The LM78S40 is a monolithic regulator subsystem consistingof all the active building blocks necessary for switching regulatorsystems. The device consists of a temperature compensatedvoltage reference, a duty-cycle controllable oscillatorwith an active current limit circuit, an error amplifier, highcurrent, high voltage output switch, a power diode and anuncommitted operational amplifier. The device can drive externalNPN or PNP transistors when currents in excess of1.5A or voltages in excess of 40V are required. The devicecan be used for step-down, step-up or inverting switchingregulators as well as for series pass regulators. It featureswide supply voltage range, low standby power dissipation,high efficiency and low drift. It is useful for any stand-alone,low part count switching system and works extremely well inbattery operated systems.
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