The MAX1819EBL33+T is a single-output positive LDO from Analog Devices, delivering 500 mA with a fixed 3.3 V output (adjustable option also available). Maximum dropout is 0.232 V at the full 500 mA load, meaning the input rail needs to stay at least that margin above 3.3 V to maintain regulation. With a 5.5 V input maximum, this LDO works cleanly off a 3.6 V Li-ion cell or a 5 V USB rail.
Quiescent current and protection for battery duty
Quiescent current is 250 µA typical, which is moderate for a 500 mA LDO — not the lowest in class, but acceptable for always-on peripherals in battery gear where the load current dominates the power budget. The Enable and Power Good control features let the system power down the regulator when the rail is not needed, cutting Iq to near zero. Built-in protection covers overcurrent, overtemperature, and short-circuit conditions, so the regulator can survive a momentary output short without external foldback circuitry.
Package and board integration
The 6-UCSP (1.52 x 1.52 mm) package is a wafer-level chip-scale package with solder bumps directly on the die. The 0.5 mm pitch and small footprint require careful PCB layout — the land pattern must match the supplier device package recommendation exactly, and the board stack-up should keep the thermal path through the bumps to the PCB copper. Store the reels dry: UCSP packages are moisture-sensitive and need dry-bag storage per J-STD-033. Tape & Reel packaging (TR) means the parts come on a carrier tape for automated pick-and-place assembly. The reel quantity is the standard for this package size — confirm the reel count against your build volume when requesting a quote.