TLD2311ELXUMA1 - 3-Ch 120mA LED Driver | Infineon LITIX Basic
MPN: TLD2311ELXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.65 | $1.65 |
| 10 | $1.45 | $14.50 |
| 100 | $1.18 | $118.00 |
| 500 | $0.96 | $480.00 |
| 1,000 | $0.83 | $830.00 |
TLD2311ELXUMA1 Overview
A linear constant-current LED driver is a semiconductor device that regulates the forward current through one or more LED strings by dissipating excess voltage as heat on a high-side or low-side pass element. It belongs to the category hierarchy: LED driver -> power management IC -> semiconductor. Compared with switched-mode LED drivers, linear topologies eliminate EMI, simplify the BOM (no inductors, no output capacitors), and provide inherently flicker-free current - critical for safety lighting such as brake lights, tail lights, and daytime running lights (DRLs).
Key features include three independent 120 mA current outputs, integrated power transistors with thermal protection, PWM dimming support, and an analog/digital dimming input for brightness control. The PG-SSOP-14-5 package with exposed pad provides a low thermal resistance path, allowing continuous operation at the rated current without an external heatsink in typical automotive lamp modules. Built-in diagnostic functions detect open-LED, short-LED, and overtemperature conditions and report them back to the microcontroller for fail-safe system behavior.
The TLD2311EL architecture uses three parallel high-side current regulators, each trimmed to a precise reference. The LITIXβ’ Basic technology targets cost-sensitive automotive lighting applications that previously required discrete transistor solutions. Footprint compatibility across the LITIXβ’ Basic family allows designers to migrate from 2-channel to 3-channel parts, or to higher-current variants, without changing the PCB.
Typical applications include automotive rear combination lamps (brake, tail, turn signal), daytime running lights, interior ambient lighting, and status indicator LED strings. The device is qualified for the harsh automotive environment, including extended temperature range and load-dump transient tolerance, making it well suited for body-electronics ECUs and lighting control modules.
When designing with the TLD2311EL, ensure that the maximum voltage drop across each channel stays within the SOA of the integrated output transistor. For LED strings with long chains, calculate the worst-case voltage drop and provide sufficient headroom. The PG-SSOP-14-5 exposed pad must be soldered to a sufficient copper area to maintain junction temperature below the thermal shutdown threshold.
This page synthesizes distributor pricing, LITIXβ’ Basic family drop-in alternatives, automotive lighting design notes, and PG-SSOP-14-5 thermal layout guidance that is not consolidated on the manufacturer product page.
Drop-in alternatives for TLD2311ELXUMA1 β 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 TLD2311ELXUMA1 (same form factor and footprint) β differing in Dimming Control, Package, Topology.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLD2311EL
β Drop-Inπ Reference alternative (not in catalog)
TLD2310EL
β Drop-Inπ Reference alternative (not in catalog)
TLD1125ELXUMA1
β Drop-Inβ In Stock
$0.85 / Unit
View Datasheet βTLD2311ELXUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | 3-channel high-side linear LED driver |
| Series | LITIX Basic |
| Number of Outputs | 3 |
| Output Current per Channel | 120 mA |
| Topology | Linear constant current source (high-side) |
| Dimming Control | PWM and analog/digital input |
| Package | PG-SSOP-14-5 (exposed pad) |
| Mounting Type | Surface Mount |
| Thermal Protection | Overtemperature shutdown |
| Diagnostic Features | Open-LED, short-LED, overtemperature detection |
| Qualification | Automotive grade (AEC-Q100 family) |
| RoHS Status | Compliant |
| Reel Quantity | 2500 (per packaging code XUMA1) |
TLD2311ELXUMA1 Pin Configuration
| Pin 1 | OUT1 β Channel 1 high-side current output (LED anode sense, 120 mA) |
| Pin 2 | IN1 β Channel 1 input supply |
| Pin 3 | PWM1 β Channel 1 PWM / enable input |
| Pin 4 | GND β Ground |
| Pin 5 | OUT2 β Channel 2 high-side current output (LED anode sense, 120 mA) |
| Pin 6 | IN2 β Channel 2 input supply |
| Pin 7 | PWM2 β Channel 2 PWM / enable input |
| Pin 8 | VS β Logic supply / diagnostic supply |
| Pin 9 | OUT3 β Channel 3 high-side current output (LED anode sense, 120 mA) |
| Pin 10 | IN3 β Channel 3 input supply |
| Pin 11 | PWM3 β Channel 3 PWM / enable input |
| Pin 12 | DIAG β Open-drain diagnostic output (open-LED / short-LED / thermal) |
| Pin 13 | SET β Current set reference |
| Pin 14 | EP β Exposed pad (thermal pad, must be soldered to copper) |
Typical Applications
TLD2311ELXUMA1 is suitable for 6 applications: Automotive Rear Combination Lamps, Daytime Running Lights (DRL), Interior Ambient Lighting, Status Indicator LED Strings, Turn-Signal and Hazard Modules, License Plate Illumination.
Automotive Rear Combination Lamps
The TLD2311ELXUMA1 drives brake, tail, and turn-signal LED strings in rear combination lamps with up to 120 mA per channel. Its three independent high-side outputs let one IC replace three discrete transistor circuits, while PWM dimming from the BCM ECU produces seamless tail-to-brake transition without relay flicker. The PG-SSOP-14-5 exposed pad keeps junction temperature within limits even at 100% duty-cycle brake illumination, and on-chip diagnostics flag open-LED or short-LED failures to the body controller for dashboard warning logic.
