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STMicroelectronics L99LDLH32TR
- Part No.:
- L99LDLH32TR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 48-TFQFN Exposed Pad
- Datasheet:
-
L99LDLH32TR.pdf
- Description:
- 32 CHANNELS LED DRIVER WITH AUTO
- Quantity:
- Payment:
- Shipping:
Inventory:1,252
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Product details
Overview
L99LDLH32TR from STMicroelectronics is a 32-channel automotive LED driver IC with CAN FD Light interface, designed for high-reliability rear and ambient lighting systems. It integrates a 20 MHz dithered oscillator, supports 1–15 mA per channel (8-bit DAC programmable), delivers up to 35 V output voltage, and operates across 5.5 V–40 V supply and −40°C–150°C junction temperature.
For engineers reviewing the L99LDLH32TR datasheet, L99LDLH32TR pinout, L99LDLH32TR application, or L99LDLH32TR equivalent, key selection criteria include ASIL-compliant standalone/fail-safe operation, integrated 8-bit ADC diagnostics, fault bus signaling, and CAN FD Light protocol compliance per CiA DSP.
Technical Context
The L99LDLH32TR implements a high-precision linear current source architecture with 32 high-side constant-current outputs, each individually configurable via volatile RAM and non-volatile FTP memory. Its CAN FD Light transceiver supports broadcast and unicast frame types-including synchronization, wake-up, and global status reporting-enabling daisy-chain topology without external clocking.
It features dual-mode operation: Bus mode for networked control via CAN FD Light, and Standalone/Fail-Safe mode using direct input (DIN) for ASIL-B functional safety compliance. Diagnostics include per-channel open-load/short-circuit detection, thermal warning/shutdown, and NTC-based LED current derating-all reported via dedicated fault bus and internal 8-bit ADC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 32 high-side constant-current drivers, enabling independent control of OLED or LED strings in automotive lighting zones. |
| Current Range per Channel | 1 mA to 15 mA, set by 8-bit DAC; parallelable outputs support higher current per group. |
| Max Output Voltage | 35 V, allowing direct drive of multi-LED series strings without external boost stages. |
| Supply Voltage Range | 5.5 V to 40 V, compatible with 12 V and 24 V automotive battery systems including load dump transients. |
| Operating Temperature | −40°C to +150°C junction temperature, qualified per AEC-Q100 Grade 0 for under-hood and lamp housing use. |
| Interface Protocol | CAN FD Light compliant (CiA DSP), supporting up to 5 Mbit/s data rate with low-latency broadcast and unicast frames. |
| Oscillator | Integrated 20 MHz dithered oscillator with modulation-eliminates external quartz and reduces EMI during PWM dimming. |
Pinout & Package
QFN48L 7×7 mm package with exposed thermal pad (package code: QFN48L), optimized for automotive PCB thermal management and space-constrained lamp modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Main power supply input | Accepts 5.5–40 V automotive rail; feeds internal regulators and output drivers. |
| GND | Power and signal ground | Common reference for analog/digital domains and thermal pad connection point. |
| CAN_H / CAN_L | CAN FD Light differential bus interface | Compliant physical layer transceiver pins supporting wake-up, error framing, and bus arbitration. |
| DIN | Direct input for Standalone/Fail-Safe mode | Enables ASIL-compliant single-function-group control without CAN communication. |
| FAULT | Dedicated fault bus output | Open-drain line for aggregated diagnostic reporting across daisy-chained devices. |
| OUT0–OUT31 | 32 high-side current source outputs | Each drives LED anodes; supports slow turn-on/off and dithered clock for EMC optimization. |
| NTC | External NTC thermistor input | Enables junction temperature monitoring and automatic LED current derating for thermal safety. |
| VREF_PRE_REG | Pre-regulator feedback reference | Provides 1.25 V reference to external pre-regulator, minimizing power dissipation in linear stage. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL-ready Standalone Mode | Direct drive (DIN) path enables fail-safe operation meeting ASIL B requirements without CAN dependency. |
| Per-Channel Dimming Control | Independent 8-bit exponential PWM + 8-bit global PWM + 8-bit DAC current setting for precise luminance tuning. |
| Integrated Diagnostic Engine | On-chip 8-bit ADC monitors VLEDON, temperature, and fault states; reports via fault bus and RAM registers. |
| EMC-Optimized Timing | Gradual output delay, dithered clock, and programmable PWM frequency reduce radiated emissions in sensitive vehicle environments. |
| Thermal Derating Architecture | Combines on-die junction sensing and external NTC input to dynamically scale output current and prevent thermal runaway. |
Applications
| Automotive OLED Rear Lighting | Automotive Ambient Lighting |
|---|---|
Use Scenario: Dynamic brake light, turn signal, and position light control in slim-profile OLED tail lamps. IC Role / Device Role / Timing Role: 32-channel high-side driver delivering precise current to individual OLED segments with synchronized PWM dimming. Use Value: Enables pixel-level brightness control and fast response (<100 µs channel settling) for adaptive lighting signatures. | Use Scenario: Interior mood lighting with zone-specific color and intensity gradients across door panels, footwells, and dashboards. IC Role / Device Role / Timing Role: Constant-current source managing multiple low-current LED strings with independent exponential dimming curves. Use Value: Supports smooth 8-bit+8-bit dimming resolution and flicker-free operation at 200 Hz–2 kHz PWM frequencies. |
| Automotive Center High-Mount Stop Lamp (CHMSL) | Automotive License Plate Illumination |
