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Charge Pump Electronic Circuits

Charge Pump:  #'s - B      C - F       G - R      S - Z
 

Last Updated: November 30, 2017 07:38 AM

Circuits Designed by Dave Johnson, P.E.

+5v Powered Charge Pump Battery Charger The circuit below will trickle charge a four cell pack of AA or AAA NiMH
batteries.  The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery.  This should be enough current to fully charge a pack of. . . Circuit by David Johnson P.E.-February, 2010

1 Watt Fluorescent Lamp Night Light If you are tired of replacing small night light lamps, try this circuit.  The line powered circuit uses a long life cold cathode fluorescent lamp.  A simple charge pump technique runs the lamp without any transformer. . . Circuit by David A. Johnson P.E.-March, 1999

125Khz LC Oscillator This circuit adds more invertors in parallel to deliver more power.  It is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR.  Please note that the values shown are for 125KHz.. . . Circuit by Dave Johnson P.E.-March, 2002

125KHZ Medium Power Ocsillator This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

125Khz Oscillator from CMOS Inverters This circuit inverts the LC components so the inductor is grounded.  Two inverters are needed to produce the needed oscillation.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David Johnson P.E.-March, 2002

125khz Oscillator with Medium Power This circuit adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

125Khz Ultra Pure Sine Wave Signal Source For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

12v Touch Switch Exciter Circuit This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.    It can support a cable length of about 2500 feet.    A typical remote switch circuit is also shown as well as a receiver circuit for those switches.. . . Circuit by Dave Johnson P.E.-February, 2002

20 LED Night Light -  After 3 years of continuous 24/7 operation I noticed that the 20 LED array I was using as a night light next to my back door was fading.  Some of the LEDs were much dimmer than others.  I figured that over time, the internal heat dissipated from the LED chip was causing the LED light intensity to fade.  I decided it was time to replace the light. . . . Circuit by David Johnson P.E.-July, 2017

200Mhz-400Mhz Voltage Controlled Oscillator (VCO) If you need a clean emitter coupled logic   (ECL) type signal between 200MHz and 400MHz this circuit works fine.  It uses four voltage-controlled capacitors to change the frequency. . . Circuit by Dave Johnson P.E.-March, 1999

24v NiMH
Battery Charger using a 12v Solar Panel 
A while back I received an email from a guy in the UK.  He wanted to use a small solar panel, designed to charge 12v lead acid batteries, but use it to charge a 24v battery pack.  His 24v battery pack used 20 AA size NiMH
cells.  He went on to explain that his 20 cell NiMH
battery pack was used very infrequently . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2011

300v Peak to Peak Signal Generator This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times. . . Circuit by David A. Johnson P.E.-June, 2000

Astable Multivibrator with Very Low Power This classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Audio Frequency Digital Noise Generator When you need to test an audio circuit with broadband noise, this circuit works great.  It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly.  I included a level control pot. . . Circuit by Dave Johnson P.E.-July, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

+5v Powered Charge Pump Battery Charger The circuit below will trickle charge a four cell pack of AA or AAA NiMH
batteries.  The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery.  This should be enough current to fully charge a pack of. . . Circuit by David Johnson P.E.-February, 2010

1 Watt Fluorescent Lamp Night Light If you are tired of replacing small night light lamps, try this circuit.  The line powered circuit uses a long life cold cathode fluorescent lamp.  A simple charge pump technique runs the lamp without any transformer. . . Circuit by David A. Johnson P.E.-March, 1999

100ma UltraLow Noise Charge Pump LED Supply with Output Current Adjust LTC3201___ Linear Technology/Analog Devices

C controls charge pump as background task  08/01/97 EDN-Design Ideas Because of power consumption and cost, designers of battery-powered devices mainly choose components that run at 3V or lower.  Unfortunately, many devices operate only at 5V, including LCDs with built-in drivers, programming lines of many EEPROMs and flash chips, and CMOS ADCs__ Circuit Design by Carlos Cossio, Santander, Spain

10 Khz VFC uses Charge Pump Variation 04/09/98 EDN-Design Ideas  (Several circuits included, scroll to find this one)  A diode-capacitor charge pump is the starting point for many voltage-to-frequency-converter  (VFC] designs.  The circuit in Figure 1 uses a variation on that classic theme to achieve linearity less than 0.05%, micropower operation of approximately 10-�A total draw from a 5 to 36V rail, and bipolar-input capability__ Circuit Design by Stephen Woodward, University of North Carolina, Chapel Hill, NC

125Khz LC Oscillator This circuit adds more invertors in parallel to deliver more power.  It is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR.  Please note that the values shown are for 125KHz.. . . Circuit by Dave Johnson P.E.-March, 2002

125KHZ Medium Power Ocsillator This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

125Khz Oscillator from CMOS Inverters This circuit inverts the LC components so the inductor is grounded.  Two inverters are needed to produce the needed oscillation.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David Johnson P.E.-March, 2002

125khz Oscillator with Medium Power This circuit adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

125Khz Ultra Pure Sine Wave Signal Source For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

