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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Infineon Technologies TLE4473G V52

Name: TLE4473G V52
Brand: Infineon Technologies
SKU: TLE4473G V52
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLE4473G V52

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 12-BSOP (0.295", 7.50mm Width) Exposed Pad

Datasheet:: TLE4473G V52.pdf

Description:: IC REG LINEAR 2.6V/5V DSO12-6

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TLE4473G V52 from Infineon Technologies is a dual low-dropout voltage regulator IC for automotive microcontroller and sensor power supply, delivering 300 mA at 2.6 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 TLE4473G V52 datasheet, TLE4473G V52 pinout, TLE4473G V52 application, or TLE4473G V52 equivalent, key selection considerations include output voltage configuration (2.6 V/5 V vs. 3.3 V/5 V), watchdog timing dependency on D1 capacitor value, reset delay adjustability per channel, and PG-DSO-12 thermal performance under 150 °C junction operation.

Technical Context

The TLE4473G V52 integrates two LDO regulators with separate enable logic (INH1 disables both outputs; INH2 disables only Q2), each with dedicated reset generation (RO1 for Q1 with integrated watchdog; RO2 for Q2). It operates from 5.6 V to 42 V input and maintains regulation down to < 0.5 V dropout at full load.

Its watchdog circuit monitors WI (positive-edge triggered) to sustain RO1 high; absence of pulses discharges D1 capacitor until VDL1 is reached, asserting reset. Reset delays for both channels are set externally via capacitors on D1 and D2, enabling programmable power-on timing and fault recovery windows.

Key Specifications

Parameter	Value and Actual Design Meaning
Q1 Output Voltage	2.6 V ±3% - fixed core supply for 2.6 V microcontrollers or ASICs requiring tight tolerance
Q2 Output Voltage	5.0 V ±2% - stable I/O or sensor interface rail tolerant of automotive load dump transients
Max Output Current	Q1: 300 mA; Q2: 180 mA - sufficient for MCU core + peripheral clusters without external boost
Quiescent Current	< 1 µA with both outputs disabled - enables ultra-low-power sleep mode in always-on vehicle modules
Operating Input Range	5.6 V to 42 V - supports cold-crank (5.6 V) and load-dump (42 V) conditions per ISO 7637-2
Junction Temp Range	−40 °C to +150 °C - qualified for under-hood placement without derating
Dropout Voltage	< 0.5 V at full load - minimizes power loss and heat generation in high-ambient environments

Pinout & Package

Package: PG-DSO-12 (exposed thermal pad, RoHS-compliant, lead-free, moisture sensitivity level 3).

Pin/Terminal	Circuit Role	Design Meaning
1 WI	Watchdog input	Positive-edge-triggered signal from MCU to prevent RO1 reset assertion during normal operation
2 RO2	Reset output for Q2	Open-collector output asserting low when Q2 voltage falls below VRT2 or D2 capacitor discharges
3 RO1	Reset & watchdog output for Q1	Open-collector output combining power-on reset and watchdog timeout detection for MCU core supply
4 Q2	Main 5 V output	Regulated 5 V rail requiring ≥22 µF/ESR <5 Ω ceramic or tantalum bulk capacitance
5 Q1	Core 2.6 V output	Regulated 2.6 V rail requiring ≥10 µF/ESR <5 Ω bulk capacitance for digital core stability
6 N.C.	No connect	Internally unused; must be connected to GND for mechanical and thermal integrity
7 I	Input voltage	High-voltage input (5.6–42 V); requires local ceramic decoupling directly at pin
8 INH1	Inhibit 1	Active-low global disable: pulls both Q1 and Q2 into standby (<1 µA IQ)
9 INH2	Inhibit 2	Active-low Q2-only disable - enables selective shutdown of I/O rail while retaining core power
10 D2	Reset delay 2	Capacitor connection point setting Q2 reset delay time (t_D2 ∝ C_D2)
11 D1	Reset delay 1 / watchdog timing	Capacitor connection point setting Q1 reset delay and maximum watchdog pulse interval (t_WI,tr = 0.42 ms/nF × C_D1)
12 GND	Ground / heatsink	Power and signal reference; exposed pad must be soldered to PCB ground plane for thermal conduction

Key Features

Feature	Design Value
Dual independent inhibit inputs	INH1 globally disables both outputs; INH2 selectively disables only Q2 - enabling flexible power sequencing in multi-rail systems
Integrated watchdog on Q1	Monitors MCU activity via WI pin; asserts RO1 low if no edge occurs within programmable window - prevents lockup without external timer
Two adjustable reset outputs	RO1 and RO2 each driven by separate RC networks (D1/D2 pins) - allows asymmetric reset timing for core vs. I/O domains
Short-circuit & overtemperature protection	Auto-recovering foldback current limiting and thermal shutdown at ~175 °C - sustains reliability during sustained overload or cooling failure
Automotive-grade thermal design	R_thj-a = 48 K/W with 300 mm² copper heatsink - supports continuous 150 °C junction operation in constrained enclosures

Applications

Engine Control Unit (ECU)

Body Control Module (BCM)

Use Scenario: Powering 2.6 V MCU core and 5 V CAN transceiver/sensor interface in diesel ECU under wide temperature and voltage stress.

IC Role / Device Role / Timing Role: Primary dual-rail power source with watchdog-enforced MCU liveness monitoring and independent reset signaling for safety-critical firmware execution.

Use Value: Eliminates need for discrete reset IC and external watchdog timer; reduces BOM count while meeting ASIL-B functional safety requirements via built-in diagnostics.

Use Scenario: Supplying door module MCU and LIN transceiver in ambient temperature-cycled passenger compartment.

