Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3544
Edited by the Electronicstalk Editorial
Team on 28 September 2007
Regulator reduces four-output real
estate
High-efficiency 2.25MHz synchronous buck regulator that delivers four outputs from a 3 x 3mm QFN package.
New from Linear Technology is a quad-channel high-efficiency 2.25MHz synchronous buck regulator that delivers up to 300mA, dual 200mA and 100mA continuous outputs from a 3 x 3mm QFN package Using a constant frequency current mode architecture, the LTC3544 operates from an input voltage range of 2.25 to 5.5V, making it ideal for single-cell Li-ion/polymer, or multicell alkaline/NiCad/NiMH applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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It can generate output voltages as low as 0.8V, enabling it to power the latest generation of low voltage DSPs and microcontrollers.
Its 2.25MHz switching frequency enables the utilisation of tiny, low cost ceramic capacitors and inductors less than a 1mm in height, which combined with a 3 x 3mm QFN package, provide a very compact quad-output solution.
The LTC3544's Burst Mode operation minimises quiescent current to only 70uA total for all four channels under no load conditions.
For applications that require the lowest noise possible, the LTC3544B uses a pulse skipping mode in lieu of Burst Mode operation for lowest output ripple.
Both devices deliver efficiencies as high as 95% and offer shutdown current less than 1uA.
The LTC3544 and LTC3544B use low dropout 100% duty cycle operation, allowing output voltages equal to the input level, further extending battery runtime.
Each channel has independent enable pins and internal soft-start, further enhancing design flexibility.
Other features include short-circuit protection and overtemperature protection.
The LTC3544EUD and LTC3544BEUD are both available from stock in 16-lead 3 x 3mm QFN packages.
Pricing starts at US $2.95 each in 1000-piece quantities for both versions. Request a free brochure from Linear Technology Corp ...
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