Automotive ICs

Automotive, 125°C Operation, 18 V Input, 1 A, Synchronous Step-down Switching Regulator S-19934A/19934B/19935A/19935B Series

The S-19934/19935 Series is a step-down switching regulator developed using high withstand voltage CMOS process technologies.
This IC has high maximum operation voltage of 18 V and maintains high-accuracy FB pin voltage at ±1.5%. As suitable packages for high-density mounting, such as small-sized HSNT-8(2030), are adopted, this IC contributes to miniaturization of electronic equipment.
PWM control (S-19934 Series) or PWM / PFM switching control (S-19935 Series) can be selected as an option.
Since the S-19935 Series, which features PWM / PFM switching control, operates with PWM control under heavy load and automatically switches to PFM control under light load, it achieves high-efficiency operation in accordance with the device’s status. Furthermore, our distinctive PWM / PFM switching control technology suppresses the ripple voltage to be generated in VOUT while PFM control is in operation.
Since the S-19934/19935 Series has the built-in synchronous circuit, it achieves high efficiency easier compared with conventional step-down switching regulators. In addition, it has the built-in overcurrent protection circuit which protects the IC and coils from excessive load current as well as a thermal shutdown circuit which prevents damage from heat generation.

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 18.0 V
Output voltage (externally set)
1.0 V to 12.0 V
Output current
1 A
FB pin voltage accuracy
Oscillation frequency
2.2 MHz typ.
Overcurrent protection function
1.85 A typ. (pulse-by-pulse method)
Thermal shutdown function
170°C typ. (detection temperature)
Short-circuit protection function
Hiccup control, Latch control
100% duty cycle operation
Soft-start function
5.8 ms typ.
Under voltage lockout function (UVLO)
3.35 V typ. (detection voltage)
Input and output capacitors
Ceramic capacitor compatible
Operation temperature range
Ta = −40°C to +125°C
Lead-free (Sn 100%), halogen-free
AEC-Q100 qualified*1

*1. Contact our sales representatives for details.


  • Camera module
  • For automotive use (engine, transmission, suspension, ABS, related-devices for EV / HEV / PHEV, etc.)
  • Constant-voltage power supply for electrical application for vehicle interior
  • Constant-voltage power supply for industrial equipment
  • Constant-voltage power supply for home electric appliance

Parts List

  • 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.