S-19315AAEA-U5T1U7

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The S-19315AAEA-U5T1U7 is an automotive-grade linear regulator with a built-in reset function, manufactured by ABLIC Inc. It operates within a junction temperature range of -40°C to +125°C and supports a maximum input voltage of 36.0 V. The device provides a fixed output voltage of 1.5 V with an accuracy of ±2.0% across the operating temperature range. It delivers up to 40 mA of output current and features a typical dropout voltage of 240 mV at 30 mA. The integrated detector monitors the SENSE pin for voltages between 3.0 V and 11.3 V, utilizing Nch open-drain output. Total current consumption is typically 2.0 μA during operation and 0.5 μA during detection.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrates a positive voltage regulator block with a low dropout characteristic and a separate detector block for system monitoring.
• Features a sense-input reset function where the RO pin output logic responds to voltage levels detected at the dedicated SENSE pin.
• Includes built-in overcurrent protection and thermal shutdown circuits to limit output transistor current and prevent overheating.
• Supports ceramic capacitors for both input and output stabilization, ensuring stable phase compensation in compact designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Constant-voltage power supply and reset circuit for automotive electric components
• Power supply and reset circuit for low-current battery-powered devices

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify that the specific ordering suffix matches the required package type and environmental specifications. Confirm compatibility with AEC-Q100 reliability standards if intended for automotive safety-critical applications. Contact sales representatives for details on thermal simulation services and FIT rate calculations to support functional safety design requirements.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Ensure the input voltage remains within the 3.0 V to 36.0 V operational range while accounting for load dump withstand capabilities. Select appropriate input and output ceramic capacitors with capacitance values of 1.0 μF or more to prevent oscillation. Evaluate power dissipation limits carefully when designing for high output currents to avoid triggering thermal shutdown circuits.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This component belongs to the S-19315 Series, which utilizes high-withstand voltage CMOS process technology. The series is designed specifically for automotive environments requiring 125°C operation. It combines voltage regulation with precise voltage detection in a single IC, reducing component count and board space compared to discrete solutions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes within the same series include other variants of the S-19315 family with different output voltages or detection thresholds. Ensure any replacement maintains the SOT-89-5 package configuration and matches the required electrical parameters for the specific application.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How does the discharge shunt circuit affect the output voltage during detector detection?

When the detector enters the detection status, the internal ON/OFF circuit stops, turning off the output transistor. Simultaneously, the built-in discharge shunt circuit activates, pulling the VOUT pin down to the VSS level to rapidly discharge the output capacitor.

What is the recommended power-on sequence for the VIN and SENSE pins?

Power should be applied to the VIN pin first, followed by the SENSE pin. Applying power to the SENSE pin before the VIN pin may cause erroneous release behavior even if the SENSE voltage is below the release threshold.