- Is there one regulator device that can supply at least 1.2 Amps @ 5 VDC from a 9.8 - 14.8 VDC battery and also draw below 150uA in quiescent mode? I am currently using two regulators for this requirement. I must completely cut power to the high current regulator to achieve a 150uA sleep current as the quiescent current of any 1.2 Amp device I have seen is well above 150uA.
- The high current regulator is powered on for one minute and off for 9 minutes.
- LM2936 is used for the low quiescent current. 7805 type is used for the high current regulator. The high current regulator is powered on and off by a PVG612 optical relay as this device has very little off state leakage. This designe is from 17 years ago. Surely now there is a single device that can do all this without creating so much heat.
- This regulator system is used to power a microcontroller that charges batteries and controls the telemetry devices for my agricultural research project published here. Thank you in advance.
There are quite a lot available from Linear Tech, this page allows you to select by parameters, I've included the "shutdown current" column and set a max of 1uA, the other parameters were entered in the basic box at the top left:
http://www.linear.com/parametric/Switching_Regulator#!cols_1038,1646,2167,1107,1035,1034,1105,1041,1033,1032!s_0,0!gtd_!1032_%3C=9!1033_%3E=15!1107_1.2:1.8!1646_Buck!1105_%3C=5!1034_%3E=5!1041_%3C=1
Excelllent idea. I found a qualifying device. Thanks George and
Aparna. It is the
LT1529-5
Hi Jeff, there are quite a few ready made modules out there also, for example using the MP1584
https://www.ebay.co.uk/sch/i.html?_odkw=mp184&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xmp1584.TRS0&_nkw=mp1584&_sacat=0
Switching regulators have really taken off in the last few years. They are very efficient and you dont have to try and dissipate any big heat loads. With a bit of extra fiddling, you could maybe charge up a big capacitor to 5V (when you are using the high power outuput) and then use this to power the microcontroller in the off time. (Starting up the high power regulator in a fail safe if the 5Vs on the capacitor drops too low).
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