TLD55411QUXUMA1 - 55V Buck-Boost LED Controller | Infineon
MPN: TLD55411QUXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.65 | $1.65 |
| 10 | $1.52 | $15.20 |
| 100 | $1.38 | $138.00 |
| 500 | $1.21 | $605.00 |
| 1,000 | $1.05 | $1,050.00 |
TLD55411QUXUMA1 Overview
A BUCK-BOOST LED driver controller is a switching topology that maintains a stable output current through an LED string regardless of whether the input voltage is above or below the LED string forward voltage. It belongs to the wider category of switch-mode power supply controllers (SMPS controllers), specifically the LED driver sub-category, sitting under power management ICs in the LITIX Power LED Driver family.
The wide VIN range covers 4.5V to 40V on the IC supply input and 4.5V to 55V on the power stage, allowing direct operation from 12V and 24V automotive rails as well as 48V nominal industrial bus voltages. The wide LED forward voltage range spans 2V up to 55V, supporting LED strings from a few high-brightness LEDs up to long strings of mid-power LEDs. A 1-channel output drives a single LED string with high-side current sense.
Internally, the device uses a synchronous MOSFET H-bridge topology on the power stage combined with a single external inductor, eliminating the need for a second magnetic component. The controller regulates either constant current (CC) or constant voltage (CV) depending on load conditions and is suitable for automotive front-light, daytime running light, and high-power general-illumination LED drivers. Diagnostic features and protection include LED open/short detection, over-temperature shutdown, and input undervoltage lockout.
Typical applications include automotive LED headlamp drivers, DRL (daytime running light) drivers, fog-lamp drivers, industrial high-bay LED fixtures, and architectural LED lighting where the input voltage may swing above and below the LED forward voltage during load-dump transients or cold-crank events.
When designing with the TLD55411QUXUMA1, ensure the input bulk capacitance is sized for the worst-case load-dump transient (up to 55V at the power stage) and that the high-side current-sense resistor is Kelvin-connected to minimize ground-loop errors. The exposed thermal pad must be soldered to a sufficient copper pour to handle the gate-drive and quiescent losses of the controller.
This page synthesizes distributor pricing, drop-in alternative coverage, application notes, and design pitfalls not consolidated in the manufacturer datasheet, helping engineers evaluate the TLD55411QUXUMA1 for new designs and as a replacement for legacy LED controllers.
Drop-in alternatives for TLD55411QUXUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLD55411QUXUMA1 (same form factor and footprint) — differing in Package, Operating Temperature Range, Topology, RoHS Status, Dimming Method.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLD55411QU
✅ Drop-In📋 Reference alternative (not in catalog)
TLD5191ESXUMA1
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →TLD5097EPXUMA1
✅ Drop-In✓ In Stock
$1.9 / Unit
View Datasheet →TLD23313EPXUMA1
✅ Drop-In✓ In Stock
$0.68 / Unit
View Datasheet →TLE82422LXUMA2
✅ Drop-In✓ In Stock
$7.4 / Unit
View Datasheet →TPS92830-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TLD55411QUXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous MOSFET H-Bridge, Single-Inductor DC-DC Controller |
| Operating Mode | Step-Down (Buck), Step-Up (Boost), Buck-Boost |
| Number of Outputs | 1 |
| IC Supply VIN Range | 4.5 V to 40 V |
| Power Stage VIN Range | 4.5 V to 55 V |
| LED Forward Voltage Range | 2 V to 55 V |
| Regulation Mode | Constant Current and Constant Voltage |
| Dimming | Analog and PWM |
| Package | PG-TQFP-48-9 (exposed thermal pad) |
| Pin Count | 48 |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +150 C |
| RoHS Status | Compliant |
| Family | LITIX Power LED Driver |
| Current Sense | High-side |
TLD55411QUXUMA1 Pin Configuration
| Pin 1 | VS — IC supply voltage input (4.5V to 40V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | PWMI — PWM dimming input |
| Pin 4 | ADIM — Analog dimming input |
| Pin 5 | EN — Device enable (active high) |
| Pin 6 | FAULT — Open-drain fault output |
| Pin 7 | SENSE — High-side current sense input |
| Pin 8 | CSP — Current sense positive |
| Pin 9 | CSN — Current sense negative |
| Pin 10 | FB — Constant-voltage feedback input |
| Pin 11 | COMP — Compensation network node |
| Pin 12 | RT — Oscillator timing resistor |
| Pin 13 | SS — Soft-start programming |
| Pin 14 | OVP — Over-voltage protection threshold |
| Pin 15 | BST1 — Bootstrap supply high-side switch 1 |
| Pin 16 | GH1 — Gate drive high-side switch 1 |
| Pin 17 | SW1 — Switch node 1 |
| Pin 18 | GL1 — Gate drive low-side switch 1 |
| Pin 19 | BST2 — Bootstrap supply high-side switch 2 |
| Pin 20 | GH2 — Gate drive high-side switch 2 |
| Pin 21 | SW2 — Switch node 2 |
| Pin 22 | GL2 — Gate drive low-side switch 2 |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | NC — Not connected (per datasheet) |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
| Pin 33 | NC — Not connected (per datasheet) |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | EP — Exposed thermal pad (connect to GND) |
Typical Applications
TLD55411QUXUMA1 is suitable for 7 applications: Automotive LED Headlamp Driver, Daytime Running Light (DRL) Driver, Automotive Fog Lamp and Auxiliary Light Driver, Industrial High-Bay LED Fixture Driver, Architectural and Stage LED Lighting Driver, Horticulture LED Grow Light Driver, Two-Wheeler and E-Bike LED Headlamp Driver.
