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

Boost,    Buck,    Buck-Boost,    Switchmode
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Last Updated: November 22, 2021 03:00 PM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-778-8407

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

10µA Quiescent Current Step-Down Regulators Extend Standby Time in Handheld Products-  DN235 Design Notes__ Linear Technology/Analog Devices

10A μModule step-down regulator with advanced input & load protection-  EDN Design Ideas:  07/01/2015  This switcher design has comprehensive electrical and thermal protection, and high efficiency over wide input-output ranges Design by LTC Design Note

12Vin to 5V AT 25A using Very Low DCR Current Sense-  The LTC3866 is especially well suited to low voltage, high current supplies because of a unique architecture that enhances the signal-to-noise ratio of the current sense circuit.  This allows it to operate with the small sense signals produced by very low DCR, 1mΩ or less, inductors, which are used to improve power efficiency in high current supplies.  The improved SNR minimizes jitter due to the switching noise, which could corrupt the signal.  The LTC3866 can sense a DCR value as low as 0.2mΩ with careful PCB layout__ Linear Technology/Analog Devices App Note, Mar 29th 2012

160 Volt, 3 Ampere DC Motor power supply-  A very compact, efficient and simple off-line buck regulator. __ Designed by Manfred Mornhinweg

2 AA cells power step-down regulator-  01/07/99 EDN Design Ideas:  (Scroll to find this one) DC/DC conversion is particularly challenging when both the input and output voltages are low.  Step-up ICs that operate with inputs lower than 1V are available, but step-down ICs that accept input voltages      Page includes several designs. Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

20-36Vin to 12VoutAT16A 2-Phase Low Noise EN55022B Compliant uModule Power Supply-  The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply.  Included in the package are the switching controller, power FETs, inductor and all support components.  Operating over an input voltage range of 5V to 36V, the LTM4613 supports an output voltage range of 3.3 V to 15V, set by a single external resistor.  Only bulk input and output capacitors are needed to finish the design__ Linear Technology/Analog Devices App Note, Apr 25th 2011

3 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 Design by Wayne Rewinkel, National Semiconductor, Sunnyvale, CA

3.3V converter Delivers 3W from Li-Ion battery-  11/05/98 EDN-Design Ideas (Several circuits here, scroll to find this one) Lithium-ion batteries are rapidly gaining popularity in portable applications because of their superior energy density, low self-discharge rate, and high cell voltage.  When you use one Li-ion battery to power a 3.3V DC/DC converter; however, you encounter a problem, because the battery voltage. Design by David Salerno, Unitrode Corp, Merrimack, NH

3.3V to 5.5V input (500mA max) charging 4.4mF super cap (3.3V at 800mA) & providing 1.8V at 400mA-  The LTC3619 is a Dual 400mA/800mA monolithic synchronous buck regulator with an input supply voltage range is 2.5V to 5.5V, making it ideal for Li-Ion and USB powered applications __ Linear Technology/Analog Devices App Note, Mar 23, 2010

3.3V/10mA Regulator from a 4mA to 20mA Loop-  This circuit is a 3.3 V/10mA regulator that extracts its power from a 4mA to 20mA loop.  This circuit demonstrates how an LTC1474/LTC1475-based regulator is easily optimized for such low current applications.  The 2W sense resistor limits the peak inductor current to 40mA to minimize current ripple and provide good efficiency __ Linear Technology/Analog Devices App Note, Mar 16th 2011

3A 2MHz Monolithic Synchronous Step-Down Regulator Provides a Compact Solution for DDR Memory Termination-  DN309 Design Notes__ Linear Technology/Analog Devices

3-Channel White-LED Driver Uses Simple Circuit Step-Down DC/DC Converter-  09/13/12  EDN Design Ideas:  Drive multiple LEDs with current mirrors from a single step-down converter. Design by Nora Jacalan Esteves, Technor Semiconductor LLC, Pleasanton, CA

4.3V to 42Vin 3.3V AT 5A Step-Down Converter-  The LT3976 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V.  Low quiescent current design consumes only 3.3 μA of supply current while regulating with no load.  Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output__ Linear Technology/Analog Devices App Note, Sep 12th 2012

4.5V to 14Vin, 3.3V AT 25A Vout Switches at 2MHz-  A 2MHz, 3.3 V/25A step-down converter.  The LTC3838/LTC3839 can operate at switching frequencies above the AM radio band (fSW > 1.8MHz).  The high switching frequency permits the use of inductors of very small footprint, so that the entire circuit can fit within a 0.9in2 area with both sides populated.  The peak efficiency is 95%, and full load efficiency well above 90% at 25A, even at a frequency of 2MHz. __ Linear Technology/Analog Devices App Note, Mar 29th 2012

4.5V to 38Vin, 1.2/15A, 1.5V/15A Dual Output, 350MHz Step-Down Converter-  4.5V to 38V input, 1.2/15A, 1.5V/15A dual output, 350MHz step-down converter.  With the output sensed directly through a resistor divider network, the remote sensing scheme in Channel 1 mimics the traditional feedback used in Channel 2.  This novel remote sensing scheme eliminates the diff amp output pin required in other parts__ Linear Technology/Analog Devices App Note, Mar 29th 2012

