High PSRR LDO Regulators

Conceived for noise-sensitive and RF applications, this series of high-performance LDO regulators feature remarkable power supply rejection ratio characteristics (up to 92 dB at 1 kHz) and ultra-low noise operation (as low as 6.3 µVRMS) resulting in cleaner and stable output voltages suitable for ultra-sensitive loads. Their advanced design guarantees fast and stable dynamic performance with low power consumption.

Ultra-low-dropout linear regulator with programmable soft-start

The LD59150 is a 1.5 A ultra-low-dropout voltage regulator designed to efficiently and accurately supply a variety of low-voltage circuits in automotive and industrial applications. This is achieved thanks to a dropout voltage as low as just 65 mV at maximum load, which minimizes power losses, and an initial output accuracy of 0.5% (2% overall) along with a very high PSRR (> 80 dB @ 100 Hz).

Medium power MCUs, ASICS and other sensitive logic may benefit of the Power Good and programmable Soft Start features which allow a safe and correct power sequencing while keeping the inrush current under control. The LD59150’s input voltage range is 0.8 to 5.5 V, with an auxiliary bias voltage (VBIAS) of 2.7 to 5.5 V, while the output voltage can be adjusted between 0.8 and 3.6 V. The device comes in a compact, 3 x 3 mm, DFN10 package with wettable flanks and is automotive-grade qualified according to AEC-Q100 Level 1.

Ultra-low-noise and low-consumption LDO for ultra-sensitive loads

The LDLN025 is a series of 250 mA low-dropout voltage regulators designed for noise sensitive loads. Able to work with an input voltage range from 1.5 to 5.5 V, it provides accurate and stable voltage to precision ADCs, VCOs, or sensors, in space-constrained products such as smartphones, smart watches, fitness monitors, medical sensors, and wireless IoT devices.

Due to its best-in-class output noise figures (<6.5 µVRMS) and very high PSRR (80 dB), the LDLN025 provides a very clean output, suitable for ultra-sensitive loads. Moreover, its very low quiescent current, only 12 μA at no-load, extends the battery life of applications requiring very long standby time.