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
First color-tunable graphene-based LED is demonstrated
July 29, 2015
Researchers at Tsinghua University in Beijing have demonstrated an LED that can be tuned to emit different colors of light ...
Qualcomm enables wireless charging for mobile devices with metal cases
Intel, Micron launch "bulk-switching" ReRAM
Demand for radar systems boosts Infineonís chip production
'Test city' opens for autonomous cars
AMS buys environmental sensor business from NXP
July 28, 2015
AMS AG has acquired an environmental sensor business unit from NXP Semiconductors NV for an undisclosed amount of money. ...
MEMS force sensor in a chip-scale package begins sampling
World first: Samsung monitor integrates inbuilt wireless charging
Breakthrough for really cost-efficient fuel cells in sight?
- Test environment for the positioning elements of wearable devices
- Automotive Circuit Protection using Littelfuse Automotive TVS Diodes
- Top 5 Challenges for testing Today's Consumer Electronics
- Critical Requirements in High Speed Signal Generation Applications
InterviewGlobalfoundries' CEO on why FD-SOI and why now
With its latest news Globalfoundries Inc. has not only confirmed itself as a supporter of the fully-depleted silicon-on-insulator (FD-SOI) approach to IC manufacturing but that it also thinks sufficiently ...
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
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... 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.