Dual 300mA LDO with fixed 3.3V rails
The MAX8559ETAAA+T from Analog Devices packs two independent 300mA low-dropout regulators into a single 8-TDFN-3x3 package, each delivering a fixed 3.3V output. This is not a single 600mA rail — the two outputs are separate, each with its own enable pin and protection, so you can power two 3.3V loads (like an MCU core and its analog front-end) from one small footprint. The 120mV maximum dropout at 100mA per channel means the input needs to stay above 3.42V to hold regulation; a 3.6V battery rail is fine, but a 3.3V rail is not. Quiescent current sits at 290 µA total for both channels, which is reasonable for always-on peripherals. PSRR is 70dB at 10kHz and 54dB at 100kHz. Protection includes over-current, over-temperature, and short-circuit.
Package and layout fit
The 8-TDFN-3x3 exposed-pad package (3mm x 3mm body) is a common footprint for dual LDOs. The exposed pad must be soldered to a ground-plane copper island for thermal relief — at 300mA per channel, total dissipation can hit about 1W at high Vin, and the pad is the only thermal path. The supplier device package is 8-TDFN (3x3), so the land pattern matches standard 8-pin TDFN with a center pad. Surface-mount only; no through-hole variant exists.