描述The LM2991 is a low dropout adjustable negative regulator with a output voltage range between −2V to −25V. The LM2991 providesup 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 temperaturecoefficient precision reference. The dropout voltage at 1A load current is typically 0.6V and a guaranteed worst-case maximumof 1V over the entire operating temperature range. The quiescent current is typically 1 mA with a 1A load current and an input-outputvoltage differential greater than 3V. A unique circuit design of the internal bias supply limits the quiescent current toonly 9 mA (typical) when the regulator is in the dropout mode (VO − VI≤ 3V).The LM2991 is short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device wheninadvertently overloaded for extended periods.特性 Output voltage adjustable from −2V to −25VOutput current in excess of 1ADropout voltage typically 0.6V at 1A loadLow quiescent currentInternal short circuit current limitInternal thermal shutdown with hysteresisTTL, CMOS compatible^ON/OFF switchFunctional complement to the LM2941 series