Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3541
Edited by the Electronicstalk Editorial
Team on 24 May 2007
Two regulators in one cut supply size
A 500mA high-efficiency 2.25MHz synchronous buck regulator is combined with a 300mA VLDO in a single package.
Available now from Linear Technology, the LTC3541 combines a 500mA high-efficiency 2.25MHz synchronous buck regulator with a 300mA VLDO in a single package The device provides two high efficiency voltage rails from a single input requiring only a single inductor
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The synchronous buck regulator delivers up to 95% efficiency, whereas the VLDO output offers very low noise.
The input voltage range of 2.7 to 5.5V makes the device ideal for single cell Li-ion/polymer or multicell alkaline/NiCd/NiMH powered applications.
The LTC3541 can generate output voltages as low as 0.8V from the buck regulator and 0.4V from the VLDO, enabling it to power the latest generation of microcontrollers.
The buck regulator's 2.25MHz switching frequency and the VLDO design enable the use of tiny low-cost external components, providing a very compact solution footprint for handheld applications.
All versions of the LTC3541 can be programmed via an external pin to have the synchronous buck power up independently or simultaneously with the VLDO.
Additionally, when both the synchronous switcher and the VLDO are enabled, an automatic startup sequencing feature brings up either the switcher or the VLDO in a specific order.
The LTC3541 and LTC3541-2 have an automatic startup feature that brings the buck output into regulation prior to enabling the VLDO regulator.
Alternatively, the LTC3541-1 and LTC3541-3 bring the VLDO into regulation prior to enabling the switching regulator.
The VLDO can either be operated directly from the output of the switching regulator, for maximum efficiency, or from a separate input from 0.9 to 4.1V.
An automatic Burst Mode feature reduces quiescent current in the switcher to only 85uA, thereby maximising battery run-time.
For applications that are particularly noise sensitive, the Burst Mode feature can be disabled and replaced with either a pulse skipping or continuous switching operation.
Other features include a power-good output and over-temperature protection.
All versions of the LTC3541 are available from stock in a 10-lead 3 x 3mm DFN package.
Pricing starts at US $1.95 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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