IC Role / Device Role / Timing Role: Dual-output regulator with selective inhibit (INH2) to shut down 5 V I/O rail during sleep while maintaining 2.6 V core retention.

Use Value: Achieves sub-µA system standby current via coordinated inhibit control - extends battery life in parked vehicle scenarios.

Transmission Control Unit (TCU)

Advanced Driver Assistance System (ADAS) Camera ECU

Use Scenario: Regulating power for transmission solenoid driver MCU and analog sensor front-end in high-vibration, high-heat gearbox environment.

IC Role / Device Role / Timing Role: High-temperature-stable dual LDO with overtemperature shutdown and short-circuit protected outputs - ensures fail-safe power delivery during thermal stress events.

Use Value: Maintains regulation up to 150 °C junction temperature without derating - avoids thermal throttling or unexpected resets during prolonged highway operation.

Use Scenario: Powering image signal processor (ISP) core (2.6 V) and serializer interface (5 V) in rear-view camera module mounted near exhaust.

IC Role / Device Role / Timing Role: Dual-rail regulator with independent reset outputs (RO1/RO2) enabling staggered power-up sequencing for ISP initialization before serializer handshake.

Use Value: Programmable reset delays (via D1/D2 caps) ensure reliable boot order - prevents ISP lockup due to premature serializer clock activation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV70733PDQNR	Single 3.3 V output (300 mA), no 5 V rail, no watchdog, no dual reset - lacks Q2 functionality and supervision features	Suitable only for single-rail 3.3 V systems without safety monitoring	Select only if application requires only one regulated rail and no functional safety features
TLE42744G V33	Dual 5 V outputs (500 mA + 150 mA), no 2.6 V option, no watchdog, RO1/RO2 present but no WI pin - missing core-supply-specific supervision	Applicable where both rails must be 5 V (e.g., legacy sensor clusters), but cannot replace 2.6 V core requirement	Choose when dual 5 V regulation suffices and watchdog is not required for MCU supervision

Compared with TLV70733PDQNR and TLE42744G V33, the TLE4473G V52 uniquely delivers matched 2.6 V/5 V outputs with integrated watchdog and dual independent reset - making it irreplaceable for new automotive MCU designs requiring ASIL-aware power management.

Availability

TLE4473G V52 is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across extended automotive temperature and voltage ranges.

Supply support for TLE4473G V52 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 broad automotive qualification and AEC-Q100 compliance leadership.

The TLE4473 product line delivers integrated dual-LDO power management ICs designed specifically for demanding automotive ECU applications - combining regulation, reset, and watchdog functions in a single PG-DSO-12 package.

FAQ

What is the function of the WI (Watchdog Input) pin?

The WI pin accepts positive-edge-triggered pulses from the MCU to reset the internal watchdog timer. If no edge occurs within the programmable window (set by capacitor on D1), the RO1 output asserts low, signaling a system fault. This prevents MCU lockup without requiring an external timer IC.

How does the INH1 and INH2 pin logic differ?

INH1 is an active-low global inhibit: pulling it low disables both Q1 and Q2 outputs simultaneously, reducing quiescent current to <1 µA. INH2 is an active-low Q2-only inhibit: it disables only the 5 V output while leaving Q1 (2.6 V) active - enabling selective power-down of I/O peripherals during sleep modes.

Can the TLE4473G V52 be used outside automotive applications?

Yes, but its design targets automotive requirements: wide input range (5.6–42 V), −40 °C to +150 °C operation, and robust protection features. In industrial applications with similar voltage/thermal stress - such as railway control or off-highway machinery - it provides proven reliability, though non-automotive users should verify AEC-Q100 test reports for their specific use case.

What capacitor values are recommended for D1 and D2 to achieve standard reset delays?

For a typical 100 ms power-on reset delay on Q1 (RO1), use 220 nF on D1; for 100 ms on Q2 (RO2), use 220 nF on D2. These values align with the formula t_D = (VDU − VDL) × C / IDC, where IDC1 = IDC2 ≈ 10 µA per datasheet. Always validate timing with actual board layout parasitics and temperature variation.

TLE4473G V52 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: OPTIREG™

Package/Case:: 12-BSOP (0.295", 7.50mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 2

Voltage - Input (Max):: 42V

Voltage - Output (Min/Fixed):: 2.6V, 5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -, 0.6V @ 100mA

Current - Output:: 300mA, 180mA

Current - Quiescent (Iq):: 265 µA

Current - Supply (Max):: 20 mA

PSRR:: 65dB (100Hz), 65dB (100Hz)

Control Features:: Inhibit, Reset, Watchdog

Protection Features:: Over Current, Over Temperature, Short Circuit, Transient Voltage

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: P-DSO-12-6

TLE4473G V52 FAQ

1.How can I place an order for TLE4473G V52 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLE4473G V52 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TLE4473G V52 reliable?

The price and inventory of TLE4473G V52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4473G V52 is usually 5 days.

3.What payment methods are accepted for TLE4473G V52?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4473G V52 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLE4473G V52?

TLE4473G V52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLE4473G V52 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TLE4473G V52?

For technical support, including TLE4473G V52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4473G V52 requirements.

6.How does Aetrix verify that TLE4473G V52 is sourced from the original manufacturer or authorized distributors?

All TLE4473G V52 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLE4473G V52 meets industry standards.

7.What is the process for return or replacement of TLE4473G V52?

All TLE4473G V52 units undergo pre-shipment inspection (PSI). If there is an issue with TLE4473G V52, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TLE4473G V52 part is unused and in its original packaging.

Return procedure for TLE4473G V52:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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