Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3809-1
Edited by the Electronicstalk Editorial Team on 14 December 2005
Controller needs no current sense
resistor
The LTC3809-1 is a no-sense-resistor synchronous step-down controller in a 3 x 3mm DFN-10 (or MSOPE-10).
New from Linear Technology, the LTC3809-1 is a no-sense-resistor synchronous step-down controller in a 3 x 3mm DFN-10 (or MSOPE-10) The device's 550kHz frequency and current mode architecture with MOSFET drain-source-voltage sensing eliminates the need for a current sense resistor and delivers efficiencies as high as 95%
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3809-1's input voltage range of 2.75 to 9.8V makes it ideal for single or dual Li-ion or multi-cell NiMH/NiCd/alkaline applications, as well as standard 3.3 and 5V rails to operate in burst mode with only 100uA 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 overvoltage protection.
The LTC3809EDD-1 and LTC3809EMSE-1 are both available from stock in 3 x 3mm DFN-10 and MSOPE-10 packages, respectively.
Pricing starts at $2.50 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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