Buck Regulator with High-Frequency Control Circuitry

National Semiconductor Corp.’s new LM5010 is a 75-V buck regulator with all the functions needed to implement an efficient power management solution capable of supplying in excess of 1-A current. The LM5010 complements National’s LM5007, a 75- V, 0.5-A buck regulator, and integrates unique high-frequency control circuitry that enables designers to use the regulator with smaller filters and fewer external components.

Key features include input voltage range of 8 V to 75 V; valley-current limit at 1.25 A typical; integrated 80-V, n-channel buck switch; integrated startup regulator; integrated current sense resistor; constant on-time control with voltage feed-forward; no loop compensation required; ultrafast transient response, typically 5 µs; adjustable switching frequency up to 1 MHz; operating frequency that remains virtually constant with load and line variations; precision 2.5-V feedback reference.

In addition, it features adjustable output voltage from 2.5 V to Vin-2 V; adjustable soft-start limits current surges and voltage overshoot during start-up, and thermal shutdown protection. The LM5010 is available in a 4-mm x 4-mm LLP or TSSOP package.

For more information, visit www.national.com.