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.