Automotive ICs

Automotive, 125°C Operation, 36 V Input, Low EMI, Step-Up / Flyback Switching Regulator Controller S-19990 Series

Ideal for emergency backup battery Switching Regulator Controller S-19990/9 Series

This IC is a step-up / flyback switching regulator controller developed using high withstand voltage CMOS process technologies.
Its wide input operating range of 3.0 V to 36 V makes it suitable for powering automotive start-stop systems and emergency battery backup systems. When this IC is used to configure a converter and the output voltage (VOUT) of the converter is applied to the VIN pin in a bootstrap configuration, the input voltage can be extended below the operating input voltage range after startup.
This IC contributes to system space saving as it adopted suitable packages for high-density mounting like small-sized HSNT-8(2030), can operate at very high switching frequencies, and the peripheral parts can be made compact. A built-in spread spectrum clock generation circuit enhances the EMI performance of the system.
An overcurrent protection circuit protects the IC and the coil from excessive load current, and a thermal shutdown circuit 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
3.0 V to 36.0 V
Low voltage operation after startup (bootstrap configuration)
Control system
Current mode
FB pin voltage accuracy
Oscillation frequency
2.2 MHz typ., 400 kHz typ.
Spread spectrum clock generation function
FSSS = +6% typ. (Diffusion rate)
Overcurrent protection function
Pulse-by-pulse method
Thermal shutdown function
170°C typ. (detection temperature)
Short-circuit protection function
Hiccup control, Latch control
Soft-start function
5.8 ms typ.
Under voltage lockout function (UVLO)
2.75 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
Withstand 45 V load dump
AEC-Q100 in process*1

*1. Contact our sales representatives for details.


  • Automotive and industrial step-up flyback converters
  • Automotive start-stop systems
  • Emergency battery backup systems
  • Automotive LED lamps
  • 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.