Ultra low power power supply - Electronic Circuits Projects Diagrams Free

steevke · 2nd February 2006, 11:04 PM

Hello,

I'm working on a small hobby project and battery life is important.

Main components are an ATMega168V micro, ultra low power LCD, some op-amps with powersave, all at 3.3 Volt.

As soon as the unit isn't used, it drops into sleep mode, disables the lcd and opamps, and only keeps the RTC running. However, at that moment the power supply consumes much more power than the micro.

I've heard of people adding supercaps so they can disable the power supply and keep the micro running on the supercap. As soon as more power is needed or if powercap is nearly depleted, switch on the power supply again to recharge the cap. (I planned on using the TI tps60205 that has can be shutdown.)

Does anybody have any pointers to these kind of circuits? I've googled around a bit but don't seem to find that much information. I'm fairly inexperienced hardware wise, so any help would be appreciated.

Thanks in advance

Steven

Oznog · 3rd February 2006, 04:46 AM

Your part already has skip-pulse circuit, which is a more efficient and effective implementation of the same concept.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

2nd February 2006, 11:04 PM	#1
steevke	Ultra low power power supply Hello, I'm working on a small hobby project and battery life is important. Main components are an ATMega168V micro, ultra low power LCD, some op-amps with powersave, all at 3.3 Volt. As soon as the unit isn't used, it drops into sleep mode, disables the lcd and opamps, and only keeps the RTC running. However, at that moment the power supply consumes much more power than the micro. I've heard of people adding supercaps so they can disable the power supply and keep the micro running on the supercap. As soon as more power is needed or if powercap is nearly depleted, switch on the power supply again to recharge the cap. (I planned on using the TI tps60205 that has can be shutdown.) Does anybody have any pointers to these kind of circuits? I've googled around a bit but don't seem to find that much information. I'm fairly inexperienced hardware wise, so any help would be appreciated. Thanks in advance Steven

3rd February 2006, 04:46 AM	#2
Oznog	Your part already has skip-pulse circuit, which is a more efficient and effective implementation of the same concept. __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.