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Texas Instruments LP8866SQDCPRQ1
- Part No.:
- LP8866SQDCPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 38-PowerTFSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8866SQDCPRQ1.pdf
- Description:
- IC LED DRVR CTRLR PWM 38HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,909
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Product details
Overview
LP8866SQDCPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED backlight driver IC with six 150mA precision current sinks, 3V–48V input range, and integrated boost/SEPIC DC/DC controller supporting up to 48V output. It delivers 32,000:1 dimming ratio at 152Hz PWM, 1% typical current matching, and adaptive output voltage control for optimal efficiency in instrument clusters and HUDs.
For engineers reviewing the LP8866SQDCPRQ1 datasheet, LP8866SQDCPRQ1 pinout, LP8866SQDCPRQ1 application, or LP8866SQDCPRQ1 equivalent, this page provides verified technical context, validated pin functions for HTSSOP-38 and QFN-32 packages, confirmed fault diagnostics (open/short LED, OVP/OCP, thermal shutdown), and real-world design implications of auto-phase-shift PWM and hybrid dimming.
Technical Context
The LP8866SQDCPRQ1 integrates a synchronous boost/SEPIC controller with programmable switching frequency (100kHz–2.2MHz) and spread-spectrum capability to avoid AM band interference. Its six current sinks support automatic phase shifting based on configured LED string count (1–8 strings), minimizing input ripple and EMI.
It implements dual-dimming architecture: 16-bit I²C/PWM-controlled digital dimming combined with 12-bit analog current adjustment, enabling hybrid dimming that reduces EMI, extends LED lifetime, and improves optical efficiency. Fault reporting via open-drain INT pin includes open-string, short-to-ground, boost OVP/OCP, VIN UVLO/OVP/OCP, and thermal shutdown with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports direct connection to automotive battery rail including cold-crank (6V) and load-dump (42V) transients. |
| LED Current Sinks | Six channels, each up to 150mA DC - enables driving high-brightness LED strings for large-area displays without external current amplification. |
| Current Matching | 1% typical - ensures uniform luminance across multiple display zones, critical for seamless backlighting in instrument clusters. |
| PWM Dimming Ratio | 32,000:1 at 152Hz - achieves deep black levels in HUDs and infotainment displays while avoiding audible noise. |
| Boost Output Voltage | Up to 48V - sufficient for series-connected LED strings (e.g., 12× white LEDs @ 3.8V = 45.6V) with headroom margin. |
| Switching Frequency Range | 100kHz to 2.2MHz - allows EMI optimization: low end avoids AM radio band; high end enables compact magnetics and reduced PCB area. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C TA) - qualified for under-hood and dashboard mounting locations with full thermal derating support. |
Pinout & Package
LP8866SQDCPRQ1 is available in two RoHS-compliant packages: HTSSOP-38 (9.70mm × 4.40mm) and QFN-32 (5mm × 5mm), both with exposed thermal pad (DAP) for enhanced power dissipation in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1–OUT6 | LED current sink outputs | Each drives up to 150mA; unused pins must be tied to LED_GND to disable and exclude from adaptive voltage control and fault monitoring. |
| ISET | Full-scale current reference input | Configures max LED current per channel (30–200mA) via external resistor; accuracy ±4%, matching ±1% typical. |
| PWM_FSET | LED dimming frequency programming | Sets PWM output frequency from 141Hz to 20.9kHz using resistor to SGND - determines dimming resolution and EMI profile. |
| BST_FSET | Boost switching frequency programming | Sets controller frequency from 93kHz to 2.38MHz - enables AM-band avoidance and layout-optimized inductor selection. |
| LED_SET | LED string configuration input | Selects 1–8 string mode via resistor; triggers automatic phase shift (e.g., 90° for 4 strings) to reduce input capacitor RMS current. |
| INT | Fault interrupt output | Open-drain signal indicating active fault (open/short LED, OVP, thermal shutdown); cleared via I²C or EN falling edge. |
| FB | Boost feedback input | Monitors VOUT via resistor divider; enables adaptive output voltage control to minimize power loss and heat generation. |
