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Texas Instruments LP8866SQRHBRQ1
- Part No.:
- LP8866SQRHBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP8866SQRHBRQ1.pdf
- Description:
- IC LED DRV CTRL PWM 150MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,196
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Product details
Overview
LP8866SQRHBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED backlight driver IC with six 150mA high-precision current sinks, 32,000:1 dimming ratio at 152Hz PWM, and integrated 48V boost/SEPIC controller operating from 3V–48V input. It delivers adaptive output voltage control, auto-phase-shift PWM dimming, and real-time fault diagnostics for instrument clusters and HUDs.
For engineers reviewing the LP8866SQRHBRQ1 datasheet, LP8866SQRHBRQ1 pinout, LP8866SQRHBRQ1 application, or LP8866SQRHBRQ1 equivalent, this page provides verified technical context, package-specific pin functions, I²C/PWM dual-dimming implementation details, thermal and ESD ratings per AEC-Q100, and validated alternative options for automotive display power management.
Technical Context
The LP8866SQRHBRQ1 integrates a synchronous boost/SEPIC DC/DC controller (100kHz–2.2MHz programmable switching frequency) with adaptive VOUT regulation based on real-time LED headroom monitoring across all six current sinks. Its hybrid dimming architecture combines 16-bit I²C-controlled PWM and 12-bit analog current scaling to reduce EMI while preserving LED lifetime and optical efficiency.
It implements automatic phase shifting across active OUTx channels (e.g., 90° shift in 4-string mode), open/short-to-ground LED detection, VIN OVP/OCP/UVLO, boost OVP/UVP, thermal shutdown (165°C trip), and resistor-based configuration of LED current (via ISET), dimming frequency (PWM_FSET), boost frequency (BST_FSET), and string count (LED_SET).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports wide automotive battery rail including cold-crank and load-dump transients. |
| Max LED Sink Current | 150mA per channel - precise current regulation enables uniform brightness across multi-string displays. |
| Current Matching | 1% typical - minimizes luminance variation between LED strings without external calibration. |
| Dimming Ratio | 32,000:1 at 152Hz - enables deep-black contrast in HUDs and infotainment under varying ambient light. |
| Boost Output Voltage | Up to 48V - sufficient headroom for 12–16 LED series strings in high-brightness automotive applications. |
| Switching Frequency | 100kHz to 2.2MHz - adjustable via BST_FSET resistor to avoid AM radio band interference. |
| Ambient Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and dashboard mounting. |
Pinout & Package
LP8866SQRHBRQ1 is available in HTSSOP-38 (9.70mm × 4.40mm) and QFN-32 (5mm × 5mm) packages. This part uses the HTSSOP-38 variant, with exposed thermal pad (DAP) connected to LED_GND for enhanced thermal dissipation in high-power backlight designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Internal power supply input | Bias source for analog/digital blocks; requires 10μF decoupling to PGND/SGND. |
| EN | Enable control input | Active-high logic input; falling edge clears fault interrupt (INT) and resets internal state. |
| OUT1–OUT6 | LED current sink outputs | Each drives up to 150mA; unused pins must be tied to GND to disable and exclude from fault monitoring. |
| ISET | Full-scale current programming | Resistor sets max current (30–200mA); accuracy ±4%, matching ±1% across channels. |
| PWM | Brightness control input | Accepts 100Hz–20kHz PWM signal; resolution drops from 16-bit (100Hz) to 10-bit (20kHz). |
| SCL/SDA | I²C interface | Standard 400kHz bus; supports register read/write for dimming, fault status, and configuration. |
| INT | Fault interrupt output | Open-drain signal asserted low on any fault (open/short LED, OVP, thermal shutdown, etc.). |
| BST_FSET | Boost frequency setting | Resistor to SGND selects switching frequency from 100kHz to 2.2MHz for EMI optimization. |
| PWM_FSET | LED dimming frequency setting | Resistor to SGND configures PWM output frequency from 141Hz to 20.9kHz. |
| LED_SET | String count configuration | Resistor selects 1–8 LED strings; device auto-adjusts phase shift and disables unused outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase-shift PWM dimming | Reduces input ripple current and EMI by distributing switching events across active LED channels. |
| Adaptive boost voltage control | Minimizes power loss by dynamically adjusting VOUT to just above the highest LED string forward voltage. |
| Hybrid dimming (PWM + analog) | Combines 16-bit PWM resolution with 12-bit analog current scaling to extend dimming range and reduce flicker. |
| Comprehensive fault diagnostics | Detects open/shorted LED strings, short-to-ground, VIN OVP/OCP/UVLO, boost OVP/UVP, thermal shutdown, and resistor out-of-range conditions. |
| Charge pump support | Generates 5V ±2% for gate drive (GD) and internal bias; eliminates need for external LDO in high-side FET configurations. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: High-brightness, high-contrast TFT-LCD backlight requiring stable luminance across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Six-channel LED driver with adaptive boost and auto-phase-shift PWM ensures uniform illumination and minimal EMI near sensitive RF receivers. Use Value: 32,000:1 dimming ratio maintains readability in direct sunlight and nighttime driving; AEC-Q100 Grade 1 qualification guarantees reliability over vehicle lifetime. |
Use Scenario: Compact projection-based HUD with tight thermal constraints and stringent EMI limits near ADAS radar bands. IC Role / Device Role / Timing Role: Integrated boost controller with spread-spectrum synchronization (BST_SYNC) avoids interference with 77GHz radar systems. Use Value: Programmable 100kHz–2.2MHz switching frequency enables placement outside AM/FM/ADAS bands; thermal shutdown (165°C) protects optics during prolonged operation. |
| Automotive Infotainment Displays | Smart Mirrors |
