7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator

The LM25017 device is a 48-V, 650-mA

synchronous step-down regulator with integrated high-side and low-side MOSFETs. The

constant on-time (COT) control scheme employed in the LM25017 device requires no

loop compensation, provides excellent transient response, and enables very high

step-down ratios. The on-time varies inversely with the input voltage resulting in

nearly constant frequency over the input voltage range. A high voltage startup

regulator provides bias power for internal operation of the IC and for integrated

gate drivers.

A peak current limit circuit protects

against overload conditions. The undervoltage lockout (UVLO) circuit allows the

input undervoltage threshold and hysteresis to be independently programmed. Other

protection features include thermal shutdown and bias supply undervoltage lockout

(VCC UVLO).

The LM25017 device is available in

WSON-8 and HSOP-8 plastic packages.