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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.

Charge Pump Battery Charger-+5 Volts 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 . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

Charge Pump Efficiently Divides Supply Voltage  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by David A. Johnson P.E.-July, 2000

CMOS Inverter 125khz LC Oscillator This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values. . . Circuit by Dave Johnson P.E.-March, 2002

CMOS Inverter forms a Resonant LD Oscillator  This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002

CMOS Inverters Form 125Khz Oscillator 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 . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

CMOS Nand Gate Forms Gated 125Khz Oscillator This circuit is uses a NAND gate as an inverter.  The gate allows the oscillator to be gated on and off.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David A. Johnson P.E.-March, 2002

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 . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Exciter Circuit-12v Touch Switch This circuit generates a 20KHz pseudo sine wave signal that can power approximately 50 remote touch activated switch circuits.  This hobby circuit can support a cable length of approximately 2500 feet.  A typical remote switch circuit is also shown as . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

FETs & Logic Devices Divides Supply Voltage on Charge Pump Efficiently  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Flexible Outputs from Square Wave Driver This circuit can produce an output signal ranging from DC to 100KHz.  It can source a voltage ranging from 1v to 30v.  It can sink a voltage ranging from zero volts to –30v.  It can drive up to 200ma of current and can even be switched to a floating tristate . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2000

Fluorescent Lamp Night Light Needs Only 1 Watt 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 . . . Hobby Circuit designed by David Johnson P.E.-March, 1999

Fully Isolated 50/60hz Sync Generator This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2004


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

 

Charge Pump 12V to ±5V Supply The LTC3260 can supply up to 100mA from the inverted input voltage at its charge pump output, VOUT.  VOUT also serves as the input supply to a negative LDO regulator, LDO–.  The charge pump frequency can be adjusted between 50kHz to 500kHz by a single external resistor.  The MODE pin is used to select between a high efficiency___ Linear Technology/Analog Devices App Note, Jan 4th 2013

Charge Pump Battery Charger-+5 Volts 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 . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

Charge pump converts –5V to 5V 01/20/05  EDN-Design Ideas Versatile switched-capacitor charge-pump voltage converters can provide a negative supply voltage from a positive-voltage source or double a positive source's voltage.  However, certain applications that consist entirely of ECL (emit__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Charge pump converts V IN to ±V OUT 02-Sep-99 EDN-Design Ideas A charge-pump IC's ability to produce both VIN  and -VIN outputs allows the circuit in Figure 1 to generate separate positive and negative outputs from a single input voltage, regardless of the input-voltage polarity.  For example, the circuit allows an RS-232C interface__ Circuit Design by Ioan Ciasci, Rei Data, Cluj-Napoca, Romania

Charge Pump Doubles Negative Voltage App Note #782___ Maxim Integrated

 

Charge Pump Efficiently Divides Supply Voltage  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by David A. Johnson P.E.-July, 2000

Charge Pump Generates Positive Bias 03/02/95 EDN-Design Ideas Placing the averaging filter inductor in the output return leg of an isolated forward-converter power supply can significantly reduce the common-mode noise the supply generates.  This technique can eliminate some of the high-frequency spikes present on the output voltage__ Circuit Design by Steve Mowry, Siemens Industrial Automation, Johnson City, TN

Charge pump with ultraLow quiescent current 08/05/04  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__ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA

Charge pump-logic voltages of 3-5 volts. A charge pump uses arrays of capacitors to increase voltage in a circuit.  In this way, you can drive higher voltage loads from logic voltages of 35 volts. __ Designed by Bruce Robinson

Charge-pump divides by two 02/18/99 EDN-Design Ideas NOTE :  Collection of Design Ideas, scroll to find this one.   Small size and efficiency approaching 100% make switched-capacitor charge pumps popular for voltage doubling and inverting in miniature dc-dc applications.  Few are aware, however, that most charge pumps can halve as well as double or invert an input voltage.  The increasing adoption of low-voltage logic makes this ÷2 capability useful for generating low-voltage supplies in portable equipment.__ Circuit Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA

Charge-pump topology doubles voltage, breaks DC path EDN-Design Ideas 08/09/2016    This unusual charge-pump voltage multiplier Design Ideasnot only doubles the input, but has a pseudo-floating output__ Circuit Design by Michael Dunn

Choosing the Right Power Supply IC for Your Application App Note #737___ Maxim Integrated

Circuit Provides +5 Volt Gate Bias from  48 Volt Input App Note #1803___ Maxim Integrated

Circuit provides 5V gate bias from –48V 09/19/02 EDN-Design Ideas A small and simple circuit derives 5V from the -48V rail that telecomm applications typically use (Figure 1).  Useful for gate bias and other purposes, the 5V supply delivers as much as 5-mA output current.  A shunt reference__ Circuit Design by William Hadden

CMOS Inverter 125khz LC Oscillator This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values. . . Circuit by Dave Johnson P.E.-March, 2002

CMOS Inverter forms a Resonant LD Oscillator  This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002

CMOS Inverters Form 125Khz Oscillator 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 . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

CMOS Nand Gate Forms Gated 125Khz Oscillator This circuit is uses a NAND gate as an inverter.  The gate allows the oscillator to be gated on and off.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David A. Johnson P.E.-March, 2002

Compact Inductorless Boost Regulates White LED Bias Current App Note #1116___ Maxim Integrated

Controlling a Variable Voltage Power Supply using the DS1809 Pushbutton Control App Note #1035___ Maxim Integrated

Converter Generates 3.3V from Two or Three Cell 11/21/96  EDN-Design Ideas Generating 3.3V from two or three cells poses a design challenge.  The regulator must step down the voltage when the cells are fresh but step up the voltage when the cells are semidischarged and weak.  One solution to this problem is a flyback-transformer__ Circuit Design by Robert Badalian, Maxim Integrated Products, Sunnyvale, CA

DAC Powered Charge Pump Varies Negative Rail App Note #203___ Maxim Integrated

DC/DC Conversion Without Inductors App Note #725___ Maxim Integrated

Design Case Study: Designing a Power Supply for a Portable Wireless Contact Manager App Note #1014___ Maxim Integrated

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 . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Doubler/Inverter Charge Pumps Divide by Two App Note #1876___ Maxim Integrated

Driving LEDs in Battery Operated Applications: Controlling Brightness Power Efficiently App Note #1804___ Maxim Integrated

Exciter Circuit-12v Touch Switch This circuit generates a 20KHz pseudo sine wave signal that can power approximately 50 remote touch activated switch circuits.  This hobby circuit can support a cable length of approximately 2500 feet.  A typical remote switch circuit is also shown as . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

FETs & Logic Devices Divides Supply Voltage on Charge Pump Efficiently  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Flexible Outputs from Square Wave Driver This circuit can produce an output signal ranging from DC to 100KHz.  It can source a voltage ranging from 1v to 30v.  It can sink a voltage ranging from zero volts to –30v.  It can drive up to 200ma of current and can even be switched to a floating tristate . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2000

Fluorescent Lamp Night Light Needs Only 1 Watt 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 . . . Hobby Circuit designed by David Johnson P.E.-March, 1999

Fully Isolated 50/60hz Sync Generator This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2004


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


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