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General Description

The MAX8865 and MAX8866 dual, low-dropout linear regulators operate from a +2.5V to +5.5V input range and deliver up to 100mA. At 200mA total load, the PMOS pass transistors keep the supply current at 145μA, making these devices ideal for battery-operated portable equipment such as cellular phones, cordless phones, and modems.

The devices feature Dual Mode? operation: their output voltages are preset (at 3.15V for the “T” versions, 2.84V for the “S” versions, or 2.80V for the “R” versions) or can be adjusted with external resistor dividers. Other features include independent low-power shutdown, short-circuit protection, thermal shutdown protection, and reverse battery protection. The MAX8866 also includes an auto-discharge function, which actively dis charges the selected output voltage to ground when the device is placed in shutdown mode. Both devices come in a miniature 8-pin μMAX package.

Features

? Low Cost

? Low, 55mV Dropout Voltage @ 50mA IOUT

? Low, 105μA No-Load Supply Current

? Low, 145μA Operating Supply Current (even in dropout)

? Low, 350μVRMS Output Noise

? Independent, Low-Current Shutdown Control

? Thermal Overload Protection

? Output Current Limit

? Reverse Battery Protection

? Dual Mode Operation: Fixed or Adjustable (1.25V to 5.5V) Outputs

Applications

?? Cordless Telephones

?? Modems

?? PCS Telephones

?? Hand-Held Instruments

?? Cellular Telephones

?? Palmtop Computers

?? PCMCIA Cards

?? Electronic Planners