The LM25018 device is a 48-V, 325-mA synchronous step-down regulator with integrated
high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25018
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
The LM25018 device is available in WSON-8 and SO Power PAD-8 plastic packages.
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