12v Touch Switch Exciter Circuit This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.    It can support a cable length of about 2500 feet.    A typical remote switch circuit is also shown as well as a receiver circuit for those switches.. . . Circuit by Dave Johnson P.E.-February, 2002

20 LED Night Light -  After 3 years of continuous 24/7 operation I noticed that the 20 LED array I was using as a night light next to my back door was fading.  Some of the LEDs were much dimmer than others.  I figured that over time, the internal heat dissipated from the LED chip was causing the LED light intensity to fade.  I decided it was time to replace the light. . . . Circuit by David Johnson P.E.-July, 2017

200Mhz-400Mhz Voltage Controlled Oscillator (VCO) If you need a clean emitter coupled logic   (ECL) type signal between 200MHz and 400MHz this circuit works fine.  It uses four voltage-controlled capacitors to change the frequency. . . Circuit by Dave Johnson P.E.-March, 1999

24v NiMH
Battery Charger using a 12v Solar Panel 
A while back I received an email from a guy in the UK.  He wanted to use a small solar panel, designed to charge 12v lead acid batteries, but use it to charge a 24v battery pack.  His 24v battery pack used 20 AA size NiMH
cells.  He went on to explain that his 20 cell NiMH
battery pack was used very infrequently . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2011

28V Dual Tracking Bipolar Supply with Outputs from 5V to 25V The LTC3260 is a low noise dual polarity output power supply that includes an inverting charge pump with both positive and negative LDO regulators.  The charge pump operates over a wide 4.5V to 32V input range and can deliver up to 100mA of output current.  Each LDO regulator can provide up to 50mA of output current.  The negative LDO post regulator is powered from the charge pump output.  The LDO output voltages can be adjusted using external resistor dividers___ Linear Technology/Analog Devices App Note, Apr 19th 2012

300v Peak to Peak Signal Generator This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times. . . Circuit by David A. Johnson P.E.-June, 2000

5V power supply teams low-dropout regulator, charge pump 8-Jan-04 EDN-Design Ideas Auxiliary power of 3.3V is replacing the 5V auxiliary power that "silver boxes" supply in most computer systems, but some circuits still require a 5V supply.  Such systems impose the messy task of creating a central 5V auxiliary supply from the 3.3V auxiliary supply and then routing 5V power throughout the motherboard__ Circuit Design by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA

Astable Multivibrator with Very Low Power This classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Astable Multivibrators Multivibrators: an old, well known and boring subject.  Nonot at all: there are lots of different ways of looking a them and they are not at all what they may seem. __ Designed by Richard Torrens

Audio Frequency Digital Noise Generator When you need to test an audio circuit with broadband noise, this circuit works great.  It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly.  I included a level control pot. . . Circuit by Dave Johnson P.E.-July, 2000

Boost Converter Generates 3 Analog Rails App Note #2026 In Figure 1, a standard boost converter consisting of IC1, C1, L1, D1, and C2 generates, in addition tomain output, two auxiliary supply rails   (10V and -5V) withaddition of some small and very low-cost extra components___ Maxim Integrated

Boost converter generates three analog rails EDN-Design Ideas July 2, 1998        [ NOTE : File has multiple design, scroll for this one.]  The standard boost converter in Figure 1 uses not only IC1, C1, L1, D1, and C2 to generate a main 5V output, but also additional small, low-cost components to provide two auxiliary supply rails of 10 and -5V.  These auxiliary outputs are useful for analog circuitry in small handheld instruments, which often require supply voltages greater than the signal range.  Input voltages of 0.8 to 5.5V, which is equivalent to voltages from a battery pack of one to three cells, sustain the main regulated output of 5V2%.  With an input of 1.8V from two flat cells, for instance, and with the other rails unloaded, the circuit can produce 25 mA with 80 to 90% efficiency.__ Circuit Design by Tim Herklots, Maxim Integrated Products Ltd, Theale Berkshire, UK

Boost Converter Generates Three Analog Rails In Figure 1, a standard boost converter consisting of IC1, C1, L1, D1, and C2 generates, in addition to the main output, two auxiliary supply rails   (10V and -5V) with the addition of some small and very low-cost extra components.  Such rails are useful for the analog circuitry in small handheld instruments, which often require supply voltages in excess of the signal range. __ Maxim Integrated Products Ltd, APPLICATION NOTE 2026

Buck/Boost Charge Pump Regulator Powers White LEDs from a Wide 1.6 Volt to 5.5 Volt Input App Note #1021___ Maxim Integrated

Build a charge pump with ultralow quiescent current 5-Aug-04 EDN-Design Ideas Portable battery-powered devices often spend most of their life in standby mode, in which the quiescent current of an internal boost converter continuously bleeds the battery.  The quiescent current during standby can be larger than the actual load current.  Though several inductor-based converters offer maximum quiescent current of less than 10 A, designers usually prefer or require a regu__ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA

Charge Pump & Step Up DC DC Converter Solutions for Powering White LEDs in Series or Parallel Connections App Note #1037___ Maxim Integrated


Charge Pump:  #'s - B      C - F       G - R      S - Z


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