Voltage Converter Circuits
+9 Volt*and* 9 Volt From One Battery!: The MAX1044 is a charge pump converter - it uses a capacitor as a "bucket" to pump charge from one place to another. It can be used to generate negative voltage easily.
0.02% Volt / F Converter Consumes only 26 µA: 07/04/96 EDN-Design Ideas
10 kHz VFC uses Charge Pump Variation: 04/09/98 EDN-Design Ideas
12 Volt DC to 120 Volt AC Inverter: this inverter should solve that problem. It takes12 VDC and steps it up to120 VAC. The-Wattage depends on which transistors you use for Q1 and Q2, as well as how "big" a transformer you use for T1. The inverter can be constructed to supply anywhere from1 to1000 (1 KW)-Watts.
12 Volt to 9 Volt DC Converter: Car Converter for12 Volt to 9V
2 Watt Switching Power Supply: from 6V to14V
3.3 Volt Supply Taps Power From the12 Volt PCI Bus
5 Volt DC From RS232 Signals: The circuit of Figure1 produces a semi-regulated5-Volt output from an RS-232 port. Unlike a PC-mouse supply or comparable that rely on the modem-control signals DTR and RTS, this one operates with a3-wire port GND, Rx, and TX, and obtains power only from the TX line. The output current-about 8mA-is sufficient for CMOS microcontrollers and other low-power.
6 to 12 Volt Converter: This circuit can provide up to 800mA of12V power from a 6 Volt supply. The circuit is simple, about 75% efficient and quite useful.
Boost Converter Generates Three Analog Rails: Maxim Application Note #2026
Buck Converter Chargers Also Provides System Power: 05/22/97 EDN Design Ideas / Switching Regulator provides the charge voltage setpoint with Current regulation, and second Switching Regulator provides5V System Power
Buck converter handles battery backup system: 04/24/03 EDN-Design Ideas / A synchronous buck converter is inherently bidirectional. That is, it transfers energy from input to output as a buck regulator when the output voltage is low, but, when the output voltage is high, the converter acts as a boost regulator, transferring power from output to input.
Buck IC boosts battery voltage for white LED: 04/24/03 EDN-Design Ideas / White-light LEDs are finding their way into many markets that incandescent bulbs once served. Flashlights are among the newer applications in which reliability, ruggedness, and ability to control the power draw of the LEDs make these devices attractive.
Buck/Boost Charge Pump Regulator Powers White LEDs From a Wide 1.6 Volt to 5.5 Volt Input: Maxim Application Note #1021
C Volt Ranger: transforms a0-5-Volt input voltage to a adjustable range between0-10-Volt
Charge Pump and Step Up DC DC Converter Solutions for Powering White LEDs in Series or Parallel Connections: Maxim Application Note #1037
Charge Pump Circuit Divides By Two: 02/18/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
Charge Pump Converts Volt in to± Volt OuT: 09/02/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
Charge Pump Doubles Negative Voltage: Maxim Application Note #782
Choosing the Right Power Supply IC for your Application: Maxim Application Note #737
Cigarette Lighter 9 Volt Adapter
Circuit forms single pulse voltage multiplier: 09/18/03 EDN-Design Ideas / It is sometimes necessary for a microcontroller to generate a pulse whose voltage is higher than the power-supply voltage of the microcontroller. The circuit in Figure 1 allows you to generate 14V pulses from a 5V power supply.
Circuit performs high speed voltage to current, current to current conversion: 07/25/2002 EDN - Design Ideas / The circuit in Figure 1performs active voltage-to-current conversion or acts as a variable-gain current mirror with high precision and bandwidth. A typical application is testing high-speed ICs or other devices that have inputs designed to be driven from current-steering DACs to enable a modulated voltage source to control the devices.
Compact, Inductorless Boost Circuit Regulates White LED Bias Current: Maxim Application Note #1116
Controlling a Variable Voltage Power Supply Using the DS1809 (Pushbutton Control): Maxim Application Note #1035
CoolSET TDA16831: 34 for OFF-Line Switch Mode Power Supplies
DAC Powered Charge Pump Varies Negative Rail: Maxim Application Note #203
DC to DC Converter Allows of Single Battery: Have you ever wanted to circuit to run off a single 9 Volt battery only to find you needed levels like +12 and -12 Volts? The thought of multiple batteries might have put you off. Why not use a simple DC to DC converter?
DC to DC Converter operates From Phone Line: 11/09/00 EDN Design Ideas / PDF contains multiple circuits - scroll to find this circuit
DC to DC Converter: will produce a 85-Volt voltage from +3V, usable for low power applications
DC/DC Conversion Without Inductors: Maxim Application Note #725
Design Case Study: Designing a Power Supply for a Portable, Wireless Contact Manager : Maxim Application Note #1014
Design Formulas Simplify Classic V/I Converter: 01/20/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.
Doubler/Inverter Charge Pumps Divide By Two: Maxim Application Note #1876
DPP adds versatility to VFC: 11/14/2002 EDN - Design Ideas / The basic VFC (voltage-to-frequency converter) in Figure 1 comprises an integrator (IC1) and a Schmitt-trigger circuit (IC2). The integrator converts the dc input voltage, VIN , to a linear voltage ramp, and the Schmitt trigger sets the limits of the integrator's output voltage. Feedback around both circuits provides the condition for oscillation.
