ABLIC introduces S-19990/9 Series low EMI automotive regulators

With the increasing electrification of vehicles recently, ECU (*1 Electronic Control Units) and sensors are being incorporated in most applications. Most ECU operate using 12V auxiliary batteries as their main power supply, however, if a vehicle is subject to a severe impact, such as from a traffic accident or collision, and the power is lost, these ECU will stop operating.

As electrification continues to progress, there has also been an accompanying increase in safety requirements. To ensure the safety of vehicle passengers, backup power supplies can be installed for ECU in, for example, electric door latches and E-Call, in order to maintain operation for a set period of time even after an accident. Backup power supplies are generally composed of capacitors/batteries and a step-up circuit, and when they use low voltage capacitors/batteries in order to achieve downsizing and reduced costs, a step-up circuit is required to boost this low voltage to 12V backup power.

The new S-19990/9 Series products launched today are 36V step-up switching regulator controllers which can secure operating voltage from the industry's lowest (*2) 3V, making this an ideal IC for constructing backup power supply step-up circuits. The S-19990/9 Series is available with an oscillation frequency of 400kHz or 2.2MHz.

These ICs are also equipped with a spread spectrum clock generation circuit (*3) which enables reduction of the conduction noise and emission noise emitted by the step-up circuit. These IC can also continue operation at a low consumption current of 60μA typ. during switching off, while still maintaining excellent response characteristics. These features allow these products to support ever increasing safety requirements while continuing to decrease the voltage of backup capacitors/batteries, and achieving downsizing, lower costs, lower noise, lower standby current, and high-speed response.

In addition, the S-19999 Series features a built-in voltage feedback resistance circuit (*4) which cuts off the voltage feedback resistance circuit current path during sleep mode. This makes it possible to reduce standby current more than the S-19990 Series external voltage feedback resistance circuit type.

The S-19990/9 Series is also PPAP (Production Part Approval Process) capable and planned for compliance with Grade 1 of the AEC (*)-Q100 (*Automotive Electronics Council) quality standard for automotive ICs.

Major features

Can start using the industry's lowest (*2) operation voltage

The S-19990/9 Series can achieve operation voltage from 3V, making it possible to boost even from low voltage capacitors/batteries. In addition, because this is a high withstand voltage product with an input voltage of 36V and a rating of 45V, it can be directly connected to 12V auxiliary batteries.

Low EMI, 2.2MHz operation

The S-19990/9 Series is also equipped with a built-in spread spectrum clock generation circuit (*3) which reduces conduction noise and emission noise emitted by step-up circuits. This also makes the products ideal for applications which require low EMI (Electromagnetic Interference). Is also available with an oscillation frequency of 2.2MHz to allow for downsizing including peripheral components.

Low current consumption during switching off

The S-19990 Series features a low current consumption of 60μA typ. during switching off, contributing to reduction of standby current. In addition, the S-19999 Series features a built-in voltage feedback resistance circuit (*4) which cuts off the voltage feedback resistance circuit current path during sleep mode, enabling even greater reduction of standby current.

Utilises the industry's smallest (*5) package

The S-19990/9 Series utilises the industry’s smallest package size HSNT-8(2030) package as a 36V operation step-up switching regulator controller. The HSNT-8(2030) package is an outer lead type with leads outside the package, which allows for easier mounting, higher strength, and automatic visual inspection after mounting.

Also available in gull-wing type HTMSOP-8 package lineups to allow selection of packages to suit customers’ specific applications.

Major specifications

(*1) ECU is an abbreviation of "Electronic Control Unit". This is a general term for a device (unit) which controls systems using electronic circuits. This mainly refers to units installed in automobiles. At present, the majority are equipped with microcontrollers.

(*2) As a 36V operation automotive step-up switching regulator controller spread spectrum function equipped product. Based on our research as of March 2024.

(*3) A technology which can minimise noise peaks generated at specific frequencies (for example 2.2MHz and its harmonics) by modulating oscillation frequencies.

(*4) A feedback resistance circuit is a resistance circuit used to set output voltage.

(*5) As a 36V operation automotive step-up switching regulator controller. Based on our research as of March 2024.

(*6) Contact our sales office for further details.

Application examples

• S-19990 (step-up configuration): Electric door latches, e-Call, TCU, LED, various ECU
• S-19990 (flyback configuration): Inverters, OBC, 48V motors (air conditioner compressors), various ECU
• S-19999: Cranking countermeasures, start-stop systems, various ECU