Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3772
Edited by the Electronicstalk Editorial Team on 31 May 2005
Controller needs no current sense
resistor
The LTC3772 is a constant frequency current mode step-down DC/DC controller in choice of 2 x 3mm DFN and low profile 8-lead ThinSOT packages.
New from Linear Technology, the LTC3772 is a constant frequency current mode step-down DC/DC controller in 2 x 3mm DFN and low profile 8-lead ThinSOT packages The device operates from an input voltage range of 2.75 to 9.8V and can deliver up to 5A of output current to voltages as low as 0.8V, making it ideal for single and dual cell Li-ion powered applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Its "no Rsense" architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.
The LTC3772 automatically switches into burst mode operation at light loads to increase efficiency at low output current.
It consumes only 40uA of quiescent current under a no-load condition.
The LTC3772 incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V.
To maximise runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).
A high switching frequency of 550kHz allows the use of a small inductor and capacitors.
Additionally an internal soft-start smoothly ramps the output voltage from zero to its regulation point.
The LTC3772EDDB is available from stock in a low profile (0.75mm) 2 x 3mm DFN-8 package and the LTC3772ETS8 is available in an 8-lead ThinSOT package.
Pricing for either device starts at $1.85 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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