MAX1818

19-1860; Rev 1; 3/01 500mA Low-Dropout Linear Regulator in SOT23 General Description The MAX1818 low-dropout linear regulator operates from a +2.5V to +5.5V supply and delivers a guaranteed 500mA load current with low 120mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see Selector Guide) or can be adjusted from 1.25V to 5.0V with an external resistive divider. An internal PMOS pass transistor allows the low 125µA supply current to remain independent of load, making this device ideal for portable battery-operated equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, base stations, and notebook computers. Other features include an active-low open-drain reset output that indicates when the output is out of regulation, a 0.1µA shutdown, short-circuit protection, and thermal shutdown protection. The device is available in a miniature 800mW 6-pin SOT23 package. o Guaranteed 500mA Output Current o Low 120mV Dropout at 500mA o ±1% Output Voltage Accuracy Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V, 5V Adjustable from 1.25V to 5.0V o Power OK Output o Low 125µA Ground Current o 0.1µA Shutdown Current o Thermal Overload Protection o Output Current Limit o Tiny 800mW 6-Pin SOT23 Package Features MAX1818 Ordering Information PART* MAX1818EUAT_ _ TEMP RANGE -40°C to +85°C PIN-PACKAGE 6 SOT23-6 Applications Notebook Computers Cellular and Cordless Telephones Personal Digital Assistants (PDAs) Palmtop Computers...