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DC/DC controller produces output currents up to 25A

Posted: 19 Jul 2011     Print Version  Bookmark and Share

Keywords:synchronous  step-down  dc/dc controller 

Linear Technology Corp. debuts the H- and MP- grade versions of the LTC3851A, a wide input voltage range (4–38V) synchronous step-down DC/DC controller that features on board MOSFET gate drivers enabling the use of high power external MOSFETs to produce output currents up to 25A with output voltages ranging from 0.8–5.5V, designed for point-of-load requirements, including most intermediate bus voltages and battery chemistries.

According to Linear, the H- and MP-grade versions are tested and guaranteed to operating junction temperature ranges from -40°C–150°C and -55°C–150°C, respectively. Applications include automotive systems, industrial, medical, datacom and telecom.

A constant-frequency, current-mode architecture allows a selectable fixed or phase-locked loop (PLL) frequency from 250–750kHz. Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) or using an optional sense resistor. Current foldback limits MOSFET heat dissipation during short circuit and overload conditions. Selectable continuous, pulse skipping or burst mode operation is user controlled to optimise light load efficiency. With up to 99 percent duty cycle, the LTC3851A/-1 has a very low dropout voltage, a useful feature for extending run times in battery powered applications. Additional features include tracking and adjustable soft-start. The LTC3851A-1 differs from the LTC3851A in that it has a power good signal instead of adjustable current limit.

The LTC3851AH/-1 and LTC3851AMP/-1 are available in a thermally enhanced MSOP-16 package. The 1000-piece price starts at Rs.100 ($2.24) each for the H-grade devices and Rs.236.16 ($5.29) each for the MP-grade parts, respectively.

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