TLD1124ELXUMA1 - 360mA 1-Ch Linear LED Driver | Infineon LITIX
MPN: TLD1124ELXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.31 | $1.31 |
| 10 | $1.18 | $11.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.93 | $465.00 |
| 1,000 | $0.84 | $840.00 |
| 2,500 | $0.76 | $1,900.00 |
TLD1124ELXUMA1 Overview
A linear LED driver (also called an LED controller or linear current regulator) is a power-management IC that maintains a constant, programmed current through an LED or LED string rather than a constant voltage. Within the broader power hierarchy, linear LED drivers sit beneath switching DC-DC LED drivers and above simple ballast resistors; they trade conversion efficiency for ultra-low EMI, fast PWM dimming response, and minimal external component count — making them the preferred topology for noise-sensitive or cost-sensitive automotive lamp modules.
Key features of the TLD1124ELXUMA1 include an adjustable constant output current up to 360 mA set by a single external sense resistor, a wide supply range suited to automotive 12 V and 24 V bus systems, integrated PWM dimming via an enable/dimming input, and comprehensive protection including open-LED, short-to-GND, short-to-battery, over-temperature, and over-current diagnostics. The exposed thermal pad of the PG-SSOP-14-EP package provides a low θJA path to the PCB copper, which is essential when dissipating several watts in a linear topology.
The device is qualified to AEC-Q100 for automotive use and is targeted at rear lamps, daytime running lights, interior mood lighting, and instrument-panel backlighting. Typical design tips: choose a sense resistor of roughly 0.5 Ω to 1.5 Ω to program the 360 mA nominal current, keep the input bypass capacitor within 5 mm of the VS pin, and connect the exposed pad to a copper area of at least 1 cm². This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for TLD1124ELXUMA1 — 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 TLD1124ELXUMA1 (same form factor and footprint) — differing in Automotive Qualification, Package, Topology, Operating Temperature Range, Maximum Output Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLD1125ELXUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.85 / Unit
View Datasheet →TLD1211SJFUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.33 / Unit
View Datasheet →TLD1124ELXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Linear high-side constant-current LED driver |
| Number of Output Channels | 1 |
| Maximum Output Current per Channel | 360 mA |
| Supply Voltage Range (VS) | 5.5 V to 40 V |
| Dimming Method | PWM via EN/DIM input |
| Output Current Setting | External sense resistor (RSET) |
| Operating Temperature Range | -40 °C to +150 °C (Tj) |
| Package | PG-SSOP-14-EP (14-pin SSOP with exposed pad) |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 |
| Protection Features | Open-LED, short-to-GND, short-to-battery, over-temperature, over-current |
| Diagnostic Output | Yes (fault flag) |
| RoHS Status | Compliant |
| Series | LITIX™ Basic |
TLD1124ELXUMA1 Pin Configuration
| Pin 1 | VS — Supply voltage (5.5 V to 40 V) |
| Pin 2 | OUT — Current-regulated output to LED anode |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | IS — Current sense resistor to GND |
| Pin 6 | GND — Ground |
| Pin 7 | EN/DIM — Enable and PWM dimming input |
| Pin 8 | FAULT — Diagnostic fault output (open-drain) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | EP — Exposed thermal pad — solder to copper for heatsinking |
Typical Applications
TLD1124ELXUMA1 is suitable for 6 applications: Automotive Rear Combination Lamp (Tail / Brake / Turn), Daytime Running Light (DRL) LED String, Automotive Interior Ambient Lighting, Instrument-Cluster Backlighting, Indicator / Side-Marker LED Modules, Commercial-Vehicle 24 V LED Lighting.
Automotive Rear Combination Lamp (Tail / Brake / Turn)
The TLD1124ELXUMA1's 360 mA single-channel output and 5.5 V to 40 V VS rating make it a drop-in constant-current source for automotive rear lamps fed directly from the 12 V battery bus. The high-side linear topology adds zero switching EMI — important because adjacent CAN/LIN transceivers and FM tuners in the rear harness are EMI-sensitive. AEC-Q100 qualification and integrated open-LED/short-to-battery diagnostics allow the Body Control Module to flag a failed lamp to the driver. With a 1 Ω sense resistor the part delivers ~300 mA, matching typical 1 W and 3 W LED strings used in modern tail/brake/turn modules.
Recommended
Daytime Running Light (DRL) LED String
The TLD1124ELXUMA1 is well matched to DRL LED strings because its PWM dimming input allows the BCM to vary brightness between daytime running and parking-light modes without changing the sense resistor. The 40 V VS ceiling provides margin against 12 V load-dump transients up to ISO 7637-2 pulse profiles. Its linear regulation produces a clean DC current, which extends LED lifetime by eliminating the current ripple and thermal cycling that switching drivers can introduce at low duty cycles — a measurable reliability advantage in under-hood ambient temperatures up to 85 °C.
