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LM2990 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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LM2990 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 24 page Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2990 SNVS093G – JUNE 1999 – REVISED MAY 2015 LM2990 Negative Low-Dropout Regulator 1 Features 3 Description The LM2990 is a three-terminal, low-dropout, 1-A 1 • Input Voltage: –26 V to –6 V negative voltage regulator available with fixed output • Fixed Output Voltages: −5 V, −5.2 V, −12 V, and voltages of −5 V, −5.2 V, −12 V, and −15 V. −15 V The LM2990 uses circuit design techniques to • 5% Output Accuracy over Entire Operating Range provide low-dropout and low-quiescent current. The • Output Current in Excess of 1 A dropout voltage at 1-A load current is typically 0.6 V • Dropout Voltage Typically 0.6 V at 1-A Load and an ensured worst-case maximum of 1 V over the entire operating temperature range. The quiescent • Low Quiescent Current current is typically 1 mA with 1-A load current and an • Internal Short-Circuit Current Limit input-output voltage differential greater than 3 V. A • Internal Thermal Shutdown with Hysteresis unique circuit design of the internal bias supply limits the quiescent current to only 9 mA (typical) when the • Functional Complement to the LM2940 Series regulator is in the dropout mode (VOUT − VIN ≤ 3 V). Output voltage accuracy is ensured to ±5% over load 2 Applications and temperature extremes. • Post Switcher Regulator The LM2990 also implements short-circuit proof, and • Local, On-Card Regulation thermal shutdown includes hysteresis to enhance the • Battery Operated Equipment reliability of the device when overloaded for an extended period of time. space space All these features make the LM2990 an ideal negative power supply suited for dual supply space systems. The device may also be used as fixed or adjustable current sink load. Typical Application The LM2990 is available in two 3-pin packages and is rated for operation over the junction temperature range of −40°C to 125°C. Device Information(1) * and **: Required for stability. Must be at PART NUMBER PACKAGE BODY SIZE (NOM) least a 10- μF aluminum electrolytic or a 1- DDPAK/TO-263 (3) 10.20 mm x 9.00 mm μF solid tantalum to maintain stability. May LM2990 TO-220 (3) 14.99 mm x 10.16 mm be increased without bound to maintain regulation during transients. Locate the (1) For all available packages, see the orderable addendum at capacitor as close as possible to the the end of the datasheet. regulator. The equivalent series resistance (ESR) is critical, and should be less than 10 Ω over the same operating temperature range as the regulator. 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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