LT1071

The LT1071 is a kind of monolithic high power switching regulators which can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and "Cuk". A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry using adaptive antisat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50A typical for standby operation. Totally isolated and regulated outputs can be generated by using the optional "flyback regulation mode" built into the LT1071, without the need for optocouplers or extra transformer windings. Integration of all functions allows the device to be built in a standard 5-pin TO-3 or T0-220 power package. This makes it extremely easy to use and provides "bust proof" operation similar to that obtained with 3-pin linear regulators. The LT1071 operate with supply voltages from 3V to 60V, and draw only 6mA quiescent current. It can deliver load power up to 100W with no external power devices. By utilizing current mode switching techniques, they provide excellent AC and DC load and line regulation. The device have many unique features not found even on the vastly more difficult to use low power control chips presently available.

The features can be summarized as (1)wide input voltage range: 3V to 60V; (2)low quiescent current: 6mA; (3)internal 5A switch (2.5A for LT1071); (4)very few external parts required; (5)self protected against overloads; (6)operates inearly all switching topologies; (7)shutdowmode draws only 50A supply current; (8)flyback regulated mode has fully floating outputs; (9)comes istandard 5-PiPackages; (10)cabe externally synchronized (consult factory).

The absolute maximum ratings of LT1071 are (1)supply voltage LT1070/LT1071: 40V; (2)switch output voltage: 65V; (3)feedback pin voltage (transient, 1ms): ±15V; (4)operating junction temperature range commercial (operating): 0°C to 100°C, commercial (short circuit): 0°C to 125°C, industrial: 40°C to 125°C, military: 55°C to 150°C; (5)storage temperature range: 65°C to 150°C; (6)lead temperature (soldering, 10 sec): 300°C.