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

Infineon Technologies TLD55411QVXUMA1

Name: TLD55411QVXUMA1
Brand: Infineon Technologies
SKU: TLD55411QVXUMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLD55411QVXUMA1

Manufacturer:: Infineon Technologies

Category:: LED Drivers

Package:: 48-VFQFN Exposed Pad

Datasheet:: TLD55411QVXUMA1.pdf

Description:: IC LED DRIVER CTRLR PWM 48VQFN

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Product details

Overview

TLD55411QVXUMA1 from Infineon is a synchronous H-bridge DC/DC controller for high-power LED driving in automotive lighting, supporting buck-boost topology with 4.5–55 V power input, 200–700 kHz adjustable switching frequency, SPI diagnostics, and ±3% LED current accuracy. It integrates dual high-side/low-side gate drivers (R_DS(ON) = 2.3 Ω / 1.2 Ω), fast output discharge, and limp-home fail-safe mode.

For engineers reviewing the TLD55411QVXUMA1 datasheet, TLD55411QVXUMA1 pinout, TLD55411QVXUMA1 application, or TLD55411QVXUMA1 equivalent, key selection criteria include its dual-switch-node H-bridge architecture, integrated current/voltage loop feedback (FBH/FBL/VFB), programmable spread spectrum for EMC compliance, and AEC-Q100 qualification for harsh automotive environments.

Technical Context

The TLD55411QVXUMA1 implements a current-mode regulated H-bridge topology with independent high-side (HSGD1/HSGD2) and low-side (LSGD1/LSGD2) MOSFET drivers, enabling bidirectional energy transfer for buck, boost, and buck-boost LED current regulation. Its dual feedback paths-SWCS-based inductor current sensing and FBH/FBL-based LED current monitoring-enable precise constant-current control across wide forward voltage ranges (2–55 V).

SPI interface provides real-time access to latched diagnostics including open-load detection, thermal prewarning, and I_IN/I_OUT monitor outputs (IINMON, IOUTMON). The device supports analog dimming via SET pin and PWM dimming via PWMI, with soft-start ramp controlled by external capacitor on SOFT_START.

Key Specifications

Parameter	Value and Actual Design Meaning
V_POW Range	4.5 V to 55 V - Supports full automotive battery range including load dump transients up to 55 V without external clamping.
V_VIN Range	4.5 V to 40 V - Digital supply domain compatible with 5 V or 3.3 V systems; enables operation during cold-crank conditions down to 4.5 V.
f_SW	200 kHz to 700 kHz - Adjustable via FREQ pin resistor; higher frequencies reduce passive size, lower frequencies improve efficiency at high current.
LED Current Accuracy	±3% - Achieved via precision internal current sense amplifier and calibrated feedback path (FBH/FBL), critical for consistent luminance in matrix headlamps.
I_OUT Monitor Gain	8×(V_FBH−V_FBL) + 200 mV - Provides scalable analog output for closed-loop system monitoring with 1.4 V output at 150 mV differential sense voltage.
R_DS(ON) (HS)	2.3 Ω (typ.) - Gate driver pull-up strength ensures fast turn-on of high-side N-MOSFETs in buck-boost configurations with bootstrap biasing.
R_DS(ON) (LS)	1.2 Ω (typ.) - Low-side driver resistance minimizes conduction loss during synchronous rectification in boost and buck modes.

Pinout & Package

Package: PG-VQFN-48-31 (exposed thermal pad), thermally enhanced for automotive under-hood operation. Pin count: 48. Pin pitch: 0.5 mm. RoHS-compliant, AEC-Q100 qualified.

