Wide Input Voltage Step-Down Controller from Linear Draws Only 40uA

1st February 2007
ES Admin
Linear Technology has introduced the LTC3824, a 4V to 60V input range, 100% duty cycle, low IQ, adjustable switching frequency DC/DC current mode controller. This controller is ideal for automotive applications where the 4V minimum input voltage supports cold cranking and the 60V maximum input voltage survives inductive load dumps, without the need for external clamping circuits.
The LTC3824 can be configured for Burst Mode operation which significantly improves light load efficiency especially during system standby, where the quiescent current is reduced to 40uA. Typical shutdown current is 25uA.

The LTC3824 provides step-down solutions for applications that cover a broad range of inputs, from battery powered instruments to automotive applications. The LTC3824 drives an external P-channel MOSFET and can operate at 100% duty cycle for the lowest possible dropout voltage, allowing VOUT to approach VIN. Its current mode architecture provides fast line and load transient response as well as cycle-by-cycle overcurrent protection. Additional features include short-circuit protection, adjustable soft-start and overvoltage protection. The LTC3824 can be programmed to a fixed frequency from 100kHz to 600kHz or for noise sensitive requirements, can be synchronized to an external clock over the same range. In addition, the output voltage can be adjusted over a wide range from 0.8V to VIN.

The LTC3824 is offered in a 10-pin thermally enhanced MSOP package. The operating temperature for the LTC3824EMSE is -40°C to 85°C and for the LTC3824IMSE is -40°C to 125°C. 1,000-piece price starts at $1.95 each.

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