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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Infineon Technologies TLD5085EJFUMA1

Name: TLD5085EJFUMA1
Brand: Infineon Technologies
SKU: TLD5085EJFUMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLD5085EJFUMA1

Manufacturer:: Infineon Technologies

Category:: LED Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TLD5085EJFUMA1.pdf

Description:: IC LED DRVR RGLTR PWM 1.8A 8DSO

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Product details

Overview

TLD5085EJFUMA1 from Infineon is an automotive-grade DC/DC step-down LED driver IC with integrated 1.8A power switch, operating from 4.75V to 45V input, delivering constant current (±2% tolerance) or constant voltage regulation in buck topology, and featuring PWM dimming, internal soft-start, and overtemperature shutdown - used in dome lights, dashboard backlighting, and reading lamps.

For engineers reviewing the TLD5085EJFUMA1 datasheet, TLD5085EJFUMA1 pinout, TLD5085EJFUMA1 application, or TLD5085EJFUMA1 equivalent, key selection criteria include its AEC-Q100 qualification, 370 kHz fixed switching frequency, exposed-pad DSO-8 thermal design, enable-controlled 0.1 µA shutdown current, and FB-based current-sense resistor configuration for LED current setting.

Technical Context

The TLD5085EJFUMA1 implements a synchronous buck controller architecture with integrated high-side N-channel MOSFET, using voltage-mode control with external compensation via COMP pin. It supports both constant-current (for LED string regulation) and constant-voltage modes via configurable FB network.

Its oscillator runs at a fixed 370 kHz, enabling compact magnetics and low EMI; thermal shutdown triggers at 150°C junction temperature, and the integrated charge pump drives the high-side switch without external bootstrap components beyond the BDS–BUO capacitor.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.75 V to 45 V - supports full automotive battery range including cold-crank and load-dump transients.
Max Output Current	1.8 A - continuous output current capability with integrated power switch, no external FET required.
Switching Frequency	370 kHz - fixed frequency enables predictable EMI filtering and use of small, cost-effective inductors (18–56 µH).
Current Regulation Accuracy	±2% at nominal load - ensures tight LED brightness consistency and color stability across units and temperature.
Shutdown Current	0.1 µA typical - ultra-low quiescent consumption meets automotive always-on system requirements.
Junction Temp Limit	150 °C - thermal shutdown protects device during overload or poor heatsinking; R_thJC = 10 K/W enables direct pad-to-heatsink conduction.
PWM Dimming Input	Logic-level PWMI pin - accepts 0–5 V signal for precise analog-compatible LED brightness control without external circuitry.

Pinout & Package

Package: PG-DSO-8 (e-Pad), thermally enhanced SOIC-8 variant with exposed copper pad (EP) for direct PCB heatsinking and low-inductance GND connection.

Pin/Terminal	Circuit Role	Design Meaning
PWMI (1)	PWM dimming input	Accepts logic-level signal (0–5 V) to modulate LED current; unused must be tied to VS.
GND (2)	Power and signal reference	Main ground return for all internal circuits and EP thermal path; requires low-impedance PCB plane connection.
COMP (3)	Loop compensation node	Connects external RC network to stabilize voltage-mode control loop; critical for transient response and stability.
FB (4)	Feedback sensing input	Senses voltage across current-sense resistor (R_FB = 0.6 V / I_LED) to regulate LED current precisely.
BDS (5)	Bootstrap supply input	Connects bootstrap capacitor between BDS and BUO to gate-drive the integrated high-side switch.
BUO (6)	Buck switch output	High-side switch source terminal; connects directly to inductor and freewheeling diode cathode.
EN (7)	Enable control input	Active-high logic input; internal pull-down allows default disable; enables ultra-low shutdown current.
VS (8)	Main supply input	Primary power rail input (4.75–45 V); decoupling capacitor required near pin for noise suppression.
EP	Exposed thermal pad	Electrically connected to GND; must be soldered to large copper area for thermal dissipation and EMI reduction.

Key Features

Feature	Design Value
AEC-Q100 Qualified	Grade 1 (−40°C to +125°C ambient) - validated for under-hood automotive lighting applications.
Integrated Power Switch	1.8 A rated N-channel MOSFET - eliminates external high-side switch and associated gate-drive complexity.
Constant Current Mode	±2% accuracy at nominal load - maintains consistent LED luminance and chromaticity across line/load/temperature variations.
Soft-Start Function	Internal ramp generator - prevents inrush current and output voltage overshoot during startup, protecting LEDs and passives.
Thermal Protection	Auto-restart after junction cooldown - latches off above 150°C and resumes operation once safe temperature is restored.

Applications

Automotive Dome Lighting

Dashboard Backlighting

Use Scenario: Interior cabin lighting requiring reliable, flicker-free illumination with adjustable brightness.

IC Role / Device Role / Timing Role: Constant-current LED driver regulating multiple parallel LED strings in buck topology.

Use Value: ±2% current accuracy ensures uniform light output across vehicle lifetime; 0.1 µA shutdown current preserves battery during extended parking.

Use Scenario: TFT-LCD or segmented display backlighting in instrument clusters with variable ambient light conditions.

