Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3522
Edited by the Electronicstalk Editorial
Team on 13 December 2007
Regulators go high and low in one
Synchronous buck-boost convertor combines with synchronous buck regulator for powering processor applications that require both a 3.3V I/O rail and a 0.6 to 1.8V rail for the core voltage.
The LTC3522 is a dual-channel 1MHz synchronous convertor from Linear Technology One channel uses a synchronous buck-boost topology that can deliver up to 400mA of continuous output current with inputs above, equal, or below the output
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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In single cell Li-ion applications requiring a 3.3V output, the buck-boost topology enables up to 25% longer battery runtime.
The second channel is a synchronous buck regulator, which can deliver up to 200mA of continuous output current to voltages as low as 0.6V.
This combination is ideal for powering applications such as DSPs and microcontrollers that require both a 3.3V I/O rail and a 0.6 to 1.8V rail for the core voltage.
The LTC3522's 1MHz switching frequency, enables the use of tiny, low cost ceramic capacitors and inductors, combined with its 3 x 3mm QFN package, it provides a compact solution footprint.
The LTC3522's synchronous buck-boost topology on its 400mA channel enables it to regulate a constant output voltage when the input voltage is above, equal to or below the output, allowing it to use the entire stored energy of the Li-ion battery.
The LTC3522 uses automatic Burst Mode operation, requiring only 25uA (both channels) of no load quiescent current.
For applications that require very low noise, the Burst Mode function can be defeated and replaced with a continuous PWM mode.
Shutdown current is less than 1uA, further extending battery runtime.
Each channel has independent internal soft-start ensuring design flexibility.
Other features include short-circuit protection, overtemperature protection and a power good flag.
LTC3522EUD is available from stock in a 16-lead QFN package.
Pricing is US $2.50 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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