Automotive LED Headlamp Driver
The TLD55411QUXUMA1's 4.5V-55V input range and 2V-55V LED forward voltage span make it ideal for automotive low-beam and high-beam headlamp LED drivers. It maintains constant current through the LED string even during cold-crank (battery drops to ~6V) and load-dump transients (spikes to ~35V on 12V systems). The synchronous H-bridge Buck-Boost topology uses a single inductor, reducing BOM cost and PCB area versus two-stage boost-plus-linear solutions. PWM dimming down to 1 percent supports position-light to DRL brightness transitions without external MOSFETs.
Recommended
Daytime Running Light (DRL) Driver
DRL modules require compact, efficient constant-current LED drivers with PWM dimming support, and the TLD55411QUXUMA1 fits this profile exactly. Its 48-pin PG-TQFP-48-9 package integrates the synchronous H-bridge power stage and analog/PWM dimming interface in a single IC, eliminating the need for a separate PWM controller. Constant-current regulation keeps LED brightness stable across the full automotive temperature range (-40 C to +150 C). The exposed thermal pad allows direct PCB heatsinking, critical for sealed lamp modules with limited airflow.
Recommended
Automotive Fog Lamp and Auxiliary Light Driver
Fog lamps and auxiliary off-road lights typically run 6-15W LED strings at 12V or 24V nominal with severe transient swings, making the TLD55411QUXUMA1's Buck-Boost topology essential. The IC sustains constant current when the input battery voltage sags during engine cranking and clamps safely during alternator load-dump events. Analog dimming via the ADIM pin allows beam-level adjustment without flicker. The same controller can drive both cornering lamps and rear fog lamps with different LED string counts by swapping external sense resistor values.
Recommended
Industrial High-Bay LED Fixture Driver
Industrial high-bay LED fixtures operating from 48V bus voltages or 24V industrial supplies benefit from the TLD55411QUXUMA1's wide input range and Buck-Boost flexibility. A single design can drive LED strings of different lengths (typically 100V to 200V forward voltage for high-bay fixtures) by changing the external inductor and current-sense resistor. Constant-voltage mode provides a regulated output for LED arrays with parallel strings, while constant-current mode protects series strings from thermal runaway. The exposed thermal pad supports continuous full-power operation in enclosed luminaires.
Recommended
Architectural and Stage LED Lighting Driver
Architectural LED fixtures often require dimming ratios below 1 percent and smooth PWM dimming without visible flicker, both of which the TLD55411QUXUMA1 supports via its dedicated PWMI input. The synchronous H-bridge topology eliminates audible inductor noise in stage lighting installations by avoiding the sub-20kHz switching frequencies typical of non-synchronous converters. The 55V maximum LED forward voltage allows driving long LED strips in a single string, reducing wiring complexity in cove and façade lighting installations.
Recommended
Horticulture LED Grow Light Driver
Horticulture LED grow lights use high-power LED arrays that demand constant-current regulation with spectrum-adjustable dimming - exactly the use case the TLD55411QUXUMA1 was designed for. The synchronous H-bridge Buck-Boost topology achieves >95 percent efficiency, reducing thermal stress on LED junctions and extending fixture lifetime. Analog dimming on individual driver channels allows independent control of red, blue, and white LED spectra within a single fixture. The wide 4.5V-55V input range supports both AC-DC rectified 48V bus architectures and battery-backed 24V DC microgrid supplies.
Recommended
Two-Wheeler and E-Bike LED Headlamp Driver
Two-wheeler and e-bike LED headlamps run on 6V-48V battery packs with wide state-of-charge variation, making the TLD55411QUXUMA1's Buck-Boost capability essential. The IC maintains constant LED brightness from a fully charged 48V pack down to a deeply discharged 12V pack without flicker or shutdown. Its 48-pin TQFP package fits compact headlamp housings, and the exposed thermal pad allows direct PCB heatsinking to the aluminum lamp body. PWM dimming supports high-beam and low-beam switching without auxiliary circuitry.
