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Linear Tech rolls out latest synchronous step-down controller

Posted: 26 Sep 2005     Print Version  Bookmark and Share

Keywords:linear technology  ltc3809-1  controller 

Linear Technology Corp. rolled out a No RSENSE synchronous step-down controller in a 3-by-3mm DFN-10 (or MSOPE-10). The new LTC3809-1's 550KHz frequency and current mode architecture with MOSFET VDS sensing eliminates the need for a current sense resistor while delivering efficiencies as high as 95 percent. This product's input voltage range of 2.75V to 9.8V makes it a suitable solution for single or dual Li-ion or multi-cell NiMH/NiCd/Alkaline applications, as well as standard 3.3V and 5V rails to operate in Burst Mode with only 100µA of quiescent current, or in a pulse skipping or forced continuous mode for low out put voltage ripple.

The LTC3809-1 off a user-adjustable tracking/soft-start input that smoothly ramps the out put voltage during startup. Other features include default internal soft-start circuitry, an auxiliary winding regulation and output over-voltage protection.

The LTC3809EDD-1 and LTC3809EMSE-1 are both available from stock in a 3-by-3mm DFN-10 and MSOPE-10 packages, respectively. Pricing starts at $2.50 each in 1,000-piece quantities.




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