Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3427
Edited by the Electronicstalk Editorial Team on 27 March 2006
Boost convertor shrinks handheld
supplies
A 1.25MHz current-mode synchronous boost DC/DC convertor includes true output disconnect, inrush current limiting and integrated soft-start capability packaged in a 2 x 2mm DFN-6.
New from Linear Technology, the LTC3427 is a 1.25MHz current-mode synchronous boost DC/DC convertor with true output disconnect, inrush current limiting and integrated soft-start capability packaged in a 2 x 2mm DFN-6 Its internal switches provide a 500mA current limit (minimum) and deliver output voltages as high as 5.25V from an input range of 1.8 to 5V, making the device compatible with both Li-ion and dual cell alkaline/NiMH applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3427 delivers up to 200mA of continuous output current (at 3.3V) from dual alkaline cells.
Its synchronous rectification enables efficiencies of up to 94%.
Also, its 1.25MHz constant switching frequency minimises switching noise and enables the use of a tiny low cost inductor and capacitors.
The combination of a 2 x 2mm DFN and tiny externals provides a very compact, low profile solution footprint required in battery powered handheld applications.
The LTC3427 uses internal switches with an on-resistance of only 0.52ohm (N-channel) and 0.57ohm (P-channel) to deliver efficiencies as high as 94%.
The device's true output disconnect feature allows the output to be completely disconnected in shutdown.
It also limits the inrush of current during start-up, minimising surge currents seen by the input supply.
Additional features include antiringing control, short-circuit protection, programmable soft start and thermal protection.
The LTC3427 is ideal for boost applications requiring up to 200mA of output current, and where a small solution size and maximum battery run-time are defining factors.
LTC3427EDC is available from stock in a 6-lead DFN package.
1000-piece pricing starts at $1.75 each. Request a free brochure from Linear Technology Corp ...
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