ABLIC launches the S-19222 series of LDO linear regulators

An LDO linear regulator is an IC that controls output voltage in order to keep output voltage stable.

A variety of safety measures are implemented in order to ensure the realisation of safe traffic infrastructure in light of the continuing electrification and increasing functionality of automobiles. One such safety measure is the control of vehicle operation according to the detection of the vehicle itself and surrounding conditions by various sensors installed in the vehicle.

For example, torque sensors installed in EPS detect the rotation of the steering wheel and output electric signals to power an electric motor that assists in the steering effort. The electric motor then assists in providing steering power in order to provide support for safer driving.

Because the torque sensor must be able to constantly collect accurate data and detect weak signals in real-time in order to output electric signals, stable operation is an absolute requirement at all times; however, one issue is that external noise can interfere with accurate data collection. Large input and output capacitors could be used as a countermeasure to this noise in order to stabilise output voltage; however, this would also result in additional problems such as higher costs and larger footprint for the boards.

The S-19222 Series launched has a high PSRR of 75dB (f=1kHz) which makes it highly capable of removing overlapping ripple noise in the input power supply in order to provide a stable output voltage.

The S-19222 Series also features a fast transient response which makes it capable of providing stable voltage even in the event of major fluctuations in input voltage caused by cranking.

These features ensure stable operation even with smaller input and output capacitors making it possible to use smaller components at lower costs while also contributing to improvement of safety.

In addition, the S-19222 Series does not require the trade-off of higher current consumption normally required for high PSRR and fast transient response, but instead achieves lower current consumption and thereby contributes to lower standby current in ECUs.