LM2990SX-5.0/NOPB

FEATURES

• 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

APPLICATIONS

• Post Switcher Regulator

• Local, On-Card, Regulation

• Battery Operated Equipment

DESCRIPTION

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 an ensured 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 (VOUT − VIN ≤ 3V). Output voltage accuracy is ensured 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 package and is rated for operation over the automotive temperature range of −40°C to +125°C.

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