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Texas Instruments LP8866QRHBRQ1
- Part No.:
- LP8866QRHBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP8866QRHBRQ1.pdf
- Description:
- IC LED DRVR CTRL PWM 200MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,748
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Product details
Overview
LP8866QRHBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED backlight driver IC with six 200mA precision current sinks, 3V–48V input range, and integrated boost/SEPIC 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 infotainment display backlighting.
For engineers reviewing the LP8866QRHBRQ1 datasheet, LP8866QRHBRQ1 pinout, LP8866QRHBRQ1 application, or LP8866QRHBRQ1 equivalent, key selection criteria include automotive-grade fault diagnostics (open/short LED, OVP/OCP, thermal shutdown), hybrid PWM/analog dimming support, I²C + PWM dual control interface, and configurable switching frequency (100kHz–2.2MHz) for AM-band EMI avoidance.
Technical Context
The LP8866QRHBRQ1 integrates a synchronous boost/SEPIC DC/DC controller with adaptive VOUT regulation based on real-time LED headroom monitoring across all six current sinks. Its auto-phase-shift PWM dimming dynamically adjusts phase offset per active channel count (e.g., 90° for 4 strings), minimizing input ripple and EMI.
It supports dual dimming control: 16-bit resolution via I²C register writes or external PWM input (100Hz–20kHz), plus 12-bit analog current scaling. Fault reporting occurs through open-drain INT pin with I²C-clearable status registers covering LED open/short-to-ground, boost OVP/OCP, VIN UVLO/OVP/OCP, and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports direct connection to automotive battery rail with transient tolerance up to 48V. |
| LED Current Sink Max | 200mA per channel - enables driving high-brightness LED strings without external amplification. |
| Current Matching | 1% typical - ensures uniform luminance across multi-string displays in instrument clusters and HUDs. |
| Dimming Ratio | 32,000:1 at 152Hz - achieves deep black levels required for high-contrast automotive displays. |
| Boost Switching Freq | 100kHz to 2.2MHz - avoids AM radio band (530–1710kHz) via programmable BST_FSET resistor. |
| Thermal Shutdown | 165°C activation - protects die during sustained overloads while maintaining AEC-Q100 Grade 1 operation (−40°C to +125°C TA). |
| I²C Interface | Standard-mode (400kHz) - enables real-time brightness adjustment and fault register readback without PWM timing constraints. |
Pinout & Package
LP8866QRHBRQ1 is packaged in a 32-pin QFN (RHB) with 5mm × 5mm body size and exposed thermal pad (DAP). Pin functions are validated per TI SNVSBA5C Rev. May 2024 datasheet, Table 4-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1–OUT6 | LED current sink outputs | Each drives up to 200mA; unused pins must be tied to LED_GND to disable and exclude from fault monitoring. |
| ISET | Full-scale current reference | External resistor sets max current per string (30–200mA); accuracy ±4% over temp. |
| PWM_FSET | LED dimming frequency control | Resistor selects PWM output frequency from 141Hz to 20.9kHz - determines dimming resolution and EMI profile. |
| BST_FSET | Boost switching frequency control | Resistor configures 100kHz–2.2MHz switching - critical for EMI compliance and inductor sizing. |
| LED_SET | String configuration input | Resistor selects 1–8 configured strings; device auto-adjusts phase shift and adaptive VOUT accordingly. |
| INT | Fault interrupt output | Open-drain signal asserts low on any fault (LED open/short, OVP, thermal, etc.); cleared via I²C or EN falling edge. |
| SCL/SDA | I²C interface | Supports 400kHz standard-mode communication for register access, dimming control, and diagnostic readback. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase-shift PWM dimming | Reduces input capacitor RMS current by distributing switching events across channels - extends capacitor life and lowers EMI. |
| Adaptive boost output voltage | Minimizes power loss by dynamically adjusting VOUT to just above the highest LED string forward voltage - improves system efficiency up to 95%. |
| Hybrid PWM + analog dimming | Combines 16-bit PWM resolution with 12-bit analog current scaling to reduce LED stress and extend lifetime versus pure PWM. |
| Comprehensive fault diagnostics | Detects open/shorted LEDs, short-to-ground, VIN OVP/OCP/UVLO, boost OVP/OCP, thermal shutdown, and resistor-out-of-range conditions - enables fail-safe display operation. |
| Spread spectrum boost mode | Enabled via BST_SYNC = VDD - dithers switching frequency to lower peak EMI emissions without changing average frequency. |
Applications
| Automotive Infotainment Display | Automotive Instrument Cluster |
|---|---|
Use Scenario: High-resolution LCD or OLED center console display requiring uniform brightness and deep dimming in varying ambient light. IC Role / Device Role / Timing Role: Primary LED backlight driver managing six independent current channels with synchronized phase-shifted PWM for ripple reduction. Use Value: 32,000:1 dimming ratio and 1% current matching ensure consistent color fidelity and contrast across full luminance range. | Use Scenario: Digital gauge cluster with segmented or full-graphic TFT requiring dynamic brightness adaptation during day/night transitions. IC Role / Device Role / Timing Role: Adaptive VOUT-controlled boost driver delivering stable current to multiple LED zones under wide input voltage transients (cold crank, load dump). Use Value: 3V–48V input range and AEC-Q100 Grade 1 qualification guarantee reliable operation across automotive battery conditions. |
| Smart Mirror Display | Heads-Up Display (HUD) |