IC Role / Device Role / Timing Role: PWM-dimmable constant-current source synchronized to microcontroller commands for dynamic contrast control.

Use Value: 370 kHz switching avoids audible noise; wide 4.75–45 V input handles stop-start and load-dump events without dropout.

Reading Light Modules

Center Console Illumination

Use Scenario: Occupant-focused task lighting with on/off and dimming controlled via vehicle CAN or local switch.

IC Role / Device Role / Timing Role: Enable-controlled buck regulator driving high-brightness white LEDs with soft-start for smooth turn-on.

Use Value: Integrated EN pin and internal pull-down simplify interface; exposed pad ensures thermal reliability in confined plastic housings.

Use Scenario: Ambient lighting in center stack and cupholder areas requiring low-profile, thermally robust solutions.

IC Role / Device Role / Timing Role: Constant-voltage mode configured via FB divider to power RGB LED drivers or smart lighting modules.

Use Value: Adjustable 0.6–16 V output range supports diverse downstream loads; AEC-Q100 qualification guarantees field durability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED buck driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862SP-13	Fixed 500 kHz frequency; lower max current (1.2 A); no integrated soft-start.	Targeted at non-automotive general lighting; lacks AEC-Q100 qualification.	Choose for cost-sensitive industrial lighting where automotive reliability and 1.8 A drive are not required.
LM3409QMY/NOPB	Adjustable frequency (200–2000 kHz); external MOSFET required; ±5% current accuracy.	Supports higher-power designs via discrete FET selection; wider thermal margin but larger BOM.	Prefer when flexible frequency tuning or >1.8 A output is needed, accepting added layout and component complexity.

Compared with AL8862SP-13 and LM3409QMY/NOPB, the TLD5085EJFUMA1 delivers superior integration (integrated 1.8 A switch, soft-start, AEC-Q100), tighter current accuracy, and optimized thermal performance in a single DSO-8 package - making it the preferred choice for space-constrained, safety-critical automotive LED systems.

Availability

TLD5085EJFUMA1 is available at Aetrix Electronics and suitable for automotive dome lighting, dashboard backlighting, and reading lamp modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TLD5085EJFUMA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and security solutions, with global manufacturing and R&D infrastructure.

The LITIX™ Power product line targets automotive LED lighting systems, delivering highly integrated, AEC-Q100-qualified DC/DC drivers optimized for reliability, thermal efficiency, and functional safety in harsh vehicular environments.

FAQ

What is the recommended external inductor value for TLD5085EJFUMA1?

The datasheet specifies an inductor range of 18 µH to 56 µH for stable operation. A 33 µH shielded power inductor with ≥2.5 A saturation current is commonly used to balance size, ripple current (<30% of I_OUT), and thermal performance in automotive dome light designs.

How is LED current set using the FB pin?

LED current is set by connecting a precision current-sense resistor (R_FB) between FB and GND, sized as R_FB = 0.6 V / I_LED. For example, a 300 mA LED string uses R_FB = 2.0 Ω (0.6 V ÷ 0.3 A). The ±2% tolerance applies to this programmed current under nominal conditions.

Does TLD5085EJFUMA1 require an external freewheeling diode?

Yes - an external Schottky diode (e.g., 40 V, 2 A, low forward voltage) must be connected between BUO and GND. The IC's integrated switch drives the diode's anode; the diode provides the freewheeling path during switch-off, as no synchronous rectifier is included.

Can TLD5085EJFUMA1 operate in constant-voltage mode?

Yes - configure FB as a resistive divider across the output capacitor to set a target voltage (0.6 V to 16 V). In this mode, the IC regulates output voltage instead of current, enabling use as a general-purpose buck converter for powering auxiliary ICs or RGB LED drivers.

TLD5085EJFUMA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: LITIX™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Regulator

Topology:: Step-Down (Buck)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 4.75V

Voltage - Supply (Max):: 45V

Voltage - Output:: 0.6V ~ 16V

Current - Output / Channel:: 1.8A

Frequency:: 370kHz

Dimming:: PWM

Applications:: Backlight

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

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-DSO-8

TLD5085EJFUMA1 FAQ

1.How can I place an order for TLD5085EJFUMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLD5085EJFUMA1 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 TLD5085EJFUMA1 reliable?

The price and inventory of TLD5085EJFUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5085EJFUMA1 is usually 5 days.

3.What payment methods are accepted for TLD5085EJFUMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5085EJFUMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLD5085EJFUMA1?

TLD5085EJFUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLD5085EJFUMA1 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 TLD5085EJFUMA1?

For technical support, including TLD5085EJFUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5085EJFUMA1 requirements.

6.How does Aetrix verify that TLD5085EJFUMA1 is sourced from the original manufacturer or authorized distributors?

All TLD5085EJFUMA1 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 TLD5085EJFUMA1 meets industry standards.

7.What is the process for return or replacement of TLD5085EJFUMA1?

All TLD5085EJFUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TLD5085EJFUMA1, 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 TLD5085EJFUMA1 part is unused and in its original packaging.

Return procedure for TLD5085EJFUMA1:

1.Submit a request within 90 days.

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

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