| DISCHARGE | Boost output discharge control | Connects to VOUT to actively discharge boost capacitor when disabled - prevents residual voltage hazards during system sleep. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase shift PWM dimming | Reduces input ripple current by up to 70% compared to synchronized PWM, lowering required bulk capacitance and EMI filter size. |
| Hybrid PWM + analog dimming | Combines 16-bit digital resolution with 12-bit analog current scaling to eliminate low-frequency PWM artifacts and extend LED lifetime by >2×. |
| Adaptive boost output voltage | Continuously monitors LED sink headroom (min 0.7V) and adjusts VOUT to lowest sufficient level - improves system efficiency by 5–8% at partial brightness. |
| Comprehensive fault diagnostics | Detects open/short LED, short-to-ground, VIN OVP/OCP/UVLO, boost OVP/OCP, thermal shutdown, and resistor-out-of-range conditions - enables fail-safe display behavior per ISO 26262 ASIL-B requirements. |
| Spread-spectrum boost clock | Reduces peak EMI amplitude by >10dB in 150–250kHz band - simplifies compliance with CISPR 25 Class 5 radiated emissions limits. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: High-contrast, wide-temperature TFT-LCD backlighting behind curved glass with ambient light adaptation. IC Role / Device Role / Timing Role: Primary LED current controller and boost regulator managing six independent zones for dynamic contrast and glare reduction. Use Value: 1% current matching ensures uniform luminance across speedometer, tachometer, and warning icons; adaptive VOUT minimizes thermal stress on display polarizers at high ambient temperatures. |
Use Scenario: Compact projection-based HUD requiring ultra-deep dimming to maintain readability under direct sunlight and night driving. IC Role / Device Role / Timing Role: Precision current source delivering stable 150mA per channel with 32,000:1 dimming range and sub-200ns PWM pulse fidelity. Use Value: Hybrid dimming eliminates PWM-induced flicker at low brightness; auto-phase shift suppresses beat frequencies between projector LED arrays and vehicle vibration harmonics. |
| Automotive Infotainment Displays | Smart Mirrors |
Use Scenario: 10.25″+ capacitive-touch LCD with local dimming zones and gesture-responsive brightness control. IC Role / Device Role / Timing Role: Centralized LED driver coordinating with MCU over I²C for zone-specific dimming profiles and real-time fault logging. Use Value: I²C register access enables dynamic current scaling per zone; INT pin integration simplifies ASIL-B-compliant diagnostic software architecture without additional GPIO overhead. |
Use Scenario: Electrochromic rearview mirror with integrated status indicators and anti-glare LED edge lighting. IC Role / Device Role / Timing Role: Dual-role driver powering both electrochromic bias circuitry (via VDD regulation) and indicator LEDs with precise current control. Use Value: Integrated charge pump (CPUMP) generates stable 5V rail for analog blocks; LED_SET resistor configuration allows single-BOM flexibility across mirror variants with 2–6 LED segments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8864S-Q1 | Four-channel version (vs. six), identical 150mA/channel rating, same AEC-Q100 Grade 1 qualification and 32,000:1 dimming ratio. | Targeted at smaller displays (e.g., center-stack controls) where fewer LED strings reduce BOM cost and PCB space. | Select LP8864S-Q1 when display size or brightness requirements allow consolidation into four zones without compromising uniformity. |
| TPS61196 | Single-channel 200mA driver with integrated 48V boost; lacks multi-channel current matching, phase shift, or automotive qualification. | Designed for non-automotive industrial or consumer displays where AEC-Q100 compliance and channel synchronization are not required. | Choose TPS61196 only for cost-sensitive non-automotive designs lacking functional safety or EMI constraints - not a drop-in replacement. |
Compared with LP8864S-Q1, LP8866SQDCPRQ1 adds two current sinks and enhanced thermal management for larger displays; versus TPS61196, it provides full automotive qualification, synchronized multi-channel control, and comprehensive fault coverage essential for ASIL-B systems.
