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Buck / Step Down Power Supplies
Buck:  #'s - A     B - K    L - Z

Boost,    Buck,    Buck-Boost,    Switchmode
Power Supplies -- Main Page           Converters -- Main Page

Last Updated: October 18, 2017 05:04 AM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

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

Boost Controller Drives Buck Converter-  02/03/97 EDN Design Ideas:  By adding an external Switching Transistor, you can use a step up DC/DC Converter to step down voltages to produce an efficient Battery Powered Power Supply, this example Circuit can step down inputs as Low as2V to Outputs as Low as1.25V, with efficiency as high as 80% __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Buck Converter (1 watt LED driver)-  This is an example of efficiently driving a 1 watt white LED from a 12 volt battery using a buck converter.  The LED could simply be connected with a series resistor to get the desired current, but the efficiency would be only 25% since the resistor would drop 9 volts while the LED only requires 3.  The buck converter provides about 90% efficiency. __ Designed by Bill Bowden

Buck converter charger also provides system power-  11/16/96 Literature Number: SNVA532Switching Regulator providescharge voltage setpoint with Current regulation, and second Switching Regulator provides 5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery isbest choice because of high capacity and relatively low cost.  The battery charges __ Designed by Application Note Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Buck Converter Handles Battery-Backup System-  04/24/03  EDN Design Ideas:  Circuit forms gamma-photon detector - 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.  This design idea shows how to use this bidirectional energy transfer to automatically recharge a battery when the mai __ Circuit Design by Haresh Patel, Linear Technology Corp, Milpitas, CA

Buck converter uses low side PWM IC-  19-Mar-09 EDN Design Ideas:  A voltage-level shifter lets you control voltages above a PWM controller's power source __ Circuit Design by L Haachitaba Mweene, PhD, National Semiconductor Corp, Richardson, TX

Buck converter works efficiently from phone line-  02/15/00 EDN Design Ideas:  A switching converter provide as an inexpensive way to generate 5V, 18 mA (48V, 5 mA maximum) directly from a standard phone line (Figure 1).  The high input voltage and low available current require a unique design approach to achieve high efficiency.  The circuit uses the LM2597HVM, which has a 60V rating and power-saving features. __ Circuit Design by Wayne Rewinkel, National Semiconductor, Santa Clara, CA

Buck Converter-AC Model-  We've already developed a SPICE model for the Buck Converter in a voltage control loop.  The controller performed brilliantly holding the output steady under varying load conditions.  However, closing the loop is fraught with danger! Without proper insight, Vo can start ringing and oscillating out of control (spice design) __

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.  With incandescent bulbs, the power management for the device is a simple on-off switch __ Circuit Design by Robert Kollman, Texas Instruments, Dallas, TX

Buck or Boost: Rugged Fast 60V Synchronous Controller Does Both-  DN370 Design Notes__ Linear Technology/Analog Devices

Buck Regulator & Two Inductors Make Dual-Polarity Converter-  20-Mar-03 EDN Design Ideas:  A common problem for power-supply designers is to create a compact, dual-polarity step-down converter.  If space and cost are not concerns, the obvious solution is a pair of DC/DC converters, one for each output.  But space and cost are almost always issues for communications, data-acquisition, and disk-drive applications __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Buck regulator forms high-power, inverting –5V supply-  04/01/04  EDN Design Ideas:  Configuring a step-down switching-converter IC as an inverter yields an efficient, high-power, -5V supply that can of deliver currents as high as 4.5A at the 12V input or 3.2A at the 5V input (Figure 1).  Conventional inverting power __ Circuit Design by Bruce Denmark, Maxim Integrated Products, Sunnyvale, CA

Buck regulator generates flexible VTT for PECL-  08/15/97 EDN Design Ideas:  Circuit to generate Output which can both Source and Sink Current -The positive emitter-coupled logic (PECL]in most high-speed clock-distribution and -recovery circuits requires a termination voltage, VTT, that imposes special requirements on  VTT supply.  First,  typical switching thresholds for PECL must refer to VDD __ Circuit Design by Bruce D Moore, Maxim Integrated Products, Sunnyvale, CA

Buck regulator handles light loads-  09/09/10 EDN Design Ideas:  If your design uses too small a boost capacitor, it will not operate reliably. __ Circuit Design by Justin Larson and Frank Kolanko, On Semiconductor, East Greenwich, RI

Buck Regulator Operates Without a Dedicated Clock-  08/21/03 EDN Design Ideas:  Most switching regulators rely on a dedicated clock oscillator to determine the switching frequency of operation.  A dedicated oscillator circuit within the power controller usually generates the clock signal.  A class of hysteretic switching regulators can actually operate at a relatively fixed frequency without a clock, even with changing input-line and output-loading conditions __ Circuit Design by Robert Bell, National Semiconductor, Phoenix, AZ

