What this LDO brings to a noise-sensitive rail
The Maxim MAX38911ANT+ is a single-output, positive adjustable LDO regulator delivering up to 500 mA. Its PSRR sits at 80 dB at 1 kHz and rolls off to 44 dB at 1 MHz. The output voltage adjusts from 0.8 V up to 5 V via an external resistor divider. Maximum dropout is 0.165 V at the full 500 mA load.
Protection and control features
Built-in protections cover over-current, over-temperature, and reverse polarity — the reverse-polarity clamp is a notable inclusion for designs where the input could see a wrong-polarity connection during assembly or field service. An enable pin and soft-start are provided as control features. Quiescent current is 750 µA, which is moderate for a 500 mA LDO; not the lowest-Iq option for always-on battery applications, but acceptable for switched rails where the enable pin cuts supply current when the load is idle.
Temperature grade and environment
Rated for a junction temperature range of -40°C to 125°C, this LDO is qualified for industrial and automotive ambient environments. The 125°C junction limit means the part can run at full 500 mA output with proper PCB heatsinking.
Lifecycle and sourcing posture
The MAX38911ANT+ carries an Active product status per the manufacturer, with ROHS3 compliance. No direct pin-compatible second source is listed in the available cross-reference data, so the BOM should be qualified with this Maxim part as the sole source unless a validated alternate is verified independently.