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
Cadence breaks into top four in semi IP core ranking
April 23, 2014
Cadence Design Systems Inc. moved into the top four of semiconductor IP core suppliers in 2013 spurred by its renewed IP ...
Get your IT infrastructure assessed for free
Custom processor tool wins $2.8m backing
Mixture of graphene/carbon nanotubes produce low-cost ultracapacitors
OLEDs help NASA focus space biology research
Display Stream Compression standard boosts display interfaces to 8K
April 23, 2014
The Video Electronics Standards Association (VESA), working in liaison with the MIPI Alliance, has unveiled the Display Stream ...
Hard wired floating point changes FPGA
Printoo: printed electronics made Arduino-compatible
Magnetic RAM set for 50% CAGR, says report
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
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, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
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.