269 Dickson Charge Pump

269 : Dickson Charge Pump

Design render
  • Author: Uri Shaked
  • Description: Pumps the input voltage up to ~3.65V
  • GitHub repository
  • Clock: 2000000 Hz

How it works

A 3-stage dickson charge pump. The output voltage is Vout = 4*(VPWR - Vd) = ~3.6 V where VPWR is the digital input voltage (1.8 V), and Vd is the diode drop (~0.9 V). The output voltage is divided by two and available at the ua[0] pin.

How to test

Apply a clock signal of 2 MHz to the clk input. In TT07, the analog pin voltage is limited to VDDIO/VDDA (usually 3.3 V), so the output voltage will be divided by two. You can measure the divided output voltage at the ua[0] (vout_div) pin.

Simulation results

Post layout simulation showing the output voltage x1.vout and the divided output voltage on ta ua[0] pin. The output voltage stabilizes at ~3.65 V, and the divided output voltage at ~1.82 V. The current draw is about 623.5 nA (measured by adding a 1k resistor between ua[0] and VGND in simulation).

output voltage and divided voltage

The following graph shows the input clock, the intermediate voltages at the output of each stage, the output voltage, and the divided voltage as they rise during the first 10 us of operation.

output voltage and intermediate voltages

Project layout

Project layout

IO

#InputOutputBidirectional
0
1
2
3
4
5
6
7

Analog pins

uaanalogDescription
08vout_div

Chip location

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