Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3549
Edited by the Electronicstalk Editorial
Team on 27 December 2006
High-frequency regulator raises
efficiency
High-efficiency 2.25MHz synchronous buck regulator can deliver up to 250mA of continuous output current from input voltages as low as 1.6V.
Linear Technology has announced the LTC3549, a high-efficiency 2.25MHz synchronous buck regulator that can deliver up to 250mA of continuous output current from input voltages as low as 1.6V Using a constant frequency and current mode architecture, the LTC3549 operates from an input voltage range of 1.6 to 5.5V, making it ideal for single-cell Li-ion, or dual-cell 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 0.61V, enabling it to power the latest generation of low-voltage DSPs and microcontrollers.
Its 2.25MHz switching frequency enables the use of tiny low-cost ceramic capacitors and inductors less than 1mm in height, providing a highly compact solution footprint for handheld applications.
The LTC3549 uses internal switches with an on-resistance of only 0.4ohm (N-channel) and 0.56ohm (P-channel) to deliver efficiencies as high as 93%.
It also uses low dropout 100% duty cycle operation to allow output voltages equal to the input, further extending battery run-time.
The LTC3549 uses low ripple Burst Mode operation to provide only 50uA no load quiescent current with less than 20mV peak-peak of output ripple.
If the application is noise sensitive, the LTC3549 can be set in an even lower noise pulse-skipping mode, yet still offers only 300uA of quiescent current.
Both parts maintain shutdown current of less than 1uA, further maximising battery life.
The LTC3549 is stable with ceramic capacitors, achieving very low output voltage ripple.
Other features include current mode operation for excellent line and load transient response, internal soft-start and over-temperature protection.
The LTC3549EDCB is available from stock in 6-lead 2 x 3mm DFN packages.
Pricing starts at US $1.35 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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