Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3740
Edited by the Electronicstalk Editorial Team on 27 March 2007
Step-down controller steps up to drive
MOSFETs
High-output-power step-down synchronous controller operates from very low input voltages without needing an auxiliary 5V gate drive supply.
Linear Technology has introduced the LT3740, a high output power step-down synchronous controller that operates from very low input voltages without needing an auxiliary 5V gate drive supply In addition to a DC/DC step-down controller, the LT3740 integrates a DC/DC step-up convertor for generating its own MOSFET gate drive voltage
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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This function permits the use of inexpensive off-the-shelf 5V gate-drive N-channel MOSFETs, offering up to 3% higher efficiency than sublogic gate-drive MOSFETs and eliminating the need for a secondary supply.
The LT3740 is ideal for converting input supplies ranging from 2.2 to 22V to an output as low as 0.8V and at load currents from 2 to 20A with 93% typical efficiency.
Applications include distributed power systems, point-of-load regulation and conversion of logic supplies.
In particular, the LT3740 can step down from 5, 3.3 and 2.5V rails.
The LT3740 operates at a fixed frequency of 300kHz and employs valley current mode control to deliver excellent transient response and very low on-times.
In addition, the LT3740 uses low-side MOSFET current-sense architecture for current limiting and overload protection, eliminating the need for a sense resistor while improving efficiency.
Three current limit threshold levels can be selected by connecting the range pin to ground, open or the input voltage.
Furthermore, a power good signal is available to monitor the output voltage and the device has a tracking function that allows output voltage control during power up and power down.
The LT3740 is offered in a 16-lead 5 x 3mm DFN package with an operating temperature range from -40 to +85C.
Pricing starts at US $1.95 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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