Other Parts Discussed in Thread: LM2664, TLV61046,
Hello,
I recently started a thread in the Amplifiers Forum and was recommended to followup in Power Management forum: https://e2e.ti.com/support/amplifiers/f/14/p/742175/2745962#2745962
Basically, my product requirement is to measure input signals that can be within 5mV of either rail with accuracy better than 10mV (1mV preferred). We determined that extending the power rails will be necessary to achieve my goal, and I wanted to validate the parts I'm considering from browsing your power supply suggestion as well as using TI's WebBench Power Designer.
My design has input power supply of 8-20V and I've got a 5V regulator as well. I have a good amount of flexibility in the rails, but am currently consider +24V and -3V. I plan to use the TLV07IDR with a 4k resistor divider on its output, so total current draw per channel is ~7mA. There are two channels, so I'll want a power supply capable of 20mA.
Currently, I'm considering using TLV61046 to create the upper rail at 24V. I'm considering the LM2664 for generating the negative rail at -5V. Both of these would use regulated 5V as the input. I was also considering the MC33063 (perhaps with deregulated components as I don't need anywhere near 1.5A), but am hesitant as the webbench tool didn't even suggest this.
Can you provide any insights on the parts I'm planning to use for this application and any other options you may suggest?
