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High Noise Immunity Power Management ICs to Combat Against Electromagnetic Noise

For Customers Being Annoyed by Immunity Testing and EMS Countermeasures.

Annoyed by Failing Noise Immunity Testing after Finishing Board Design?

Have you ever experienced a malfunction due to low noise immunity after developing a new application board? This problem can sometimes happen after passing characteristics tests. Finding the cause of the problem can be very expensive and time consuming. If you are lucky, you could locate and identify the components with the problem and then search for suitable replacement parts. However, it is not always so easy or so simple. In the worst case, you may have to redesign the board which is very costly and time consuming. It is difficult to predict how noise will affect the developing application and adding countermeasures is one of the main factors that lead to increase development time and cost.

Without proper noise immunity, electromagnetic noise can cause abnormal function which may lead to injury or fatal accident especially as electronic devices are increasingly used in cars and industrial equipment. Therefore, it is critical that today's electronic systems take proper precautions to safeguard against unwanted noise.

Importance and Problems on Electromagnetic Susceptibility (EMS)

Everywhere we go, we are surrounded by invisible electromagnetic noise which increases at a high rate with the evolution of electronic devices.

To ensure stable operation of electrical devices under an environment full of electromagnetic noise, there is a growing list of requirements for systems to be equipped with high noise immunity functions. Here are a few examples of common noise immunity requirements: ISO 11452 is an international set of immunity standards and guidelines for automotive electrical components, Transverse Electromagnetic (TEM) call method, and Bulk Current Injection (BCI) method.

If a system cannot pass noise immunity testing, the time and cost would increase due to the need to re-design the circuit and rerouting the wiring patterns of the board.

Incident Cases

There are many cases where manufacturer’s product malfunctioned due to electromagnetic noise and were later required to take corrective action. These cases demonstrate the importance of EMS countermeasures to be as strong and robust as possible and to protect against electromagnetic interference from other devices.

Incident Cases Relating to Electric Wave Announced by Ministry of Internal Affairs and Communications

Type of Affected Device Affected Type of Disorder Interferer Detail Cause and Countermeasure
Communication facility PC Malfunction Illegal CB radios Computer Malfunction Unspecified multiple illegal CB radios.
Home appliance Automatic Door Malfunction Illegal CB radios Automatic Door Malfunction Countermeasures taken by product manufacturer.
Home appliance Electronic bidet Malfunction Illegal CB radios Electronic bidet malfunction, making the floor water-soaked. Unspecified multiple Illegal CB radios.
Countermeasures taken by product manufacturer.
Home appliance Radio-controlled wrecker Malfunction Illegal CB radios Malfunction Unspecified multiple Illegal CB radios.
Countermeasures taken by product manufacturer.
Sensors Ultrasonic diagnostic equipment Noise Neon tube for indoor lighting Marble noise generated during medical diagnostics, occurred frequently. Sweep noise was found at frequrency from 2 to 5MHz.
Defective neon tube for indoor lighting caused the malfunction by oscillating abnormally. Replaced with a normal one.
Sensors Electrocardiograph Malfunction Power induction Irregular fluctuations in cardiograph Abnormality inducted by the power supply. No failure found when powered by a battery. The equipment was replaced with another model.
Sensors Business-use electronic thermometer Malfunction Unnecessary radio wave Business-use electronic thermometer malfunction Affected by unnecessary radios, etc.
Countermeasures taken by product manufacturer.
Sensors Ultrasonic diagnostic equipment Malfunction Unnecessary radio wave, power induction Multiple noise generated during ultrasonic diagnostics at a hospital.
Occurred during using a probe from 2.5 to 7.5 MHz.
Noise generated from multiple sources. One of them is not unnecessary radio waves but induction noise from an elevator to the power supply.

Cited from Ministry of Internal Affairs and Communications in Japan
https://www.soumu.go.jp/soutsu/tohoku/kanshi/case.html

High Noise Immunity Power Management ICs

Input Voltage Range (Maximum Rating):

3.5 V to 42 V (50 V)

Output Voltage Range:

1.8 V to 12.0 V

Output Current:

200 mA

Output Voltage Accuracy:

±0.6% (Ta=25°C)

Standby Current:

Typ. 0.1 µA

Supply Current:

Typ. 2.2 µA (No Load)

Operating Temperature Range:

-50°C to 125°C

Packages:

DFN(PLP)1820-6, SOT-23-5,
SOT-89-5, HSOP-6J, HSOP-8E

Input Voltage Range (Maximum Rating):

3.5 V to 42 V (50 V)

Output Voltage Range:

1.8 V to 9.0 V

Output Current:

300 mA

Output Voltage Accuracy:

±0.6% (Ta=25°C)

Standby Current:

Typ. 0.1 µA

Supply Current:

Typ. 32 µA (No Load)

Operating Temperature Range:

-40°C to 125°C

Package:

HSOP-8E

Input Voltage Range (Maximum Rating):

3.5 V to 42 V (50 V)

Output Voltage Range:

2.2 V to 14.0 V (Tracking Voltage)

Output Current:

70 mA

Output Voltage Accuracy:

±15mV (All Temp.)

Standby Current:

Typ. 0.1 µA

Supply Current:

Typ. 60 µA (No Load)

Operating Temperature Range:

-40°C to 125°C

Packages:

SOT-23-5, HSOP-8E

* Note: The operating temperature range varies for different products. For more details, please check each product page.

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