Ultra high PSRR LDO regulators tackle tough applications

The latest in low noise LDO regulators with supply rejection ratio (PSRR) targeted at noise sensitive analogue designs have been released by ON Semiconductor

The NCP16x series, along with the AEC-Q100 qualified NCV81x automotive variants, is aimed at delivering improved performance in applications such as automotive ADAS image sensor modules, portable devices and wireless applications – including 802.11ad WiGig, Bluetooth and WLAN.

The NCP16x series comprises four devices with a wide input voltage range from 1.9 to 5.5V to support a variety of end applications. ON Semiconductor states that the output current of 250mA, 450mA and 700mA in a common package footprint enable easy scalability of designs. Meanwhile, ultra-high PSRR of 98dB blocks unwanted power supply noise from reaching sensitive analogue circuits, while ultra-low noise of 6.5uV RMS means there is no need for additional output capacitance.

These new LDO regulators have a low dropout voltage of 80mV, supporting and helping to prolong the operating life of battery powered end products. This is further enhanced by a no-load quiescent current of 12-microA. They are available in fixed output voltages from 1.2V to 5.3V with an accuracy of +/-2% over the entire application range. Stable operation is achieved with only 1 micro-Farad of capacitance on the input and output which, says the company, enables lower system cost and size.

A new patented architecture is implemented to achieve the ultra-high PSRR performance and providing high PSRR over a wide frequency range (10 kHz to 100 kHz) is important to end application performance. In image sensor applications for ADAS cameras, for example, the NCV8163 provides improved image quality by filtering out power supply noise that would otherwise corrupt the voltage signal applied to the pixel. In wireless applications such as WiGig 802.11ad, the combination of ultra-high PSRR and ultra-low noise as seen in the NCP167 helps ensure the power-per-bit efficiency capability of the system is realised by providing a clean power supply.

NCP16x devices are available in TSOP-5, XDFN-4, and WLCSP-4. NCV816x Automotive variants are available in TSOP-5 and XDFN-4. All are suitable for modern high-density designs.

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