MAX1615

19-1225; Rev 2; 1/98 High-Voltage, Low-Power Linear Regulators for Notebook Computers ________________General Description 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 thermalshutdown circuitry. ____________________________Features o 4V to 28V Input Range o 8µA (max) Quiescent Supply Current o <1µA Shutdown Supply Current o 3.3V or 5V, Pin-Selectable Output (MAX1615) Adjustable 1.24V to 28V Output (MAX1616) o 30mA Output Current o ±2% Initial Output Accuracy o Thermal-Overload Protection o 5-Pin SOT23 Package o Low Cost MAX1615/MAX1616 ________________________Applications CMOS/RTC Backup Power Microcontroller Power Notebook Computers Smart-Battery Packs PDAs and Handy-Terminals Batter...