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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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LDO Buck/Boost 2 Sync Buck Sync Boost Reference Design-  LDO, Buck/Boost, 2 Sync.  Buck, Sync.  Boost with Vin 2.7-4.2 V LiION or 4.5-6.5 V adapter.  Multiple output voltages of 1.5 V, 2.5 V, 3.3  V and 8 V.  The total output power is 5.5 W. __

Low EMI Synchronous DC/DC Step-Down Controllers offer Programmable Output Tracking-  DN382 Design Notes__ Linear Technology/Analog Devices

Lower DC/DC converter ripple by using optimum capacitor hookup-  31-Oct-02 EDN Design Ideas:  Low-ripple-voltage positive-to-negative DC/DC converters find use in many of today's high- frequency and noise-sensitive disk drives, battery-powered devices, portable computers, and automotive applications.  Like a positive buck converter, a positive-to-negative converter can have low output-ripple voltage if you place the bulk input capacitor between VIN and VOUT rather than between VIN and gr __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

LT1074/LT1076 Design Manual-  AN44 Linear Technology This note discusses the use of the LT107) 4 and LT107) 6 high efficiency switching regulators.  These regulators are specifically designed for ease of use.  This App Note is intended to eliminate the most common errors that customers make when using switching regulators__ Linear Technology/Analog Devices

LT1339 Design Manual-  AN73 Linear Technology This App Note contains detailed design information to allow the reader to craft switching regulators using the LT1339 high power synchronous DC/DC converter.  The note provides expanded pin descriptions for the LT1339 as well as easy-to-use graphical tools__ Linear Technology/Analog Devices

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

LT3791 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. __ Circuit Design by Keith Szolusha

LT8705 80V VIN / VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller-Video Product Brief-  The LT®8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage.  The part has integrated input current, input voltage, output current and output voltage feedback loops.  With a wide 2.8V to 80V input and 1.3V to 80V output range, the__ Linear Technology/Analog Devices App Note, Bruce Haug-Senior Product Marketing Engineer Jun 11th 2013

LTC Design Note 512: 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 __ Circuit Design by Charlie Zhao

LTC Design Note: 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 __ Circuit Design

LTC Design Note: 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. __ Circuit Design

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 __ Circuit Design

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 __ Circuit Design

LTC Design Note: 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

LTC1265: a New High Efficiency Monolithic Buck Converter-  DN105 Design Notes__ Linear Technology/Analog Devices

Make your own LED Headlamp-  I have submitted here my process for constructing an LED headlamp.  I originally attempted to fit the battery holders for 3 AAA cells along with a tiny PC board for the three LEDs and current limiting resistor all in a tiny altoids tin.  No go.  I ended up buying a 3 cell holder with switch from Mouser electronics, gluing an elbow/ball joint pivot from a desktop pen set I had pieces from to that battery holder, then bolting the pivot to a Walgreens tiny mint tin (the sugar free ones come in a small oval shaped tin).  The LEDs __ Designed by John Evans

Monolithic Step-Down Regulator Withstands the Rigors of Automotive Environments & Consumes Only 100µA of Quiescent Current-  DN378 Design Notes __ Linear Technology/Analog Devices

Monolithic Synchronous Step-Down Regulators Pack 600mA Current Rating in a ThinSOT Package-  DN300 Design Notes__ Linear Technology/Analog Devices

No Design Switching Regulator 5V 5A Buck Step Down Regulator-  DN48 Design Notes__ Linear Technology/Analog Devices

No Design Switiching Regulator 5V Buck/Boost Positive to Negative Regulator-  DN49 Design Notes__ Linear Technology/Analog Devices

Notebook Power Supply Has Two Output-  03/03/94 EDN Design Ideas:  The notebook-computer supply in Fig 1 powers the 5V logic and derives an adjustable -24V supply for an LCD's backplane.  The design uses only a high-efficiency buck regulator (Si9150]and an NMOS/PMOS, dual-power-FET chip set (Si9943] __ Circuit Design by Steven C Hageman, Calex Manufacturing Co Inc, Concord, CA

Obtain a lower DC voltage from a higher voltage power supply-  06/08/06 EDN Design Ideas:  Linear stepdown regulator saves watts __ Circuit Design by Luca Bruno

Off-Line Buck Regulator Cuts Costs, Lead-Time-  10/26/95 EDN Design Ideas:  The low-cost, frequency-modulating buck regulator in Fig 1 uses an inexpensive CMOS ICM7555 timer and a low-cost, low-power rail-to-rail op amp.  Because of the low power of these parts, the circuit can achieve efficiencies of more than 90%.  Although you can combine many controllers with a high-side switch to achieve the same function, this circuit is cheap.  Also, you can quickly build it from easily available parts. __ Circuit Design by Peter McAnn, Trek Inc, Medina, NY

Piezoelectric Energy Harvester & 1.2V Secondary Rail-  The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation.  The EN pin can be used to activate the LTC3388-1/LTC3388-3.  For instance, in this circuit the __ Linear Technology/Analog Devices App Note, Jul 23, 2010

