SIMPLE SWITCHER® Step-Down Regulators, LM557x & LM2557x Series The LM557x and LM2557x are easy to use high-performance SIMPLE SWITCHER® buck regulators which allow design engineers to design and optimize a robust power supply using a minimum set of components. Integrated N-channel MOSFET
Ultra-Wide Input Voltage Range up to 42V/75V
Emulated current mode for fast transient response
Adjustable Output Voltage as Low as 1.225V
1.5% Feedback Reference Accuracy
Operating frequency adjustable between 50kHz and 500kHz with single resistor
Adjustable soft-start