Use Scenario: Electrochromic or LCD-based rearview mirror with integrated display elements needing low-noise, high-precision current control. IC Role / Device Role / Timing Role: Six-channel current sink providing matched drive to discrete LED segments behind reflective surface. Use Value: 1% current matching prevents visible luminance gradients; hybrid dimming reduces flicker perception at low brightness. | Use Scenario: Compact HUD projector requiring ultra-stable LED current and minimal thermal drift for optical alignment integrity. IC Role / Device Role / Timing Role: Precision LED driver with thermal shutdown (165°C) and real-time fault reporting via INT pin for safety-critical illumination path. Use Value: Built-in LED short/open detection prevents thermal runaway; adaptive VOUT maintains constant luminance despite temperature-induced Vf shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8864QRHBRQ1 | Four 200mA channels; identical architecture, package, and feature set except reduced channel count. | Suitable for smaller displays with ≤4 LED strings; shares same pinout and register map but fewer OUTx pins. | Select when display requires only four strings - reduces BOM cost and layout area without sacrificing dimming performance or diagnostics. |
| TPS61196RHBR | Non-automotive grade; 6-channel, 150mA max per channel; no AEC-Q100 qualification or thermal shutdown at 165°C. | Limited to industrial or consumer displays; lacks automotive fault coverage (no LED short-to-ground, no VIN OCP). | Consider only for non-safety-critical applications where AEC-Q100 compliance and extended fault diagnostics are not required. |
Compared with LP8866QRHBRQ1, LP8864QRHBRQ1 offers identical dimming resolution and diagnostics in a 4-channel variant, while TPS61196RHBR provides lower-current capability without automotive qualification - making LP8866QRHBRQ1 the sole choice for AEC-Q100-compliant 6-string HUD or cluster designs.
Availability
LP8866QRHBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, digital instrument clusters, and heads-up displays requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LP8866QRHBRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive power management and LED driver solutions.
The LP8866-Q1 product line was designed specifically for high-reliability automotive display backlighting, emphasizing AEC-Q100 compliance, adaptive efficiency optimization, and comprehensive fault coverage for safety-critical human-machine interfaces.
FAQ
What is the maximum LED current per channel supported by the LP8866QRHBRQ1?
The LP8866QRHBRQ1 supports up to 200mA DC current per LED current sink channel (OUT1–OUT6). This maximum is set via the external ISET resistor and can be scaled down digitally using the LEDx_CURRENT[11:0] register bits over I²C. The device also limits current to 280mA if the ISET pin is shorted to ground, providing overcurrent protection.
Does the LP8866QRHBRQ1 support both I²C and PWM dimming simultaneously?
No - the LP8866QRHBRQ1 supports either I²C-based dimming or external PWM input, but not both simultaneously. When PWM is applied to the PWM pin, it overrides I²C brightness commands. The MODE pin selects between PWM-only, I²C-only, or hybrid modes where I²C sets baseline current and PWM fine-tunes brightness. Configuration is fixed at power-up via the MODE resistor.
How does the LP8866QRHBRQ1 achieve adaptive boost output voltage control?
The LP8866QRHBRQ1 continuously monitors the voltage headroom across all active LED current sinks (OUT1–OUT6) and adjusts the boost converter's output voltage (VOUT) to the minimum level required to maintain regulation. This is implemented via feedback from the FB pin, which senses the highest forward voltage among active strings. By minimizing VOUT, the device reduces power loss in the boost stage and improves overall system efficiency - especially at partial brightness.
What fault conditions does the LP8866QRHBRQ1 detect and report via the INT pin?
The LP8866QRHBRQ1 reports faults including LED open-circuit, LED short-to-ground, LED shorted-string, boost overvoltage (OVP), boost overcurrent (OCP), VIN overvoltage (OVP), VIN undervoltage (UVLO), VIN overcurrent (OCP), thermal shutdown (165°C), and out-of-range configuration resistors (ISET, BST_FSET, PWM_FSET, LED_SET, MODE). All faults assert the open-drain INT pin low and are individually readable via I²C status registers.
Can the LP8866QRHBRQ1 drive more than six LED strings?
No - the LP8866QRHBRQ1 has exactly six dedicated current sink outputs (OUT1–OUT6). However, multiple strings can be paralleled per output channel (e.g., two strings per OUTx) to increase total current per node, provided thermal and voltage headroom limits are respected. The LED_SET resistor configures the number of *active* strings (1–8), and the device auto-adjusts phase shift and adaptive VOUT accordingly - but physical drive capability remains limited to six terminals.
LP8866QRHBRQ1 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:
- 200mA
- 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)
LP8866QRHBRQ1 FAQ
1.How can I place an order for LP8866QRHBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8866QRHBRQ1 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 LP8866QRHBRQ1 reliable?
The price and inventory of LP8866QRHBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8866QRHBRQ1 is usually 5 days.
3.What payment methods are accepted for LP8866QRHBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8866QRHBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8866QRHBRQ1?
LP8866QRHBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8866QRHBRQ1 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 LP8866QRHBRQ1?
For technical support, including LP8866QRHBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8866QRHBRQ1 requirements.
6.How does Aetrix verify that LP8866QRHBRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8866QRHBRQ1 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 LP8866QRHBRQ1 meets industry standards.
7.What is the process for return or replacement of LP8866QRHBRQ1?
All LP8866QRHBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8866QRHBRQ1, 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 LP8866QRHBRQ1 part is unused and in its original packaging.
Return procedure for LP8866QRHBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8866QRHBRQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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