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LT1070IK Datasheet(PDF) 1 Page - Linear Technology |
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LT1070IK Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 10701fe 1 LT1070/LT1071 FEATURES APPLICATIO S DESCRIPTIO TYPICAL APPLICATIO 5A and 2.5A High Efficiency Switching Regulators s Wide Input Voltage Range: 3V to 60V s Low Quiescent Current: 6mA s Internal 5A Switch (2.5A for LT1071) s Very Few External Parts Required s Self Protected Against Overloads s Operates in Nearly All Switching Topologies s Shutdown Mode Draws Only 50 µA Supply Current s Flyback Regulated Mode Has Fully Floating Outputs s Comes in Standard 5-Pin TO-220 Package s Can be Externally Synchronized (Consult Factory) The LT ®1070/LT1071 are monolithic high power switch- ing regulators. They can be operated in all standard switch- ing configurations including buck, boost, flyback, for- ward, inverting and “Cuk”. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. Integration of all func- tions allows the LT1070/LT1071 to be built in a standard 5-pin 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 LT1070/LT1071 operate with supply voltages 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 switching techniques, they provide excellent AC and DC load and line regulation. The LT1070/LT1071 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 currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50 µA typical for standby operation. Totally isolated and regulated outputs can be generated by using the optional “flyback regulation mode” built into the LT1070/LT1071, without the need for optocouplers or extra transformer windings. USER NOTE: This data sheet is only intended to provide specifications, graphs and a general functional description of the LT1070/LT1071. Application circuits are included to show the capability of the LT1070/LT1071. 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 LT1071 by factoring in the lower switch current rating. A second Application Note, AN25, which details off-line applications is available. + R1 10.7k 1% R2 1.24k 1% 1070/71 TA01 12V 1A R3 1k C1 1 µF C2 1000 µF + C3* 100 µF L1** 150 µH D1 5V VSW VC VIN LT1070 GND FB C3 100 µF L2 10 µH OUTPUT FILTER * ** REQUIRED IF INPUT LEADS ≥ 2" PULSE ENGINEERING 92113 INPUT VOLTAGE (V) 0 60 80 100 40 1070/71 TA02 40 20 0 10 20 30 50 BOOST BUCK/BOOST VO = 30V FLYBACK ISOLATED BUCK/BOOST VO = 5V ROUGH GUIDE ONLY. BUCK MODE POUT = 5A • VOUT. SPECIAL TOPOLOGIES DELIVER MORE POWER DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071 * ** Maximum Output Power* Boost Converter (5V to 12V) s Logic Supply 5V at 10A s 5V Logic to ±15V Op Amp Supply s Off-Line Converter Up to 200W s Battery Upconverter s Power Inverter (+ to –) or (– to +) s Fully Floating Multiple Outputs s For Lower Current Applications, See the LT1072 , LTC and LT are registered trademarks of Linear Technology Corporation. |
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