Use Scenario: 10–12-inch center-stack display with dynamic local dimming zones and touch-integrated bezel lighting. IC Role / Device Role / Timing Role: I²C-configurable LED current and dimming parameters enable software-defined brightness profiles and zone-specific gamma correction. Use Value: 16-bit I²C dimming resolution allows smooth transitions between daylight and night modes; built-in fault reporting simplifies diagnostic log generation. |
Use Scenario: Electrochromic or OLED-based rearview mirror with ambient-light-adaptive backlight and anti-glare functionality. IC Role / Device Role / Timing Role: Dual-dimming path (I²C + PWM) supports both MCU-controlled global dimming and analog sensor-driven real-time adjustment. Use Value: 12-bit analog dimming extends low-end linearity below 1% brightness; LED short-to-ground detection prevents false triggers during mirror actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED-backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8864SQRHBRQ1 | Four 150mA channels; identical boost controller, pinout, and feature set except reduced channel count. | Suitable for smaller displays (e.g., digital cockpits ≤7″) where six channels are unnecessary. | Select when BOM cost reduction is prioritized and total LED current demand ≤600mA. |
| LM3409QMHX/NOPB | Single-channel automotive LED controller; no integrated current sinks, requires external MOSFETs and sense resistors. | Used in high-current single-string applications (e.g., DLP projector lamps) where flexibility outweighs integration. | Choose when designing custom topologies (buck-boost, flyback) or needing >150mA per string with discrete FET selection. |
Compared with LP8866SQRHBRQ1, LP8864SQRHBRQ1 offers identical performance per channel but reduces system complexity for lower-string-count displays, while LM3409QMHX/NOPB trades integration for topology freedom and higher per-string current capability-neither is pin-compatible, but both serve adjacent automotive backlight requirements.
Availability
LP8866SQRHBRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, infotainment systems, and smart mirrors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8866SQRHBRQ1 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive-grade power management solutions with decades of automotive qualification expertise.
The LP8866SQRHBRQ1 belongs to TI's automotive LED driver product line, designed specifically for high-reliability display backlighting in safety-critical cockpit applications with emphasis on EMI resilience, thermal robustness, and functional safety readiness.
FAQ
What is the maximum LED string voltage supported by the LP8866SQRHBRQ1?
The LP8866SQRHBRQ1 supports up to 48V boost output, enabling it to drive LED strings with combined forward voltages up to ~45V (accounting for 0.7V headroom per channel). This accommodates typical automotive configurations of 12–16 white LEDs in series at 3.5V each, with margin for temperature drift and aging.
Does the LP8866SQRHBRQ1 support both I²C and PWM dimming simultaneously?
No-the LP8866SQRHBRQ1 uses either I²C or PWM for brightness control, not both concurrently. The MODE pin selects dimming method: PWM mode uses the PWM input signal directly, while I²C mode disables PWM input and accepts brightness commands via register writes to LEDx_BRIGHTNESS[15:0]. Configuration is fixed at power-up.
How does the LP8866SQRHBRQ1 handle thermal protection?
The LP8866SQRHBRQ1 features internal thermal shutdown that activates at 165°C (typical) and releases at 150°C (typical), with 20°C hysteresis. When triggered, all LED drivers and boost converter disable, INT asserts low, and the device remains latched off until EN is cycled or temperature falls below release threshold-ensuring safe recovery in automotive environments.
Can unused OUTx pins be left floating on the LP8866SQRHBRQ1?
No-unused OUTx pins (e.g., OUT4–OUT6 in a 3-string configuration) must be tied to ground. Leaving them floating disables internal fault monitoring for those channels but may cause undefined behavior or increased leakage. Grounding ensures predictable disablement and exclusion from adaptive VOUT calculation and current matching analysis.
What is the purpose of the DISCHARGE pin on the LP8866SQRHBRQ1?
The DISCHARGE pin connects directly to the boost output (VOUT) and enables rapid discharge of the output capacitor when the boost converter is disabled. This prevents residual voltage from sustaining LED current after shutdown, improving system safety and reducing power leakage in sleep modes-critical for always-on automotive displays meeting ISO 26262 ASIL-B requirements.
LP8866SQRHBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0V ~ 48V
- Current - Output / Channel:
- 150mA
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-VQFN (5x5)
LP8866SQRHBRQ1 FAQ
1.How can I place an order for LP8866SQRHBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8866SQRHBRQ1 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 LP8866SQRHBRQ1 reliable?
The price and inventory of LP8866SQRHBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8866SQRHBRQ1 is usually 5 days.
3.What payment methods are accepted for LP8866SQRHBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8866SQRHBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8866SQRHBRQ1?
LP8866SQRHBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8866SQRHBRQ1 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 LP8866SQRHBRQ1?
For technical support, including LP8866SQRHBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8866SQRHBRQ1 requirements.
6.How does Aetrix verify that LP8866SQRHBRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8866SQRHBRQ1 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 LP8866SQRHBRQ1 meets industry standards.
7.What is the process for return or replacement of LP8866SQRHBRQ1?
All LP8866SQRHBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8866SQRHBRQ1, 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 LP8866SQRHBRQ1 part is unused and in its original packaging.
Return procedure for LP8866SQRHBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8866SQRHBRQ1 Tags
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