Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Low battery shut-off - best way?

Status
Not open for further replies.

lee321987

Member level 5
Joined
Apr 3, 2011
Messages
86
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
1,987
Hello, I'm building a DC-DC boost converter, it's called the Mintyboost - here is the link:
Minty Boost! - USB charger for your gadgets

It takes 2 AA batteries and boosts them to 5V so you can charge USB devices.

I'm going to use NIMH rechargeable batteries, so in order to avoid over-discharging my batteries, I need to make the device shut off when the batteries are below a certain level. I was thinking ~2.2V.

What would be the least power-consuming way to do this? Or the best way, or any thoughts you have on this...?
 

Use Transistor as a switch to on -off.
 

How would I make the transistor turn off when the supply is 2.2V?
 

you can make a low queicent current Undervoltage Lockout block to turn off the transistor. typically, the Iq of the UVLO is about 5uA.
 

Is there an IC that is a UVLO? I can't find one. Is there another name for them?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top