DC/DC controller for infotainment

  • 18-Aug-2009 11:56 EDT

The low-quiescent current LTC3858/-1 from Linear Technology is a two-phase dual-output synchronous step-down dc/dc controller that draws 170 µA with one output active and 300 µA when both outputs are active. Suitable for automotive applications, the LTC3858/-1 draws 8 µA with both outputs shut down. With a wide input supply range of 4 to 38 V, the LTC3858/-1 protects against automotive-wide input voltage transients, which are commonly found during load-dump and cold-crank conditions, as well as covers a broad range of battery chemistries. Each output can be set from 0.8 to 24 V at output currents up to 20 A with efficiency as high as 95%. The LTC3858/-1 has 1.1-ohm onboard MOSFET gate drivers and operates with an adjustable fixed frequency between 50 and 900 kHz. The controller is suitable for powering high-performance systems including navigation, audio, and communications.

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