Pin/Terminal	Circuit Role	Design Meaning
HSGD1, HSGD2	High-side gate driver outputs	Drive top N-MOSFET gates with bootstrapped voltage referenced to SWN1/SWN2; require external BST1/BST2 capacitors.
LSGD1, LSGD2	Low-side gate driver outputs	Drive bottom N-MOSFET gates referenced to PGND1/PGND2; enable synchronous rectification and bidirectional current flow.
SWN1, SWN2	Switch nodes	Connect to external MOSFET drains; SWN1 swings below GND in buck mode, SWN2 swings above V_OUT in boost mode.
FBH, FBL	LED current sense inputs	Differential pair measuring shunt voltage across external sense resistor; sets constant-current regulation point with ±3% accuracy.
VFB	Voltage loop feedback	Monitors output voltage for overvoltage protection and buck-mode regulation; used with external resistive divider for V_OUT setpoint.
LHI	Limp-home activation input	Pull-low to force fail-safe mode: reduces LED current to predefined safe level while maintaining partial illumination during fault conditions.
SOFT_START	Soft-start timing control	External capacitor sets ramp time to limit inrush current and prevent voltage overshoot during startup.
IINMON, IOUTMON	Analog monitor outputs	IINMON = 20×(V_IIN1−V_IIN2); IOUTMON = 8×(V_FBH−V_FBL) + 200 mV - Enable real-time system-level current supervision without ADC.

Key Features

Feature	Design Value
Auto Spread Spectrum Modulation	Reduces peak EMI by dithering switching frequency ±10%, meeting CISPR 25 Class 5 requirements without added shielding.
Fast Output Discharge	Enables rapid LED turn-off (<100 µs) via active discharge path, critical for adaptive driving beam (ADB) pixel light response time.
Dual Dimming Interface	Supports simultaneous analog (SET pin DAC) and PWM (PWMI pin) dimming with seamless blending-enables smooth transition between ambient and high-beam states.
Thermal Prewarning & Shutdown	Reports junction temperature via SPI before shutdown; autorestart after cooldown prevents permanent lamp outage during transient overheating.
Open-Load Detection in ON-State	Identifies broken LED strings during active regulation using SWCS current sense and FBH/FBL comparison-avoids false fault triggers during PWM dimming off-cycles.

Applications

Automotive Matrix Headlamp

Adaptive Driving Beam (ADB)

Use Scenario: Dynamic pixel-level LED control in front-facing headlamps with real-time beam shaping based on camera input.

IC Role / Device Role / Timing Role: H-bridge DC/DC controller regulating individual LED segments with independent current control per zone via FBH/FBL feedback loops.

Use Value: Enables <100 µs current settling time and ±3% current matching across 100+ LEDs, ensuring uniform photometric output in dynamic beam patterns.

Use Scenario: Selective high-beam masking to avoid glare for oncoming traffic while maintaining maximum illumination elsewhere.

IC Role / Device Role / Timing Role: Fast-switching buck-boost regulator driving segmented LED arrays with synchronized PWM dimming and limp-home fallback on fault.

Use Value: Achieves <500 ns PWM edge jitter and sub-10 µs fault-to-limp transition, meeting ISO 15008 visibility safety thresholds.

Automotive Full-LED Tail Lamp

Commercial Vehicle Stop/Turn Signal

Use Scenario: High-brightness rear lighting with sequential turn indication and brake light intensity modulation.

IC Role / Device Role / Timing Role: Constant-current LED driver with analog dimming (SET) and PWM dimming (PWMI) supporting multi-function signaling on shared LED strings.

Use Value: Maintains ±3% current accuracy across −40°C to +125°C ambient, ensuring regulatory-compliant luminance consistency during thermal cycling.

Use Scenario: Heavy-duty truck tail lamps requiring robust operation under 24 V battery systems with wide voltage transients.

IC Role / Device Role / Timing Role: Wide-input (4.5–55 V) buck-boost controller with input overvoltage lockout (INOVLO) and load-dump immunity up to 55 V.

Use Value: Eliminates need for external TVS clamping by sustaining 55 V for 400 ms per ISO 7637-2 Pulse 5a, reducing BOM cost and PCB area.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power automotive LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX20051ATP/V+T	Single-channel buck controller only; no H-bridge or buck-boost capability; lacks SPI diagnostics and limp-home function.	Restricted to fixed-direction LED current flow; unsuitable for matrix/pixel architectures requiring bidirectional energy transfer.	Select when cost-sensitive single-beam designs require minimal feature set and no fail-safe requirement.
TPS92692QPWPRQ1	Integrated high-side switch only; no low-side drivers or H-bridge topology; supports only boost/buck, not buck-boost; no spread spectrum.	Limited to unidirectional topologies; cannot drive floating LED loads or support fast output discharge for ADB.	Prefer for simpler boost-only headlamp modules where thermal constraints allow discrete low-side MOSFETs.

