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75V buck regulator

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article image Contains high-frequency control circuitry.

NATIONAL Semiconductor, represented in Australia by Arrow Electronics , has released the LM5010, a 75V buck regulator with all the functions needed to implement an efficient power management system capable of supplying in excess of 1A load current.

The LM5010 complements National's LM5007 a 75V, 0.5A buck regulator, and contains high-frequency control circuitry that enable designers to use the regulator with smaller filters and fewer external components.

It has an input voltage range of 8V to 75V and a valley-current limit at 1.25A typical. It has an integrated 80V N-Channel buck switch, an integrated startup regulator, an integrated current sense resistor and a constant on-time control with voltage feed-forward.

No loop compensation is required and the system has a typical transient response time of 5μs. It has an adjustable switching frequency up to 1MHz and an operating frequency that remains virtually constant with load and line variations.

It has a 2.5V feedback reference, adjustable output voltage from 2.5V to Vin-2V and adjustable soft-start limits, current surges and voltage over-shoot during start-up. It has thermal shutdown protection and is available in a 4mm x 4mm LLP or TSSOP package.

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