L4938EPD13TR

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

The L4938EPD13TR is a monolithic dual linear voltage regulator from STMicroelectronics, designed for microcomputer-controlled systems. It features two low dropout outputs: Output 1 provides a fixed 5V at 100mA with high precision, while Output 2 delivers up to 400mA and is adjustable via an external divider. The device operates within a DC supply range of 5V to 28V, with transient tolerance up to 40V. Key integrated functions include power-on reset with an adjustable threshold (3.8V–4.7V), enable control, and input voltage sensing. It utilizes a 20-SOIC package.

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

• Dual output configuration with one fixed high-precision standby rail and one high-current adjustable main rail
• Integrated power-on reset generator with user-adjustable threshold voltage levels
• Input voltage sense capability combined with enable pin functionality for system management
• Robust protection against negative transients on control inputs down to -5V

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

• Automotive microcomputer controlled systems
• Embedded systems requiring dedicated standby power rails
• Voltage regulation for logic circuits with reset monitoring requirements

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

Verify component authenticity through authorized channels as the part may be obsolete. Confirm RoHS compliance status, as documentation indicates potential non-compliance for specific suffixes. Ensure the 20-SO package footprint matches the design layout. Validate that the adjustable output configuration meets the target voltage requirements before integration.

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

Select this component when a dual-output LDO with integrated reset generation is required. It is suitable for applications needing a stable 5V standby supply alongside a programmable main supply. Consider the 20-pin package size and thermal characteristics. Verify that the input voltage range aligns with the system's power source capabilities.

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

This component belongs to the L4938 family of advanced voltage regulators. It is specifically engineered for automotive and industrial environments where reliability under varying supply conditions is critical. The EPD suffix denotes the specific package and tape/reel configuration used for surface-mount assembly.

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

NCV47411PAAJR2G by onsemi is listed as a similar substitute. Verify pin compatibility and electrical specifications before substitution.