Lpc2000

Hi Lasse.

What's your input voltage and current requirements?  National has a series of LDOs that should work, but they are in a SOT-23 5 pin package.    The LP39xx series have a maximum input voltage of about 6 volts and can supply around 150 to 300mA.  The LP29xx has a maximum input voltage of 16 volts and the quiescent current varies greatly with the load as you can see below.  

Quiescent current
LP3985 - 140 to 200uA  (1 to 150mA output)
LP3981 - 170 to 210uA  (1 to 300mA output)
LP2985 - 75 to 2500uA  (1 to 150mA output)
LP2992 - 75 to 4000uA  (1 to 250mA output)


Ron

________________________________________
From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf Of Lasse Madsen
Sent: Tuesday, August 02, 2005 5:06 PM
To: AVR-Chat@yahoogroups.com; lpc2000@yahoogroups.com
Subject: [lpc2000] OT: Voltage regulator (TO-252)

Hi All,

I have a problem and maybe you can help me.

I've designed a board with two LM1117 LDO regulators which are set to 3.3V
and 1.8V they work fine... except that they both draw 5.1mA in quiescent
current which makes my battery driven application useless... (I know it is
stated in the datasheet but I didn't think when I made the decision to use
it)

The housing for these monsters are TO-252 arranged in this way:

Pin:

  3 Voltage input
2   Voltage output
  1 Adjust pin

Where pin 2, is the tap and the footprint is viewed from above.

I will never draw more than 75mA in my application on the 3.3V rail and
about 5mA on the 1.8V rail

If you've heard of any regulator with a lower quiescent current please speak
up I've been searching the net for hours now but unable to find anything...

Even a leaded TO92 style regulator would be fine as I'm desperate...

Best regards
Lasse Madsen


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