LDO regulators deliver quiet power for precision sensing

The low-dropout (LDO) voltage regulators from STMicroelectronics are said to deliver high noise performance in relation to output current and footprint, generating less than 6.5µV rms noise at 250mA full load.

To ensure high accuracy and sensitivity, the LDLN025 is designed to supply smooth and stable voltage to precision ICs, including ADCs, VCOs, or sensors.

With the advantage of its small footprint, it is claimed to enable space-constrained products – like smartphones, smart watches, fitness monitors, medical sensors, and wireless IoT devices – to support new and better functions.

The regulator combines low noise operations with a high power supply rejection ratio of 80dB at 120Hz. It can operate with no output filter and is stable with only two small ceramic capacitors that help simplify design and save BOM costs and board real estate.

Quiescent current of just 12µA at no load, and 0.2µA in shutdown mode controlled by an external enable pin, minimise overall power consumption and help 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.

In addition to the 0.63 x 0.63mm Flip-Chip 4-bump package, the LDLN025 is available in a 1 x 1mm 4-lead QFN. A 2.95 x 1.6mm SOT23-5L package option is in development.

Author
Peggy Lee