The TCR3DG11,LF is a 300 mA fixed-output LDO from Toshiba's TCR3DG series, delivering 1.1 V with a power-supply rejection ratio of 70 dB at 1 kHz. That PSRR figure means ripple on the input rail — from a switching preregulator or a noisy 5 V bus — is attenuated by a factor of 3,000 before it reaches the load. For an ADC reference or a sensor front-end drawing under 100 mA, this keeps the supply noise floor below the converter's LSB.
Package and board-fit — 0.65 x 0.65 mm WCSPE
The 4-bump WCSPE package measures 0.65 x 0.65 mm — roughly the footprint of a 0402 resistor. This places the LDO directly next to the load, minimising the PCB trace inductance between the output cap and the powered device. The trade-off is board-level routing: the 0.4 mm pitch requires a via-in-pad or microvia fan-out on a standard 4-layer stack-up. Surface-mount assembly with the enable pin (active-high) lets the system power-down the regulator without a load switch. The protection block — inrush current limiting, overcurrent, and thermal shutdown — handles the start-up surge into a large decoupling cap and protects against a shorted output.
RoHS compliance is confirmed per the manufacturer's declaration.