Author Topic: MAX865 charge pump, hard to get working  (Read 380 times)

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Offline ahopeTopic starter

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MAX865 charge pump, hard to get working
« on: July 27, 2020, 05:16:58 am »
Hi,
I am working on a board where I need +/- supplies to a couple of op-amps.
I am trying to use the MAX865 dual-output charge pump. It will nicely double the 3.3V supply and provide positive and negative supplies of double the input, i.e. +/- 6.6v.

I can make it work - some of the time. It will successfully run on some board, while on other boards it will not work properly and outputs +2.7 and -1.4 while being fed with 3.3v.

Everything else on these boards runs fine, STM32L4´s, digital pots, input mux, all I2C devices etc.

Does anyone have experience with the MAX865 and can share some advice on how to make it work reliably?
I have attached a snapshot from the relevant area of my board.

PDP10 6502 6809 68000 PDP11 8088 x86 ND5000 STM32 ESP32
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