt power supply for any application then this device comes to the aid.

This USB 5v to 12v converter is most useful for powering up the WiFi router and decorative LED strip.

It has the same or similar step up voltage regulator inside, that we have discussed above.

This USB power converter makes it very portable in day-to-day use, and it can be connected to a USB port, through either a mobile phone charger or a power bank, or any USB type A socket.

Product description:

• Input Voltage: DC 5V (USB)
• Output voltage: DC 12V max @800mA
• Max input current: 2A
• Important: DC Pin Polarity: Outer pin (-ve )Negative and Inner pin (+ve)Positive

Conclusion:

We hope this 5v to 12v DC Boost up converter circuit will prove to be a value addition resource for your DIY and engineering projects. If you have any comments, feedback, or questions regarding these circuits, please do not hesitate to share them below.