Low power DC/DC 3-output converter to work off single 6F22 battery

[Pszemol]

Could you please recommend some design of DC/DC converter to
power a couple of JFET op-amps out from single 6F22 battery?
Discrete solution would be fine, but preferably some smart IC.

I am talking about quad JFETs like LF444 consuming only
200uA each. They require +/-15V, minimum +/-12V and
most DC/DC converters I know do not work well with input
voltages in the range 6F22 battery generates through
its life (5-9V) or they do require bigger minimal output
current to not flood the circuit with a ripple...

I am trying to assemble measuring instrument and beside
op-amps requiring +/-15V in the analog part I have also
digita part with small CPU w/ADC requiring a couple of mA
on 5V or 3.3V... The optimal power supply IC would be then
tri output voltage DC/DC device with +/-15V and +5V...

Any ideas?

 

[Luhan Monat]

Could you please recommend some design of DC/DC converter to
power a couple of JFET op-amps out from single 6F22 battery?
Discrete solution would be fine, but preferably some smart IC.

I am talking about quad JFETs like LF444 consuming only
200uA each. They require +/-15V, minimum +/-12V and
most DC/DC converters I know do not work well with input
voltages in the range 6F22 battery generates through
its life (5-9V) or they do require bigger minimal output
current to not flood the circuit with a ripple...

I am trying to assemble measuring instrument and beside
op-amps requiring +/-15V in the analog part I have also
digita part with small CPU w/ADC requiring a couple of mA
on 5V or 3.3V... The optimal power supply IC would be then
tri output voltage DC/DC device with +/-15V and +5V...

Any ideas?

Hi,

How about CMOS op amps like LM662C? You can run them from just 5 volts
and then bias the inputs to 2.5v. Use a 'low drop out' regulator to
make your 5 volts from the battery.

Luhan