High-voltage monitor IC "NJU7890" that realizes miniaturization of high-voltage circuits and improved detection accuracy

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Product Pickup Analog Nisshinbo Micro Devices

In the future, those who design circuits to monitor high voltages will likely have needs such as "I want to miniaturize the high-voltage divider resistor circuit" and "I want information on how to improve the accuracy of the detection voltage." This time, we will introduce a product that is suitable for "miniaturizing" and "improving the accuracy" of high-voltage monitor circuits: the "High-Voltage Monitor IC (NJU7890)."Please take a look.

High Voltage Monitor Challenges

Six issues faced by multi-stage resistor circuits

If resistors are designed as discrete components, it is difficult to absorb errors resulting from calculation of individual variations.
If resistors are designed as discrete components, there is a possibility that resistor defects may occur during mounting.
When mounting resistors with a value of 1 MΩ or more on a board, various considerations must be made, such as individual leakage, leakage between resistors, the effects of dust, the effects of voids caused by high voltage, and the effects of fluctuations due to humidity.
When resistors are arranged in a row, a certain insulation distance is required, which takes up a lot of space. As a result, costs increase according to the board size, and special insulating coating materials may be required for mounting.
In application boards used at high temperatures, the resistance value changes due to the stress that occurs.
As the number of parts increases, the labor required for FMEA design assurance increases.

Product Summary

What is the high voltage monitor IC "NJU7890"?

This is a high-voltage monitor IC that can accept input voltages up to 1000 V. Nisshinbo Micro Devices' proprietary semiconductor process technology enables a wide common-mode/differential input voltage range.

It is ideal for applications that monitor battery voltages in HVs and EVs, and power supply voltages in inverters.

item	content
Power supply voltage range	2.2V ～ 5.5V
structure	CMOS structure
Operating temperature range	-40℃ ～ +125℃
Junction Temperature	+150℃
package	PMAP11-PM
AEC-Q100	AEC-Q100 grade 1
Input Common Mode Voltage	1000V
Differential Input Voltage	±1000V
High accuracy attenuation rate error	±1% (Ta = −40℃ to 125℃)
High input resistance	30MΩ (Min.)
remarks	Built-in EMI filter