Micropower Buck/Boost Circuits Part 1: Converting Three Cells to 3.3V*: DN109 - Design Notes (Linear Technology) (app note added 1/06)
Micropower Buck/Boost Circuits Part 2: Converting Four Cells to 5V*: DN110 - Design Notes (Linear Technology) (app note added 2/06)
No Design Switiching Regulator 5V Buck/Boost (Positive to Negative) Regulator: DN49 - Design Notes (Linear Technology) (app note added 1/06)
Positive to Negative Buck/Boost Converter using LM267X SIMPLE SWITCHER® Regulators: National Semiconductor Application Note 27 Mar2000 (app note added 7/02)
Single Inductor Tiny Buck/Boost Converter Provides 95% Efficiency in Lithium-Ion to 3.3V Applications: DN275 - Design Notes (Linear Technology) (app note added 1/06)
Step Up/Step Down Current Source Charges Batteries: 06/06/96 EDN Design Ideas / (added 11/05) For battery charging, the highly efficient step-down (buck) configuration is usually the topology of choice. However, a different approach is necessary if the following conditions prevail: The supply voltage is less than the battery voltage, or, even worse, the supply voltage ranges above and below the battery voltage.
Step-Down Converter Operates from Single Li-ION Cell: DN196 - Design Notes (Linear Technology) (app note added 1/06)
Synchronous Buck Reference Design #2: This reference design is synchronous Buck/Boost converter that can deliver up to 3.8 A of continuous current at -5 V from a 5 V input. This topology uses a synchronous buck controller (TPS5103) referenced to the negative output rail. The synchronous MOSFETs allow this design to achieve a peak efficiency of 88%. In addition, the TPS5103 provides a soft-start function and over-current protection. (added 3/05)
Synchronous Buck/Boost High Power White LED Driver: Linear Technology LT3453 (app note added 2/05)
Up/Down Sequence of Supplies Using the ADM1060: AN-667 - Analog Devices Application Note (app note added 6/06)
3.3V converter delivers 3W from Li-ION battery : 11/05/98 EDN-Design Ideas / (added 11/05) 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 can be higher or lower than 3.3V. When fully charged, a Li-ion cell has approximately 4.2V output; when fully discharged, the voltage is approximately 2.5V. Therefore, you cannot use a simple buck or boost topology with a single inductor to generate a regulated 3.3V output. Some designs boost the voltage to approximately 4.3V and then use a low-dropout regulator to produce the 3.3V. This approach is inefficient, and efficiency is a crucial consideration in battery-powered applications. The circuit in Figure 1 offers a solution to the problem....
4MHz Monolithic Synchronous Step-Down Regulators Bring High Efficiency to Space-Sensitive Applications: DN304 - Design Notes (Linear Technology) (app note added 6/06)
60V High Efficiency Buck Switching Regulators in SO-8: DN202 - Design Notes (Linear Technology) (app note added 1/06)
60V/3A Step-Down DC/DC Converter Maintains High Efficiency over a Wide Input Range: DN301 - Design Notes (Linear Technology) (app note added 1/06)
Add an auxiliary Voltage to a Buck regulator: 10/31/02 EDN Design Ideas / (added 1/05) You often need more 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....
AN-1146: Designing a Multi-Phase Asynchronous Buck Regulator using the LM2639: National Semiconductor Application Note 27 Mar2000 (app note added 7/02)
AN-1197: Selecting Inductors for Buck Converters: National Semiconductor - Application Note (app note added 7/06)
AN-1253: Wide-Input, High Voltage Buck Converter: National Semiconductor - Application Note (app note added 2/06)
AN-1319: Analysis and Design of a Hysteretic Constant Frequency Buck Regulator using the LM5007: National Semiconductor - Application Note (app note added 7/06)
AN-6003 / 'Shoot-through' in Synchronous Buck Converters: Fairchild Application Notes / (app note added 6/06)
AN-6005 / Synchronous buck MOSFET loss calculations with Excel model: Fairchild Application Notes / (app note added 6/06)
AN793: Power Management in Portable Applications: Understanding the Buck Switchmode Power Converter: Microchip Application Note - Published 18-Jul-01 (app note added 2/06)
AN874: Buck Configuration High-Power LED Driver: Microchip Application Note - Published 4-Jan-06 (app note added 6/06)
AN968: Simple Sychronous Buck Regulator: MCP1612: Microchip Application Note - Published 14-Jan-05 (app note added 2/06)
Analysis and Design of a Hysteretic Constant Frequency Buck Regulator using the LM5007: National Semiconductor - Application Note (app note added 7/06)
AN-H48: Buck-Based LED Drivers using the HV9910: Supertex Semiconductors (app note added 6/06)
Boost Controller Drives Buck Converter: 02/03/97 EDN Design Ideas / (added 3/05) -- 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%
Buck Boost Regulator Suits Battery Operation: 09/04/03 EDN Design Ideas / (added 1/05) 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 battery application, efficiency is an important factor; hence, this design uses an inexpensive synchronous-rectifier-based MC33166/7 circuit....
Buck Configuration High-Power LED Driver: Microchip Application Note - Published 4-Jan-06 (app note added 6/06)
Buck Converter Chargers also Provides System Power: 05/22/97 EDN Design Ideas / (added 4/02) -- Switching Regulator provides the charge voltage setpoint with Current regulation, and second Switching Regulator provides5V System Power -- Many systems require long-time operation during periods of power loss. Often, a gel or wet-cell lead-acid battery is the best choice because of high capacity and relatively low cost. The battery charges during normal operation and powers the system during power loss. These systems require a circuit to charge the battery as well as to regulate the system's VCC. The design must provide a current-limited voltage to the battery for charging and still develop system VCC in the charge or the discharge condition.....
Buck Converter Handles Battery Backup System: 04/24/03 EDN Design Ideas / (added 12/04) 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......
Buck converter works efficiently from phone line: 02/15/00 EDN-Design Ideas / (added 2/06)
Buck IC Boosts Battery Voltage for White LED: 04/24/03 EDN Design Ideas / (added 1/05) 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....
Buck or Boost: Rugged Fast 60V Synchronous Controller Does Both: DN370 - Design Notes (Linear Technology) (app note added 1/06)
Buck Reference Design: This reference design is a buck converter that can deliver up to 2A of continuous current at -24 V from an input range of -35 V to -75 V. By referencing the UCC3813 controller to the negative input rail, the N-channel MOSFET is easily driven. This design achieves a peak efficiency greater than 95%. The UCC3813 provides current mode control for excellent line and load transient response. (added 3/05)
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