Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3562
Edited by the Electronicstalk Editorial
Team on 29 February 2008
Compact convertor delivers four
independent rails
Quad-channel high-efficiency 2.25MHz synchronous buck convertor provides dual 600 and dual 400mA continuous outputs from a 3 x 3mm QFN package.
The LTC3562 from Linear Technology is a quad-channel high-efficiency 2.25MHz synchronous buck convertor that can deliver dual 600 and dual 400mA continuous outputs from a 3 x 3mm QFN package Using a constant-frequency current-mode architecture, the LTC3562 operates from an input voltage range of 2.7 to 5.5V, making it ideal for single cell Li-ion/polymer, or multicell alkaline/NiCd/NiMH applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3562 has two channels (600 and 400mA) that allow the output voltage to be adjusted by programming the feedback voltages between 425 and 800mV in 25mV increments.
The other two channels (600 and 400mA) feature fixed outputs that can be programmed between 600mV and 3.775V in 25mV steps via an I2C interface.
This level of independent output voltage control makes the LTC3562 ideal for managing multiple supply rails.
Its 2.25MHz switching frequency enables the use of tiny low-cost ceramic capacitors and inductors less than a 1mm in height.
This, combined with a 3 x 3mm QFN package, provides a very compact quad-output supply for handheld and other dense board applications.
The LTC3562 delivers up to 96% efficiency and its LDO mode operation minimises quiescent current to only 100uA in no load conditions while minimising noise.
The LTC3562 can also be programmed to use Burst Mode, pulse skipping or continuous mode operation in lieu of the LDO mode.
The LTC3562 also uses low dropout 100% duty cycle operation to allow output voltages up to VIN, further extending battery run-time.
Each channel has internal soft-start and independent enable and mode control, enhancing design flexibility.
Other features include short-circuit protection and overtemperature protection.
The LTC3562EUD is available from stock in a 20-lead 3 x 3mm QFN package.
Pricing starts at US $3.50 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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