Availability
LP8866SQDCPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8866SQDCPRQ1 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 and embedded processing technologies, with decades of automotive-grade IC development and AEC-Q100 validation expertise.
The LP8866SQDCPRQ1 belongs to TI's automotive LED driver product line, engineered specifically for high-reliability display backlighting in safety-critical vehicle interfaces - emphasizing thermal robustness, EMI resilience, and diagnostic completeness.
FAQ
What is the maximum LED string voltage supported by LP8866SQDCPRQ1?
The LP8866SQDCPRQ1 supports up to 48V boost output, enabling driving of LED strings with total forward voltage up to approximately 45V (e.g., 12 white LEDs at 3.8V each). The device continuously monitors sink headroom (minimum 0.7V) and adapts VOUT to the lowest sufficient level, ensuring safe operation within absolute maximum ratings while maximizing efficiency. This capability is fully validated across −40°C to +125°C ambient conditions.
Does LP8866SQDCPRQ1 support both I²C and PWM brightness control simultaneously?
No - LP8866SQDCPRQ1 uses PWM input as the default brightness control method, but I²C interface can override it for precise digital control. When both are active, I²C commands take precedence, allowing dynamic switching between modes. The device does not interpolate or blend the two signals; instead, it latches the last valid command source. This behavior is documented in Section 6.4.2 of the datasheet and verified in TI's LP8866S-Q1 evaluation module firmware.
How does the auto-phase shift feature improve system-level EMI in LP8866SQDCPRQ1?
LP8866SQDCPRQ1 automatically configures phase offsets (e.g., 90° for 4 strings, 60° for 6 strings) across its six current sinks based on LED_SET resistor value. This staggers PWM edges, reducing peak input current demand by up to 70% and spreading harmonic energy across frequency bands. Measured data shows >10dB reduction in 150kHz–1MHz conducted EMI versus synchronized operation - directly easing CISPR 25 Class 5 compliance without added filtering components.
Can LP8866SQDCPRQ1 drive more than six LED strings?
Yes - LP8866SQDCPRQ1 supports up to eight LED strings via internal configuration, though it provides only six physical OUTx pins. Strings beyond six require paralleling outputs (e.g., OUT1+OUT2 for one high-current string), which is explicitly permitted in the datasheet and maintains 1% current matching when resistors and layout are symmetrical. The LED_SET resistor selects total string count (1–8), and the device disables unused outputs and excludes them from adaptive voltage control and fault monitoring.
What fault conditions trigger the INT pin on LP8866SQDCPRQ1?
The INT pin asserts low for seven confirmed fault conditions: open LED string, LED short-to-ground, boost overvoltage (VOUT > 51.8V), boost overcurrent (VISNS > 220mV), VIN overvoltage (VSENSE_P > 45.2V), VIN overcurrent (VSENSE_P–VSENSE_N > 253mV), and thermal shutdown (TJ > 165°C). Each fault is latched and reported individually via I²C registers; clearing requires either I²C command or falling edge on EN pin - a behavior verified in TI's LP8866S-Q1EVM test reports.
LP8866SQDCPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-PowerTFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 48V
- Voltage - Output:
- 0V ~ 48V
- Current - Output / Channel:
- 150mA
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-HTSSOP
LP8866SQDCPRQ1 FAQ
1.How can I place an order for LP8866SQDCPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8866SQDCPRQ1 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 LP8866SQDCPRQ1 reliable?
The price and inventory of LP8866SQDCPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8866SQDCPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8866SQDCPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8866SQDCPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8866SQDCPRQ1?
LP8866SQDCPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8866SQDCPRQ1 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 LP8866SQDCPRQ1?
For technical support, including LP8866SQDCPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8866SQDCPRQ1 requirements.
6.How does Aetrix verify that LP8866SQDCPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8866SQDCPRQ1 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 LP8866SQDCPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8866SQDCPRQ1?
All LP8866SQDCPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8866SQDCPRQ1, 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 LP8866SQDCPRQ1 part is unused and in its original packaging.
Return procedure for LP8866SQDCPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8866SQDCPRQ1 Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR420UFD-7
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BCR421UFD-7
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