Recommended
Automotive Interior Ambient Lighting
Interior ambient and mood lighting typically uses 20 mA to 60 mA LED strings, well below the TLD1124ELXUMA1's 360 mA ceiling, so a single channel can drive several parallel strings. The PG-SSOP-14-EP exposed pad enables placement in compact overhead-console and door-trim PCBs where the available copper area is limited. Because the part has zero switching noise, it does not couple EMI into the cabin audio amplifier or the wireless-charger coil. The PWM dimming input is compatible with LIN-bridged BCM dim commands for smooth 1% to 100% brightness control.
Recommended
Instrument-Cluster Backlighting
Instrument-cluster backlights demand uniform brightness and zero audible noise — exactly what the TLD1124ELXUMA1's linear regulator delivers. A single channel can drive the cluster's main backlight string at 60 mA to 100 mA with no inductor whine, eliminating a long-standing complaint with switching LED drivers. The fault-diagnostic output can be routed back to the cluster microcontroller to illuminate a 'check lamp' warning when an LED fails open, satisfying OEM warranty and functional-safety requirements. The wide 5.5 V to 40 V input also supports 24 V commercial-vehicle clusters.
Recommended
Indicator / Side-Marker LED Modules
Side-marker and turn-indicator LEDs typically run at 30 mA to 150 mA per string, comfortably handled by the TLD1124ELXUMA1 at 360 mA. Mounting the IC directly on the lamp PCB reduces wiring harness complexity and improves EMC because there is no inductive switching node to radiate. The exposed pad of the PG-SSOP-14-EP package can be soldered to a small copper land, sufficient for the 1 W to 2 W dissipation typical of indicator strings. AEC-Q100 qualification ensures the lamp module can be qualified once and reused across global vehicle platforms.
Recommended
Commercial-Vehicle 24 V LED Lighting
The TLD1124ELXUMA1's 40 V VS ceiling is well above the 24 V truck and bus bus voltage plus transient overshoots, making it suitable for commercial-vehicle exterior lighting. Its linear topology means the part dissipates the excess (VS − VLED) as heat, which must be budgeted against the PCB copper area; at 24 V supply and a single 3 V white LED at 350 mA this is around 7 W. Designers therefore select the supply voltage and series-LED count to keep dissipation below 3 W per channel. AEC-Q100 qualification supports trucks, buses, and agricultural machinery.
Recommended
Recommended Products Summary
Engineering reference data for TLD1124ELXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLD1125ELXUMA1 | TLD1211SJFUMA1 |
|---|---|---|---|
| Package | PG-SSOP-14-EP | PG-SSOP-14-EP — same | PG-DSO-8 — verify before drop-in |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Number of Channels | 1 | 2 | 1 |
| Maximum Output Current | 360 mA | 180 mA per channel (360 mA total) | Lower current — verify per datasheet |
| Topology | Linear high-side | Linear high-side | Linear high-side |
| Dimming | PWM via EN/DIM | PWM via EN/DIM | PWM |
| AEC-Q100 | Yes | Yes | Yes |
Key Differentiators
- Single-channel 360 mA in PG-SSOP-14-EP (vs TLD1125ELXUMA1)
- Wide 5.5 V to 40 V supply range (vs TLD1211SJFUMA1)
- Integrated diagnostics (FAULT output) (vs Discrete transistor LED driver)
Design Notes
Estimated: at VS = 12 V, VLED = 3.2 V, ILED = 300 mA, the TLD1124ELXUMA1 dissipates approximately (12 V − 3.2 V) × 0.3 A = 2.6 W. The PG-SSOP-14-EP exposed pad must be soldered to a copper area of at least 1 cm² on the top layer (and ideally 2 cm² with thermal vias) to keep θJA below 50 K/W; without adequate copper the junction will exceed the 150 °C Tj maximum within seconds. Derate ILED above 70 °C ambient.
Place the 100 nF VS bypass capacitor within 5 mm of the VS pin and the sense resistor within 3 mm of the IS pin to minimize parasitic inductance that can inject voltage transients into the current regulation loop. Route the OUT trace away from the EN/DIM and FAULT traces to prevent coupling. Keep the LED string return close to GND to avoid ground bounce that disturbs the sense-resistor measurement.
Do not connect the exposed pad to a floating or signal-only copper island — it must be soldered to a continuous ground copper pour, otherwise θJA rises sharply and the IC will overheat at full 360 mA. The sense resistor must be a low-inductance type (thick-film or wire-wound SMD, NOT a long-path thin-film) to prevent PWM dimming transients from disturbing the regulation loop. The FAULT pin is open-drain and requires an external pull-up to the logic rail.
Compliance Information
AEC-Q100 qualified per Infineon LITIX™ Basic datasheet; RoHS compliant; lead-free reflow-compatible per PG-SSOP-14-EP package. Halogen-free status not stated in the verified data.
