I started a project that needs -5V for a GLCD display and +5 volts for everything else. Actually, if it weren't for the display, I could use +3.3V for everything else.
At the outset, I used a MAX851 for the negative supply. It was in my box of parts, and unlike the ICL7660, it has a shut down pin. The +5V was from a bench power supply.
I am going from breadboard and bench power supply to a prototype with batteries. Lithium batteries are desirable, but NiMH is OK.
Can anyone suggest a voltage regulator/converter that produces -5V and +5V simultaneously from a single supply of lower voltage? The -5V doesn't need to be regulated. The +5V should be regulated as it drives a PIC and the display. Maximum current for the -5V is low, but undetermined. Maximum for the +5V is ≤100mA.
I have looked at the ST0D03B (http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00044917.pdf) which seems like it offers most of what I need. But, one cannot enable V+ and V- separately (the GLCD datasheet cautions against having V- without V+), the +5V is not regulated, and it has the DFN package. I prefer something like an SOIC for hobby work. I find DFN's hard to remove, but that is not a show stopper by itself.
Does anyone here have experience with that chip or other chips of similar function that you can recommend?
John
At the outset, I used a MAX851 for the negative supply. It was in my box of parts, and unlike the ICL7660, it has a shut down pin. The +5V was from a bench power supply.
I am going from breadboard and bench power supply to a prototype with batteries. Lithium batteries are desirable, but NiMH is OK.
Can anyone suggest a voltage regulator/converter that produces -5V and +5V simultaneously from a single supply of lower voltage? The -5V doesn't need to be regulated. The +5V should be regulated as it drives a PIC and the display. Maximum current for the -5V is low, but undetermined. Maximum for the +5V is ≤100mA.
I have looked at the ST0D03B (http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00044917.pdf) which seems like it offers most of what I need. But, one cannot enable V+ and V- separately (the GLCD datasheet cautions against having V- without V+), the +5V is not regulated, and it has the DFN package. I prefer something like an SOIC for hobby work. I find DFN's hard to remove, but that is not a show stopper by itself.
Does anyone here have experience with that chip or other chips of similar function that you can recommend?
John
