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6 Apr 2015

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An application note from TI, TPS6122x low input voltage, 0.7V boost converter with 5.5μA quiescent current (PDF!):

The TPS6122x family devices provide a power-supply solution for products powered by either a single-cell, two-cell, or three-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer battery. Possible output currents depend on the input-to-output voltage ratio. The boost converter is based on a hysteretic controller topology using synchronous rectification to obtain maximum efficiency at minimal quiescent currents. The output voltage of the adjustable version can be programmed by an external resistor divider, or is set internally to a fixed output voltage. The converter can be switched off by a featured enable pin. While being switched off, battery drain is minimized. The device is offered in a 6-pin SC-70 package (DCK) measuring 2 mm x 2 mm to enable small circuit layout size.

TPS6122x low input voltage, 0.7V boost converter with 5.5μA quiescent current – [Link]

17 Mar 2015

3118by Susan Nordyk @ edn.com

A synchronous buck-boost DC/DC converter that accepts 2.2 V to 18 V on each of its two inputs, the LTC3118 from Linear Technology enables high-efficiency operation from either input source to a programmable output voltage above, below, or equal to the inputs. Its dual-input capability is suitable for applications that employ batteries or supercaps as secondary or backup inputs, as well as those that use multiple sources, such as a wall adapter and Li-Ion cells.

The current-mode converter has a fixed 1.2-MHz switching frequency and furnishes up to 2 A of continuous output current from a wide range of power sources, including single or multiple-cell batteries, supercapacitor stacks, and wall adapters. Output voltage is programmable from 2 V to 18 V. Integrated low-loss PowerPath control is also user-programmable to prioritize and seamlessly transition between inputs, while maintaining output voltage regulation.

Buck-boost converter works with dual inputs – [Link]

11 Mar 2015

3899

The LTC®3899 is a high performance triple output (buck/ buck/boost) DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. The constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. The LTC3899 operates from a wide 4.5V to 60V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC3899 can operate from an input supply as low as 2.2V after start-up.

LTC3899 – 60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller – [Link]

3 Mar 2015

 

LT3042

The LT3042 is an ultralow noise, ultrahigh power supply ripple rejection (PSRR) low dropout voltage linear regulator. Its unique design features ultralow spot noise of only 2nV/√Hz at 10kHz and 0.8μV integrated output noise across a wide 10Hz to 100kHz bandwidth. Low frequency PSRR exceeds 90dB out to 10kHz and high frequency PSRR exceeds 75dB out to 3MHz, quieting noisy or high ripple input supplies. The LT3042 delivers up to 200mA output current with a 350mV dropout voltage at full load, across a wide 1.8V to 20V input voltage range. The LT3042 utilizes LTC’s proprietary LDO architecture – a precision current source reference followed by a high performance unity gain buffer, resulting in virtually constant bandwidth, noise, PSRR and load regulation performance independent of output voltage. In addition, this architecture permits paralleling of multiple LT3042s to further decrease noise, increase output current and spread heat on a printed circuit board (PCB).

LTC3402 – 2A, 3MHz Micropower Synchronous Boost Converter – [Link]

 

 


3 Feb 2015

8709

by Susan Nordyk @ edn.com:

A synchronous PWM controller for negative-to-negative or negative-to-positive DC/DC conversion, the LT8709 from Linear Technology is easily configured for buck, boost, buck-boost, and inverting topologies to accommodate a wide range of power-supply designs. The device’s synchronous operation means that the output diode is replaced with a high-efficiency P-channel MOSFET, increasing efficiency and allowing for higher output currents of up to 20 A. It also eliminates the heat sink typically required in medium- to high-power applications.

The LT8709 operates over an input range of -4.5 V to -80 V and produces an output from -0.1 V to as high as 60 V or from -1.4 V to as low as -80 V. Its rail-to-rail output-current monitor and control enable the device to be configured as a current source. The controller has an EN/FBIN pin that accepts slowly varying input signals, as well as an adjustable undervoltage lockout function.

Buck/boost/inverting controller delivers up to 20 A – [Link]

22 Sep 2014

How boost converters work and how to build a 50W adjustable boost converter circuit.

DC-DC Boost converter tutorial – [Link]

7 Aug 2014

2014-05-14-20-33-36-600x450

Jianan Li made this LiPo Booster project, that is available at Github:

LiPo Booster is a breadboard-friendly boost converter board based on the TPS61230 IC from Texus Instrument. It has an output voltage of 5V, and is designed to be used with a single cell LiPo battery.

[via]

LiPo Booster, a breadboard-friendly boost converter board based on TPS61230 – [Link]

4 Aug 2014

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An application note from Texas Instruments, white LED driver with digital and PWM brightness control (PDF!):

With a 40-V rated integrated switch FET, the TPS61160/1 is a boost converter that drives LEDs in series. The boost converter runs at 600kHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external components.
The default white LED current is set with the external sensor resistor Rset, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, the LED current can be controlled using the 1-wire digital interface ( Easyscale™ protocol) through the CTRL pin.

[via]

App note: White LED driver with digital and PWM brightness control – [Link]

21 Jul 2014

TPS43061

TI’s TPS43061 is a low IQ current-mode synchronous boost controller with wide input voltage range from 4.5V to 38V, boosted output range up to 58V, operates over an extended junction temperature range of -40 to 150°C and includes an integrated boot diode and a 5.5V gate-drive optimized to reduce switching loss with lower Qg NexFET™ technology.

TPS43061 – Small-Size, High-Efficiency, Low-lQ Synchronous Boost Controller – [Link]

8 Jun 2014

article-2014may-dcdc-converter-topologies-fig4

by Ashok Bindra:

Whether it is used for biasing avalanche photodiodes (APDs) found in optical receivers, driving photoflash tubes in flash cameras, or charging high-voltage capacitors, the need for high-voltage sources continues to grow. Consequently, in battery-powered units where the input supply voltage is low, step-up or boost DC/DC converters are required to generate voltages that can be several times the input. To address these requirements, suppliers such as Analog Devices, Linear Technology, Maxim Integrated, and Micrel Inc., among others, have produced boost converters with output voltages at 70 V and above.

This article examines such solutions and discusses the topologies and techniques used by each to boost output voltages by ratios of 10:1 or better in order to generate high-DC voltages from very-low DC inputs.

DC/DC Converter Topologies and Techniques to Obtain High Boost Ratios – [Link]



 
 
 

 

 

 

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