Help for Power Pushbutton Circuit Design

Hi.

I need to design a Power Circuit for a Battery (Li-Poly, 3.7v) powered Device.

I want a to use a Powerbutton (Pushbutton, Mom-Off) for Power ON/OFF. Like:

- Press the Powerbutton - Power ON the Device.
- Press the Powerbutton and Hold for few sec - Power OFF the device.

Can anyone refer any power management Chip? Or any Schematic also appreciated.

Thanks in advance.

Regards.

Just check this

http://www.extremecircuits.net/2010/06/on-and-off-button.html

Hi.

Thanks for your reply.

My power Source is 3.7 (Li-Poly). Basically I am looking for a small circuit with very less components. Like - Transistor based or a dedicated chip based. So it can consume less space on PCB.

Any other solutions please.

Regards.

There are manu PMICs available with on/off control but not as you want. they are just logic high or low kind of ICs. You can check PMICs from TI, Semtec, microchip etc.

But you can use a small 8-pin micro (AVR/PIC, SMD will be even smaller) for doing this job. you can use one of the GPIO for controller your power assembly.

Refer to the referenced video blog for an exquisite walk-through

Try this one as well & go on & characterize each of the above in terms of power consumption...etc and see which one suits your needs.