Infineon Technologies TLS203B0LDV50XUMA1

Overview

TLS203B0LDV50XUMA1 from Infineon Technologies is an AEC-Q100-qualified automotive-grade linear voltage regulator delivering a fixed 5.0 V output at up to 300 mA, with 290 mV dropout, 42 µV_RMS output noise (10 Hz–100 kHz), and 30 µA quiescent current. It serves as a low-noise post-regulator in battery-powered vehicle subsystems such as body control modules and infotainment power rails.

For engineers reviewing the TLS203B0LDV50XUMA1 datasheet, TLS203B0LDV50XUMA1 pinout, TLS203B0LDV50XUMA1 application, or TLS203B0LDV50XUMA1 equivalent, key selection criteria include its AEC-Q100 qualification, reverse polarity protection, Kelvin sense capability, and stability with ≥3.3 µF ceramic output capacitors without ESR requirements.

Technical Context

This LDO employs a precision bandgap reference and error amplifier with internal saturation control and thermal shutdown circuitry. Its architecture supports Kelvin sensing via dedicated SENSE pin to compensate for PCB trace IR drop, enabling tight regulation at remote loads.

The device integrates reverse-battery protection, overcurrent limiting, and reverse-current blocking-eliminating external diodes. Input voltage range spans 5.5 V to 20 V, with internal operation functional down to 2.3 V input, supporting cold-crank scenarios in 12 V automotive systems.

Key Specifications

Pinout & Package

Delivered in PG-DSO-8 exposed-pad package (RoHS-compliant, green product), with thermal pad (Pin 9) requiring solder connection to PCB ground for optimal thermal performance (R_thJA = 52 K/W with 600 mm² heatsink).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise automotive LDO applications.

Compared with TLE4274G V50 and TLV73350PDBVR, TLS203B0LDV50XUMA1 uniquely combines AEC-Q100 Grade 1 qualification, Kelvin sensing, sub-1 µA shutdown, and 42 µV_RMS noise-making it the only choice for production automotive systems demanding simultaneous safety, precision, and ultra-low power.

Availability

TLS203B0LDV50XUMA1 is available at Aetrix Electronics and suitable for automotive body electronics, infotainment systems, and telematics applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for TLS203B0LDV50XUMA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in AEC-Q100-qualified analog products.

This device belongs to the OPTIREG™ linear regulator family, engineered specifically for robust, low-noise power delivery in automotive environments-including cold-crank, load-dump, and reverse-battery fault conditions.

FAQ

What is the minimum output capacitance required for stability?

The TLS203B0LDV50XUMA1 is stable with a minimum 3.3 µF ceramic output capacitor when no bypass capacitor is used on the BYP pin. If a 10 nF BYP capacitor is added, the minimum recommended output capacitance increases to 6.8 µF. The device does not require any minimum ESR, enabling use of low-ESR ceramic capacitors without series resistors.

How does the Kelvin sense feature improve regulation accuracy?

The SENSE pin connects directly to the load side of PCB traces, feeding the error amplifier with the true load voltage rather than the regulator output (Q). This eliminates regulation error caused by voltage drop across trace resistance-e.g., a 100 mΩ trace carrying 300 mA would cause 30 mV error without Kelvin sensing, but is fully compensated when SENSE is routed to the load.

Can the TLS203B0LDV50XUMA1 withstand reverse battery connection?

Yes-the device includes integrated reverse-battery protection. When input (I) is at −12 V relative to GND, internal circuitry blocks current flow from output (Q) to input (I), preventing reverse current and protecting both the regulator and downstream circuitry. No external diode is required, avoiding forward voltage drop and associated power loss.

Is an input capacitor mandatory?

An input capacitor is required if the regulator is placed more than 15 cm from the main system filter capacitor or if significant input inductance exists (e.g., long harnesses). For battery-powered automotive applications, a 1–10 µF ceramic capacitor at the I pin is recommended to suppress high-frequency impedance rise and ensure stable operation during cranking events.