The MAX8865 and MAX8866 are dual low-dropout linear regulators that operate from a +2.5V to +5.5V input range and deliver up to 100mA. These devices are ideal for battery-operated portable equipment such as cellular phones, cordless phones, and modems. They feature Dual Mode™ operation, with preset output voltages of 3.15V for the “T” versions, 2.84V for the “S” versions, or 2.80V for the “R” versions, or adjustable output voltages using 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 discharges the selected output voltage to ground when the device is placed in shutdown mode. Both devices come in a miniature 8-pin µMAX package.
The MAX8865 and MAX8866 are dual, low‑dropout linear regulators that operate from a +2.5 V to +5.5 V input range and deliver up to 100 mA per output. They feature Dual Mode™ operation with preset voltages (3.15 V for the T versions, 2.84 V for the S versions, 2.80 V for the R versions) or adjustable output via external resistor dividers. Additional functions include independent low‑power shutdown, short‑circuit protection, thermal shutdown, reverse‑battery protection, and an auto‑discharge function on the MAX8866.
The document provides absolute maximum ratings, detailed electrical characteristics, typical operating curves, pin descriptions, and package information for the 8‑pin µMAX package. Guidance on capacitor selection, stability, load‑transient response and noise performance is also included to aid designers of battery‑powered equipment such as cellular phones, cordless phones and modems.
| Input voltage range | +2.5 V to +5.5 V |
|---|---|
| Maximum output current | 100 mA per regulator |
| Dropout voltage (50 mA load) | 55 mV |
| No‑load supply current (quiescent) | 105 µA |
| Operating supply current (typical) | 145 µA |
| Preset output voltage (T version) | 3.15 V |
| Shutdown supply current (off state) | 0.16 nA |
The dropout voltage is 55 mV when the load current is 50 mA.
In shutdown, the MAX8866 actively discharges the selected output voltage to ground.
The regulator draws about 145 µA of supply current even in dropout.
The absolute maximum rating for VIN‑VOUT is –6 V to +6 V.