TLD11731ETXUMA1 - 400mA Linear LED Driver | Infineon LITIX
MPN: TLD11731ETXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.38 | $138.00 |
| 500 | $1.15 | $575.00 |
| 1,000 | $0.95 | $950.00 |
| 3,000 | $0.78 | $2,340.00 |
TLD11731ETXUMA1 Overview
A linear LED driver (constant-current sink) is a type of LED driver IC that regulates current through an LED string by dissipating excess voltage as heat, rather than switching it. Linear drivers sit within the broader LED driver IC category, alongside switching buck/boost LED drivers; they are preferred for applications where low EMI, no audible noise, and minimal external component count are priorities, at the cost of lower efficiency when VIN approaches VLED. They belong to the power management semiconductor family.
Key features of the TLD11731ETXUMA1 include a wide input voltage range of 4.5 V to 40 V, an output voltage tolerance rated up to 36 V, 400 mA maximum output current per channel, integrated PWM dimming input, and the LITIX power shift feature that redistributes power dissipation for better thermal spreading. The exposed thermal pad enables direct PCB heatsinking without external heatsinks in typical automotive rear-light and interior-lighting layouts.
The device uses a bipolar-based linear regulator architecture with internal control logic, current sense, and thermal protection circuitry. An internal reference and sense resistor set the output current; the device regulates the drop across its OUT pin to keep current constant regardless of LED forward-voltage variations. Thermal shutdown and load-disconnect protection improve system robustness against short-to-ground and open-load faults on the LED string.
Typical applications include automotive rear combination lamps (tail, brake, turn), interior ambient lighting, dashboard backlighting, side-marker lights, daytime running light segments, and general-purpose industrial LED strips. The AEC-Q100 qualification plus wide 4.5 V–40 V input range also suits 12 V/24 V commercial-vehicle lighting. In power-rail systems, the TLD11731ETXUMA1 typically replaces discrete resistor-current-limit networks with a single IC, reducing PCB area and improving LED brightness uniformity.
When designing with the TLD11731ETXUMA1, calculate worst-case power dissipation as PD = (VIN - VLED) x ILED and ensure the PCB copper area tied to the exposed pad keeps junction temperature below the thermal-shutdown threshold. The PWM dimming input accepts logic-level signals; for analog dimming, the device must be operated within its PWM duty-cycle range.
This page synthesizes distributor pricing, drop-in alternatives from the Infineon LITIX family, and practical thermal/layout design notes not found in the manufacturer datasheet.
Drop-in alternatives for TLD11731ETXUMA1 — 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 TLD11731ETXUMA1 (same form factor and footprint) — differing in Package, Topology, Automotive Qualification, Dimming Method, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLD23313EPXUMA1
✅ Drop-In✓ In Stock
$0.68 / Unit
View Datasheet →TLD1125ELXUMA1
✅ Drop-In✓ In Stock
$0.85 / Unit
View Datasheet →TLD5097EPXUMA1
✅ Drop-In✓ In Stock
$1.9 / Unit
View Datasheet →TLD1211SJFUMA1
✅ Drop-In✓ In Stock
$0.33 / Unit
View Datasheet →TLD11731ETXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Linear low-side current sink |
| Number of Outputs | 1 |
| Input Voltage Range | 4.5 V to 40 V |
| Maximum Output Voltage | 36 V |
| Output Current | 400 mA |
| Dimming Method | PWM |
| Special Feature | Power Shift (LITIX) |
| Package | PG-TFDSO-16-1 (TSSOP-16 with exposed pad) |
| Automotive Qualification | AEC-Q100 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Fault Protection | Thermal shutdown, open-load, short-to-ground detection |
| Channel Type | Single low-side |
| Lead-Free | Yes |
TLD11731ETXUMA1 Pin Configuration
| Pin 1 | IN — Supply voltage input (4.5 V to 40 V) |
| Pin 2 | PWM — PWM dimming input (logic level) |
| Pin 3 | EN — Enable input |
| Pin 4 | GND — Ground |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | OUT — Current sink output to LED cathode |
| Pin 8 | NC — Not connected (per datasheet) |
| 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 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin EP | EP — Exposed thermal pad - must be soldered to PCB copper pour for thermal dissipation |
Typical Applications
TLD11731ETXUMA1 is suitable for 6 applications: Automotive Rear Combination Lamps, Automotive Interior Ambient Lighting, Dashboard Backlighting, Side-Marker and Position Lights, Daytime Running Light (DRL) Segments, Industrial 24V LED Strip Lighting.
Automotive Rear Combination Lamps
The TLD11731ETXUMA1 directly drives tail/brake/turn LED strings in automotive rear lamps. Its 4.5–40 V input range absorbs 12 V load-dump events up to 40 V without external TVS, the AEC-Q100 qualification supports automotive reliability, and 400 mA single-channel output covers high-brightness stop-lamp segments. The PG-TFDSO-16-1 exposed pad allows PCB copper heatsinking to keep junction temperature below thermal-shutdown threshold at VIN=13.5 V and full 400 mA load.
