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