DC to DC Power Supplies (Converters)
Buck-Boost DC/DC Controller has single-inductor design.
Share:
Press Release Summary:
With 4-30 V input and 0.8-30 V output ranges, LTC3780 buck-boost switching regulator controller operates from input voltages above, below, or equal to output voltage using one inductor and delivers output power up to 75 W. Constant frequency current mode architecture allows phase-lockable frequency from 200-400 kHz, while 4-switch synchronous rectification delivers efficiencies to 97%. Unit features over voltage and current protection.
Original Press Release:
Single-Inductor High Power Buck-Boost DC/DC Controller
Milpitas, CA - March 30, 2005 - Linear Technology Corporation introduces the LTC3780, a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. Until now, high power buck-boost circuits have relied on transformers or two DC/DC converters - one for step-up (boost) and the other for step-down (buck) conversion. The LTC3780 operates using a single inductor and can deliver output power as high as 75W; a 4-switch synchronous rectification delivers efficiencies up to 97%. The constant frequency current mode architecture allows a phase-lockable frequency of up to 400kHz. With a wide 4V to 30V (36V max) input and 0.8V to 30V output range and seamless transitions between operating modes, the LTC3780 is ideal for automotive, telecom and battery-powered systems.
The LTC3780 employs a proprietary current control architecture for constant frequency operation in buck or boost mode. In addition, fault protection is provided for overvoltage, over current and short circuit conditions in all operating modes. A power good output open-drain pin signals whether the output voltage is in or out of regulation. The LTC3780 offers three operating modes: constant frequency, Burst Mode" Operation, and discontinous current.
The LTC3780 is offered in 24-lead SSOP and 5mmx5mm QFN packages. 1,000-piece price starts at $4.65 each.
Summary of Features: LTC3780
Single Inductor Architecture Allows Operation with Input Voltage Below, Above or Equal to Output Voltage
4V to 36V Input Voltage Range
4-Switch, Synchronous Operation for up to 97% Efficiency
±1% Output Voltage Accuracy from 0.8V to 30V
Phase-Lockable Fixed Frequency from 200kHz to 400kHz
Over Voltage and Current Protection
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
LT, LTC and Burst Mode are registered trademarks of Linear Technology Corp.
Contacts
North America
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
