uA78S40 datasheet,pdf,Universal Switching Regulator Subsystem

The mA78S40 is a switching regulator subsystem, consisting of a
temperature compensated voltage reference, controlled–duty cycle
oscillator with an active current limit circuit, comparator, high–current
and high–voltage output switch, capable of 1.5 A and 40 V, pinned–out
power diode and an uncommitted operational amplifier, which can be
powered up or down independent of the IC supply. The switching
output can drive external NPN or PNP transistors when voltages
greater the 40 V, or currents in excess of 1.5 A, are required. Some of
the features are wide–supply voltage range, low standby current, high
efficiency and low drift. The? mA78S40 is available in commercial
(0° to + 70°C), and automotive (–40° to + 85°C) temperature ranges.