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LM2991S - Negative Low Dropout Adjustable Regulator - National Semiconductor


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                                                                                                                                                                  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



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