Infineon Technologies TLS203B0LDV33XUMA1

Overview

TLS203B0LDV33XUMA1 from Infineon Technologies is a fixed-output (3.3 V), AEC-Q100-qualified linear voltage regulator in PG-DSO-8 exposed-pad package, delivering 300 mA with 270 mV dropout, 24 µVRMS output noise (10 Hz–100 kHz), and 30 µA quiescent current. It serves as a low-noise post-regulator in automotive battery-powered systems requiring stable 3.3 V supply under wide input (3.8–20 V) and harsh thermal conditions.

For engineers reviewing the TLS203B0LDV33XUMA1 datasheet, TLS203B0LDV33XUMA1 pinout, TLS203B0LDV33XUMA1 application, or TLS203B0LDV33XUMA1 equivalent, key selection criteria include automotive qualification status, reverse polarity protection, Kelvin sense capability for load regulation, stability with ≥3.3 µF ceramic output capacitors, and shutdown current <1 µA.

Technical Context

The TLS203B0LDV33XUMA1 implements a micropower bandgap reference with error amplifier feedback to Q and SENSE pins, enabling precise 3.3 V regulation across –40°C to +125°C junction temperature. Its internal saturation control and thermal shutdown circuitry activate at T_j ≥ 150°C, while overcurrent protection limits output current to prevent latch-up.

Reverse battery protection is achieved via intrinsic diode behavior between I and GND, eliminating external diodes; no reverse current flows from Q to I during input reversal. The BYP pin supports external 10 nF capacitor connection to reduce reference noise, directly lowering integrated output noise to 24 µVRMS.

Key Specifications

Pinout & Package

Package: PG-DSO-8 exposed-pad (RoHS-compliant, green product), with thermal pad (Pin 9) requiring solder connection to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PDBVR and TPS78533QWDRBRQ1, TLS203B0LDV33XUMA1 uniquely combines AEC-Q100 qualification, Kelvin sense, and 24 µVRMS noise in a thermally optimized DSO-8 package - making it optimal for safety-critical, space-constrained automotive post-regulation where load regulation accuracy and fault resilience are mandatory.

Availability

TLS203B0LDV33XUMA1 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, telematics control units, and electric power steering ECUs requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for TLS203B0LDV33XUMA1 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 ICs, and security solutions, with global manufacturing and automotive qualification infrastructure.

TLS203B0LDV33XUMA1 belongs to the OPTIREG™ linear voltage regulator product line, designed specifically for robust, low-noise power delivery in automotive electronic control units operating under extreme voltage transients and temperature ranges.

FAQ

Is TLS203B0LDV33XUMA1 pin-compatible with other Infineon TLS203 variants?

No - TLS203B0LDV33XUMA1 uses the fixed-output SENSE pin configuration (Pin 2), whereas the adjustable TLS203B0EJV uses ADJ on Pin 2. Though both share PG-DSO-8 package and pin numbering, SENSE and ADJ are functionally incompatible; direct substitution requires PCB redesign and schematic validation.

Can TLS203B0LDV33XUMA1 operate with a 2.5 V input?

No - the minimum functional input voltage is 3.8 V for the fixed 3.3 V version. Below this, regulation fails due to insufficient headroom for the 270 mV dropout and internal bias circuitry, which requires ≥2.3 V to remain active but cannot sustain output regulation at V_I < 3.8 V.

What is the maximum allowable output capacitance?

There is no upper limit specified - stability is guaranteed for C_Q ≥ 3.3 µF (with CBYP = 0 nF) or ≥6.8 µF (with 0 < CBYP ≤ 10 nF). Larger values (e.g., 47 µF ceramic) improve transient response and are commonly used in automotive designs without risk of oscillation.

Does the SENSE pin require a dedicated PCB trace?

Yes - for Kelvin sensing to function correctly, the SENSE trace must run separately from the Q output trace and connect directly to the load's 3.3 V input node. Sharing the same copper pour or trace with Q defeats the purpose and re-introduces IR drop error into regulation.