LDOs’ noise performance is designed for precision sensing

Low dropout (LDO) voltage regulators from ST Microelectronics generate less than 6.5microVrms noise at 250mA full load with an outline of just 0.63 x 0.63mm.

The LDLN025 is designed to supply smooth and stable voltage to precision ICs like ADCs, VCOs, or sensors. Its small footprint allows it to be used in space-constrained products like smartphones, smart watches, fitness monitors, medical sensors, and wireless IoT devices.

It combines low-noise operations with a high PSRR (power supply rejection ratio) of 80dB at 120Hz. It can operate with no output filter and is stable with only two small ceramic capacitors to simplify design and save bill-of-materials costs and board real estate. Quiescent current is just 12microA at no load, and 0.2microA in shutdown mode controlled by an external enable pin, to minimise power consumption and prolong battery life in portable applications.

The LDLN025 operates with an input voltage from 1.5 to 5.5V, with typical dropout of 120mV. A selection of fixed output voltages from 1.2 to 5.0V is available.

Package options are the 0.63 x 0.63mm flip-chip, four-bump package, and 1.0 x 1.-mm four-lead QFN. A 2.95 x 1.6mm SOT23-5L package option is in development.



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