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Texas Instruments LP8866QDCPRQ1
- Part No.:
- LP8866QDCPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 38-PowerTFSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8866QDCPRQ1.pdf
- Description:
- IC LED DRVR CTRLR PWM 38HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8866QDCPRQ1 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 1% typical current matching, 32,000:1 dimming ratio at 152Hz PWM, and adaptive output voltage control for optimal efficiency in instrument cluster and HUD backlighting.
For engineers reviewing the LP8866QDCPRQ1 datasheet, LP8866QDCPRQ1 pinout, LP8866QDCPRQ1 application, or LP8866QDCPRQ1 equivalent, this page provides verified technical context, HTSSOP-38 package mapping, I²C + PWM dual-dimming support, fault diagnostics (open/short LED, OVP/UVP, thermal shutdown), and validated automotive-grade alternatives for display power design.
Technical Context
The LP8866QDCPRQ1 integrates a programmable boost/SEPIC DC/DC controller (100kHz–2.2MHz switching frequency) with adaptive VOUT regulation based on real-time LED headroom monitoring across all six channels. Its auto-phase-shift PWM dimming dynamically adjusts phase offset per active channel count (e.g., 90° for 4 strings), reducing input ripple and EMI.
It supports hybrid dimming-combining 16-bit I²C or PWM-controlled digital dimming with 12-bit analog current scaling-and includes comprehensive fault detection: open/short-to-ground LED, boost overcurrent/voltage, VIN OVP/UVP/OCP, ISET/BST_FSET resistor out-of-range, and thermal shutdown at 165°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports direct battery connection across automotive cold-crank (4.5V) to load-dump (42V) transients. |
| LED Current Sinks | Six channels, each up to 200mA DC - enables driving high-brightness LED strings without external current amplification. |
| Current Matching | 1% typical - ensures uniform luminance across multi-string displays, critical for HUD and cluster visual consistency. |
| Dimming Ratio | 32,000:1 at 152Hz PWM - achieves deep black levels in ambient-light-adaptive displays without visible flicker. |
| Boost Output Voltage | Up to 48V - sufficient for series-connected LED strings (e.g., 12× white LEDs @ 3.6V = 43.2V). |
| Switching Frequency | 100kHz to 2.2MHz - avoids AM radio band (530–1710kHz) and enables compact magnetics with high-frequency operation. |
| Ambient Temp Range | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard mounting locations. |
Pinout & Package
LP8866QDCPRQ1 is packaged in a 38-pin HTSSOP (9.70mm × 4.40mm) with exposed thermal pad (DAP) for enhanced heat dissipation in automotive environments. Pin functions are validated per TI SNVSBA5C datasheet Rev. May 2024.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Internal power supply rail | 3.3V/5V input for analog/digital blocks; requires 10μF decoupling to PGND/SGND. |
| EN | Enable control input | Logic-high (>1.2V) activates device; falling edge clears INT fault latch. |
| OUT1–OUT6 | LED current sink outputs | Each drives up to 200mA; unused pins must be tied to LED_GND to disable and prevent fault reporting. |
| ISET | Full-scale current programming | External resistor sets max current per channel (30–200mA); accuracy ±4% over temp. |
| PWM | Brightness control input | Accepts 100Hz–20kHz PWM signal; resolution drops from 16-bit (100Hz) to 10-bit (20kHz). |
| INT | Fault interrupt output | Open-drain signal asserts low on any fault (LED open/short, OVP, thermal shutdown); cleared via I²C or EN toggle. |
| SCL/SDA | I²C interface | Standard 400kHz bus for register access, dimming control, and fault status readback. |
| BST_FSET | Boost frequency programming | Resistor to SGND sets switching frequency from 100kHz to 2.2MHz; enables spread spectrum when BST_SYNC = VDD. |
| PWM_FSET | LED dimming frequency programming | Resistor to SGND selects PWM output frequency (141Hz–20.9kHz); determines achievable dimming ratio. |
| LED_SET | String configuration input | Resistor to SGND configures active string count (1–8); triggers automatic phase-shift alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase shift PWM dimming | Dynamically distributes PWM timing across active channels to reduce input capacitor RMS current and system EMI by up to 40%. |
| Adaptive boost output voltage | Continuously monitors LED headroom (min 0.7V) and adjusts VOUT to lowest sufficient level, improving efficiency by 5–10% vs fixed-output designs. |
| Hybrid dimming architecture | Combines 16-bit digital PWM with 12-bit analog current scaling to eliminate low-frequency PWM artifacts while extending LED lifetime. |
| Comprehensive fault diagnostics | Detects open/short-to-ground LED, boost OVP/UVP/OCP, VIN OVP/UVP/OCP, thermal shutdown, and external resistor faults - all reportable via INT pin and I²C registers. |
| Charge pump for gate drive | Integrated 5V CPUMP output (±2% accuracy) enables efficient N-FET gate driving without external LDO, reducing BOM count and board space. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: High-contrast, wide-temperature TFT-LCD backlighting behind analog gauges and digital speedometers. IC Role / Device Role / Timing Role: Six-channel current sink driver with adaptive boost and auto-phase PWM ensures uniform brightness across segmented LED zones and eliminates visible ripple during rapid gauge sweeps. Use Value: 1% current matching maintains color fidelity across 125°C operating range; 32,000:1 dimming enables seamless transition from daylight to night vision modes. | Use Scenario: Projection-based HUD requiring precise luminance control and minimal thermal drift on windshield-combiner optics. IC Role / Device Role / Timing Role: LED driver with thermal shutdown (165°C) and VIN OVP protection safeguards against engine-bay thermal excursions and alternator load-dump events. Use Value: Adaptive VOUT reduces power loss by 7% at partial brightness; hybrid dimming eliminates PWM-induced speckle noise in optical path. |
| Automotive Infotainment Displays | Smart Mirrors |
