General Description
●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 (VOUT − VIN ≤ 3V).
●Features
●■ 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
●Applications
●■ Post switcher regulator
●■ Local, on-card, regulation
●■ Battery operated equipment
