Infineon Technologies TLE4473GV53AUMA1

Overview

TLE4473GV53AUMA1 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 requiring robust 12 V/24 V battery-fed regulation.

For engineers reviewing the TLE4473GV53AUMA1 datasheet, TLE4473GV53AUMA1 pinout, TLE4473GV53AUMA1 application, or TLE4473GV53AUMA1 equivalent, key selection criteria include output voltage accuracy, watchdog timing programmability via external capacitor D1, independent inhibit logic for Q1/Q2, and thermal performance under -40 °C to 150 °C junction temperature operation.

Technical Context

The TLE4473GV53AUMA1 integrates two LDO regulators with separate bandgap references and current-limiting saturation control circuits. Q1 (3.3 V) includes a programmable power-on reset delay and edge-triggered watchdog input (WI), while Q2 (5 V) provides a dedicated reset output (RO2) with adjustable delay via capacitor D2.

Both outputs feature open-collector reset outputs (RO1, RO2), independent inhibit inputs (INH1, INH2), and protection against short circuit, overload, and overtemperature. The device operates across 5.6–42 V input range with quiescent current <1 µA when both outputs are disabled.

Key Specifications

Pinout & Package

Package: PG-DSO-12 (exposed thermal pad, RoHS-compliant, surface-mount). Pin 6 and heat slug must be connected to GND for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70733PDPKR and MAX16910ATP+, the TLE4473GV53AUMA1 uniquely combines dual-rail regulation, programmable watchdog/reset timing, and automotive-grade protection in a single PG-DSO-12 package - enabling consolidated safety-critical power architecture without external supervision components.

Availability

TLE4473GV53AUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering control units requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLE4473GV53AUMA1 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 products.

The TLE4473 product line delivers integrated dual-LDO regulators with safety features for automotive microcontroller power domains - designed specifically to replace discrete regulator + supervisor + watchdog solutions in ECU designs.

FAQ

What is the minimum input voltage required for regulation on both outputs?

The TLE4473GV53AUMA1 requires a minimum input voltage of 5.6 V to regulate both Q1 (3.3 V) and Q2 (5 V) outputs simultaneously. Below this threshold, regulation is not guaranteed, and output voltages may drop out of specification. This ensures compatibility with degraded 12 V battery conditions down to ~6 V during cranking.

How is watchdog timeout determined, and can it be adjusted independently of power-on reset delay?

Watchdog timeout and power-on reset delay share the same external capacitor on pin D1, but are governed by different internal currents (IDC1 for charging, IDD1 for discharging). The timeout is calculated as (VDU1 − VDL1)/IDD1, while reset delay is (VDU1 − VDL1)/IDC1 - allowing independent adjustment via capacitor value and internal current ratios.

Does the TLE4473GV53AUMA1 support reverse battery protection?

No, the TLE4473GV53AUMA1 does not integrate reverse battery protection. It requires external protection - typically a series Schottky diode or MOSFET-based ideal diode circuit - on the input (pin 7) to prevent damage from -42 V reverse polarity events per absolute maximum ratings.

What is the recommended PCB layout practice for thermal performance?

For optimal thermal performance, the exposed thermal pad (pins 6 and heat slug) must be soldered to a minimum 300 mm² copper pour connected to the GND plane using ≥6 thermal vias (0.3 mm diameter). This achieves R_thj-a ≈ 60 K/W; larger copper area (600 mm²) further reduces it to 48 K/W per datasheet test conditions.