LT1268 Datasheet | Linear Technology

LT1268B/LT1268 7.5A, 150k Hz Switching Regulators Features s s s s s s DESCRIPTIO s Wide Input Voltage Range: 3.5V to 30V Low Quiescent Current: 7m A Internal 7.5A Switch Very Few External Parts Required Self-Protected Against Overloads Available in Standard and Surface Mount 5-Pin Packages Can Be Externally Synchronized (See LT1072 Data Sheet) APPLICATI s s s s High Efficiency Boost Converter PC Power Supply with Multiple Outputs Battery Upconverter Negative-to-Positive Converter The LT1268B and LT1268 are monolithic high power switching regulators. Identical to the popular LT1070, except for switching frequency (150k Hz) and higher switch current, they can be operated in all standard switching configurations including buck, boost, flyback, and inverting. A high current, high efficiency switch is included on the die along with all oscillator, control, and protection circuitry. Integration of all functions allows the LT1268 to be built in standard 5-pin power packages. This makes it extremely easy to use and provides “bust proof” operations similar to that obtained with 3-pin linear regulators. The LT1268 operate with supply voltages from 3.5V to 30V and draw only 7m A quiescent current. By utilizing current mode switching techniques, it provides excellent AC and DC load and line regulation. The LT1268 use an adaptive anti-sat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 100µA typical for standby operation. USER NOTE: This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1268B/LT1268. Application circuits are included to show the capability of the LT1268B/LT1268. A plete design manual (AN19) should be obtained to assist in developing new designs. This manual contains a prehensive discussion of both the LT1070 and the external ponents used with it, as well as plete formulas for...