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LT1270 Datasheet(PDF) 1 Page - Linear Technology |
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LT1270 Datasheet(HTML) 1 Page - Linear Technology |
1 / 4 page 1 LT1270A/LT1270 1270afc DESCRIPTIO TYPICAL APPLICATIO APPLICATIO S FEATURES 8A and 10A High Efficiency Switching Regulators s Wide Input Voltage Range: 3.5V to 30V s Low Quiescent Current: 7mA s Internal 8A Switch (10A for LT1270A) s Very Few External Parts Required s Self-Protected Against Overloads s Shutdown Mode Draws Only 100 µA Supply Current s Flyback-Regulated Mode Has Fully Floating Outputs s Can be Externally Synchronized (See LT1072 Data Sheet) s Comes in Standard 5-Pin TO-220 Package The LT1270A/LT1270 are monolithic high power switch- ing regulators. Identical to the popular LT1070, except for switching frequency (60kHz) and higher switch current, they can be operated in all standard switching configura- tions 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. Inte- gration 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 LT1270A/LT1270 operate with supply voltages from 3.5V to 30V, and draw only 7mA quiescent current. By utilizing current-mode switching techniques, they provide excellent AC and DC load and line regulation. The LT1270A/LT1270 use adaptive anti-sat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode re- duces total supply current to 100 µA typical for standby operation. 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 complete design manual (AN-19) should be obtained to assist in developing new designs. AN-19 contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. AN-19 can also be used for the LT1270A/LT1270 by factoring in the higher switch current rating and higher operating frequency. A comprehensive CAD program called SwitcherCad is also available. Contact the local sales office in your area or the factory direct. VSW VIN FB VC GND MBR1035* LT1270* 0.047 µF 1k 0.047 µF 1 µF 35 µH, 8A* ANODE LT1431CZ CATHODE REF 1N4158 9.1k 10k + 470 µF 35V VIN (8V TO 25V) 2N3904 360 Ω 560 Ω 1000 µF 25V 5V* 5A + † EFFICIENCY IS ≈ 88% @ 2A, 86% @ 5A. FOR µPOWER SHUTDOWN OPTION, CONSULT FACTORY. *THESE COMPONENTS RATED CONSERVATIVELY TO IMPROVE EFFICIENCY. MAXIMUM OUTPUT CURRENT CAN BE 7A. FOR HIGH EFFICIENCY, THE INDUCTOR SHOULD BE MOLYPERMALLOY OR FERRITE. LT1270 • TA01 1N5819 High Efficiency † Buck Converter Maximum Output Power* INPUT VOLTAGE (V) 0 0 20 40 60 5 10 15 20 LT1270 • TA02 25 80 100 30 BOOST FLYBACK † BUCK-BOOST, VO = 5V (INVERTING) BUCK-BOOST, VO = 12V (INVERTING) *MULTIPLY BY 1.2 FOR LT1270A. BUCK MODE OUTPUT POWER ≈ (7.5A)(VOUT) † TRANSFORMER TURNS RATIO MUST BE OPTIMUM TO ACHIEVE FULL POWER |
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