STMicroelectronics L5050SDTR

Overview

L5050SDTR from STMicroelectronics is a dual-channel, electrically isolated 5 V low-dropout linear voltage regulator in SO-8 package, designed for automotive power management. It delivers up to 2×50 mA DC output current per channel, maintains ±2% output voltage accuracy over −40 °C to +150 °C junction temperature, and operates from 5.6 V to 40 V input supply. Its dual enable inputs (En1/En2), thermal shutdown, short-circuit protection, and AEC-Q100 qualification make it suitable for safety-critical body control modules and infotainment power rails.

For engineers reviewing the L5050SDTR datasheet, L5050SDTR pinout, L5050SDTR application, or L5050SDTR equivalent, key selection criteria include dual isolated regulation capability, 500 mV max dropout at 100 mA pulsed load, 5 µA quiescent current per channel in disable mode, and SO-8 footprint compatibility with automotive thermal and ESD requirements (±2 kV HBM).

Technical Context

The L5050SDTR integrates two independent p-channel MOSFET-based LDO regulators sharing one SO-8 package but with fully separated power paths: VS1/VO1/GND1 and VS2/VO2/GND2. Each channel features its own precision 2.5 V reference, current limiting, thermal shutdown, and dedicated enable logic with 800 mV hysteresis.

It supports dual-input configurations - either common input (VS1 = VS2) or split supply lines - and requires only 220 nF ceramic output capacitors per channel for stability across line/load transients. PSRR reaches 60 dB at 100 Hz, and output voltage remains stable under ±2% tolerance across 5.6–31 V input range and 5–100 mA load steps.

Key Specifications

Pinout & Package

SO-8 package with standard 1.27 mm pitch, ECOPACK® RoHS-compliant, 1.75 mm max height, and thermal resistance R_thJA = 94 °C/W (measured on 77 mm × 86 mm single-layer FR4 PCB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output automotive LDO applications.

Compared with TLE42744G and TPS7B8750QKVURQ1, L5050SDTR uniquely provides true electrical isolation between outputs, independent enable pins, and AEC-Q100 Grade 0 compliance in a single SO-8 package - essential for functional safety partitioning in modern automotive domains.

Availability

L5050SDTR is available at Aetrix Electronics and suitable for automotive body control modules, instrument clusters, ADAS camera systems, and telematics control units requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for L5050SDTR 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, specializing in automotive, industrial, and power management ICs with strong vertical integration and automotive quality systems.

L5050SDTR belongs to ST's automotive-grade linear regulator product line, engineered specifically for high-reliability, low-power, and thermally demanding vehicle subsystems where functional safety and supply resilience are critical.

FAQ

What is the maximum allowable input voltage for L5050SDTR?

The absolute maximum DC supply voltage is 40 V, validated per AEC-Q100 stress testing. Operation up to this level accommodates automotive load-dump transients without external protection. Sustained operation above 31 V may reduce output voltage accuracy and thermal margin; design guidance recommends 5.6–31 V for full specification compliance.

Can L5050SDTR operate with only one channel enabled?

Yes - EN1 and EN2 are fully independent. Disabling EN2 (driving it low) shuts down VO2 while VO1 remains active if EN1 is high. Quiescent current drops to 5 µA for the disabled channel only; total device I_qn becomes ~55 µA (50 µA for active channel + 5 µA for disabled channel), enabling flexible power sequencing.

What output capacitor value and type are required for stability?

A minimum 220 nF X7R ceramic capacitor with ESR ≥100 mΩ is required per output (VO1 and VO2), connected directly between pin and its respective GND (GND1 or GND2). Larger values (e.g., 470 nF–1 µF) improve transient response but do not affect stability if ESR stays within 100 mΩ–1 Ω range per the documented stability region.

Does L5050SDTR support split input supplies (VS1 ≠ VS2)?

Yes - the datasheet explicitly defines two independent input paths (VS1/VS2) with separate ground references (GND1/GND2). This allows connection to different battery branches (e.g., main 12 V and auxiliary 12 V) or isolated DC-DC outputs, enabling fault containment and redundancy in domain controller architectures.