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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