Date: 8 Aug 1996 From: Edmond Duggan To: Multiple recipients of list Subject: Low Drop Out Regs Someone from HP was looking for a 5 volt regulator in a to 92 case; since I use to do this for a day job, and a good friend suggested I help since I have a great collection of data books. The 78m05 should be your last resort, since it is probably the worst I can suggest, but very available worldwide. TI makes them, probably others. TelCom, (formerly Teledyne) has the TC45 series which claims to consume only 1.1 uA and drop .5 V at 60 mA draw. they are available in 2.0 to 6.0 V in .1 V steps, and are 2.5% tol. Max current is 120mA. The TC46 series are available in the same range and power consumption, but only go to 80 mA output, but the drop is 30mV at 1mA The TC55 series consume max 3 uA, but drop 380mV when supplying 200 mA and max out at 250 mA loads. Micrel makes a LP 2950 which consume 10 mA supplying 100 mA with a drop out of 380 mV. They also make their own version, the MIC 2950/2951 which handles 150 mA and drops 250 mV at 100 mA but includes a positive transient of +60 V and can handle a reverse polarity of -20 V. Of course the dip package has nice features as an error flag (warns when battery is about to die), a shutdown function, and can be programmed to provide from 1.24 V to 29 V output. Also available in surface mount (so8) The Mic 2954 has this and more, and supplies up to 250 mA. You might even want to look at a Sekio low power book (mine has left me). They have some amazing devices. As you can see, you have a lot of choices, perhaps calling up your local electronics supplier and asking about these devices might lead to something you can use, rather than asking blindly in a mailing list. Any salesman worth his/her weight should be able to source what you need, and willing to help you on selection and availibility too. Hope this helps many HC11 fans. PS: I'm in a very kind mood, so if anyone else wants a little research, just let me know. PPS: If your from HP, Tektronics, or any other electronic company a scope or a logic analyzer might be nice. :-) Edmond Duggan Edmonton, Alberta, Canada R/C Electrics, 68HC11, Photography