Tiny LDOs deliver quiet power for precision sensing

February 09, 2017 // By Graham Prophet
STMicroelectronics' LDLN025 Low-Dropout (LDO) voltage regulators deliver lowest noise performance in relation to output current and footprint, generating less than 6.5 µVrms noise at 250 mA full load with an outline of just 0.63 x 0.63 mm.

To ensure high accuracy and sensitivity the LDLN025 is designed to supply ultra-smooth and stable voltage to precision ICs such as ADCs, VCOs, or sensors. In its small footprint, it enables space-constrained products such as smartphones, smart watches, fitness monitors, medical sensors, and wireless IoT devices to support new and better functions.

 

The LDLN025 combines low-noise operations with a high PSRR (Power Supply Rejection Ratio) of 80 dB at 120 Hz. It can operate with no output filter and is stable with only two small ceramic capacitors that help simplify design and save bill-of-materials costs and board real estate. Quiescent current of 12 µA at no load, and 0.2 µA in shutdown mode controlled by an external Enable pin, minimize overall power consumption and help prolong battery life in portable applications.

 

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

 

In addition to the 0.63 x 0.63 mm Flip-Chip 4-bump package, the LDLN025 is available in a 1 x 1 mm 4-lead QFN. A 2.95 x 1.6 mm SOT23-5L package option is in development. Budgetary pricing is $0.15 (1000). pieces. Samples and selected output-voltage options can be ordered immediately,.

 

ST; www.st.com/ldln025-pr