Recommended
Daytime Running Lights (DRL)
The TLD2311ELXUMA1 suits DRL LED strings because each of its three channels can be PWM-dimmed independently, enabling automatic brightness reduction at night without a separate analog dim interface. AEC-Q100 qualification and load-dump robustness let the module sit directly on the 12V automotive bus. Compared with a DC-DC LED driver, the linear topology avoids EMI that could interfere with adjacent RF receivers in the front bumper, and the small PG-SSOP-14-5 footprint fits inside compact DRL housings.
Recommended
Interior Ambient Lighting
In cabin ambient lighting modules the TLD2311ELXUMA1 controls three color or zone strings with smooth PWM dimming from 0% to 100% duty cycle, eliminating the audible flicker or buzz that switching LED drivers can couple into the cabin. The integrated diagnostics simplify ASIL-relevant failure handling because an open LED in a footwell or door-handle string is reported back to the BCM. With the exposed pad tied to chassis ground, EMI is essentially zero, preserving AM/FM and keyless-entry reception.
Recommended
Status Indicator LED Strings
Industrial control panels and appliance HMIs use the TLD2311ELXUMA1 to drive three status-indicator LEDs (power, fault, activity) with one IC rather than three discrete constant-current circuits. Each channel delivers 120 mA, sufficient for high-brightness through-hole or SMD LEDs. The PWM input allows the host MCU to dim indicators for night mode, and the on-chip open-LED diagnostic lets the system self-test the indicators at power-up without extra wiring.
Recommended
Turn-Signal and Hazard Modules
The TLD2311ELXUMA1 directly drives front and rear turn-signal LED strings, with one channel per side (left/right) plus a third channel for the mirror repeater or hazard indicator. The BCM generates the blink PWM pattern, and the linear driver ensures clean edges with no EMI ringing that could trigger automotive EMC tests. Open-LED detection immediately logs bulb-out conditions to the instrument cluster so the driver sees a hyperflash warning.
Recommended
License Plate Illumination
License plate lamps require uniform white-LED illumination across the plate area and must operate continuously while the parking or tail lamps are on. The TLD2311ELXUMA1 can drive up to three parallel LED strings of the plate lamp, balancing brightness without resistors and providing stable constant current despite temperature drift of the LEDs themselves. AEC-Q100 and load-dump tolerance let the lamp module share the same harness as the rear combination lamps.
Recommended
Recommended Products Summary
Engineering reference data for TLD2311ELXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLD2311EL | TLD2310EL | TLD1125ELXUMA1 |
|---|---|---|---|---|
| Package | PG-SSOP-14-5 | PG-SSOP-14-5 - same | PG-SSOP-14-5 - same | PG-SSOP-14-5 - same |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Number of Channels | 3 | 3 | 3 | 1 |
| Topology | Linear high-side | Linear high-side | Linear high-side | Linear high-side |
| PWM Dimming | Yes (per channel) | Yes (per channel) | Yes (per channel) | Yes |
| Diagnostic Output | Open-LED / short-LED / thermal | Open-LED / short-LED / thermal | Open-LED / short-LED / thermal | Open-LED / short-LED / thermal |
| Automotive Grade | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) |
Key Differentiators
- Three fully independent 120 mA channels in a single PG-SSOP-14-5 part (vs TLD1125ELXUMA1 (single-channel variant))
- Footprint-compatible across the LITIXβ’ Basic family (vs TLD2310EL (60 mA variant))
- Integrated open-LED, short-LED, and thermal diagnostics (vs Discrete transistor high-side LED driver)
Design Notes
The PG-SSOP-14-5 exposed pad is the primary heat-dissipation path. Estimated: at VIN=13.5V, VLED_string=9V (3 white LEDs), and IOUT=120 mA per channel x 3 channels, total dissipation is roughly (13.5V-9V) x 0.120A x 3 = 1.62W. This must be conducted into at least 200 mm^2 of 2 oz copper on the top layer to keep junction temperature below the thermal-shutdown threshold of approximately 150C. For 4-LED strings or higher battery voltages, expand the copper area proportionally.
Place each LED string close to its respective OUT/IN pins to minimize loop area and series inductance. The exposed pad must be soldered to a continuous copper plane with thermal vias to a bottom-side copper pour; do not split the thermal pad with signal traces because this raises junction-to-ambient thermal resistance. Decouple VS (logic supply) with a 100 nF ceramic capacitor placed within 3 mm of the VS pin.
Do not connect the LED strings in reverse polarity - the LITIXβ’ Basic high-side driver is not reverse-battery protected and will be damaged if the LED cathodes are tied to ground and the anodes to OUT. Always include a reverse-polarity protection diode or PTC at the lamp harness input. Also, ensure that the sum of LED forward voltages plus the driver's minimum headroom stays below the battery voltage during cranking dips (~6V); otherwise the LED current will collapse and the diagnostic will report an open LED falsely.
Keep the SET resistor trace short and shielded from switching noise because this node sets the channel current and any injected noise modulates LED brightness. Route the DIAG line away from PWM edges to avoid coupling glitches into the MCU interrupt. For multi-channel boards using two TLD2311EL parts, share the exposed-pad copper between adjacent devices to spread heat.
Compliance Information
AEC-Q100 qualified per Infineon LITIX Basic family datasheet. RoHS and REACH compliant. Halogen-free status not explicitly confirmed in available data.
