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Scheme provides high-side current-sensing for white-LED drivers-  19-Feb-04 EDN Design Ideas:  White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players.  Multiple LEDs often connect in series to ensure that the same current flows through every LED.  To forward-bias these LEDs, a voltage of 10 to 16V comes from an inductor-based boost regulator, such as an SP6690 __ Circuit Design by Dimitry Goder, Sipex Corp, San Jose, CA

SEPIC generates 5V at 100 mA-  05/03/01 EDN Design Ideas:  Some applications require an input voltage higher than the breakdown voltage of the IC supply pin.  In boost converters and SEP ICs (single-ended primary-inductance converters], you can separate the VIN pin of the IC from the input inductor and use a simple Zener regulator to __ Circuit Design by Dongyan Zhou

Short-Circuit Beeper-  Schematic Only__

Short-Circuit Protection for Boost Regulators-  DN154 Design Notes__ Linear Technology/Analog Devices

Simple Circuit boost converter generates -27 & -87V-  05/22/97 EDN Design Ideas:  In modern telecommunications applications, the basic communications link to the home is becoming either digital or wireless.  The normal circuitry to control a telephone is moving from the central office to the home.  Subscriber-li __ Circuit Design by David Feller, Harris Semiconductor, Dallas, TX

Simple Circuit converts 5V to –10V-  26-May-05 EDN Design Ideas:  Switched-capacitor circuit doubles, inverts dc source __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Simple Circuit step-up converter (6V to 12V)-  This step-up converter is intended for use in a '67 Citroen 2CV.  This car, and I use the word loosely, has a 6V battery and won't support a modern radio that needs 12V.  The circuit described here converts 6V to 12V at 1A sustained load current. __ Designed by Oscar den Uijl, odu @ xs4all.nl

Simple Circuit Variable Boost Control for Cars with Turbochargers-  Quite a few cars have turbochargers these days and these can provide even more performance if the turbo boost pressure is increased.  However, you don't want permanently increased turbo boost as it increases wear on the engine, so you need a variable boost control, as presented here.__ SiliconChip

Simple Circuit voltage booster based on Linear Technologies LT1372, includes PCB Design-  Uses a LT1372 and only a Few partsBut can handle 1.5 amps Input Current.  Input as low as 3 VoltsOutput may be as high as 35 Volts __ Designed by G.L. Chemelec

Simple Relay Step-Up Circuits-  Have you ever needed to power a 12-volt relay in a circuit but only had 6 or 9 volts available? This simple circuit will solve that problem.  It allows 12-volt relays to be operated from 6 or 9 volts, or 24-volt relays from 12 volts.  While most normal relays require the manufacturer-specified coil voltage to__

Sine-wave step-up converter uses Class E concept-  02/17/05 EDN Design Ideas:  Many power applications ranging from luminescent and fluorescent lighting to telephone-ringing voltage generators require aor less sinusoidal-drive voltage.  These applications typically require a waveform of only moderate quality, and its frequency isn't especially critical.  However, avoiding waveform discontinuities that cause unwanted current peaks, excessive device dissipation, and EMC __ Circuit Design by Louis Vlemincq, Belgacom, Evere, Belgium

Single FET Controls 2nd LED Array in Switchmode LED Backlight-  APP1871: Feb03, 2003 A design in which the display is backlit (or frontlit) for extended periods needs an efficient circuit that drives the LEDs with a controlled current, and eliminates the wasted power associated with current-limiting resistors.  A switch-mode boost design that regulates current instead of voltage accomplishes this purpose. __ Maxim Integrated

Single Supercap Charger from 3.3V Input to 2.5V Output-  The LTC3125 is a high efficiency, synchronous step-up DC/DC converter with an accurate programmable ±5% accurate average input current is resistor programmable and suitable for a wide variety of applications__ Linear Technology/Analog Devices App Note, Mar 24th 2010

Single Transistor Provides Short-Circuit Protection-  16-Oct-03 EDN Design Ideas:  In certain DC/DC-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit.  A nonsynchronous boost converter provide as a direct path from the input to the short circuit through the inductor and the catch diode.  Regardless of current-limit protection in the IC, when a short circuit exists in the load, extremely high cu __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Stacked Supercap Charger from 2.5V to 5V Input to 4.5V Output-  The LTC3125 is a high efficiency, synchronous step-up DC/DC converter with an accurate programmable ±5% accurate average input current is resistor programmable and suitable for a wide variety of applications__ Linear Technology/Analog Devices App Note, Mar 24th 2010

