Getting half value in the output of charge pump

[rajbuddy]

Hello guys,

I have made a charge pump circuit to the microcontroller where I am giving 3.3V to charge pump but I am getting 1.6V at the output which is insufficient to start the uC. Where am I getting wrong? Kindly check.

Br,
Raj

[MathWizard]

https://www.analog.com/media/en/technical-documentation/data-sheets/3240fb.pdf

What voltage do u need ? It says

With input voltages greater than the regulated output voltage the LTC3240 operates as a low dropout regulator. Once the input voltage drops within 100mV of the regulated output voltage the part automatically switches to step-up mode. In step-up mode the LTC3240 operates as a constant frequency (1.2MHz) doubling charge pump.

I never tried any charge pump circuits. How noisy are they compared to using inductor based switching sources ?

[rajbuddy]

Hi,

i need 3.3V to be exact to start my microcontroller but it is giving half like 1.6 somewhere