# 3V to 9V DC Boost Converters

Here are some 3V to 9V DC boost converter circuits that were requested by some of our visitors. It may be helpful to have one of this converters when no 9V battery is available or if you consider that they are too expensive. The first circuit is very simple, it uses the TL496 power supply controller, a coil and a electrolytic capacitor.

TL496 3 to 9 volt converter circuit

The maximum output voltage is actually 8.6V and current is around 80mA.
The input current (the current drawn from the batteries) is 405mA at the maximum output current. Without load the current consumption is 125µA and the batteries life is around 166 days.

Here is another 1.5… 4.5V to 9V converter

3 volt to 9 volt with LMC555
This dc converter is built with the CMOS version of 555 timer. You can get 12V too if you change the zener diode to a 12V version.

Probably there are more 3 to 9 volt dc converters but for the moment those are the only ones presented in this article.

## Related Tutorials

• Colin Mitchell

How to modify this circuit to get 150mA? I need to charge a 9V battery, I have a 5V, 500mA power supply. I am guessing the coil is the key? I am not good with coils. The idea is the transistor grounds the coil so it does not conducts and then cuts the connection so energy can be stored for the zener to be able to support 9V?

No. You are completely wrong. Do not do anything until you study electronics for the next 5 years and then come back with your question.

• ArakelTheDragon

How to modify this circuit to get 150mA? I need to charge a 9V battery, I have a 5V, 500mA power supply. I am guessing the coil is the key? I am not good with coils. The idea is the transistor grounds the coil so it does not conducts and then cuts the connection so energy can be stored for the zener to be able to support 9V?

• tzudin

What component make this electronic circuit made the output voltage is 9V? what should I change if i want the output to 12V?

• poer

Do you have a scheme dc 3.7 volt to dc 5.0 volt 200mA ???

• samuel

is it possible to construct a boost converter using lm393 ic

• Jim Keith

I believe that it is possible and will attempt to come up with a circuit –with the extra comparator, it may be possible to add some voltage regulation.

• Colin Mitchell
• budhi nursyah

Do you have a scheme dc 9 volt to dc 12 volt ?

• Prince Ali

Since 3 months I have been searching for dc to dc boost converter to power my laptop; still i didn’t found any. Could you please design it for me. i love working/experimenting with electronic components.

input 12volts (car battery) to 19volts 3.24amps
output. (yes it is available in market but i wanna build my own to learn/know how voltage is boosted )

thank u very much !

• bilosta

Does someone have a scheme of lines of 1.5 -4.5 at 9 v. scheme lines for printed circuit boards

• Jim Keith

Good challenge! I have some ideas about how to do this. The main difficulty is obtaining an affordable power inductor that is available globally.

• Prince Ali

Plz let me know your ideas

• Jim Keith

12 to 19V converter: It is standard topology boost converter with series power inductor, shunt switching MOSFET, schottky rectifier and output capacitor.

With this inductor: BOURNS JW MILLER – 2306-H-RC – TOROIDAL INDUCTOR, 27UH, 15.6A, it will switch at about 14kHZ. Cost is US\$2.66 (promo price) from Newark Electronics. Will also require high current low ESR capacitor(s) on the output.

I have a means roughed out that will set current switching threshold and inductor discharge detection. Looks promising. Now for voltage feedback…

• arunKumar

3v/how many ?Amper input voltage

• Sebastian Kushero

Here is another 1.5… 4.5V to 9V converter is an excellent circuit and care must be taken to ensure input voltage does not exceed 5V

Looking for the latest from TI?