Stacked Supercapacitor Charger from 1.8V to 5.5V Input to 5V Output (1000mA Max Input Current) -  The LTC3127 is a wide VIN range, highly efficient, 1.35MHz fixed frequency buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage.  The LTC3127 features programmable average input current limit, making it ideal for power-limited input sources.  The input current limit is programmed with a single resistor and is accurate from 0.  2A to 1A of average input current. __ Linear Technology/Analog Devices App Note, Mar 24, 2010

Step Up/Step Down Converter Takes 2 to 16V Inputs-  07/16/98 EDN Design Ideas:  (Several circuits in this file.  Scroll to find this one) The circuit in Figure 1 is a low-cost step-up/step-down dc/dc converter.  By definition, its input can range above and below the regulated voltage.  The circuit includes a simple switchmode boost converter (IC1) that contains a comparator normally used to detect low battery voltage. __ Circuit Design by Lucian Brodogna and  Luca Vasalli/ Maximin Integrated Products, Milan Italy

Step-Down Conversion Concept for a PWM-Mode Boost Converter-  TI App Note __

Stepdown Converter Uses a Ceramic Output Capacitor-  12/31/69 EDN Design Ideas:  Many stepdown (buck) dc/dc-converter ICs incorporate a voltage-mode-control algorithm.  As a result, for stable operation in continuous-conduction mode, the application circuit's output capacitor is normally a high-ESR tantalum type for two reasons.  The portion of output ripple due to ESR provide as the current-mode signal that's necessary for cycle-to-cycle stability.  In the frequency domain, this capacitor also provide as a zero that cancels a pole in the buck converter's second-order LC filter, thereby shifting operation back to the stable region by reducing the ripple's phase shift to less than 90°. __ Circuit Design by Karl R Volk, Maxim Integrated Products, Sunnyvale, CA

Step-Up Supply Charges Battery While Serving Load-  06/08/95 EDN Design Ideas:  The circuit in Fig 1 supports portable applications in which a microprocessor controls battery charging.  Step-up switching regulator IC1 boosts VIN (5V]to supply a combination of charging and load current. (Note that the 5V source __ Circuit Design by Dana Davis, Maxim Integrated Products, Sunnyvale, CA

Supercapacitor boosts current from small battery-  09/02/04  EDN Design Ideas:  Some battery-powered devices require large amounts of current in a short period of time but spend most of the time in sleep (power-down] mode.  The momentary large-load current demands large batteries to meet the time requirement, eve __ Circuit Design by Yongping Xia, Navcom Technology, Torrance, CA

Supply Derives 5 & 3.3V from USB port-  20-Dec-01 EDN Design Ideas:  The circuit in Figure 1 derives its power from a USB port and produces 5 and 3.3V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs.  The circuit allows the port to maintain communications while, for example, charging a lithium-ion battery.  IC2 boosts the battery voltage, VBATT, to 5V, and IC3 buck-regulates that 5V output down to 3 __ Circuit Design by Chad Olson, Maxim Integrated Products, Sunnyvale, CA

Synchronous PolyPhase Boost Converter for Cool & Powerful Applications-  Boost power conversion is important function in many industrial, automotive and commercial applications.  Higher power level customers have to deal with issues of high ripple currents, high power dissipation and higher EMI levels.  Linear Technology’s LTC3788 breaks new ground in boost converter technology, achieving the__ Linear Technology/Analog Devices App Note, Goran Perica-Applications Engineering Section Leader Jun 11th 2010

Tapped inductor, boost regulator Deliver high voltage-  07/20/06  EDN Design Ideas:  Obtain 100V dc from a 3V source __ Circuit Design by David Ng and Adam Huff, Linear Technology Corp, Milpitas, CA

Three parts provide tenfold increase in switcher current-  08/22/02 EDN Design Ideas:  Industrial-control circuits often derive their power from widely varying sources that can exceed the 40V maximum rating of popular switching ICs.  This design idea presents a simple, flexible, and inexpensive buck switcher that converts an input voltage as high as 60V to 5V at several amps.  The circuit is unique in that it boosts current with almost no compromise in performance, size, or cost __ Circuit Design by Wayne Rewinkel, National Semiconductor, Sunnyvale, CA

Three-Band Equalizer-  Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high.  With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.  Supply voltage may be anything from 6 to 30 Volts.  Maximum boost 20dB is only realized with maximum supply voltage __ Designed by Andy Collison

Three-Input Supply Powers 3.3V Portable-  04/13/95 EDN Design Ideas:  The single-ended primary-inductance converter in Fig 1 accepts input voltages ranging from 3 to more than 6V and produces a regulated 3.3 V, 200-mA output.  The converter accepts an input voltage from three sources a 5V dc wall cu __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Tiny & Efficient Boost Converter Generates 5V at 3A from 3.3V Bus-  DN280 Design Notes__ Linear Technology/Analog Devices

