TI LM2991T/NOPB

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 (V_OUT - V_IN ≤ 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.

• 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

• Post Switcher Regulator
• Local, On-Card, Regulation
• Battery Operated Equipment
• Industrial Instrumentation