Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3442
Edited by the Electronicstalk Editorial Team on 11 April 2005
Buck-boost convertor delivers up to 1.2A
The LTC3442 is a true buck-boost DC/DC convertor that delivers up to 1.2A of continuous output current at efficiencies as high as 95%.
Available now from Linear Technology, the LTC3442 is a true buck-boost DC/DC convertor that delivers up to 1.2A of continuous output current at efficiencies as high as 95% The LTC3442 is a synchronous, fixed frequency, buck-boost DC/DC convertor designed to optimise battery run time for single cell Li-ion, multicell alkaline or NiMH battery powered applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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It operates from an input voltage range of 2.4 to 5.5V and can provide a fixed output voltage between 2.4 to 5.25V.
The LTC3442 has a programmable switching frequency that can be set between 300kHz and 2MHz via a single resistor, allowing designers to set the frequency for optimum efficiency, smallest external components or to avoid critical noise sensitive frequency bands.
The LTC3442 uses a unique buck-boost topology, allowing it to operate above, below and equal to the output voltage with a single inductor.
This synchronous buck-boost topology delivers up to 95% efficiency over the entire Li-ion battery range, unlike a SEPIC or boost/LDO combination which offer efficiencies in the mid-70% range.
It provides a continuous transfer function through all the operating modes as the battery voltage declines.
The small implementation footprint makes it ideal for space-constrained environments such as cellular phones, PDAs, wireless and DSL modems and digital cameras.
The LTC3442 uses two 0.10ohm N-channel and two 0.11ohm P-channel switches in a constant frequency, synchronous switching topology to obtain efficiencies as high as 95%.
An average input current limit is user programmable for applications such as USB power.
The LTC3442's burst mode operation can be programmed to automatically engage at a user determined current level, optimising battery run-time for each application.
Burst mode operation reduces quiescent current to only 35uA with light loads.
Integrated output disconnect in shutdown reduces ISD to less than 1uA while improving system reliability.
The LTC3442 also features antiringing control to minimise EMI, soft-start control and thermal shutdown.
The combination of the tiny solution footprint and buck-boost topology make the LTC3442 ideal for handheld applications, which require both optimum battery run-time and small size.
The LTC3442 is available from stock in a 4 x 3mm DFN package.
Pricing starts at $3.95 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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