The LM25017 device is a 48-V, 650-mA synchronous step-down regulator with integratedhigh-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25017device requires no loop compensation, provides excellent transient response, and enables very highstep-down ratios. The on-time varies inversely with the input voltage resulting in nearly constantfrequency over the input voltage range. A high voltage startup regulator provides bias power forinternal operation of the IC and for integrated gate drivers.
A peak current limit circuit protects against overload conditions. The undervoltagelockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independentlyprogrammed. 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.