Author Topic: Go-to circuit to increase push/pull current on 4mA MCU outputs  (Read 500 times)

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Offline Psi

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Does anyone have a 'go to' circuit they have used to increase the output current on a 3.3V gpio while keeping it push/pull and rail to rail?

This is to drive a small diode+cap charge pump, so it does need push/pull and rail to rail.

A normal 20mA output has enough power to drive the charge pump directly however i'm now using an mcu with 4mA gpio.
So i need to buffer this back to 20mA.

BOM cost is an issue, so a couple of transistors would be better than an IC.

I'm having problems figuring out a circuit that works reliability without shoot through.
VCC range is 3.3V down to 2V as the device runs on a single cell.

Any ideas?
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Offline Psi

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Greek letter 'Psi' (not Pounds per Square Inch)
 
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Offline Bassman59

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