S-19990AA-S8T1U7

Overview

The S-19990AA-S8T1U7 is an automotive-grade switching controller IC from the S-19990 series, manufactured by ABLIC Inc. It supports boost and step-up/step-down DC-DC converter topologies with a fixed switching frequency of 2.2 MHz. The device operates within a wide input voltage range suitable for automotive applications and features adjustable positive output regulation. Packaged in an HTMSOP-8 surface-mount format, it is designed for high reliability under automotive environmental conditions.

Feature Summary

• Supports both boost and step-up/step-down voltage conversion topologies
• Integrated 2.2 MHz switching frequency for compact external component design
• Automotive-grade qualification ensuring reliability in vehicle environments

Applications

• Automotive power supply systems requiring step-up or buck-boost functionality
• Battery voltage boosting in low-voltage automotive networks
• Power management modules for automotive electronic control units

Procurement Notes

Verify the specific output configuration and external component requirements against the official datasheet before procurement. Confirm that the HTMSOP-8 package matches your PCB footprint. Ensure the application environment meets the specified automotive operating temperature ranges. Check for any required certification documentation if integrating into safety-critical automotive systems.

Selection Notes

Select this component when a single IC must handle both step-up and step-down operations in automotive circuits. The 2.2 MHz frequency allows for smaller inductors and capacitors compared to lower-frequency alternatives. Consider the HTMSOP-8 package size constraints and thermal dissipation capabilities during layout planning. Verify compatibility with the target battery voltage range and load requirements.

Part Context

This part belongs to the S-19990 series of automotive voltage regulators. It is distinct from linear LDO regulators and other switching families like the S-19230. The AA suffix typically denotes specific electrical characteristics or pin configurations within the series. It is designed specifically for the demanding reliability standards of the automotive industry.

Replacement Considerations

Direct substitutes may include other ABLIC S-19990 series variants with compatible pinouts and frequencies. Cross-brand replacements require matching the 2.2 MHz switching frequency, HTMSOP-8 package, and automotive grade rating. Verify that alternative controllers support the same boost/buck-boost topology and input voltage range.