LM78S40 Datasheet | National Semiconductor

Description The LM78S40 is a monolithic regulator subsystem consisting of all the active building blocks necessary for switching regulator systems. The device consists of a temperature pensated voltage reference, a duty-cycle controllable oscillator with an active current limit circuit, an error amplifier, high current, high voltage output switch, a power diode and an unmitted operational amplifier. The device can drive external NPN or PNP transistors when currents in excess of 1.5A or voltages in excess of 40V are required. The device can be used for step-down, step-up or inverting switching regulators as well as for series pass regulators. It features wide 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 in battery operated systems. Features n n n n n n n n Step-up, step-down or inverting switching regulators Output adjustable from 1.25V to 40V Peak currents to 1.5A without external transistors Operation from 2.5V to 40V input Low standby current drain 80 d B line and load regulation High gain, high current, independent op amp Pulse width modulation with no double pulsing Block and Connection Diagrams DS010057-2 16-Lead DIP DS010057-1 Top View © 1998 National Semiconductor Corporation DS010057 .national. Ordering Information Part Number LM78S40J/883 LM78S40N LM78S40CN NS Package J16A Ceramic DIP N16E Molded DIP N16E Molded DIP Temperature Range - 55˚C to +125˚C - 40˚C to +125˚C 0˚C to +70˚C .national. Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Ceramic DIP Molded DIP Operating Temperature Range Extended (LM78S40J) Industrial (LM78S40N) mercial (LM78S40CN) Lead Temperature Ceramic DIP (Soldering, 60 sec.) Molded DIP (Soldering, 10 sec.) Internal Power...