The MAX8863T/S/R and MAX8864T/S/R are low-dropout linear regulators that operate from a +2.5V to +6.5V input range and deliver up to 120mA. These devices feature a PMOS pass transistor, allowing the low, 80µA supply current to remain independent of the load, making them ideal for battery-operated portable equipment such as cellular phones, cordless phones, and modems. The devices offer Dual Mode™ operation, with the output voltage preset at 3.15V for the T versions, 2.84V for the S versions, or 2.80V for the R versions, or adjustable with an external resistor divider. Additional features include low-power shutdown, short-circuit protection, thermal shutdown protection, and reverse battery protection. The MAX8864 also includes an auto-discharge function, which actively discharges the output voltage to ground when the device is placed in shutdown mode. Both devices come in a miniature 5-pin SOT23-5 package.
The MAX8863T/S/R and MAX8864T/S/R are low‑dropout linear regulators designed for battery‑powered equipment such as cellular phones, cordless phones, and modems. They operate from a +2.5 V to +6.5 V input range and deliver up to 120 mA output current, with preset output voltages of 3.15 V (T), 2.84 V (S) or 2.80 V (R) or an adjustable range of 1.25 V to 6.5 V.
Key features include a low‑quiescent 68 µA no‑load supply current, active‑low shutdown pin that reduces supply current to 0.1 nA, thermal overload protection at 170 °C, reverse‑battery protection, and an auto‑discharge function on the MAX8864. The document lists absolute maximum ratings, detailed electrical characteristics, pin functions, typical operating circuits, and guidelines for capacitor selection and stability.
| Input voltage range | +2.5 V to +6.5 V |
|---|---|
| Maximum output current | 120 mA |
| Preset output voltage (T version) | 3.15 V |
| Preset output voltage (S version) | 2.84 V |
| Preset output voltage (R version) | 2.80 V |
| Adjustable output voltage range | 1.25 V to 6.5 V |
| Dropout voltage (typical @50 mA) | 55 mV |
| No‑load supply current | 68 µA |
| Shutdown supply current | 0.1 nA |
| Thermal shutdown temperature | 170 °C |
| Power‑supply rejection (low frequency) | 62 dB |
| Output noise (typical) | 350 µVRMS |
They operate from a +2.5 V to +6.5 V input range.
The devices can deliver up to 120 mA of output current.
The no‑load supply current is typically 68 µA.
An active‑low SHDN pin shuts down the regulator, reducing supply current to about 0.1 nA; for the MAX8864 it also discharges the output to ground.