Advantest LM2991S - Negative Low Dropout Adjustable Regulator - National Semiconductor free download

File name LM2991S - Negative Low Dropout Adjustable Regulator - National Semiconductor.pdf

LM2991 Negative Low Dropout Adjustable Regulator September 2000 LM2991 Negative Low Dropout Adjustable Regulator General Description Features The LM2991 is a low dropout adjustable negative regulator n Output voltage adjustable from -3V to -24V, typically with a output voltage range between -3V to -24V. The -2V to -25V LM2991 provides up to 1A of load current and features a On n Output current in excess of 1A /Off pin for remote shutdown capability. n Dropout voltage typically 0.6V at 1A load The LM2991 uses new circuit design techniques to provide a n Low quiescent current low dropout voltage, low quiescent current and low tempera- n Internal short circuit current limit ture coefficient precision reference. The dropout voltage at n Internal thermal shutdown with hysteresis 1A load current is typically 0.6V and a guaranteed n TTL, CMOS compatible ON/OFF switch worst-case maximum of 1V over the entire operating tem- n Functional complement to the LM2941 series perature 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 Applications supply limits the quiescent current to only 9 mA (typical) n Post switcher regulator when the regulator is in the dropout mode (VOUT - VIN 3V). n Local, on-card, regulation The LM2991 is short-circuit proof, and thermal shutdown in- n Battery operated equipment cludes 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