ZHCSFE3B March 2016 – November 2017 LM5161
PRODUCTION DATA.
The LM5161 step-down switching regulator features all the functions needed to implement a low-cost, efficient buck converter capable of supplying 1-A to the load. This high voltage regulator contains 100-V N-channel buck and synchronous rectifier switches and is available in the 14-pin HTSSOP package. The regulator operation is based on constant ON-time control where the ON-time is inversely proportional to input voltage VIN. This feature maintains a relatively constant operating frequency with load and input voltage variations. A constant on-time switching regulator requires no loop compensation resulting in fast load transient response. Peak current limit detection circuit is implemented with a forced OFF-time during current limiting which is inversely proportional to voltage at the feedback pin, VFB and directly proportional to VIN. Varying the current limit OFF-time with VFB and VIN ensures short circuit protection with minimal current limit foldback. The LM5161 can be applied in numerous end equipment systems requiring efficient step-down regulation from higher input voltages. This regulator is well suited for 24 V industrial systems as well as for 48 V telecom and PoE voltage ranges. The LM5161 integrates an under-voltage lockout (EN/UVLO) circuit to prevent faulty operation of the device at low input voltages and features intelligent current limit and thermal shutdown to protect the device during overload or short circuit.