Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3827
Edited by the Electronicstalk Editorial
Team on 21 March 2006
Dual-output power chip is frugal in
standby
A low-quiescent-current two-phase dual-output synchronous step-down DC/DC controller is ideally suited for automotive applications such as navigation systems.
Linear Technology has introduced the LTC3827, a low-quiescent-current two-phase dual-output synchronous step-down DC/DC controller The LTC3827 draws only 80uA when one output is active and only 115uA when both outputs are active, making it ideally suited for automotive applications, such as navigation systems, where one or more supplies remains active while the engine is off
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3827's input supply range of 4 to 36V is wide enough both to protect against high input voltage transients and to continue to operate during automotive cold crank.
The LTC3827 features a +/-1% internal reference and can provide output voltages from 0.8 to 10V, making it perfect for the higher voltage supplies typically required for audio systems, analogue tuners and CD/DVD players in many automobiles.
Each output can deliver up to 20A of current at efficiencies as high as 95%.
The LTC3827 is rated for operation from -40 to +85C, and has a maximum operating junction temperature of 125C.
The LTC3827's constant frequency, current mode architecture provides excellent line and load regulation, and its two-phase operation reduces input capacitance requirements.
The LTC3827 smoothly ramps each output voltage during startup using separate adjustable soft-start and tracking input pins.
It operates at a selectable frequency between 250 and 550kHz, and can be synchronised to an external clock from 140 to 650kHz using its phase-locked loop (PLL).
Output overvoltage and overcurrent (short circuit) protection are provided internally.
With both outputs shut down, the LTC3827 draws a mere 8uA.
The LTC3827 is offered in two packages: 28-lead SSOP (LTC3827-1) and 32-pin 5 x 5mm QFN (LTC3827).
The pricing for 1000-piece quantities starts at $5.00 each. Request a free brochure from Linear Technology Corp ...
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