LM2991  Product Folder

The LM2991 is a low dropout adjustable negative regulator with a output voltage range between -3V to -24V. The LM2991 provides up to 1A 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 1A load current is typically 0.6V and a guaranteed worst-case maximum of 1V over the entire operating temperature range. The quiescent current is typically 1 mA with a 1A load current and an input-output voltage differential greater than 3V. 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 < 3V).

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 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.

• Output voltage adjustable from -3V to -24V, typically -2V to -25V
• Output current in excess of 1A
• Dropout voltage typically 0.6V at 1A 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