Compared with MAX20051ATP/V+T and TPS92692QPWPRQ1, the TLD55411QVXUMA1 uniquely delivers integrated H-bridge gate drivers, bidirectional buck-boost regulation, SPI-configurable diagnostics, and automotive-grade limp-home-making it the only solution qualified for adaptive pixel-light systems requiring functional safety and EMC robustness.

Availability

TLD55411QVXUMA1 is available at Aetrix Electronics and suitable for automotive exterior lighting, adaptive driving beam (ADB) systems, and commercial vehicle LED lamp modules requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for TLD55411QVXUMA1 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 ICs, and security solutions, with global R&D and manufacturing infrastructure.

The TLD55411QVXUMA1 belongs to Infineon's LITIX™ Power Flex product line, designed specifically for scalable, high-efficiency LED driver solutions in automotive lighting-emphasizing functional safety, EMC resilience, and architectural flexibility for matrix and pixel light systems.

FAQ

What is the purpose of the LHI pin and how is it used in fail-safe operation?

The LHI (Limp Home Input) pin is a dedicated digital input that, when pulled low, forces the TLD55411QVXUMA1 into fail-safe mode. In this state, LED current is reduced to a preconfigured safe level while maintaining partial illumination-critical for automotive compliance during faults like open-load or overtemperature. It operates independently of SPI commands and responds within <10 µs, ensuring immediate safety action without software intervention.

Can the TLD55411QVXUMA1 operate in standalone mode without SPI communication?

Yes. The TLD55411QVXUMA1 functions fully without SPI: all regulation loops (current/voltage), protection features (overvoltage, thermal, open-load), dimming (analog via SET, PWM via PWMI), and limp-home activation remain active. SPI is optional and used only for advanced diagnostics, configuration, and real-time monitoring-not required for basic LED driving functionality.

How does the device handle input voltage transients such as load dump?

The TLD55411QVXUMA1 sustains up to 55 V on VIN for 400 ms per ISO 7637-2 Pulse 5a, thanks to its 55 V absolute maximum rating and internal overvoltage protection triggered via INOVLO pin. When VIN exceeds the threshold set by external resistor divider on INOVLO, the device shuts down gate drivers and enters UVLO-like state-preventing damage without requiring external TVS diodes in most automotive designs.

What is the role of the SWCS and SGND pins, and why must they be routed differentially?

SWCS (Switch Current Sense) and SGND form a differential pair measuring inductor current for peak-current-mode control. Routing them as a tightly coupled differential net minimizes noise pickup and ensures accurate current sensing during high dV/dt switching events. Mismatched trace lengths or asymmetry introduces offset errors that degrade current regulation accuracy and can cause instability in the compensation loop tied to COMP pin.

TLD55411QVXUMA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: LITIX™

Package/Case:: 48-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Type:: DC DC Controller

Topology:: Step-Down (Buck), Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 40V

Voltage - Output:: 55V

Current - Output / Channel:: -

Frequency:: 200kHz ~ 700kHz

Dimming:: Analog, PWM

Applications:: -

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

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-VQFN-48-31

TLD55411QVXUMA1 FAQ

1.How can I place an order for TLD55411QVXUMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLD55411QVXUMA1 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 TLD55411QVXUMA1 reliable?

The price and inventory of TLD55411QVXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD55411QVXUMA1 is usually 5 days.

3.What payment methods are accepted for TLD55411QVXUMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD55411QVXUMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLD55411QVXUMA1?

TLD55411QVXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLD55411QVXUMA1 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 TLD55411QVXUMA1?

For technical support, including TLD55411QVXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD55411QVXUMA1 requirements.

6.How does Aetrix verify that TLD55411QVXUMA1 is sourced from the original manufacturer or authorized distributors?

All TLD55411QVXUMA1 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 TLD55411QVXUMA1 meets industry standards.

7.What is the process for return or replacement of TLD55411QVXUMA1?

All TLD55411QVXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TLD55411QVXUMA1, 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 TLD55411QVXUMA1 part is unused and in its original packaging.

Return procedure for TLD55411QVXUMA1:

1.Submit a request within 90 days.

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

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