Use Scenario: 10.25″+ capacitive-touch center-stack displays needing dynamic local dimming and AM-band EMI compliance. IC Role / Device Role / Timing Role: Boost controller with 100kHz–2.2MHz programmable frequency avoids 530–1710kHz AM radio interference; I²C allows real-time zone dimming updates. Use Value: Spread spectrum (enabled via BST_SYNC = VDD) lowers peak EMI by 12dB; 16-bit dimming resolution supports HDR content rendering. | Use Scenario: Electrochromic or OLED-based rearview mirrors with ambient-light adaptive backlighting and condensation resistance. IC Role / Device Role / Timing Role: Fault-tolerant driver with open/short LED detection prevents single-string failure from disabling full mirror illumination. Use Value: LED short-to-ground detection (<0.24V threshold) identifies moisture-induced failures early; AEC-Q100 Grade 1 ensures reliability at –40°C startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8864QDCPRQ1 | Four 200mA channels; identical boost controller, pinout, and feature set except reduced channel count. | Suitable for smaller displays (e.g., 7″ clusters) where six strings are unnecessary; saves PCB area and cost. | Select when display LED count ≤ 4 strings and BOM simplification is prioritized over future scalability. |
| TPS61196RGER | Single-channel 200mA driver with integrated 48V boost; no I²C, no auto-phase shift, no comprehensive fault reporting. | Targeted at cost-sensitive, non-safety-critical displays lacking diagnostic requirements; lacks AEC-Q100 Grade 1 certification. | Choose only for non-automotive or auxiliary displays where functional safety and multi-string synchronization are not required. |
Compared with LP8866QDCPRQ1, LP8864QDCPRQ1 offers identical performance per channel but scales down to four outputs-reducing layout complexity without compromising thermal or EMI behavior-while TPS61196RGER trades diagnostics, synchronization, and qualification for lower unit cost in less demanding applications.
Availability
LP8866QDCPRQ1 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 LP8866QDCPRQ1 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 ICs, with decades of experience in high-reliability power management solutions.
The LP8866QDCPRQ1 belongs to TI's automotive LED driver product line, engineered specifically for AEC-Q100-compliant display backlighting in safety-critical vehicle domains including instrumentation, HUD, and ADAS interfaces.
FAQ
What is the maximum LED string voltage supported by the LP8866QDCPRQ1?
The LP8866QDCPRQ1 supports up to 48V output from its integrated boost/SEPIC controller. This allows driving series-connected LED strings totaling up to ~12 white LEDs (at 3.6V VF each) or ~15 red/amber LEDs (at 2.2V VF each) while maintaining ≥0.7V headroom per channel. The adaptive VOUT regulation continuously adjusts to the minimum required voltage, optimizing efficiency across varying LED forward voltage and temperature conditions.
Does the LP8866QDCPRQ1 support both I²C and PWM dimming simultaneously?
No - the LP8866QDCPRQ1 uses I²C or PWM as independent brightness control methods, not concurrently. PWM input is the default hardware control; I²C provides software-configurable dimming, register access, and fault readback. When PWM is active, I²C dimming commands are ignored. Both methods support 16-bit resolution at low frequencies (e.g., 100Hz), though PWM resolution degrades to 10-bit at 20kHz per datasheet Section 5.5.
How does the LP8866QDCPRQ1 handle thermal overload?
The LP8866QDCPRQ1 incorporates a thermal shutdown circuit that triggers at 165°C (typical) junction temperature and releases at 150°C (typical) with 20°C hysteresis. Upon activation, the device disables all LED drivers and boost converter, asserts the open-drain INT pin low, and holds shutdown until temperature falls below the release threshold. Recovery is automatic - no reset or EN toggle is required beyond thermal cooldown.
Can unused LED outputs on the LP8866QDCPRQ1 be left floating?
No - unused OUT1–OUT6 pins on the LP8866QDCPRQ1 must be tied directly to LED_GND. Leaving them floating causes undefined behavior, potential fault reporting (e.g., open-string detection), and disruption of adaptive VOUT regulation. Grounding unused outputs disables those channels cleanly and excludes them from headroom monitoring and phase-shift calculations, ensuring stable operation of active strings.
What external components are mandatory for basic LP8866QDCPRQ1 operation?
Mandatory external components for LP8866QDCPRQ1 include: (1) 10μF VDD decoupling capacitor to PGND/SGND; (2) ISET resistor (15.6kΩ–104kΩ) to set per-channel current; (3) BST_FSET resistor (3.92kΩ–124kΩ) to configure boost switching frequency; (4) LED_SET resistor to define active string count; (5) FB resistor divider to set maximum boost output voltage; and (6) 4.7μF CPUMP decoupling capacitor if charge pump is enabled. All are specified in TI SNVSBA5C Section 8.
LP8866QDCPRQ1 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:
- 200mA
- 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
LP8866QDCPRQ1 FAQ
1.How can I place an order for LP8866QDCPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8866QDCPRQ1 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 LP8866QDCPRQ1 reliable?
The price and inventory of LP8866QDCPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8866QDCPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8866QDCPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8866QDCPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8866QDCPRQ1?
LP8866QDCPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8866QDCPRQ1 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 LP8866QDCPRQ1?
For technical support, including LP8866QDCPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8866QDCPRQ1 requirements.
6.How does Aetrix verify that LP8866QDCPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8866QDCPRQ1 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 LP8866QDCPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8866QDCPRQ1?
All LP8866QDCPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8866QDCPRQ1, 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 LP8866QDCPRQ1 part is unused and in its original packaging.
Return procedure for LP8866QDCPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8866QDCPRQ1 Tags
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