ST Unveils Low-Dropout Voltage Regulator with Ultra-Low Noise and High-Precision Sensing

STMicroelectronics has introduced a Low-Dropout (LDO) voltage regulator that delivers the best-in-class noise performance in relation to output current and footprint, generating less than 6.5µVrms noise at 250 mA full load with an outline of just 0.63 mm x 0.63 mm. The LDLN025, has been designed to supply ultra-smooth and stable voltage to precision ICs like ADCs, VCOs, or sensors. With the advantage of its small footprint, it enables space-constrained products like 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 just 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. It operates with an input voltage from 1.5 V to 5.5 V, with typical dropout of 120 mV. A selection of fixed output voltages from 1.2 V to 5.0 V is available.

In addition to the 0.63 mm x 0.63 mm Flip-Chip 4-bump package, the LDLN025 is available in a 1 mm x 1 mm 4-lead QFN. A 2.95 mm x 1.6 mm SOT23-5L package option is in development. Samples and selected output-voltage options can be ordered immediately, with additional voltages available soon.

Key Features

  • Ultra low output noise: 6.5 µVRMS
  • Operating input voltage range: 1.5 V to 5.5 V
  • Output current up to 250 mA
  • Very low quiescent current: 12 µA at no-load
  • Controlled Iq in dropout condition
  • Very low-dropout voltage: 250 mV at 250 mA
  • Very high PSRR: 80 dB@100 Hz, 60 dB@100 kHz
  • Output voltage accuracy: 2% across line, load and temperature
  • Output voltage versions: from 1 V to 5 V, with 50 mV step
  • Logic-controlled electronic shutdown
  • Output discharge feature
  • Internal soft-start
  • Overcurrent and thermal protections
  • Temperature range: from -40 °C to +125 °C
  • Packages: Flip-Chip4, DFN4-1x1

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