Texas Instruments' LM22676 switching regulator provides all of the functions necessary to implement an efficient, high-voltage step-down (buck) regulator using a minimum of external components. This easy-to-use regulator incorporates a 42 V, N-channel MOSFET switch capable of providing up to 3 A of load current. Excellent line and load regulation, along with high efficiency (>90%), are featured. Voltage-mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available.

A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode, the regulator draws only 25 µA (typ.). Built-in soft-start (500 µs, typ.) saves external components. The LM22676 also has built in thermal shutdown, and current limiting to protect against accidental overloads.