Positive regulator makes negative DC/DC converter-  12/26/02 EDN Design Ideas:  Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost DC/DC converters.  Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs that have positive-reference feedback voltages far outnumber these negative-feedback regulators __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

PWM IC makes synchronous gate driver-  02/02/99 EDN-Design Ideas (contains 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. __ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Solar Step Down Regulator-  This is an experimental circuit which rapidly "chops" a steady DC input voltage to produce a lower output voltage. Regulation is a function of the chopping - It is caused by the output transistor switching on and off around the target voltage, which when smoothed provides a constant DC output. __ Designed by Rowan from Melbourne, Australia

Solar-Powered 2.2V Supply & 1.8V LDO with Li Battery Backup & Run Threshold Set to Battery Minimum Voltage-  The LTC3104 is a high efficiency, monolithic synchronous step-down converter using a current mode architecture capable of supplying 300mA of output current.  The LTC3104 includes an integrated, adjustable 10mA LDO to power noise sensitive functions.  Additionally, the LTC3104 includes an accurate RUN comparator, thermal overload__ Linear Technology/Analog Devices App Note, Dec 5th 2011

Solar-Powered 2.2V Supply with Li Battery Backup & Run Threshold Set to Battery Minimum Voltage-  The LTC3103 is a high efficiency, monolithic synchronous step-down converter using a current mode architecture capable of supplying 300mA of output current.  Additionally, the LTC3103 includes an accurate RUN comparator, thermal overload protection, a power good output and an integrated soft-start feature to guarantee that the__ Linear Technology/Analog Devices App Note, Dec 5th 2011

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

Synchronous Buck Produces Negative Voltage-  6-Mar-03 EDN Design Ideas:  Many electronic systems require both positive and negative voltages to operate properly.  Generating an efficient, low-voltage positive output from a higher voltage input typically entails the use of a synchronous buck regulator.  But when generating a negative output voltage from a positive input voltage, you'd typically use a flyback topology, especially at higher output currents __ Circuit Design by John Betten, Texas Instruments, Dallas, TX

Synchronous flyback provides high-efficiency conversion-  07/22/04 EDN Design Ideas:  Buck regulators are usually the first choice when you design nonisolated step-down regulators unless the ratio of VIN to VOUT is greater than 10, the input voltage is high, or both.  Low duty cycle can be problematic for FET drivers and cause current-mode control loops to lose control.  Efficiency can fall dramatically to 60 to 70% at low VOUT and current of only a few amps __ Circuit Design by Wayne Rewinkel, National Semiconductor, Phoenix, AZ

ThinSOT Micropower Buck Regulator has Low Output Ripple-  DN373 Design Notes__ Linear Technology/Analog Devices

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-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. __ Circuit Design by Nora Jacalan Esteves, Technor Semiconductor LLC, Pleasanton, CA

Tiny Buck Regulator Accepts Inputs from 3.6V to 25V & Eliminates Heat Sink-  DN268 Design Notes__ Linear Technology/Analog Devices

Tiny Step-Up/Step-Down Power Supply Delivers 3.3V at 1.3A in Battery-Powered Devices-  DN271 Design Notes__ Linear Technology/Analog Devices

Tiny Versatile Buck Regulators Operate from 3.6V to 36V Input-  DN367 Design Notes__ Linear Technology/Analog Devices

Two 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. __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Ultralow-EMI, 96W, Step-Down μModule Regulator— EN55022 Class B Certified in a 15mm x 15mm Footprint-  The LTM4613 delivers high output power and efficiency with demonstrated EMI performance that complies with EN55022 Class B.  With carefully designed integrated filter, meticulous internal layout, shielded inductor, internal snubber circuitry and power transistor driver, the LTM4613 achieves a perfect __ Linear Technology/Analog Devices App Note, Jan 30, 2012

USB-GSM application with 5V USB input (500mA max) charging a 4.4mF super cap (3.4V 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

Virtual-Zener Simplifies High-Voltage Interface-  03/20/03  EDN Design Ideas:  Buck regulator and two inductors make dual-polarity converter - This design for a photonic switch needsthan approximately 70V at the cathode of a duo-lateral optical position-sensing device.  This voltage gets speedy response at lo __ Circuit Design by Philip Lane, Transparent Networks Inc, Bellevue, WA

Wide VIN Range Step-Down Regulators Consume Only 2.8μA Input Current-  Battery life is paramount in modern battery-powered systems.  portable applications, such as remote sensors, require voltage regulators which have low current standby states and also able to provide bursts of high power.  Linear Technology’s LT®3970/LT3971 lead the industry in low current standby mode by consuming only __ Linear Technology/Analog Devices App Note, John Gardner-Design Engineer Power Products May 23, 2011

Wide-range regulator Delivers 12V, 3A output from 16 to 100V source-  06/23/05  EDN Design Ideas:  Buck regulator tackles high input voltages __ Circuit Design by Wayne Rewinkel, National Semiconductor, Schaumburg, IL

Buck:  #'s - A     B - K    L - Z


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