The MAX1615/MAX1616 are micropower, SOT23-5 linear regulators that supply always-on, keep-alive power to CMOS RAM and microcontrollers (μCs) in systems with high-voltage batteries. Key features include wide input voltage range, low dropout voltage, and low quiescent supply current. Despite a miserly 8μA (max) no-load supply current, the MAX1615/MAX1616 have excellent line-transient response and AC power-supply rejection ratio. They provide a clean, fixed 5V or 3.3V output (MAX1615) or an adjustable 1.24V to 28V output (MAX1616), even when subjected to fast supply-voltage changes that occur during the switchover from battery to AC adapter input power. The space-saving SOT23-5 package has excellent thermal characteristics and tolerates up to 571mW of power dissipation. Fault protection is provided by internal foldback current limiting and thermal-shutdown circuitry. The MAX1615/MAX1616 are now available in lead-free packages. 
  
 
Feature
 
 
  
  -  4V to 28V Input Range 
 
  -  8μA (max) Quiescent Supply Current 
 
  -  <1μA Shutdown Supply Current 
 
  -  3.3V or 5V, Pin-Selectable Output (MAX1615) Adjustable 1.24V to 28V Output (MAX1616) 
 
  -  30mA Output Current 
 
  -  ±2% Initial Output Accuracy 
 
  -  Thermal-Overload Protection 
 
  -  5-Pin SOT23 Package 
 
  -  Low Cost 
 
 
 
  
Applications
 
 
 
  - Battery-Powered Systems
 
  - CMOS/RTC Backup Power
 
  - Microcontroller Power
 
  - Notebook Computers
 
  - PDAs and Handy-Terminals
 
  - Smart Battery Packs/Chargers