Ultra low noise LDOs for sensitive analogue designs

New Products |
By Nick Flaherty

The NCP16x series, along with the AEC-Q100 qualified NCV81x automotive variants, boosts the performance of automotive ADAS image sensor modules, portable devices and wireless applications including 802.11ad WiGig, Bluetooth and WLAN.

The NCP16x series, launched at PCIM 2018 this week, consists of four devices with a wide input voltage range from 1.9 to 5.5 volts (V) to support a variety of end applications. Output current of 250mA, 450 mA and 700 mA in a common package footprint enable easy scalability of designs.  Ultra-high PSRR of 98dB blocks unwanted power supply noise from reaching sensitive analog circuits, while ultra-low noise of 6.5μV RMS eliminates the need for additional output capacitance.  

The regulators have a low dropout voltage of 80mV, boosting the operating life of battery powered end products along with a no-load quiescent current of 12μA.  They are available in fixed output voltages from 1.2 V to 5.3 V with an accuracy of +/-2% over the entire application range.  Stable operation is achieved with only 1 µF of capacitance on the input and output enabling lower system cost and size. 

A patented architecture achieves the PSRR performance over a wide frequency range of 10 kHz to 100 kHz. 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 ensure the power-per-bit efficiency capability of the system is realised by providing a clean power supply. 

“This new series of ultra-low noise LDOs dramatically improves PSRR, exceeding some conventional LDOs by 30 dB.  Our customers are excited about the new level of performance they are able to achieve with this product family,” said Tim Kaske, Sr. Business Unit Director at ON Semiconductor. “An LDO is still the best solution for low current applications and with the small size and now even higher levels of performance in PSRR and low noise, they are an ideal power management solution for noise sensitive RF and image sensor applications.  As an example of this we have a growing collection of image sensor reference designs that use this new LDO family.  The total system level application provided by ON Semiconductor enables engineers to quickly implement the highest image quality sensor solutions available on the market today.”        

NCP16x devices are available in TSOP-5, XDFN-4, and WLCSP-4. NCV816x Automotive variants are available in TSOP-5 and XDFN-4.


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