Buck Regulator Terminates Fast Data Buses-  07/20/95 EDN Design Ideas:  The limitations of 5 and 3.3V CMOS buses are spurring the development of high-speed, low-voltage buses for the next generation of computers.  These buses, such as Futurebus and Rambus, require low-voltage supply rails to reduce signal-voltage swings.  Other buses, such as CTT (center-terminated transceiver) and HSTL (high-speed transceiver logic) , have center termination and, therefore, require a power source that can sink current as well as source it __ Circuit Design by Bruce Moore, Maxim Integrated Products, Sunnyvale, CA

Buck Regulator Uses Step-Up Controller-  11/09/95 EDN Design Ideas:  The circuit in Fig 1uses a step-up (boost) DC/DC controller in a negative buck-regulator application.  The circuit’s function is to power the laser diode in an optical amplifier/booster unit, a job for which no commercial IC is available.  The anode of the laser diode connects to ground, so the supply voltage must be negative and must deliver 160 to 750 mA.  Although the boost-regulator IC operates in a buck-regulator circuit, its standard connections permit proper control of Q1.  However, you need an op amp __ Circuit Design by Massimo De Marco, Maxim Integrated Products Cusano Milanino, Italy

Buck-Boost Controller Drives High-Power LEDs, Charges High-Voltage Batteries-  08/29/13  EDN-Design Notes The LT®3791 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant-current and constant-voltage at up to 98.5% efficiency with a single inductor.  It can deliver hundreds of watts and features a 60V input and output rating, making it ideal for driving high power LED strings and charging high voltage batteries when both step-up and step-down conversion is needed.  It can also be used as a constant voltage buck-boost regulator with current limiting and monitoring for both input and output. __ Designed by Keith Szolusha, Linear Technology Corporation, also see Linear Technology Design Note 501

Buck-Boost Regulator Suits Battery Operation-  09/04/03  EDN Design Ideas:  A buck/boost converter can step a voltage up or down.  Such a converter is appropriate for battery-powered applications.  One application derives a regulated 14.1V at 1A from 12V solar panels with 9 to 18V variation.  In this type of b __ Circuit Design by Kahou Wong, On Semiconductor, Phoenix, AZ

Buck-converter charger also provides system power-  05/22/97 EDN Design Ideas:  Switching Regulator provide as  charge voltage setpoint with Current regulation, and second Switching Regulator provide as5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery is  best choice because of high capacity and relatively low cost.  The battery charges __ Designed by Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Capacitor improves efficiency in CPU supply-  04/04/02 EDN Design Ideas:  High efficiency is important for the DC/DC buck converters that supply high currents in notebook PCs.  This efficiency extends battery life and minimizes temperature rise.  A low-dissipation synchronous rectifier using an external MOSET provide as this high efficiency.  Synchronous rectifiers require special attention, however __ Circuit Design by Masami Muranaka, Maxim Integrated Products, Tokyo, Japan

Cheap PWM IC makes synchronous gate driver-  02/04/99 EDN Design Ideas:    NOTE:    Page includes several designs.  Scroll to find this one.  A system with a µP, memory, and peripherals usually requires several power-supply voltages.  Designers typically use local switching regulators to produce the desired voltage rails.  One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to some other, lower voltage.  This approach has gained vast acceptance, thanks to its relative simplicity __ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Configure buck converter for boost operation-  12/17/98 EDN Design Ideas:  (File contains many circuits.  Scroll to find this one.) __ Circuit Design by Mehrzad Koohian, Semtech Corp, Newbury Park, CA

Controller IC & one-shot form resonant controller-  11/28/02 EDN Design Ideas:  Resonant power supplies are popular because of high efficiency, low noise, and compactness.  You can implement a resonant buck or boost converter using a single switch.  The regulation of the output in such a converter derives from using a constant on or off time and a variable frequency.  The UC1864 controller IC (Texas Instruments, www __ Circuit Design by C Rajan, Centre for Advanced Technology, Indore, India

Design Notes 504: 42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current-  11/26/13  EDN-Design Notes Measure inductance & capacitance over a wide range.  The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications.  To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation.  The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output. __ Circuit Design by Hua  Walker Bai

Detect Live AC-Mains Lines-  11/04/10 EDN Design Ideas:  Detect magnetic fields on a wire and light an LED __ Circuit Design by Raju R Baddi, Raman Research Institute, Bangalore, India

