Tag Archives: boost

Multiphase, 60V synchronous boost controller peaks at 97%

LTC3897 is a multiphase synchronous boost DC/DC controller with input surge stopper and ideal-diode controller. The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, enabling the use of smaller inductors versus the single-phase equivalent. By Graham Prophet @ edn-europe.com:

Synchronous rectification increases efficiency, reduces power loss and eases thermal requirements. The input surge stopper, with adjustable clamp voltage, controls the gate of an external N-channel MOSFET to protect against high input voltage transients of greater than 100V and provides inrush current control, overcurrent protection and output disconnect. The integrated ideal diode controller drives another N-channel MOSFET for reverse input voltage protection and voltage holdup or peak detection.

12V to 24V 1A DC-DC Boost Converter using LM2588

12V To 24V Booster is based on LM2588 IC from Texas Instruments. The LM2588 regulator integrated circuit specifically designed for fly-back, step-up (Boost) , and forward converter. The board provides 24V DC 1A DC output, Input 8V to 16V DC. Board has minimum components, screw terminal provided for input & outputs.

Features

  • Supply Input 8V To 16V DC ( Ideal 12V DC)
  • Output 24V 1A

12V to 24V 1A DC-DC Boost Converter using LM2588 – [Link]

LT8390 – 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum

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The LT8390, is a synchronous buck-boost DC/DC controller that can regulate output voltage, and input or output current from input voltages above, below and equal to the output voltage. Its 4V to 60V input voltage range and 0V to 60V output voltage range are ideal for voltage regulator, battery and supercap charger applications in automotive, industrial, telecom and even battery-powered systems. The LT8390’s 4-switch buck-boost controller, combined with 4 external N-channel MOSFETs, can deliver from 10W to over 400W of power with efficiencies up to 98%. Its buck-boost capability is ideal for applications such as automotive, where the input voltage can vary dramatically during stop/start, cold crank and load dump conditions. Transitions between buck, buck-boost and boost operating modes are seamless, offering a well regulated output even with wide variations of supply voltage. The LT8390 is offered in either a 28-lead 4mm x 5mm QFN or thermally enhanced TSSOP to provide a very compact solution footprint. [source]

LT8390 – 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum – [Link]

LTC3786 – Efficient boost controller takes the heat

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Linear Technology has launched a higher-temperature 150°C version of its LTC3786 step-up DC/DC controller that boasts 98% efficiency. This H-grade device replaces the boost diode with an N-channel MOSFET for higher efficiency and reduced power loss. by Susan Nordyk @ edn.com:

The controller produces a 24-V, 5-A output from a 12-V input with up to 98% efficiency, useful for automotive, industrial, and medical applications. It operates from an input voltage ranging from 4.5 V to 38 V during startup, maintains operations down to 2.5 V after startup, and regulates an output voltage as high as 60 V. Its low quiescent current of 55 µA helps extend the run time of battery-powered applications in standby mode.

LTC3786 – Efficient boost controller takes the heat – [Link]

Single-chip USB-C buck-boost battery charger

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Intersil’s ISL9238 and ISL9238A add 5V-20V reverse boost for USB On-The-Go charging of portables such as smartphones and headphones; two USB-C buck-boost battery chargers support bidirectional power delivery in ultrabooks, tablets, power banks and other mobile products. by Graham Prophet @ edn-europe.com:

The single-chip ISL9238 and ISL9238A battery chargers can replace two-chip solutions to reduce bill of materials (BOM) costs by up to 40%. Both ICs employ Intersil’s R3 modulation technology to extend battery life and deliver acoustic noise-free operation, improved light-load efficiency and fast transient response. The ISL9238 and ISL9238A operate in forward buck, boost or buck-boost mode to fast charge mobile battery packs with up to 4-cell Li-ion batteries.

Single-chip USB-C buck-boost battery charger – [Link]

18V, 5A buck-boost DC/DC delivers 95% efficiency

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LTC3119 is a synchronous current mode monolithic buck-boost converter that outputs up to 5A of continuous output current in buck mode from a wide variety of input sources, including single- or multiple-cell batteries, unregulated wall adapters as well as solar panels and supercapacitors. By Graham Prophet @ edn-europe.com:

The device’s 2.5V to 18V input voltage range extends down to 250 mV once started. The output voltage is regulated with inputs above, below or equal to the output and is programmable from 0.8V to 18V. User-selectable Burst Mode operation lowers quiescent current to 35 µA, improving light load efficiency and extending battery run time.

18V, 5A buck-boost DC/DC delivers 95% efficiency – [Link]

48V/12V DC/DC for automotive dual-rails offers bidirectional power flows

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LTC3871 is a 100V/30V bidirectional two phase synchronous buck or boost controller, for 48V/12V automotive dual battery systems; it provides bidirectional DC/DC control and battery charging between the 12V and 48V boardnets, operating in buck mode from the 48V bus to the 12V bus or in boost mode from 12V to 48V. by Graham Prophet @ edn-europe.com

The LTC®3871 is a high performance bidirectional buck or boost switching regulator controller that operates in either buck or boost mode on demand. It regulates in buck mode from VHIGH-to-VLOW and boost mode from VLOW-to-VHIGH depending on a control signal, making it ideal for 48V/12V automotive dual battery systems. An accurate current programming loop regulates the maximum current that can be delivered in either direction. The LTC3871 allows both batteries to supply energy to the load simultaneously by converting energy from one battery to the other.

48V/12V DC/DC for automotive dual-rails offers bidirectional power flows – [Link]

How Boost Converters (DC-DC Step-Up) Works

A look into how boost converters work in a very visual format. Try this circuit: http://goo.gl/nkHq9H

How Boost Converters (DC-DC Step-Up) Works – [Link]

 

25V, 600 mA buck-boost DC/DC with 1.6 µA Iq

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LTC3130 and LTC3130-1 are synchronous current mode buck-boost converters that deliver up to 600 mA of continuous output current from a wide variety of input sources, including single- or multiple-cell batteries as well as solar panels and supercapacitors. By Graham Prophet @ edn-europe.com

Their 2.4V to 25V input voltage range and 1V to 25V output range (LTC3130 is adjustable) provide a regulated output with inputs above, below or equal to the output. User selectable Burst Mode operation lowers quiescent current to 1.6 µA (1.2 µA at no load) improving light load efficiency and extending battery run time. The proprietary buck-boost topology incorporated in the LTC3130/-1 provides low noise, jitter-free switching through all operating modes, for RF and precision analogue applications that are sensitive to power supply noise.

LT8335 – Converter minimizes quiescent current

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Outfitted with a 2-A, 28-V power switch, the LT8335 2-MHz step-up DC/DC converter from Linear Technology operates from an input of 3 V to 25 V, suitable for applications with input sources ranging from a single-cell lithium-ion battery to automotive inputs.

The LT®8335 is a current mode DC/DC converter capable of generating either positive or negative output voltages using a single feedback pin. It can be configured as a boost, SEPIC or inverting converter consuming as low as 6μA of quiescent current. Low ripple Burst Mode operation maintains high efficiency down to very low output currents while keeping the output ripple below 15mV in a typical application. The internally compensated current mode architecture results in stable operation over a wide range of input and output voltages. Integrated soft-start and frequency foldback functions are included to control inductor current during start-up. The 2MHz operation combined with the small 8-lead DFN package, enables low cost, area efficient solutions.

LT8335 – Converter minimizes quiescent current – [Link]