Tag Archives: Buck

150VIN & VOUT Synchronous 4-Switch Buck-Boost Controller with Integrated Switching Bias Supply

Analog Devices announces the Power by Linear™ LTC3777, a 150V high efficiency (up to 99%) 4-switch synchronous buck-boost DC/DC controller, which operates from input voltages above, below or equal to the regulated output voltage. Its 4.5V to 150V input voltage range operates from a high input voltage source or from an input that has high voltage surges, eliminating the need for external surge suppression devices, ideal for transportation, industrial and medical applications.

To prevent high on-chip power dissipation in high input voltage applications, the LTC3777 integrates a low quiescent current high efficiency switching bias supply for its internal power consumption. The output voltage of the LTC3777 can be set from 1.2V to 150V at output currents up to tens of amps, depending on the choice of external components. Output power up to 500W can be delivered with a single device. Higher powers can be achieved when multiple circuits are configured in parallel. The LTC3777’s powerful 1.5Ω N-channel MOSFET gate drivers can be adjusted from 6V to 10V, enabling the use of logic-level or standard-threshold MOSFETs.

The LTC3777 employs a proprietary current mode control architecture for constant frequency in buck, boost or buck-boost modes. The operating frequency can be synchronized to an external clock from 50kHz to 600kHz, while an input/output constant current loop provides support for battery charging and overload protection. The user can select either forced continuous mode or discontinuous mode to maximize light load efficiency. Additional features include seamless transfers between operating regions, a power good output voltage monitor, adjustable soft-start and input overvoltage lockout, and output voltage disconnect during shutdown.

The LTC3777 is available in a 48-lead e-LQFP package with pin skipping for high voltage spacing. Extended and industrial versions are available from –40 to 125°C.

Summary of Features: LTC3777

  • 4-Switch Synchronous Current Mode Buck-Boost Architecture
  • Operation with Input Voltages Above, Below or Equal to the Output Voltage
  • 4.5V to 150V Input Voltage Range
  • 1.2V to 150V Output Voltage Range
  • Up to 99% Efficiency
  • Integrated Switching Bias Supply
  • Input or Output Average Current Limit
  • Adjustable 6V to 10V MOSFET Gate Drivers
  • Compatible with Logic-Level or Standard-Threshold NMOS
  • 500 Watts Output Power Capable with a Single Device
  • Fixed Synchronizable Operating Frequency from 50kHz to 600kHz
  • Output Voltage Disconnect from VIN During Shutdown
  • Adjustable Soft-Start
  • ±1% Reference Voltage Accuracy over -40°C to 125°C
  • 48-Lead e-LQFP Package with High Voltage Pin Skipping

[source]

36V, 2-ch, 1.6A synchronous buck LED driver has I²C dimming

Under the “Power by Linear” branding it recently created for the product lines it acquired with its purchase of Linear Technology, Analog Devices has added the LT3964, a dual channel, 36V, high efficiency, synchronous, step-down LED driver with internal 40V, 1.6A power switches and an I2C interface that simplifies LED dimming control.

Boost Converters and Buck Converters: Power Electronics

Boost Converters and Buck Converters: Power Electronics  – [Link]

Buck regulators accept up to 40-V input

by Susan Nordyk @ edn.com:

A wide input range of 4.5 V to 40 V enables the TS3004x series of DC/DC synchronous buck regulators from Semtech to work in a wide range of applications, including industrial, telecommunication, and consumer. The current-mode TS30041 and TS30042 furnish 1 mA and 2 mA of continuous output current, respectively, and include integrated power switches and robust fault protection in a small 3×3-mm, 16-lead QFN package.

Buck regulators accept up to 40-V input – [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]

Semtech TS30041 – Buck regulators accept up to 40-V input

ts3004x-bd

A wide input range of 4.5 V to 40 V enables the TS3004x series of DC/DC synchronous buck regulators from Semtech to work in a wide range of applications, including industrial, telecommunication, and consumer. The current-mode TS30041 and TS30042 furnish 1 mA and 2 mA of continuous output current, respectively, and include integrated power switches and robust fault protection in a small 3×3-mm, 16-lead QFN package. by @ edn.com

Semtech TS3004x – Buck regulators accept up to 40-V input – [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]

Intersil’s Switching Regulators Adopted in Huawei P9 Smartphone

isl91110-huawei-medium

Intersil announces the adoption of its latest family of buck-boost switching regulators in one of Huawei’s newest smartphone. The ISL91110 buck-boost switching regulator powers the Huawei P9 smartphone’s key system peripherals providing excellent efficiency and performance. [via]

Intersil’s ISL91110 buck-boost switching regulator supplies power to key system peripherals in the P9 dual-camera smartphone, using a proprietary, fully synchronous four-switch architecture. This advanced architecture enables the seamless transition from buck to boost and delivery of up to 2.5A output current at the lowest single-cell Li-ion battery voltages to extend battery life.

We previously covered a member of this family. Check it here: ISL91128 – A New Buck-Boost Regulator With I2C Interface From Intersil

Intersil’s Switching Regulators Adopted in Huawei P9 Smartphone – [Link]