Double Data Rate Power Supply using the Tl5002 Voltage Tracking Regulator-  The TL5002EVM-180 synchronous buck converter provides a 12A reference design for evaluating the performance of the TL5002 PWM control IC and the TPS2837 MOSFET driver for Double Data Rate (DDR) memory applications. __

Dual High-Current Power Supply Kit-  The National Semiconductor Power Supply Kit is designed around the National LM2636, a synchronous buck regulator.  It provides over 28 amps of current with variable output voltages ranging from +1.3V to +3.3 V. __

Dual Monolithic Buck Regulator Provides Two 1.4A Outputs with 2-Phase Switching to Reduce EMI-  DN305 Design Notes__ Linear Technology/Analog Devices

Dual-phase buck controller drives high Density 1.2V/60A supply with sub-milliohm DCR sensing-  EDN Design Ideas:  07/31/2015  Low output voltages and use of DrMOS integrated FETs+drivers are hallmarks of this switcher design __ Circuit Design by LTC Design Note

EP48 12 V 1.44 W Non-Isolated Buck Converter-  This design kit is a non-isolated 12 V, 120 mA power supply utilizing a LNK304.  This power supply is intended as a general purpose evaluation platform for LinkSwitch-TN in a buck converter configuration. __

Extend the input range of a low-dropout regulator-  10/17/02  EDN Design Ideas:  Because of process limitations, all ICs have an input-voltage limitation.  This limitation can be cumbersome when you try to step down a high supply voltage to a lower, regulated voltage using a DC/DC converter, such as a linear re __ Circuit Design by Jeff Falin, Texas Instruments, Dallas, TX

Get buck-boost performance from a boost regulator-  07/11/02 EDN Design Ideas:  The SEPIC (single-ended, primary-inductance-converter] topology is generally a good choice for voltage regulators that must produce an on output voltage that falls in the middle of the input-voltage range, such as a 5V output from a 2.7 to 6V input, The topology has some disadvantages, however.  The efficiency of a SEPIC circuit fares worse than that of buck and boost regulators, and SEPIC desig __ Circuit Design by Tom Gross, Linear Technology Corp, Milpitas, CA

High Current Step-Down Controller Regulates to 0.6V Output from 3V Input-  DN322 Design Notes__ Linear Technology/Analog Devices

High Efficiency Monolithic Buck Converter [LTC1265]-  DN105 Design Notes__ Linear Technology/Analog Devices

High Efficiency Wide Input (Cold Crank) Range Dual 5V/8.5V Converter-  The LTC3859 is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages.  Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 850kHz.  The LTC3859 operates from a wide 4.5V to 38V input supply range.  When biased from the output of the boost converter or another auxiliary supply, the LTC3859 can operate from an input supply as low as 2.5V after start-up as shown in this circuit, ideal for automotive "cold crank" applications that require a wide input voltage range. __ Linear Technology/Analog Devices App Note, Jul 20th 2010

High Efficiency, UltraLow IQ, 42V, 2.5A Sync Buck Regulator-  The LT®8610 step-down regulator integrates key high performance features in one compact IC.  It offers synchronous rectification, for efficiencies up to 96%.  The low quiescent current of 2.5µA extends battery life and saves extra circuitry.  High speed switching minimizes board space and helps avoid EMI problems.  A low dropout __ Linear Technology/Analog Devices App Note, Leonard Shtargot Staff Engineer-Power Products Jun 14th 2012

High Power Synchronous Buck Converter Delivers Up to 50A-  DN156 Design Notes__ Linear Technology/Analog Devices

High Voltage Buck Regualtors provide High Current Low Profile Power Solutions for FireWire Peripherals-  DN287 Design Notes__ Linear Technology/Analog Devices

High Voltage Current Mode Step-Down Converter with Low Power Standby Capability-  DN383 Design Notes __ Linear Technology/Analog Devices

High Voltage Low Noise Buck Switching Regulator [LT1777]-  DN212 Design Notes__ Linear Technology/Analog Devices

IRDCiP1202-A 300kHz Dual 15A 5.5VIN to 13.2VIN Dual Output Synchronous Buck Converter using iP1202-  This board allows engineers to easily evaluate the iP1202 in an independent and parallel configuration that is capable of providing up to 15A per phase with double-sided heat sinking. __

IRDCiP2001-A 500kHz 40A 2-phase Synchronous Buck Converter using iP2001-  This board enables engineers to easily evaluate the iP2001 in a 2-phase configuration that is capable of providing up to 40A in a lab environment without airflow. __

Isolated Converters Have Buck Simplicity & Performance-  DN377 Design Notes__ Linear Technology/Analog Devices

Buck:  #'s - A     B - K    L - Z


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