Use Scenario: High-brightness, high-reliability stop lamp requiring thermal resilience and fault reporting in compact housings. IC Role / Device Role / Timing Role: Linear current regulator with overtemperature shutdown and short-circuit protection per channel. Use Value: Maintains stable output up to 150°C junction temperature and reports faults via FAULT bus to body controller. | Use Scenario: Low-power, long-life license plate lighting meeting ECE R87 photometric requirements. IC Role / Device Role / Timing Role: Precision 1–5 mA current source with open-load detection to ensure regulatory compliance and detect LED failure. Use Value: Guarantees minimum luminance via calibrated current accuracy (±5% over temp) and auto-diagnostic logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 32-channel automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC6C5912RTQR | 12-channel, SPI interface only; no CAN FD Light, no integrated oscillator, no fault bus. | Limited to low-channel-count, non-networked designs; lacks AEC-Q100 qualification and thermal derating. | Use where cost-sensitive, low-channel-count, and CAN-free systems dominate. |
| MAX20051ATP/V+T | Single-channel, high-voltage (65 V) linear driver; no multi-channel integration or CAN interface. | Requires external multiplexing for multi-LED control; no built-in diagnostics or daisy-chain capability. | Select when driving high-Vf LEDs (e.g., UV or high-power white) with minimal channel count. |
Compared with TLC6C5912RTQR and MAX20051ATP/V+T, the L99LDLH32TR uniquely combines 32-channel integration, CAN FD Light networking, ASIL-ready standalone mode, and embedded thermal management-making it the only solution qualified for full-featured automotive rear lighting ECUs.
Availability
L99LDLH32TR is available at Aetrix Electronics and suitable for automotive rear lighting, ambient lighting, CHMSL, and license plate illumination requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for L99LDLH32TR 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
STMicroelectronics is a global semiconductor leader specializing in automotive, power, and embedded solutions, with broad portfolio coverage from microcontrollers to analog and power ICs.
The L99LDLH32TR belongs to ST's automotive LED driver product line, engineered specifically for intelligent, networked, and safety-certified exterior and interior lighting systems in modern vehicles.
FAQ
What is the maximum number of L99LDLH32TR devices that can be daisy-chained on a single CAN FD Light bus?
Up to 32 L99LDLH32TR devices can be daisy-chained using CAN FD Light broadcast frames and unique Responder IDx assignment. Each device uses position-based addressing and supports chain initialization via dedicated broadcast commands defined in CiA DSP v1.0.
Does the L99LDLH32TR support both constant-current and constant-voltage LED driving modes?
No-the L99LDLH32TR operates exclusively in constant-current mode via its 32 high-side linear current sources. It does not regulate output voltage directly; instead, it maintains programmed current while supporting up to 35 V headroom, relying on external pre-regulation (via VREF_PRE_REG) for efficiency optimization.
How is thermal derating implemented, and what external components are required?
Thermal derating combines on-die junction temperature measurement and external NTC sensing on the NTC pin. The device reads the NTC voltage via its integrated 8-bit ADC and scales output current using pre-programmed derating curves stored in FTP memory-no external MCU or logic is needed.
Can the L99LDLH32TR operate without a CAN controller, and what functionality remains active?
Yes-in Standalone/Fail-Safe mode, the device accepts control signals via the DIN pin and operates independently of CAN. All 32 channels remain fully functional with analog/PWM dimming, diagnostics, fault bus reporting, and thermal protection-meeting ASIL-B requirements for critical lighting functions.
L99LDLH32TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-TFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- No
- Number of Outputs:
- 32
- Voltage - Supply (Min):
- 5.5V
- Voltage - Supply (Max):
- 28V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- 24mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VFQFPN (7x7)
L99LDLH32TR FAQ
1.How can I place an order for L99LDLH32TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L99LDLH32TR 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 L99LDLH32TR reliable?
The price and inventory of L99LDLH32TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L99LDLH32TR is usually 5 days.
3.What payment methods are accepted for L99LDLH32TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L99LDLH32TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L99LDLH32TR?
L99LDLH32TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L99LDLH32TR 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 L99LDLH32TR?
For technical support, including L99LDLH32TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L99LDLH32TR requirements.
6.How does Aetrix verify that L99LDLH32TR is sourced from the original manufacturer or authorized distributors?
All L99LDLH32TR 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 L99LDLH32TR meets industry standards.
7.What is the process for return or replacement of L99LDLH32TR?
All L99LDLH32TR units undergo pre-shipment inspection (PSI). If there is an issue with L99LDLH32TR, 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 L99LDLH32TR part is unused and in its original packaging.
Return procedure for L99LDLH32TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
L99LDLH32TR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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