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LM2991

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1-A, negative, adjustable low-dropout voltage regulator with enable

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Data sheet

LM2991

ACTIVE
Data sheet Order now

Product details

Output options Adjustable Output Iout (max) (A) 1 Vin (max) (V) 0.3 Vin (min) (V) -26 Vout (max) (V) -3 Vout (min) (V) -24 Rating Catalog Noise (µVrms) 200 PSRR at 100 KHz (dB) 22 Iq (typ) (mA) 0.7 Thermal resistance θJA (°C/W) 28 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features Enable Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 600 Operating temperature range (°C) -40 to 125
Output options Adjustable Output Iout (max) (A) 1 Vin (max) (V) 0.3 Vin (min) (V) -26 Vout (max) (V) -3 Vout (min) (V) -24 Rating Catalog Noise (µVrms) 200 PSRR at 100 KHz (dB) 22 Iq (typ) (mA) 0.7 Thermal resistance θJA (°C/W) 28 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features Enable Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 600 Operating temperature range (°C) -40 to 125
TO-220 (KC) 5 45.212 mm² 10.16 x 4.45 TO-220 (NDH) 5 86.0552 mm² 10.16 x 8.47 TO-263 (KTT) 5 154.8384 mm² 10.16 x 15.24
  • Output Voltage Adjustable from −3 V to −24 V, Typically −2 V to −25 V
  • Output Current in Excess of 1 A
  • Dropout Voltage Typically 0.6 V at 1-A Load
  • Low Quiescent Current
  • Internal Short Circuit Current Limit
  • Internal Thermal Shutdown With Hysteresis
  • TTL, CMOS Compatible ON/OFF Switch
  • Functional Complement to the LM2941 Series
  • Output Voltage Adjustable from −3 V to −24 V, Typically −2 V to −25 V
  • Output Current in Excess of 1 A
  • Dropout Voltage Typically 0.6 V at 1-A Load
  • Low Quiescent Current
  • Internal Short Circuit Current Limit
  • Internal Thermal Shutdown With Hysteresis
  • TTL, CMOS Compatible ON/OFF Switch
  • Functional Complement to the LM2941 Series

The LM2991 is a low dropout adjustable negative regulator with a output voltage range between −3 V to −24 V. The LM2991 provides up to 1 A of load current and features a ON /OFF pin for remote shutdown capability.

The LM2991 uses new circuit design techniques to provide a low dropout voltage, low quiescent current and low temperature coefficient precision reference. The dropout voltage at 1-A load current is typically 0.6 V and an ensured worst-case maximum of 1 V over the entire operating temperature range. The quiescent current is typically 1 mA with a 1-A load current and an input-output voltage differential greater than 3 V. A unique circuit design of the internal bias supply limits the quiescent current to only 9 mA (typical) when the regulator is in the dropout mode (VOUT − VIN ≤ 3 V).

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.

The LM2991 is a low dropout adjustable negative regulator with a output voltage range between −3 V to −24 V. The LM2991 provides up to 1 A of load current and features a ON /OFF pin for remote shutdown capability.

The LM2991 uses new circuit design techniques to provide a low dropout voltage, low quiescent current and low temperature coefficient precision reference. The dropout voltage at 1-A load current is typically 0.6 V and an ensured worst-case maximum of 1 V over the entire operating temperature range. The quiescent current is typically 1 mA with a 1-A load current and an input-output voltage differential greater than 3 V. A unique circuit design of the internal bias supply limits the quiescent current to only 9 mA (typical) when the regulator is in the dropout mode (VOUT − VIN ≤ 3 V).

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.
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Technical documentation

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* Data sheet LM2991 Negative Low-Dropout Adjustable Regulator datasheet (Rev. I) PDF | HTML 03 Oct 2016
More literature Die D/S LM2991 MD8 MCD2730A Negative Low Dropout Adjustable Regulator 20 Dec 2012
More literature Die D/S LM2991 MDC Negative Low Dropout Adj Regulator 20 Sep 2012
Application note Linear and Switching Voltage Regulator Fundamental Part 1 21 Mar 2007

Design & development

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Package Pins CAD symbols, footprints & 3D models
TO-220 (KC) 5 Ultra Librarian
TO-220 (NDH) 5 Ultra Librarian
TO-263 (KTT) 5 Ultra Librarian
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