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LM2940CSX-15 데이터시트(PDF) 1 Page - Texas Instruments |
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LM2940CSX-15 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 37 page VIN Unregulated Input VOUT Regulated Output C1* 0.47 µF COUT** 22 µF LM2940 IQ + IN OUT Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2940-N, LM2940C SNVS769J – MARCH 2000 – REVISED DECEMBER 2014 LM2940x 1-A Low Dropout Regulator 1 Features 3 Description The LM2940-N and LM2940C positive voltage 1 • Input Voltage Range = 6 V to 26 V regulators feature the ability to source 1 A of output • Dropout Voltage Typically 0.5 V at IOUT = 1 A current with a dropout voltage of typically 0.5 V and a • Output Current in Excess of 1 A maximum of 1 V over the entire temperature range. Furthermore, a quiescent current reduction circuit has • Output Voltage Trimmed Before Assembly been included which reduces the ground current • Reverse Battery Protection when the differential between the input voltage and • Internal Short Circuit Current Limit the output voltage exceeds approximately 3 V. The quiescent current with 1 A of output current and an • Mirror Image Insertion Protection input-output differential of 5 V is therefore only 30 • P+ Product Enhancement Tested mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN − VOUT ≤ 3 V). 2 Applications Designed also for vehicular applications, the LM2940- • Post Regulator for Switching Supplies N and LM2940C and all regulated circuitry are • Logic Power Supplies protected from reverse battery installations or 2- • Industrial Instrumentation battery jumps. During line transients, such as load dump when the input voltage can momentarily space exceed the specified maximum operating voltage, the space regulator will automatically shut down to protect both space the internal circuits and the load. The LM2940-N and LM2940C cannot be harmed by temporary mirror- image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) SOT-223 (4) 6.50 mm x 3.50 mm WSON (8) 4.00 mm x 4.00 mm LM2940-N TO-263 (3) 10.18 mm x 8.41 mm TO-220 (3) 14.986 mm x 10.16 mm TO-263 (3) 10.18 mm x 8.41 mm LM2940C TO-220 (3) 14.986 mm x 10.16 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. Simplified Schematic *Required if regulator is located far from power supply filter. **COUT must be at least 22 μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve. 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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