Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3822
Edited by the Electronicstalk Editorial
Team on 18 December 2006
Input DC/DC controller drives N-Channel
Mosfets
Linear Technology has introduced the LTC3822, a 2.75 to 4.5V input synchronous step-down DC/DC controller that drives N-channel Mosfets without requiring an external supply for gate drive.
Linear Technology has introduced the LTC3822, a 2.75 to 4.5V input synchronous step-down DC/DC controller that drives N-channel Mosfets without requiring an external supply for gate drive In addition, the LTC3822 eliminates the need for a sense resistor by using Mosfet RDS(ON) sensing current, which improves efficiency and reduces solution cost
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Although the LTC3822 drives N-channel Mosfets, it is capable of operation at 99% duty cycle for very low dropout regulation.
An adjustable operating frequency from 300kHz to 750kHz allows designers to size their systems, minimise noise interference and optimise efficiency.
Applications include point-of-load conversion from 3.3VIN and portable devices with single Li-Ion batteries for up to 20A load current requirements.
The LTC3822 provides excellent line and load regulation as well as fast transient response with its constant frequency current mode operation.
The output is adjustable from 0.6V to 99% of the input voltage.
Internal soft-start circuitry guarantees controlled startup to minimise inrush current and ensure proper regulation.
The LTC3822 consumes only 340uA during operation and only 7.5uA in shutdown.
The LTC3822 is offered in two packages a 10-lead MSOP and a smaller 3mm x 3mm DFN.
It is rated for operation from -40 to 85C.
1000-piece pricing is set at USDF2.10 each. Request a free brochure from Linear Technology Corp ...
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