Automotive ICs

Automotive, 125°C Operation, 36 V Input, 250 mA Voltage Tracker with Reverse Current Protection And Anomaly Notification S-19721 Series

Features of automotive voltage tracker S-19721 Series

This IC, developed by using high-withstand voltage CMOS process technology, is a voltage tracker with a reverse current protection and an anomaly notification function, which has high-withstand voltage and low current consumption.
Since the maximum operating voltage is as high as 36 V and the current consumption is as low as 40 μA typ., it contributes to the reduction of standby current.
This IC operates stably due to the internal phase compensation circuit so that users are able to use low ESR ceramic capacitor as the output capacitor.
This IC includes an overcurrent protection circuit that prevents the load current from exceeding the current capacity of the output transistor and a thermal shutdown circuit that prevents damage because of overheating.
Due to the built-in reverse current protection function that protects the IC from the overvoltage application to the output pins, the reverse current flowing from the VOUT pin to the VIN pin can be controlled as the small value −5 μA min. Therefore, IC protection diode is not needed.
In addition, an anomaly notification function is equipped to notify the activation of protection functions against the anomalies, contributing to safety design.

Thermal simulation service
ABLIC Inc. offers a “thermal simulation service” which supports the thermal design in conditions when our power management ICs are in use by customers. Our thermal simulation service will contribute to reducing the risk in the thermal design at customers development stage.
For more information regarding our thermal simulation service, contact our sales representatives.

FIT rate calculation
ABLIC Inc. offers FIT rate calculated based on actual customer usage conditions in order to support customer functional safety design.
For more information regarding our FIT rate calculation, contact our sales representatives.

Caution: This product can be used in vehicle equipment and in-vehicle equipment. Before using the product for these purposes, it is imperative to contact our sales representatives.


Input voltage
4.0 V to 36.0 V
Output voltage
Adjustable down to 2.0 V min.
Offset voltage
±4.5 mV (0.1 mA ≤ IOUT ≤ 250 mA)
Dropout voltage
330 mV typ. (VADJ = 4.0 V, IOUT = 125 mA)
Current consumption
During operation: 40 μA typ.
During power-off: 3.7 μA typ.
Output current
Possible to output 250 mA (VIN = VADJ + 2.0 V)*1
Input capacitor
A ceramic capacitor can be used. (4.7 μF or more)
Output capacitor
A ceramic capacitor can be used. (4.7 μF to 1000 μF)
Built-in overcurrent protection circuit
Limits overcurrent of output transistor.
Built-in thermal shutdown circuit
Detection temperature 175°C typ.
Built-in overvoltage detection circuit
A/B type : Detects an output short-circuit of the higher voltage.
Reverse current protection function
IREV = −5 μA min. (VIN = 0 V, VADJ = 5.0 V, VOUT = 16.0 V)
Anomaly notification function
INT pin notifies operation anomaly of the IC.
A type : Overvoltage, ground fault, overheat
B type : Overvoltage, overheat
C type : Ground fault, overheat
Operation temperature range
Ta = −40°C to +125°C
Lead-free (Sn 100%), halogen-free
Withstand 45 V load dump
AEC-Q100 qualified*2

*1. Please make sure that the loss of the IC will not exceed the power dissipation when the output current is large.
*2. Contact our sales representatives for details.


  • Power supply for automotive off-board sensors
  • For automotive use (engine, transmission, suspension, ABS, related-devices for EV / HEV / PHEV, etc.)

Parts List

  • U(Ux), S and G at the end of the product name of ABLIC Inc. were used to indicate different material specifications as “environmental code”,
    however, these have now been unified into “lead-free and halogen-free” and are identical in terms of environmental quality.
  • Note: Lead-free plating other than 100% Sn is applied to some limited old products, therefore, please contact our sales representatives for details.
  • These descriptions may be different from the actual product name and parameter.
    Please confirm the product name and specifications with the data sheet again.
  • The information herein is subject to change without notice.