Linear Unveils H-Grade DC/DC Controller

Linear Technology has announced the H-grade version of the LTC3824, a 4V to 60V input range, low quiescent current step-down DC/DC controller in a small thermally enhanced MSOP-10 package. This H-grade device is guaranteed up to a 150C operating junction temperature range and is suitable for automotive and industrial applications subjected to high ambient temperatures, demanding a small solution size for output voltages ranging from 0.8V to Vin at up to 5A.

The device's 4V minimum input voltage supports automotive cold crank and the 60V maximum input voltage survives inductive load dumps without the need for external clamping circuits. The LTC3824H can be configured for Burst Mode operation, which reduces the controller's no-load current draw to only 40uA and safely powers pre-biased loads. The shutdown current is 7uA. With 100 per cent duty cycle capability, the LTC3824H has a very low dropout voltage, allowing Vout to approach Vin, a feature that extends the run time in battery-powered applications.

In addition, the LTC3824H can be programmed to a fixed frequency from 100kHz to 600kHz. For noise-sensitive applications, the device can be synchronised to an external clock over the same range. Its onboard Mosfet gate driver powers an external P-channel Mosfet to produce greater than 90 per cent conversion efficiency. The LTC3824H's current mode architecture provides fast line and load transient response as well as cycle-by-cycle over-current protection. Additional features include programmable current limit and soft-start, along with over-voltage protection. The LTC3824H operates and is guaranteed over an operating junction temperature range of -40C to 150C.

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