The internal VCC regulator also supports BIAS pin operation up to 45 V (50-V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response.
The device features a 1.5-A standard MOSFET driver and a low 100-mV current limit threshold. The device also supports the use of an external VCC supply to improve efficiency. Low operating current and pulse-skipping operation improve efficiency at light loads.
The device has built-in protection features such as cycle-by-cycle current limit, overvoltage protection, line UVLO, and thermal shutdown. Hiccup mode overload protection is available in the LM51551 device option. Additional features include low shutdown IQ, programmable soft start, programmable slope compensation, precision reference, power-good indicator, and external clock synchronization.