DC/DC controllers for space-critical applications
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Sep 17, 2009
Linear Technology has introduced the LTC3878 and LTC3879 high-efficiency no RSENSE synchronous step-down DC/DC controllers.
The company said the controllers' constant on-time valley current mode control and low 43ns minimum on-time allow low duty cycles, ideal for high step-down ratios and a fast transient response.
Linear Technology has introduced the LTC3878 and LTC3879 high efficiency no RSENSE synchronous step-down DC/DC controllers.
Both parts feature an input voltage range from 4-38V.
The on-board N-channel Mosfet driver allows the use of high-power external Mosfets to produce output currents up to 20A with an efficiency of 95 per cent, making them well suited for distributed power supplies, embedded computing and other point-of-load regulation applications.
The LTC3878 has an output voltage range of 0.8V to 90 per cent of VIN, while the LTC3879 has an output range of 0.6V to 90 per cent of VIN.
Both parts are designed to be stable with all-ceramic output capacitor designs for space-constrained applications.
The operating frequency is programmed with an external resistor and allows for up to 1MHz switching.
No sense resistor is required, and the output current is measured by sensing the voltage drop across the synchronous Mosfet.
Selectable continuous or discontinuous mode operation provides high efficiency at light load and safely powers up into pre-biased outputs.
Both parts have programmable current limit and the output current folds back during an overload condition.
They have +/-1 per cent accurate voltage reference over a -40C to 85C operating temperature range.
Linear Technology said system supervisory ICs, microcontrollers and digital signal processors all benefit from the LTC3879's output voltage tracking for flexible start-up and shutdown sequencing.
Additional features include programmable soft start, a power-good output and overvoltage protection.
The LTC3878 is housed in a narrow 16-pin SSOP package and is pin-to-pin compatible with the LTC1778 for an easy upgrade path.
The LTC3879 is offered in thermally enhanced 3 x 3mm QFN-16 and MSOP-16E packages.
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Contact Linear Technology Corp
Tel +44 1628 477066
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