STMicroelectronics L4949ED013TR

Overview

L4949ED013TR from STMicroelectronics is a monolithic 5 V low-dropout linear voltage regulator with integrated power-on reset, input voltage sense comparator, and preregulator functions. It delivers up to 100 mA output current with dropout voltage < 0.5 V at 100 mA, operates from 5–28 V DC input (transient-rated to 40 V), and maintains ±1% output accuracy over temperature and load - designed specifically for microcomputer-supply in automotive control units.

For engineers reviewing the L4949ED013TR datasheet, L4949ED013TR pinout, L4949ED013TR application, or L4949ED013TR equivalent, key selection criteria include its programmable reset delay via external capacitor, 1.23 V internal sense reference for flexible undervoltage monitoring, thermal shutdown protection, and SO-8 tape-and-reel packaging for automated assembly.

Technical Context

The device integrates three functional blocks: a PNP-based LDO regulator with foldback current limiting, a voltage-sense comparator referenced to 1.23 V (±100 mV hysteresis), and a reset circuit triggered when VOUT falls below 4.5 V (VRT = VO − 0.5 V) with externally adjustable delay (tRD = CT × 2 μA / 2 V). The preregulator output (VZ) provides a stabilized 5 V internal rail for improved transient immunity below 8 V input.

All protection features - thermal shutdown (TJSD = 165 °C), short-circuit current limiting (ILIM = 100–400 mA), and ESD protection per MIL-STD-883C - are implemented on-die. Quiescent current remains ≤300 µA across operating temperature (−40 °C to +125 °C) and drops further in standby mode.

Key Specifications

Pinout & Package

Package: SO-8 TP (ECOPACK® compliant), 1.27 mm pitch, body size 4.9 × 6.0 mm, max height 1.75 mm. Thermal resistance: R_{th j-amb} = 200 °C/W (max).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction 5 V automotive LDO applications.

Compared with TL7705ACDR and MAX809SEUR+T, the L4949ED013TR uniquely consolidates regulation, reset, and input sensing into a single SO-8 device - reducing BOM count by ≥2 components and enabling coordinated fault response in safety-critical automotive subsystems.

Availability

L4949ED013TR is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power supplies requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for L4949ED013TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The L4949E belongs to ST's automotive-grade analog power management product line, engineered specifically to meet stringent ISO/TS 16949 quality standards and support fail-safe operation in engine, transmission, and chassis control systems.

FAQ

What is the maximum allowable input voltage for continuous operation?

The L4949ED013TR supports continuous DC input voltages from 5 V to 28 V. Its absolute maximum rating allows transient exposure up to 40 V for durations under 1 second - sufficient to withstand automotive load-dump events per ISO 7637-2 Pulse 5a. Operation above 28 V beyond transient limits risks permanent damage.

Can the sense comparator (SI pin) monitor voltages higher than 28 V?

No - the SI pin has an absolute maximum rating of 28 V (VSIDC). To supervise higher-voltage rails (e.g., 42 V mild-hybrid systems), an external resistive divider must scale the input so that the voltage applied to SI stays within 0–28 V and the sensed threshold remains accurate relative to the 1.23 V internal reference.

Is the VZ pin intended for powering external circuitry?

No - VZ is an internal preregulator output rated for ≤10 µA load. It is not designed to source external current. Using it as a power rail may destabilize internal biasing and degrade transient immunity. ST explicitly states "This output may be used as an option when a better transient behaviour… is required" - only with a decoupling capacitor to GND, not as a supply pin.

Does the L4949ED013TR meet AEC-Q100 qualification?

While the L4949E datasheet does not list AEC-Q100 test results, STMicroelectronics qualifies this device for automotive applications per its design, testing, and packaging (ECOPACK® SO-8 TP). It is widely deployed in production ECUs and BCUs; however, formal AEC-Q100 Grade 1 certification documentation must be obtained directly from ST for safety-critical qualification.