Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Amplifiers/Converters

Ultralow-current DC/DC controller suits automotives

Posted: 23 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-down DC/DC controller? navigation systems?


Linear Technology Corp. introduces the LTC3826/-1, an ultralow quiescent current, two-phase dual output synchronous step-down DC/DC controller.

LTC3826/-1 draws only 30?A when one output is active and only 50?A when both outputs are active, making it well suited for automotive applications such as navigation systems, where one or both supplies remain active while the engine is off. With both outputs shut down, LTC3826/-1 draws a mere 4?A. LTC3826/-1's input supply range of 4-36V is wide enough both to protect against high input voltage transients and to continue operation during automotive cold crank.

The LTC3826/-1 controller features a tight 1 percent reference voltage tolerance over the operating temperature range of -40C to 85C and can provide output voltages from 0.8V up to 10V. This makes the chip suitable for powering audio systems, analog tuners and CD/DVD players in automobiles. Each output can deliver up to 20A of current at efficiencies as high as 95 percent.

With its constant frequency, current mode architecture, LTC3826/-1 provides excellent line and load regulation and its two-phase operation reduces input capacitance requirements. The device smoothly ramps each output voltage during startup using separate adjustable soft-start and tracking pins. It operates at a selectable frequency between 250-550kHz and can be synchronized to an external clock from 140kHz to 650kHz using its PLL. Moreover, the user can select from Burst Mode Operation, pulse skipping and continuous operation at light loads. There are two versions offered: LTC3826 is the fully featured part with additional functions that include a clock out, phase modulation, two separate power good signals and a current limit foldback disable capability.

LTC3826 is offered in 32-lead 5mm x 5mm QFN package, whereas the LTC3826-1 is housed in the 28-pin SSOP. Pricing for both parts in 1,000-piece quantities starts at $5.38 each.

Article Comments - Ultralow-current DC/DC controller su...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top