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LT1172IN8 数据表(PDF) 1 Page - Linear Technology |
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LT1172IN8 数据表(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LT1170/LT1171/LT1172 100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators s Wide Input Voltage Range: 3V to 60V s Low Quiescent Current: 6mA s Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172) s Shutdown Mode Draws Only 50 µA Supply Current s Very Few External Parts Required s Self-Protected Against Overloads s Operates in Nearly All Switching Topologies s Flyback-Regulated Mode Has Fully Floating Outputs s Comes in Standard 5-Pin Packages s LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages s Can Be Externally Synchronized The LT ®1170/LT1171/LT1172 are monolithic high power switching regulators. They can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and “Cuk.” A high current, high effi- ciency switch is included on the die along with all oscilla- tor, control and protection circuitry. Integration of all functions allows the LT1170/LT1171/LT1172 to be built in a standard 5-pin TO-3 or TO-220 power package as well as the 8-pin packages (LT1172). This makes them extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators. The LT1170/LT1171/LT1172 operate with supply volt- ages from 3V to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no external power devices. By utilizing current-mode switch- ing techniques, they provide excellent AC and DC load and line regulation. The LT1170/LT1171/LT1172 have many unique features not found even on the vastly more difficult to use low power control chips presently available. They use adaptive antisat switch drive to allow very wide ranging load cur- rents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50 µA typically for standby operation. Boost Converter (5V to 12V) Maximum Output Power* , LTC and LT are registered trademarks of Linear Technology Corporation. s Logic Supply 5V at 10A s 5V Logic to ±15V Op Amp Supply s Battery Upconverter s Power Inverter (+ to –) or (– to +) s Fully Floating Multiple Outputs USER NOTE: This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in developing new designs. This manual 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. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in the higher frequency. A CAD design program called SwitcherCAD TM is also available. SwitcherCAD is a trademark of Linear Technology Corporation. DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO 1170/1/2 TA01 D1 MBR330 C2 1000 µF C1 1 µF R1 10.7k 1% R2 1.24k 1% LT1170 GND VIN 5V R3 1k *REQUIRED IF INPUT LEADS ≥ 2" ** COILTRONICS 50-2-52 PULSE ENGINEERING 92114 VSW FB VC OUTPUT FILTER L2 10 µH L1** 50 µH C3 100 µF 12V 1A C3* 100 µF + + INPUT VOLTAGE (V) 0 100 80 60 40 20 0 40 LT1170/1/2 TA02 10 20 30 50 * ROUGH GUIDE ONLY. BUCK MODE POUT = (5A)(VOUT) SPECIAL TOPOLOGIES DELIVER MORE POWER. ** DIVIDE VERTICAL POWER SCALE BY TWO FOR LT1171, BY FOUR FOR LT1172. BOOST BUCK-BOOST VO = 30V FLYBACK BUCK-BOOST VO = 5V LT1170 |
类似零件编号 - LT1172IN8 |
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类似说明 - LT1172IN8 |
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