LT1270 Datasheet | Linear Technology

LT1270A/LT1270 8A and 10A High Efficiency Switching Regulators Features s Wide Input Voltage Range: 3.5V to 30V s Low Quiescent Current: 7m A s Internal 8A Switch (10A for LT1270A) s Very Few External Parts Required s Self-Protected Against Overloads s Shutdown Mode Draws Only 100µA Supply Current s Flyback-Regulated Mode Has Fully Floating Outputs s Can be Externally Synchronized (See LT1072 Data Sheet) s es in Standard 5-Pin TO-220 Package U APPLICATIO S s High Efficiency Buck Converter s PC Power Supply with Multiple Outputs s Battery Upconverter s Negative-to-Positive Converter USER NOTE: This data sheet is only intended to provide specifications, graphs and a general functional description of the LT1270A/LT1270. Application circuits are included to show the capability of the LT1270A/LT1270. A plete design manual (AN-19) should be obtained to assist in developing new designs. AN-19 contains a prehensive discussion of both the LT1070 and the external ponents used with it, as well as plete formulas for calculating the values of these ponents. AN-19 can also be used for the LT1270A/LT1270 by factoring in the higher switch current rating and higher operating frequency. A prehensive CAD program called Switcher Cad is also available. Contact the local sales office in your area or the factory direct. DESCRIPTIO The LT1270A/LT1270 are monolithic high power switching regulators. Identical to the popular LT1070, except for switching frequency (60k 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 LT1270A/LT1270 to be built in a standard TO-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...