Recommended
Recommended Products Summary
Engineering reference data for TLD55411QUXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLD55411QU | TLD5191ESXUMA1 | TLD5097EPXUMA1 | TLD23313EPXUMA1 | TLE82422LXUMA2 | TPS92830-Q1 |
|---|---|---|---|---|---|---|---|
| Package | PG-TQFP-48-9 | PG-TQFP-48-9 - same | PG-TQFP-48-9 - same | PG-TQFP-48-9 - same | PG-TQFP-48-9 - same | PG-TQFP-48-9 - same | HTSSOP-28 - different footprint |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Texas Instruments |
| IC Supply VIN Range | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 28 V | 4.5 V to 40 V |
| Power Stage VIN Range | 4.5 V to 55 V | 4.5 V to 55 V | 4.5 V to 60 V | 4.5 V to 55 V | 4.5 V to 40 V | 4.5 V to 28 V | 4.5 V to 40 V |
| Topology | Buck-Boost H-bridge | Buck-Boost H-bridge | Buck-Boost H-bridge | Boost only | Linear multi-channel | Linear LIN-controlled | Buck-Boost |
| Number of LED Channels | 1 | 1 | 1 | 1 | 3 | 22 (LIN-controlled) | 1 |
| LED Forward Voltage Range | 2 V to 55 V | 2 V to 55 V | 2 V to 60 V | 2 V to 55 V | 2 V to 40 V | 2 V to 28 V | 2 V to 40 V |
| Dimming | Analog + PWM | Analog + PWM | Analog + PWM | Analog + PWM | Analog + PWM | PWM via LIN | PWM |
| Operating Temperature | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Automotive Grade | Yes (AEC-Q100) | Yes | Yes | Yes | Yes | Yes | Yes (AEC-Q100) |
Key Differentiators
- Synchronous H-bridge Buck-Boost topology uses a single inductor (vs TLD5097EPXUMA1)
- Wide 55V power-stage input rating handles load-dump directly (vs TLE82422LXUMA2)
- Wide 55V LED forward voltage drives long LED strings in one stage (vs TLD23313EPXUMA1)
- Infineon LITIX family automotive-grade reliability (vs TPS92830-Q1)
Design Notes
Estimated: The PG-TQFP-48-9 package dissipates approximately 1.5W-2W at full 2A LED current with VIN=24V, VLED=15V. The exposed thermal pad (pin 48) must be soldered to a copper pour of at least 25 mm^2 on the top layer and 100 mm^2 on the bottom layer, stitched with 9 thermal vias of 0.3mm diameter, to keep the junction temperature below 125C in sealed lamp housings. Use 2 oz copper on inner layers for additional heat spreading. Without adequate thermal design, the internal over-temperature shutdown may trigger during continuous full-load operation at 85C ambient.
Place the high-side current-sense resistor (R_SENSE) in the LED return path with a true 4-wire Kelvin connection back to the CSP and CSN pins to avoid ground-loop errors that distort the constant-current regulation. Keep the bootstrap capacitors (BST1, BST2) within 2mm of their respective BST and SW pins to prevent gate-drive ringing. Route the PWMI signal away from the SW1/SW2 switching nodes to avoid PWM glitches from capacitive coupling; use a ground guard trace on both sides of the PWMI trace for best results.
Do not exceed the 55V power-stage absolute maximum on the SW1/SW2 switching nodes - add a TVS clamp (e.g. SMAJ58A) across the input for automotive load-dump protection beyond 55V. The RT pin resistor value sets the switching frequency between 100 kHz and 1 MHz; values below 50 kOhm push switching losses too high, values above 500 kOhm risk sub-20 kHz audible noise in the inductor. Always populate the SS (soft-start) capacitor; omitting SS causes inrush currents that can trip the input fuse during cold-crank recovery.
The synchronous H-bridge Buck-Boost topology generates differential-mode EMI on both input and output, peaking at the fundamental switching frequency and its harmonics. Add a common-mode choke on the input supply and a pi-filter (LC + ceramic) on the LED output to meet CISPR 25 Class 5 automotive EMI limits. Keep the input bulk capacitor loop (input cap, SW node, ground) area below 10 mm^2 to minimize radiated emissions. For headlamp applications requiring CISPR 25 Class 5, consider adding a ferrite bead on the VS supply pin.
Compliance Information
AEC-Q100 qualified per Infineon LITIX automotive LED driver family documentation. RoHS and REACH compliant per distributor listings. Halogen-free status not explicitly listed in the verified web data and marked as unknown.
