ABLIC has developed the S-19720 voltage tracker specifically for automotive applications, aiming to enhance sensing accuracy. The key feature of the S-19720 is its low offset voltage, which is limited to ±5 mV. This enables the voltage tracker to effectively regulate the power supply voltage of off-board ratiometric sensors, ensuring it remains equal to the reference voltage (VREF) of the analog-to-digital converter (ADC) responsible for ECU measurements. By maintaining this consistency, the S-19720 significantly improves the accuracy of sensor readings processed by the ECU.
To ensure the reliability of the system, the S-19720 integrates various protective circuits. It includes an overcurrent protection circuit that safeguards the ECU even in the presence of short circuits to power or ground in wire harnesses. Additionally, a thermal shutdown circuit is incorporated to prevent overheating, while a reverse current protection function protects against damage caused by reverse current flow.
Energy efficiency is another notable aspect of the S-19720. During power-off, the voltage tracker operates with a remarkably low current consumption of 4 µA (typical) when the power-off function is activated. This feature not only optimizes energy usage but also provides continuous protection to the ECU, even when the vehicle is not in operation.
In summary, ABLIC's S-19720 voltage tracker is a reliable and efficient solution that contributes to high-accuracy sensing in automotive applications. With its precise voltage regulation, protective features, and low power consumption, it ensures the ECU receives accurate sensor readings while maintaining system integrity and efficiency.
Input voltage: 4.0 V to 36.0 V
Offset voltage: ±5 mV (0.1 mA ≤ IOUT ≤ 50 mA)
Dropout voltage: 160 mV typ. (VADJ/EN = 4.0 V, IOUT = 10 mA)
Output current: Possible to output 50 mA (VIN = VADJ/EN + 2.0 V)*1
Input capacitor: A ceramic capacitor can be used (1.0 μF or more)
Output capacitor: A ceramic capacitor can be used (1.0 μF to 1,000 μF)
Built-in overcurrent protection circuit limits overcurrent of output transistor
Built-in thermal shutdown circuit with detection temperature of +175°C typ.
Reverse current protection function: IREV = -5 μA min. (VIN = 0 V, VADJ/EN = 5.0 V, VOUT = 16.0 V)
Operation temperature range: TA = -40°C to +125°C
Lead-free (Sn 100%), halogen-free
Withstand 45 V load dump
AEC-Q100 qualified
Current consumption:
During operation: 30 μA typ.
During power-off: 4.0 μA typ.
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