Unable to model LTC3260 in LTspice

Kapila

on Jun 19, 2023

Category: Hardware

Product Number: LTC3260

Software Version: 17.1.8

Hi,

I'm trying to model LTC3260 for potential use as a low noise bipolar supply for op amps in a microphone circuit (converting from single rail from phantom power found in mixers/audio interfaces/etc.). I keep getting errors or LTspice just takes forever to no avail when I run simulation. The LTC3260 is configured to regulate down to +/- 10V. Can someone tell me what I'm doing wrong here? Also are there simpler or alternative solutions to providing a clean bipolar supply from a single rail? Thanks in advance for any pointers.

Tags: power management hardware DC-DC Converter Regulated Inverting Charge Pumps LTC3260 Inductorless (Charge Pump) DC/DC Converters 17.1.8 LDO Linear Regulators power bipolar supply charge pump Show More

0 Kapila
on Jun 19, 2023 7:42 PM
Or do you think a simple mid-supply virtual ground (resistor divider) is more than enough for the ADA4075 signal buffers? Am I overthinking this?
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0 MartyM

on Jun 26, 2023 1:50 PM in reply to Kapila
Hello,

I did not see the ADA4075 op-amp in LTSpice but I did notice that there are many other op-amps like the ADA4077. Can a similar op-close be to simulate the LTC3260 with the op-amp intended to use?
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0 Kapila
on Jun 26, 2023 2:01 PM in reply to MartyM
I downloaded the official spice model from Analog for the ADA4075 since it isn't natively included in LTspice library. Frankly I'm not sure why you don't natively support a lot of your chips in LTspice. Anyhow, the whole point was to model the system in its entirety. ADA4075 is significantly quieter (which is extremely desirable in this applicaition) than ADA4077 and the quiescent requirements differ a bit. Anyhow I could give your suggestion a shot.
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Unable to model LTC3260 in LTspice