LM2990  Product Folder

The LM2990 is a three-terminal, low dropout, 1 ampere negative voltage regulator available with fixed output voltages of -5, -5.2, -12, and -15V.

The LM2990 uses new circuit design techniques to provide low dropout and low quiescent current. 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 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). Output voltage accuracy is guaranteed to ±5% over load, and temperature extremes.

The LM2990 is short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device when overloaded for an extended period of time. The LM2990 is available in a 3-lead TO-220 package and is rated for operation over the automotive temperature range of -40°C to +125°C.

• 5% output accuracy over entire operating range
• 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
• Functional complement to the LM2940 series

• Post switcher regulator
• Local, on-card, regulation
• Battery operated equipment