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Charge Pump Electronic Circuits

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

Last Updated: November 21, 2017 05:44 AM

Circuits Designed by Dave Johnson, P.E.

Square Wave Driver Has Flexible Outputs 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. . . Circuit by Dave Johnson P.E.-July, 2000

Touch Switch Exciter If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Ultra Pure 125kHz 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%. . . Circuit by David A. Johnson P.E.-February, 2002

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

Very Low Power Gated Crystal Oscillator The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed.  The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed. . . Circuit by David Johnson P.E.-June, 2000

Voltage Boost to Series Regulator provided by Capacitor -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply . . . Hobby Circuit designed by Dave Johnson P.E.-January, 1998


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

Simple Circuit Methods Reduce Input Ripple for All Charge Pumps App Note #2027___ Maxim Integrated

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

Simple 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

Solar Charge Controller PIC Project  The previous version of this device used pulse width modulation (PWM) to control the power from the five solar panels to charge the battery bank.  Under full sun conditions the MOSFETS got a bit warm and the whole unit radiated a lot of RFI.  This design uses a set of relays, one for each panel.  If the controller decides the battery voltage is too low, it engages another relay;.) __ Designed by Luhan Monat-Mesa Arizona

Square Wave Driver Has Flexible Outputs 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. . . Circuit by Dave Johnson P.E.-July, 2000

Supplying Power via the1 Wire Bus App Note #949___ Maxim Integrated

Ten 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

Ten-Cent Charge Pump Provides LCD Bias Designing a product for low-power battery operation usually means maximizing the battery life by operating the circuit on as low of a supply voltage as possible.  This design used a custom LCD but, due to the number of display segments (160) , a __

Tiny Charge Pump Provides Highly Reliable Low Cost Solution to Negative Reference Voltage App Note #348___ Maxim Integrated

Touch Switch Exciter If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Trading Performance for Cost in Portable Power Supplies App Note #269___ Maxim Integrated

Triple Capacitive Voltage Inverter with the Max871 App Note #1875___ Maxim Integrated

Tripler converts 5 to 15V 08/17/00 EDN-Design Ideas  By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V(Figure 1).  A 15V rail is useful for powering op amps, LCD-bias circuits and other low-current applications.  The connections shown configure the IC1 voltage doubler as a tripler.  The no-load output voltage of the circuit is approximately 3VIN–2VD,__ Circuit Design by Ken Yang, Maxim Integrated Products, Sunnyvale, CA

Tripler Converts 5 Volt to 15V App Note #297 By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1).  A 15V rail is useful for powering op amps, LCD-bias circuits, and other low-current applications.  The connections shown configure the IC1 voltage doubler as a tripler.  The no-load output___ Maxim Integrated

Ultra Pure 125kHz 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%. . . Circuit by David A. Johnson P.E.-February, 2002

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

Very Low Power Gated Crystal Oscillator The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed.  The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed. . . Circuit by David Johnson P.E.-June, 2000

Voltage Boost to Series Regulator provided by Capacitor -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply . . . Hobby Circuit designed by Dave Johnson P.E.-January, 1998

Voltage Inverter IC Forms High Efficiency Rail Splitter App Note #218___ Maxim Integrated

Voltage Inverter II This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input.  It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery.  The circuit will operate at an input voltage from around 5V to 20V and produce a output from +-2.5V to +-10V. __ Contact: IQ Technologies


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


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