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DC/DC controller draws only 170A

Posted: 27 Jul 2009     Print Version  Bookmark and Share

Keywords:DC/DC controller  MOSFET  communications 

Linear Technology Corp. has released a new DC/DC controller targeted for powering high performance systems including navigation, audio, communications, CD/DVD players and disc drives.

The LTC3858/-1, a low quiescent current, 2-phase dual output synchronous step-down DC/DC controller that draws only 170µA with one output active and only 300µA when both outputs are active. With both outputs shut down, the controller draws only 8µA. It has a wide input supply range of 4V to 38V that protects against automotive wide input voltage transients commonly found during load dump and cold crank conditions and to cover a broad range of battery chemistries. Each output can be set from 0.8V to 24V at output currents up to 20A with efficiency as high as 95 per cent.

The LTC3858/-1 has powerful 1.1Ω on-board MOSFET gate drivers and operates with an adjustable fixed frequency between 50kHz and 900kHz, or can be synchronised to an external clock from 75kHz to 850kHz using its PLL. The user can select from continuous operation, pulse skipping and low ripple Burst Mode operation during light loads. The part safely powers pre-biased loads.

In addition, the controllers' two-phase operation reduces input capacitance requirements, while the current mode architecture provides easy loop compensation and fast transient response. Both outputs have adjustable soft-start to control the turn-on time and the output overload protection feature latches off the converter until the input voltage is recycled. The LTC3858/-1 also features a tight ±1 per cent reference voltage accuracy over the operating temperature range of -40°C to 85°C. The LTC3858 is the fully featured part with additional functions beyond the LTC3858-1 including a clock out, clock phase modulation, two separate power good signals and adjustable current limit.

The LTC3858 is offered in a 32-lead 5mm x 5mm QFN package, with the LTC3858-1 in 28-pin SSOP or 4mm x 5mm QFN-28 packages. Pricing starts at Rs.215.75 ($4.47) in 1,000-piece quantities.

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