Driving LEDs in Battery Operated Applications: Controlling Brightness Power Efficiently: Maxim Application Note #1804
Easy Xenon DC to DC Converters
High Power Voltage Regulator Has Low Dropout Voltage: Maxim Application Note #52
Inductorless Switching Regulator Boosts Input Voltage: Maxim Application Note #5
Inductorless Voltage Converter Boosts a Single Lithium Cell: Maxim Application Note #1791
Linear Voltage to Frequency Converter
Low Battery Monitor Delays System Shutdown: Maxim Application Note #134
Low Side CurrentSensing Circuit Uses Synchronous VToF Converter: 09/02/02 Electronic Design - Ideas for Design / A voltage-to-frequency converter (VFC) can easily measure current flow and convert it to a digital signal understood by the timer/counter input of a microcomputer (µC) or microprocessor.
Lower Operating Frequency Improves ICL7660 Voltage Conversion Efficiency: Maxim Application Note #10
Miniature, Precision Negative Reference Requires No Precision Resistors: Maxim Application Note #824
Negative Voltage Generator: takes in +12V and outputs around -11V
One 9 Volt Battery gives +18, +25, +33V: This circuit is based on MAX1044 is a charge pump converter.
PIC Controlled DDS VFO, 0 to 6 MHz
Regulated Charge Pump Delivers 50mA: Maxim Application Note #35
Regulated Step Up Converter Provides High Efficiency Without Inductors: Maxim Application Note #44
Simple Circuit Provides +5 Volt Gate Bias From 48 Volt Input: Maxim Application Note #1803
Simple Methods Reduce Input Ripple for All Charge Pumps: Maxim Application Note #2027
Supplying Power Via the 1 Wire Bus: Maxim Application Note #949
Switch Mode DC Supply: The switching power supply, shown in the schematic, provides12 volts, at10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. The supply was constructed in1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today.
Switched capacitor IC and reference form elegant –48 to +10V converter: 04/24/03 EDN-Design Ideas / A system designer must almost always face a trade-off in choosing the right part for an application. The trade-off usually involves performance, price, and function. An example is the issue of powering circuits from a telecom-voltage source. Telecom systems almost exclusively use high-potential negative rails, such as 48V.
Tiny Charge Pump Provides Highly Reliable Low Cost Solution to Negative Reference Voltage: Maxim Application Note #348
Trading Performance for Cost in Portable Power Supplies: Maxim Application Note #269
Triple Capacitive Voltage Inverter With the MAX871: Maxim Application Note #1875
Tripler Converts 5 Volt to 15V: Maxim Application Note #297
Two Watt Switching Power Supply: from 6V to14V
Universal High Resistance Voltmeter
Universal Watchdog Fully Controls µ Preset: 05/25/95 EDN-Design Ideas
Use a 555 timer as a switch mode power supply: 11/14/2002 EDN - Design Ideas / Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation. The design uses two 555s
VCO has Digitally Programmable Center Frequency: 04/25/96 EDN-Design Ideas
VCO Transforms Sound Card Into Precision DC Coupled ADC : 08/19/02 Electronic Design - Ideas for Design / Personal-computer sound cards are sometimes used for analog audio signal acquisition. Also, the Web features many free programs that implement virtual two-channel oscilloscopes by acquiring signals through the sound card.
VCO uses programmable logic: 11/14/2002 EDN - Design Ideas / A VCO (voltage-controlled oscillator) is an analog circuit, so you cannot find it in the libraries for the design of digital programmable chips. When you need such a circuit for synchronization or clock multiplication, you need to find a circuit that works with the standard digital functions, such as AND and NAND.
Versatile Monolithic Volt / Fs Can Compute As Well As Convert With High Accuracy: National Semiconductor Application Notes,04-Nov-1995
Volt / F Converter Draws Flea Power: 04/24/97 EDN-Design Ideas
Voltage Controls Sine Wave Frequency: 08/17/95 EDN-Design Ideas
Voltage Inverter #1: simple low power design based on555
Voltage Inverter IC Forms High Efficiency Rail Splitter: Maxim Application Note #218
Voltage to current converter drives white LEDs: 06/27/2002 EDN - Design Ideas / You sometimes need to drive a white LED from one 1.5V battery. Unfortunately, the forward voltage of a white LED is 3 to 4V. So, you would need a dc/dc converter to drive the LED from one battery. Using the simple circuit in Figure 1, you can drive one white LED or two series-connected green LEDs, using only a few components.
Voltage to current converter makes a flexible current reference : 09/18/03 EDN-Design Ideas / The voltage-to-current converter in Figure 1 can both source and sink current. The circuit is more flexible than some traditional current references that require different topologies for current sourcing and sinking. Also, you can easily adjust the value of the current reference by simply adjusting the circuit's input voltage.
Voltage To Current Converter Works From Single Supply Rail: 02/17/03 Electronic Design - Ideas for Design / Voltage-to-current converters feeding to grounded loads often find their way into industrial measurements and control applications. The conventional textbook circuit needs both positive and negative-supply rails.