300 mA LDO with integrated MPU supervisor in SOT-23-6
The MAX6469UT28AD1-T is a low-dropout linear regulator from Maxim Integrated that combines a 300 mA output stage with a microprocessor reset generator in a single SOT-23-6 package. The output is configurable as either adjustable or fixed at 2.8 V, making it suitable for powering a 2.8 V logic rail or sensor supply while the reset output monitors the regulated voltage for brownout conditions. Maximum dropout voltage is 210 mV at the full 300 mA load, so the input rail must stay at least 210 mV above the target output voltage across the operating temperature range to maintain regulation. The quiescent current is 136 µA typical, rising to 96 µA maximum supply current — low enough for battery-operated equipment that spends most of its time in active mode rather than deep sleep.
Protection set and control interface
Protection features include over-current, over-temperature, reverse polarity, and short-circuit — the reverse polarity protection is less common on small LDOs and matters when the regulator sits on a connector-facing rail where a reversed battery or supply cable is a real failure mode. The shutdown control lets the system processor gate the regulator output, dropping the load current to near-zero when the rail is not needed. The reset output asserts when the regulated voltage falls below the reset threshold, holding the processor in reset until the supply recovers. This eliminates a separate voltage supervisor IC on boards where the LDO already provides the core rail.
Active lifecycle and compliance note
The SOT-23-6 package is a standard footprint with 0.95 mm pitch — no special board stack-up or via-in-pad required.