Synchronous buck-boost DC/DC controller uses single Inductor to provide high efficiency performance
December 13, 2010 // Paul Buckley
Linear Technology Corporation has introduced a high efficiency (up to 98%) synchronous buck-boost DC/DC controller that operates from input voltages above, below or equal to the regulated output voltage. High power circuits that step-up and-down typically rely on transformers or two DC/DC converters, one for step-up (boost) and the other for step-down (buck) conversion.
The LTC3789 operates using a single inductor with 4-switch synchronous rectification and can deliver output power up to 150 W with a single device. Even higher output power can be achieved when multiple circuits are paralleled.
The LTC3789 operates with a selectable fixed frequency between 200 kHz and 600 kHz, and can be synchronized to an external clock over the same range with its integrated phase-locked loop (PLL). Its wide 4 V to 38 V input range, 0.8 V to 38 V output range and seamless transitions between operating modes make it ideal for a wide range of industrial controls, automotive, solar and high power battery-supplied systems.
The LTC3789 employs a proprietary current-mode control architecture for constant frequency operation in buck or boost mode and has powerful onboard quad N-channel MOSFET gate drivers.
The LTC3789 also provides an accurate, constant-current regulation loop for either input or output current, over a wide input voltage range. The input current limit function prevents overloading of the input source, and the output current limit provides an easy solution for regulated output current applications such as battery charger or LED drivers.
Fault protection is provided for overvoltage, overcurrent and short circuit conditions in all operating modes. In addition, the LTC3789 disconnects the input voltage from the output when in shutdown. The user can select continuous or pulse skip mode to maximize light load efficiency. Furthermore, the LTC3789 has adjustable soft-start, a power good output and maintains ±1.5% reference voltage accuracy over an operating junction temperature range of -40 to 125 °C.
Availability and Pricing
The LTC3789 is available in 28-pin 4 mm x 5 mm QFN and 28-lead SSOP packages. Pricing starts at $4.65 each in 1,000-piece quantities.
More information about the LTC3789 synchronous buck-boost DC/DC controller at www.linear.com/3789
Visit Linear Technology at www.linear.com
Are you worth insuring? Wearables to decide
January 30, 2015
At Cicor's first Innovation Insights Symposium held in Zurich end of January, the focus was very much on smart wearables ...
Security flaw in BMW's ConnectedDrive detected
Quantum entanglement now on-a-chip
Single crystal perovskites promise cheaper solar cells and LEDs
Wafer-scale perovskite solar cells on the horizon
Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
January 30, 2015
The large number of electronics in an automobile must have reasonably low electromagnetic interference (EMI) in order to ...
Privately-owned car not on the red list, study says
Private equity buys Canadian MEMS foundry
Tronics launches IPO
- Sensing Elements for Current Measurements
- Investigating Die attach Failure in IGBTs using Power Cycling Tests
- Power Semiconductor Failure Diagnosis using Thermal Characterization and Power Cycling
- Top 5 Trends in Product Development and Test Engineering
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.