New Industry Products

ABLIC’s New Battery Monitoring IC Offers High Withstand Voltage

September 01, 2021 by Gary Elinoff

The new series of devices, aimed at automotive applications, features overvoltage, undervoltage, and analog monitoring in a single IC.

The S-191L/N series monitors voltage in an ECU (Electronic Control Unit). The units feature a supply voltage divided output that serves to divide high voltage into low voltage. Series members offer an output that can be input directly to an A/D converter or MCU.

Few external parts are required. Image courtesy of ABLIC

ABLIC claims it is the first to offer this supply voltage divided output architecture. The various individual series members can divide the supply voltage by 6, 8, 12, or 14. See the datasheet for specific details on the separate series members.


Reducing the Need for External Parts and Simplifying the Designer’s Task

As illustrated above, the need for external battery monitoring circuitry is eliminated, as those functions are achieved internally by the new device. Additionally, the need for the OEM to engineer some tricky impedance matching between those components and the MCU is also obviated. Because of these innovations, the vehicle battery’s output can be connected to the series members’ input pin.

Members of the S-191L/N Series provide an internal circuit for controlling supply voltage’s divided output by turning it on and off, which serves to reduce standby current. This will again reduce the number of external parts and their footprint. And here, especially, normal variations in commercial parts in this sphere could impact accuracy and lead to failure rates.


A Wide Input Voltage Range

The S-191L/N Series’ SENSE pin, which serves as an input for the voltage being monitored, has an input voltage range of -30V to 45V. This exceptionally wide range enables series members to cope with overvoltage tests or with tests designed to simulate reverse connections.

The units’ multiple voltage monitoring functions include built-in facilities for reporting undervoltage and overvoltage.



  • Operating voltage range is from 3 to 36.0V

  • Current consumption

               ○ The device feature a typical standby current of 0.9µA

               ○ During supply voltage divided output typically operates at 1.3 μA 

  • It is specced at a monitoring accuracy of 1.5%

  • Undervoltage detection voltage is 4.0V to 10.0V in 0.05V steps

  • Overvoltage detection range is 16.0V to 18.0V in 0.1 V steps

Details on other members of ABLIC’s battery monitoring IC product line can be found on this product page.



  • Detection of automotive electric device overvoltages

  • Measuring automotive battery voltage

  • Use in automotive devices including the engine, transmission, suspension, or ABS


Physical Considerations

For the sake of avoiding a disastrous short circuit, the voltage input pin and the ground pin have been placed away from each other, on opposite sides of the chip. 

  • The unit is also PPAP (Production Part Approval Process)-capable

  • Operating temperature range is -40 to +125℃

  • Available in a 2 x 3 x 0.5mm HSNT-8(2030) package



  • The S-191L/N Series meets AEC-Q100 standards



  • Lead-free (Sn 100%)

  • Halogen-free