Infineon Technologies TLE4473GV53AUMA2

Overview

TLE4473GV53AUMA2 from Infineon Technologies is a dual low-dropout voltage regulator IC for automotive microcontroller power supply, delivering 300 mA at 3.3 V (±3%) on Q1 and 180 mA at 5 V (±2%) on Q2, with independent inhibit control, watchdog supervision on Q1, and dual reset outputs - deployed in engine control units and body electronics.

For engineers reviewing the TLE4473GV53AUMA2 datasheet, TLE4473GV53AUMA2 pinout, TLE4473GV53AUMA2 application, or TLE4473GV53AUMA2 equivalent, key selection criteria include output voltage accuracy, watchdog timing programmability via external capacitor D1, independent enable/disable logic per channel, and operation across -40 °C to 150 °C junction temperature.

Technical Context

The TLE4473GV53AUMA2 integrates two LDO regulators with separate bandgap references, thermal shutdown, short-circuit protection, and overload detection. Each output features dedicated reset generation with adjustable delay via external capacitors D1 (Q1) and D2 (Q2), and Q1 includes a positive-edge-triggered watchdog input (WI) that resets RO1 if pulses are missed beyond TWI,tr.

Its PG-DSO-12 package supports PCB heatsinking (Rthj-a = 48 K/W at 600 mm² copper), enabling stable operation up to 42 V input while maintaining <1 µA quiescent current in full disable mode - critical for automotive always-on domains requiring ultra-low standby power.

Key Specifications

Pinout & Package

PG-DSO-12 package with exposed heat slug (pin 6 and slug must be connected to GND). Thermal resistance Rthj-a = 48 K/W with 600 mm² copper pour, supporting high ambient temperature operation.

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 MAX16922ATP/V+T, the TLE4473GV53AUMA2 uniquely integrates watchdog supervision, dual programmable reset outputs, and automotive-grade protection in a single PG-DSO-12 package - reducing component count and validation effort for ASIL-B-compliant power domains.

Availability

TLE4473GV53AUMA2 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera ECUs requiring stable component supply under extended temperature and harsh electrical environments.

Supply support for TLE4473GV53AUMA2 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 and mixed-signal solutions.

The TLE4473 product line delivers integrated dual-LDO regulators with system supervision for automotive microcontroller power domains - designed specifically to replace discrete regulator + reset + watchdog combinations in ECU designs.

FAQ

What is the function of the WI pin?

The WI (Watchdog Input) pin is a positive-edge-triggered input that monitors MCU firmware liveness. When a rising edge occurs, it recharges capacitor CD1 to prevent RO1 reset assertion. If no edge is detected within the programmed watchdog timeout (TWI,tr), CD1 discharges and RO1 goes low, initiating a system reset - ensuring fail-safe behavior during software lockup.

Can INH1 and INH2 be used simultaneously for power sequencing?

Yes. INH1 (global inhibit) and INH2 (Q2-only inhibit) can be controlled independently to sequence power-up/down: e.g., assert INH2 low first to disable Q2 while keeping Q1 active for MCU initialization, then release INH2 after peripherals are ready. This avoids simultaneous rail collapse and ensures deterministic boot order.

How is the reset delay time set for Q1 and Q2?

Reset delay for Q1 is set by capacitor CD1 on pin D1; for Q2, by capacitor CD2 on pin D2. Charging current IDC1 (1.2 µA) and IDC2 determine delay via tD = (VDU – VDL)/IDC × CD. For example, 100 nF on D1 yields ~100 ms POR delay. Datasheet Equation (1) defines exact timing based on capacitor value and internal current sources.

Is the PG-DSO-12 package thermally sufficient for 150 °C operation?

Yes. With 600 mm² copper heatsink area on FR4 PCB, the PG-DSO-12 achieves Rthj-a = 48 K/W. At max load (300 mA @ 3.3 V + 180 mA @ 5 V) and 42 V input, power dissipation remains ≤1.8 W, resulting in <86 °C junction rise above ambient - well within the -40 °C to 150 °C rating even at 85 °C ambient.