Infineon Technologies TLE4473GV53NT

Overview

TLE4473GV53NT from Infineon Technologies is a dual low-dropout automotive voltage regulator IC with independent 3.3 V/300 mA (Q1) and 5 V/180 mA (Q2) outputs, integrated watchdog and dual reset generators, and -40 °C to 150 °C operation-designed for microcontroller core/I/O supply in engine control units.

For engineers reviewing the TLE4473GV53NT datasheet, TLE4473GV53NT pinout, TLE4473GV53NT application, or TLE4473GV53NT equivalent, key selection criteria include output voltage accuracy (±2% for 5 V, ±3% for 3.3 V), independent inhibit control (INH1/INH2), watchdog input (WI) timing dependency on D1 capacitance, and PG-DSO-12 thermal resistance (R_thj-a = 48 K/W with 600 mm² heatsink).

Technical Context

The TLE4473GV53NT integrates two LDO regulators with separate bandgap references, current-limiting, and thermal shutdown. Q1 delivers 3.3 V ±3% with programmable power-on reset delay and watchdog supervision via D1 capacitor and WI pin; Q2 provides 5 V ±2% with independent reset via D2 capacitor.

It features two open-collector reset outputs (RO1, RO2), dual inhibit inputs (INH1 disables both outputs, INH2 disables only Q2), and operates across 5.6–42 V input while maintaining regulation down to 100 mV dropout at full load-enabling robust start-stop and load-dump resilience in 12 V/24 V automotive systems.

Key Specifications

Pinout & Package

PG-DSO-12 package with exposed thermal pad (pin 6 and heatsink slug connected to GND); RoHS-compliant, lead-free, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70733PDRVR and MAX16910ATP+, the TLE4473GV53NT uniquely integrates dual independent reset outputs (RO1/RO2), true dual inhibit control (INH1/INH2), and PG-DSO-12 thermal performance-making it the only option qualified for ASIL-B dual-rail power management without supplemental ICs.

Availability

TLE4473GV53NT is available at Aetrix Electronics and suitable for engine control units, transmission control modules, body control modules, and ADAS camera ECUs requiring stable component supply across automotive production lifecycles.

Supply support for TLE4473GV53NT 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 global manufacturing and AEC-Q100 qualification infrastructure.

The TLE4473 product line delivers integrated dual-LDO regulators with supervision functions specifically for automotive microcontroller power domains-addressing start-stop, load-dump, and thermal challenges in powertrain and chassis ECUs.

FAQ

What is the maximum allowable capacitance on the D1 pin for watchdog timing?

The D1 pin supports external capacitors from 10 nF to 100 nF. At 100 nF, the maximum watchdog timeout (TWI,tr) reaches 42 ms per datasheet Equation (2). Larger values risk exceeding the internal voltage thresholds (VDU1/VDL1), causing unreliable reset assertion or missed watchdog pulses-capacitance beyond 100 nF is not characterized or guaranteed.

Can INH1 and INH2 be tied together for simultaneous control of both outputs?

Yes, INH1 and INH2 can be connected to the same control signal. When pulled low, INH1 disables both Q1 and Q2; INH2 then has no additional effect. This configuration simplifies power sequencing but eliminates independent Q2 disable capability-use only when hierarchical power gating is unnecessary.

Is the RO1 pin compatible with 3.3 V logic-level microcontrollers?

RO1 is an open-collector output rated for 18 V max and designed to interface with external pull-up resistors. When used with a 3.3 V pull-up, RO1 asserts low at ≤0.4 V (typical), meeting standard CMOS input low threshold. No level-shifting is required for direct connection to 3.3 V MCU GPIO pins configured as interrupt inputs.

Does the TLE4473GV53NT support reverse-battery protection?

The device withstands reverse input voltage down to -42 V per absolute maximum ratings, but does not actively block reverse current. External protection (e.g., series Schottky diode or ideal diode controller) is required to prevent battery drain or damage during reverse connection-this is consistent with AEC-Q100 Class 0 automotive regulator design practice.