Tiny Highly Flexible Dual Boost/Inverter Tracks Supplies-  DN357 Design Notes__ Linear Technology/Analog Devices

Tiny Microcontroller Hosts Dual DC/DC-Boost Converters-  05/15/08  EDN Design Ideas:  An Atmel AVR microcontroller can serve as the PWM controller for two DC/DC converters that provide high voltages from a two-cell supply __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

TPS6102x Boost Converter Down Conversion Mode-  TI App Note __

TPS61042 White Light LED Driver Boost Converter Rev. A-  TI App Note __

Transistor Boosted Relay-  This relay driver boosts the input impedance with a regular 2N3904 transistor (or equivalent).  Very common driver.  It can drive a variety of relays, including a reed-relay, and is non-latching. 
Transistor Q1 is a simple common-emitter amplifier that increases the effective sensitivity of the 12 volt relay coil about a 100 times. __ Designed by Tony van Roon  VA3AVR

Triple Output Power Supply (5V, 15V,-10V) for LCD Displays-  From 2.7V to 4.2V, the LT1944-1 generates 3 supplies (5V AT 40mA, 15V AT 2.5mA, -10V AT 1mA) required to bias a small LCD display__ Linear Technology/Analog Devices App Note, Mar 24th 2010

Two Farad, 5V SuperCap charger from a 3.3V input-  The LTC3459 controls peak inductor current when VIN is greater than or less than VOUT.  This allows current to be controlled during start-up in a boost application or VOUT to be regulated below VIN when powered from a fresh battery.  Peak current control makes the LTC3459 an ideal candidate for charging a back-up source such__ Linear Technology/Analog Devices App Note, Mar 23, 2010

UCC3819 250-W Pfc Boost follower Preregulator Design-  This is an App Note that describes a reference design.  This paper reviews the benefits of a boost follower topology and the design of a 250-W PFC boost follower preregulator. __

Unique IC Buffer Enhances Op Amp Designs Tames Fast Amplifiers-  AN16 Linear Technology This note describes some of the unique IC design techniques incorporated into a fast, monolithic power buffer, the LT1010.  Also, some application ideas are described such as capacitive load driving, boosting fast op amp output current and power supply circuits. __ Linear Technology/Analog Devices

Universal PSU-  A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps. __ Designed by Volker Jeschkeit

Universal PWM Driver-  PWM drivers are used in analysing, testing, installing and powering all kinds of electronic and electrical devices.  We have published a few designs in Elektor over the years: here we present a ‘de luxe’ version.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Use a Boost Regulator Beyond Its Rated Voltage-  01/05/12  EDN Design Ideas:  Use an external FET in a common-gate cascode configuration.  Inexpensive boost regulators with on-chip FET power switches work well for low-voltage boost converters, SEPICs (single-ended primary-inductance converters) , and flyback converters.  For higher voltages, designers typically use a more expensive approach comprising a controller with an external FET or a high-voltage boost regulator. __ Circuit Design by Kevin Tompsett, Analog Devices, Fort Collins, CO

Use a microcontroller to Design a boost converter-  4-Mar-04 EDN Design Ideas:  Boost converters, like other switchers, have traditionally received their control signals from a dedicated circuit.  However, a recent trend is to integrate simple switching-power-supply building blocks into generic devices, such as microcontrollers.  An excellent example of this concept is a microcontroller that combines digital and analog circuitry and makes it easier to build simple power supp __ Circuit Design by Ross Fosler, Microchip Technology, Chandler, AZ

Using an AVR-  Tiny13V microcontroller as step up (boost) or step down (buck) voltage converter for driving a white or high power LED. (pdf file) LED headlamp projects. __ Designed by Steven "Melt Solder" Weber  KD1JV

VFD (Vacuum Fluorescent Display) & Filament Power Supply-  The LT3581 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltages, and overtemperature conditions.  The part consists of a 42V master switch, and a 42V slave switch that can be tied together for a total current limit of 3.3 A. __ Linear Technology/Analog Devices App Note, Jan 16th 2012

Voltage Booster (Very Simple)-  Uses a LT1372 and only a Few parts - But can handle 1.5 amps Input Current.  Input as low as 3 Volts - Output may be as high as 35 Volts __ Designed by G.L. Chemelec

Wide Input Range, 3.3V SEPIC Converter Can Operate from 3V to 36V (Cold Crank)-  While requiring 6V to start up, the addition of a diode tied from output to input allows this circuit to operate as the battery sags all the way down to 3V.  This wide input voltage range is required for automotive cold crank applications.  The LT3581 is a PWM DC/DC converter with built-in fault protection features to aid__ Linear Technology/Analog Devices App Note, Jul 27th 2010


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