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

Inventory: 5,920

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Packaging information

Package | Pins TO-220 (KC) | 5
Operating temperature range (°C) Q (-40 to 125)
Package qty | Carrier: 45 | TUBE
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Quality information

RoHS Exempt
REACH Affected
Lead finish / Ball material SN
MSL rating / Peak reflow Level-1-NA-UNLIM
Material content View
DPPM / MTBF / Fit rate View
Qualification summary View
Ongoing reliability monitoring View
Device marking View


  • 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

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

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

The LM2991 is short-circuit proof, and thermal shutdown includes hysteresis to enhancethe reliability of the device when inadvertently overloaded for extended periods. The LM2991 isavailable in 5-lead TO-220 and DDPAK/TO-263 packages and is rated for operation over the automotivetemperature range of −40°C to +125°C. Mil-Aero versions are also available.

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100-249 $2.27
250-999 $1.59
1,000+ $1.28