Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3545
Edited by the Electronicstalk Editorial
Team on 28 April 2008
Three-channel regulator shrinks handset
supplies
The LTC3545 operates from an input voltage range of 2.25 to 5.5V, and can generate output voltages as low as 0.6V.
The Linear Technology LTC3545 is a three-channel high-efficiency 2.25MHz synchronous buck regulator that delivers up to 800mA of output current from each channel from a 3 x 3mm QFN package Using a constant-frequency current-mode architecture, the LTC3545 operates from an input voltage range of 2.25 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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It can generate output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers.
The LTC3545's 2.25MHz switching frequency enables the use of tiny low-cost ceramic capacitors and inductors less than 1mm in height.
This, combined with a 3 x 3mm QFN package, provides a very compact three-output power supply for handheld applications.
The LTC3545's internal synchronous switches offer efficiencies as high as 95% while Burst Mode operation minimises quiescent current to only 58uA in no load conditions.
For applications demanding the lowest possible noise, the LTC3545 can run in a pulse skipping mode to minimise output ripple.
The LTC3545 offers power-good indicators on two of its channels and is synchronisable to an external clock.
The LTC3545-1 offers power-good indicators on all three channels, but must always use burst mode operation.
Both versions of the LTC3545 use low-dropout 100%-duty-cycle operation to extend battery runtime.
Each channel has independent enable pins, offering design flexibility.
The LTC3545EUD and LTC3545EUD-1 are both available from stock in 16-lead 3 x 3mm QFN packages.
Pricing starts at US $3.10 each in 1000-piece quantities for both versions. Request a free brochure from Linear Technology Corp ...
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