2.4V to 5V Step Up DC-DC Converter

  • Rajkumar Sharma
  • 87502
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Step Up Dc-DC

This project is a step up DC to DC power converter able to convert 2.4V – 5V to 5Vdc.

Description

This project has been designed around Texas Instrument’s LM2623 IC, The LM2623 is a high efficiency, general purpose step-up DC-DC switching regulator for battery powered and low input voltage systems. It accepts an input voltage between 2.4V to 12V volts and converts it into 5V DC. Efficiencies up to 90% are achievable with the LM2623.

Features:

  • Good Efficiency over a very wide load range
  • Very low output voltage ripple
  • 2.4V to 5V (Possible Input Supply up to 14V operating voltage)
  • 5V output voltage (Other output voltages possible by changing R3 and R4)
  • 600mA output current

Application:

  • Hand held instruments
  • Cameras, PDA, Cellphones
  • White LED driver

Schematic

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Parts List

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PCB

Downloads

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Nizam uddin

I like electronics lab.com

hakanak

Does it provide 5V continously even when the input is 2.5V ?

AlexRogers

will the output be stable if the Vin fluctuates?

panjooel

Sorry, i am really zero knowledge of this, and i dont know where to start learning. can i ask how much R3 and R4 should be for output around 3.3v-3.5v. thanx if you want share how to calculate it. 🙂

panjooel

yes, i see.. thanx for the link and reference page number..:) so if R4 is 100k, i just need R3 150-160K.. really thanks…

kim

What kind of inductor you used here and what is R2 0E?

kim

Can i use this inductor? https://www.amazon.com/uxcell-Axial-4-7uH-Color-Inductors/dp/B008MP0HS0. Can i ask the C5 too? Can i use a through hole capacitor? Thanks

kim

Can you recommend an alternative inductor that is not surface mounted because i need it for my project and we need to put it on breadboard. Thank you so much 🙂

kim

can i use electrolytic capacitor on C5?

kim

How about using a 1.5V or 6V battery for the input?

kim

can i use a polarize capacitor for C5?

kim

Can i use solar panel that’s 3V for the input instead of a battery?

kim

Hi! When i finished breadboarding the circuit and put an input voltage of 6 volts the output was 6 volts too. Why does it happened? 🙁

kim

Hi 🙂 I changed the input into 3V but the output is 3V too.

mixos

Please check for damaged diode or IC.

sangeeth sharma

what is the output A’s

Eddy

What are the exact dimensions of the pcb drawn in this page. Thanks.

Eddy

Can i use through hole components (on a new pcb) for all the parts (except the lm2623 of course) ?

Eddy

Thanks for answering.
Another issue : is there a way to improve the maximum output current to let’s say 1.5A or 2A. What are the modifications needed for this purpose? Thanks in advance.

rajeon

PCB Size 24.13X26.99MM

Eddy

Thanks

Eddy

Why the output is oscillating continuously between 4.8 and 5.3 V (not stable) ?

Eddy

Have rebuilt the circuit using your pcb (not the mine) and it works just fine. I’m using it to feed an audio amplifier rated at 6w (2x3w) so the current drawn is 1.2A (6w/5v) vs an announced nominal current of 500mA ?? Is there an explanantion.
Thanks.

James

where can I buy the components for this board?

Anil Tan

Hi i need to charge my samsung s8 with this kind of circuit via aa batteries. .So in need 2 A output. Are there any suggestion for me?

zidni

where i can buy the module? .. but if input 2.4 volt and current is 30 micro ampere, can work the module?

Andrea Poma

Hi Kumar,
could you send me the gerber file?
@ andrea-poma@hotmail.com
Thanks

md kamal ahamed

i need
@ 1-5 vdc to 5 vdc dc dc step up converter with 2000ma
@ intelligent emergency led light driver making circuit diagram . 230vac input and 4vdc utput. 3,7 or 4 vdc li ion battery back up.
ii want t make by myself. i need easy diagram with available parts.

DennisJensen

Hi. Please help me out here

My challenge: I need to boost 3V to 5V, and I need to do it yesterday. – I need something I can buy fast.

Can I buy 10 pcs of this or something smilair and where?

Perferably in Denmark, Europe, US, Asia – This due to the delivery time.

VERY big thanks for any help.

Dennis Jensen

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