Infineon Technologies TLS208D1LDV33XUMA1

Overview

TLS208D1LDV33XUMA1 from Infineon Technologies is a fixed-output (3.3 V), AEC-Q100 qualified linear voltage post regulator for automotive DC-DC cascaded power systems. It delivers up to 800 mA output current with ±2 % output accuracy, 400 mV typical dropout at 400 mA, and operates across 2.7–18 V input range. Used as a secondary regulator after buck converters in engine control units and ADAS domain controllers.

For engineers reviewing the TLS208D1LDV33XUMA1 datasheet, TLS208D1LDV33XUMA1 pinout, TLS208D1LDV33XUMA1 application, or TLS208D1LDV33XUMA1 equivalent, key selection criteria include reset threshold adjustability, PSRR of 62 dB at 10 kHz, thermal shutdown behavior, and PG-TSON10 package thermal resistance (R_thJA = 57 K/W on 2s2p board).

Technical Context

The TLS208D1LDV33XUMA1 integrates a precision bandgap reference, current-limiting driver, and thermal shutdown circuit within a monolithic silicon die. Its reset function uses an external resistor divider on RADJ to set threshold between 0.8 V and 5.25 V, while the open-collector RO pin asserts low during undervoltage or power-on delay.

Designed specifically for post-regulation in automotive environments, it features internal protection against short-circuit, overtemperature, and reverse-polarity conditions. The FB pin is internally connected to Q for fixed 3.3 V operation, eliminating external feedback components required in adjustable variants.

Key Specifications

Pinout & Package

Package: PG-TSON10 (3 mm × 3 mm, 0.65 mm pitch, exposed thermal pad). Optimized for high-power density automotive PCBs with mandatory solder connection of EP pad to internal GND plane and thermal copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear post-regulator applications.

Compared with TLV73333PDBVR and TPS7B8733QKVURQ1, TLS208D1LDV33XUMA1 uniquely balances 800 mA capability, programmable reset, and PG-TSON10 thermal performance-making it optimal for AEC-Q100-compliant ECUs needing robust post-regulation without external supervision logic.

Availability

TLS208D1LDV33XUMA1 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and infotainment head units requiring stable component supply across automotive production lifecycles.

Supply support for TLS208D1LDV33XUMA1 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 qualification infrastructure.

The TLS208D1 product line targets automotive post-regulation in harsh environments, delivering high-accuracy, fault-resilient linear regulation after primary DC-DC converters in safety-critical electronic control units.

FAQ

What is the purpose of the RADJ pin on TLS208D1LDV33XUMA1?

The RADJ pin sets the reset threshold voltage via an external resistor divider between Q (3.3 V) and GND. For example, a 100 kΩ/220 kΩ divider yields ~2.28 V threshold, triggering RO low when input sags below that level. This enables precise brown-out detection aligned with downstream MCU voltage tolerances, unlike fixed-threshold alternatives.

Can TLS208D1LDV33XUMA1 operate with input voltage below 2.7 V?

No. The absolute minimum functional input voltage is 2.7 V per the datasheet's Functional Range (Table 2). Operation below this violates specification and may cause unregulated output or undefined reset behavior. During cold-crank events, battery voltage must be conditioned to stay ≥2.7 V at the I pin, typically via upstream buck converter hold-up design.

Is the exposed pad (EP) electrically connected to GND?

Yes. The exposed pad is internally connected to the GND terminal and must be soldered to a low-impedance PCB ground plane with ≥6 thermal vias. This connection is mandatory for both electrical functionality (current return path) and thermal performance-R_thJA degrades from 57 K/W to >170 K/W if EP is left unconnected.

Does TLS208D1LDV33XUMA1 require an external capacitor on the FB pin?

No. As a fixed-output variant (3.3 V), the FB pin is internally connected to Q. No external resistors or capacitors are needed on ADJ/FB. External components are only required on RADJ (for reset threshold) and RO (pull-up resistor), per the application diagram in Section 9.2 of the datasheet.