Recommended
Automotive Interior Ambient Lighting
For interior LED strips and ambient lighting modules, the TLD11731ETXUMA1 delivers 400 mA of constant current with PWM dimming for smooth brightness control. Its linear topology ensures zero EMI, critical for cabin electronics sensitive to switching noise (audio, RF receivers). The PG-TFDSO-16-1 package fits compact PCB assemblies behind dashboard trim, and the 4.5–40 V input tolerates cranking and load-dump transients on the 12 V vehicle bus.
Recommended
Dashboard Backlighting
Dashboard backlight LED arrays benefit from the TLD11731ETXUMA1's PWM dimming input, which enables synchronized brightness control with the vehicle's day/night photo sensor. The linear topology eliminates audible noise from PWM switching that could otherwise couple into the cabin microphone. Up to 400 mA drives multi-LED clusters, and AEC-Q100 qualification meets instrument-cluster reliability requirements across -40 to +125 °C ambient.
Recommended
Side-Marker and Position Lights
Side-marker LEDs require low-current, high-reliability drivers operating from the vehicle 12 V/24 V bus. The TLD11731ETXUMA1's 4.5–40 V input covers both 12 V passenger cars and 24 V commercial vehicles without voltage translation. Its open-load and short-to-ground fault detection meets automotive lamp-out diagnostic requirements, while the exposed thermal pad keeps junction temperature low even when mounted in enclosed lamp housings.
Recommended
Daytime Running Light (DRL) Segments
DRL segments demand high-brightness LED drivers with robust fault handling. The TLD11731ETXUMA1's 400 mA output drives high-flux LED strings, while its integrated fault protection (open-load, short-to-ground, thermal shutdown) meets automotive functional-safety requirements. The LITIX power-shift feature redistributes power dissipation across the die, enabling DRL operation at high ambient temperatures without thermal derating.
Recommended
Industrial 24V LED Strip Lighting
Industrial 24 V LED strips benefit from the TLD11731ETXUMA1's wide 4.5–40 V input range, which tolerates industrial supply transients. Its linear topology produces zero EMI, suitable for factory-automation environments with sensitive analog sensors. The 400 mA channel capacity drives long LED chains at moderate brightness, while the exposed thermal pad and PG-TFDSO-16-1 package enable compact DIN-rail or junction-box integration.
Recommended
Recommended Products Summary
Engineering reference data for TLD11731ETXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLD23313EPXUMA1 | TLD1125ELXUMA1 | TLD5097EPXUMA1 | TLD1211SJFUMA1 |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TFDSO-16-1 (TSSOP-16 EP) | PG-TFDSO-16-1 - same | PG-TFDSO-16-1 - same | PG-TFDSO-16-1 - same | PG-TFDSO-16-1 - same |
| Topology | Linear low-side | Linear low-side | Linear low-side | DC-DC buck (switching) | Linear low-side |
| Number of Channels | 1 | 3 | 1 | 1 | 1 |
| Dimming | PWM | PWM | PWM | PWM/analog | PWM |
| AEC-Q100 | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated power-shift thermal distribution (vs TLD23313EPXUMA1)
- Single-channel 400 mA in compact PG-TFDSO-16-1 (vs TLD1125ELXUMA1)
- Linear topology with zero EMI (vs TLD5097EPXUMA1)
Design Notes
Estimated: At VIN=13.5 V, VLED=9 V (3 LED drop), and 400 mA load, power dissipation is (13.5-9) × 0.4 = 1.8 W. With PG-TFDSO-16-1 exposed pad soldered to at least 1 square inch of copper pour on a 1 oz 4-layer FR4 board, junction-to-ambient thermal resistance is approximately 35–40 C/W, yielding a junction temperature rise of 63–72 °C above 25 °C ambient. Without adequate copper area, the device may trigger thermal shutdown at high VIN. Always compute worst-case PD across the full VIN operating range (including 40 V load-dump) and provide sufficient PCB copper on the exposed pad.
Place a 100 nF decoupling capacitor as close as possible to the IN pin, and a 10 µF bulk capacitor on the supply rail within 5 mm of the device. The exposed thermal pad must be soldered to a continuous ground copper pour with thermal vias (recommended 9–16 vias in a 3×3 grid, 0.3 mm drill, 1 mm pitch) connecting to inner-layer ground planes. Avoid routing sensitive analog signal traces directly under the device to minimize coupling to the exposed pad's ground reference.
Do not leave the exposed pad unsoldered - this forces all heat dissipation through the small TSSOP leads and the device will enter thermal shutdown at modest loads. When using PWM dimming, ensure the PWM signal source can drive the input capacitance at the desired frequency; for dimming ratios below 5% the LED may exhibit visible flicker due to minimum-on-time limits. For 24 V commercial-vehicle applications, verify that the 40 V absolute-max rating covers load-dump transients (which can reach 36 V steady-state on a 24 V system).
Route the OUT pin trace directly to the LED cathode with the shortest possible path to minimize parasitic inductance. Place the LED string physically close to the driver to reduce EMI from large switching loops during PWM transitions. For multi-PCB lamp assemblies, consider star-ground topology from the TLD11731ETXUMA1 GND pin back to the lamp's main ground terminal to prevent ground-bounce noise from coupling into other lamp electronics.
Compliance Information
AEC-Q100 qualified per Infineon product page. RoHS and REACH compliant. Halogen-free status not explicitly stated in verified data.
