Nisshinbo Micro Devices NR1640

Today’s automobiles are equipped with an increasing number of advanced driving assist systems (ADAS) and cameras in accordance with the advance of autonomous driving. Sensors included in these devices are required to be able to perform high-accuracy sensing. Especially, sensing performance can be affected by noise superimposed on the power supply to those sensing systems, so power management ICs need to have ultra-low noise and high PSRR characteristics.

The NR1640 series is an LDO regulator product featuring ultra-low noise and high PSRR simultaneously. With the output noise of 6.0 μVrms and PSRR of 80 dB, the new product will contribute to enhancing the performance of automotive sensors.

Basic specifications are as follows: the input voltage range of 2.7 V to 5.5 V (Rating: 6.5 V); the output current of 200 mA; and the output voltage range of 2.5 V to 4.8 V (0.1 V step, internally fixed version). In addition, it corresponds to a wide operating temperature range of -40°C to +125°C with the output voltage accuracy of ±1.5 %, which enables the IC to operate properly even in harsh environments.

Key features

• Input voltage range (maximum rating): 2.7 V to 5.5 V (6.5 V)
• Operating temperature range: −40 °C to 125 °C
• Output voltage range: 2.5 V to 4.8 V
• Output current: 200 mA
• Quiescent current: Typ. 350 µA
• Output noise voltage: Typ.6 µV_rms (I_OUT = 100 mA)
• Ripple rejection: Typ.80 dB (f = 1 kHz), Typ.80 dB (f = 100 kHz)
• Dropout voltage: Typ.0.13 V (I_OUT = 200 mA, V_SET = 3.3 V)
• Slope of output voltage at Start-up: 55 / 110 / 220 / 440 µs / V, selectable from 4 types
• Auto-discharge function: Selectable by product name

Applications

• Automotive sensors for ADAS applications
• Drive monitoring systems
• Sensing cameras
• Industrial equipment
• Surveillance cameras