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LM2991T-NOPB Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM2991T-NOPB Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 19 page LM2991 www.ti.com SNVS099H – MAY 1999 – REVISED JUNE 2013 LM2991 Negative Low Dropout Adjustable Regulator Check for Samples: LM2991 1 FEATURES DESCRIPTION The LM2991 is a low dropout adjustable negative 2 • Output Voltage Adjustable from −3V to −24V, regulator with a output voltage range between −3V to Typically −2V to −25V −24V. The LM2991 provides up to 1A of load current • Output Current in Excess of 1A and features a On /Off pin for remote shutdown • Dropout Voltage Typically 0.6V at 1A Load capability. • Low Quiescent Current The LM2991 uses new circuit design techniques to provide a low dropout voltage, low quiescent current • Internal Short Circuit Current Limit and low temperature coefficient precision reference. • Internal Thermal Shutdown with Hysteresis The dropout voltage at 1A load current is typically • TTL, CMOS Compatible ON/OFF Switch 0.6V and an ensured worst-case maximum of 1V • Functional Complement to the LM2941 Series over the entire operating temperature range. The quiescent current is typically 1 mA with a 1A load current and an input-output voltage differential greater APPLICATIONS than 3V. A unique circuit design of the internal bias • Post Switcher Regulator supply limits the quiescent current to only 9 mA • Local, On-Card, Regulation (typical) when the regulator is in the dropout mode (VOUT − VIN ≤ 3V). • Battery Operated Equipment The LM2991 is short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device when inadvertently overloaded for extended periods. The LM2991 is available in 5- lead TO-220 and DDPAK/TO-263 packages and is rated for operation over the automotive temperature range of −40°C to +125°C. Mil-Aero versions are also available. Typical Application VOUT = VREF (1 + R2/R1) *Required if the regulator is located further than 6 inches from the power supply filter capacitors. A 1 μF solid tantalum or a 10 μF aluminum electrolytic capacitor is recommended. **Required for stability. Must be at least a 10 μF aluminum electrolytic or a 1 μF solid tantalum to maintain stability. May be increased without bound to maintain regulation during transients. Locate the capacitor as close as possible to the 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 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1999–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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