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. Design by Hua  Walker Bai

48V to 10.8V at 10A Buck Converter Charger for 3-Series LiFePO4 Battery Pack-  Building a complete charging system with the LTC4000 and a DC/DC converter is nearly as easy as using a dedicated charger IC.  Figure 5 shows the LTC4000 controlling an LT3845A buck converter in a charger designed for a 3S LiFePO4 battery pack (3S refers to three cells in a series configuration).  The LT3845A buck converter is chosen here for its simplicity and high, 60V input voltage capability. __ Linear Technology/Analog Devices App Note, Mar 29th 2012

4MHz Monolithic Synchronous Step-Down Regulators Bring High Efficiency to Space-Sensitive Applications-  DN304 Design Notes__ Linear Technology/Analog Devices

55V High efficiency buck-boost power manager & multi-chemistry battery charger-  EDN Design Ideas:  01/01/2016  A versatile, efficient, multi-chemistry battery charger design operates in buck & boost modes. Design by LTC Design Note

60V High Efficiency Buck Switching Regulators in SO-8-  DN202 Design Notes__ Linear Technology/Analog Devices

60V/3A Step-Down DC/DC Converter Maintains High Efficiency over a Wide Input Range-  DN301 Design Notes__ Linear Technology/Analog Devices

6-12Vin to ±5V AT 50mA Split Supply-  An easy-to-implement split-voltage power supply using the LTC3388 yields a low quiescent current, high efficiency solution for powering low current analog circuits that need a virtual ground output.  The output voltage of each device is digitally programmable to four output voltages from 1.2V to 5.0V and will support a load __ Linear Technology/Analog Devices App Note, Jan 30th 2012

65V 500mA step-down converter fits automotive & industrial applications-  05/31/14  EDN Design Ideas:  This switcher is happy to drop a 60V input all the way down to 0.8V.  The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout.  The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages.  As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages Design by LTC Design Note

6A Monolithic synchronous DC/DC step-down converter with digital power system management-  EDN Design Ideas:  01/02/2017  Efficient 6A buck sports PMBus configuration and monitoring Design by LTC Design Note

80V synchronous 4-switch buck-boost controller Delivers hundreds of watts with 99% efficiency-  EDN Design Ideas:  12/26/2014   An 80V synchronous 4-switch buck-boost controller that can provide hundreds of watts at up to 99% efficiency with a single inductor.  Four servo loops Design by LTC Design Note

9-24Vin to 1.8VoutAT1A Low EMI uModule Power Supply-  The LTM8031 is an electromagnetic compatible (EMC) 36V, 1A DC/DC μModule® buck converter designed to meet the radiated emissions requirements of EN55022.  Conducted emission requirements can be met by adding standard filter components.  Included in the package are the switching controller, power switches, inductor, filters and all support components.  Operating over an input voltage range of 3.6V to 36V, the LTM8031 supports an output voltage range of 0.8V to 10V, and a switching frequency range of 200kHz to 2.4MHz, each set by a single resistor.  Only the bulk input and output filter capacitors are needed to finish the design.  The low profile package (2.82mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation. __ Linear Technology/Analog Devices App Note, Apr 22, 2011

A High Efficiency 500kHz 4.5A Step-Down Converter in an SO-8 Package-  DN181 Design Notes__ Linear Technology/Analog Devices

Add a signal-strength display to an FM receiver IC-  09/05/02  EDN Design Ideas:  The Philips (www.  semiconductors.  philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacito Design by José Miguel-López, RF Center Ltd, Barcelona, Spain

Add an auxiliary voltage to a buck regulator-  31-Oct-02 EDN Design Ideas:  You often need than one regulated output voltage in a system.  A frequently used and reasonably simple way to create this auxiliary output voltage is to add a second winding to the output inductor, creating a coupled inductor or a transformer, followed by a diode to rectify (peak-detect] this output voltage Design by John Betten, Texas Instruments, Dallas, TX

ArroW Lighting-TI DC/DC LED Driver Solution-  In this article, 2 lighting applications of TI TPS40211 will be presented.  TI TPS40211 is a DC/DC LED driver controller which accepts DC voltage up to 52V and is able to fit various kinds of LED lighting application including MR16 as well as streetlamp application. __ Designed by James Ho, Arrow Asia Pac

Automotive 9V-19.5Vin to 5V at 1A with 60V Transient Protection & 1.7MHz Switching Frequency-  The LT3682 is a 1A monolithic buck switching regulator that accepts input voltages from 3.6V to 36V and transients up to 60V.  It features an adjustable and synchronizable switching frequency from 250kHz to 2.2MHz.  It also has the ability to monitor the current flowing through the external catch diode, thus providing an extra level of protection against output fault conditions over the entire operating frequency range, regardless of input voltage__ Linear Technology/Analog Devices App Note, Jul 22, 2010

Buck:  #'s - A     B - K    L - Z

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