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Texas Instruments LP8864QDCPRQ1
- Part No.:
- LP8864QDCPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 38-PowerTFSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8864QDCPRQ1.pdf
- Description:
- IC LED DRVR CTRLR PWM 38HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8864QDCPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED backlight driver IC with four 200mA precision current sinks, 3V–48V input range, and integrated boost/SEPIC DC/DC 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 clusters and HUDs.
For engineers reviewing the LP8864QDCPRQ1 datasheet, LP8864QDCPRQ1 pinout, LP8864QDCPRQ1 application, or LP8864QDCPRQ1 equivalent, key selection factors include its quad-channel 200mA sink capability, auto-phase-shift PWM dimming, I²C + analog dimming interface, boost spread-spectrum EMI reduction, and comprehensive fault diagnostics including open/short LED detection.
Technical Context
The LP8864QDCPRQ1 integrates a high-efficiency boost/SEPIC controller (100kHz–2.2MHz programmable switching frequency) with adaptive output voltage regulation based on real-time LED headroom monitoring across all four current sinks. Its hybrid dimming architecture combines 16-bit I²C/PWM dimming and 12-bit analog current control to minimize EMI and extend LED lifetime.
It implements autonomous phase shifting-90° per channel in 4-string mode-with automatic channel enable/disable based on LED_SET resistor configuration. Fault management includes dedicated open-string, short-to-ground, overvoltage, overcurrent, and thermal shutdown detection, with interrupt reporting via open-drain INT pin and register-accessible status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports wide automotive battery and load-dump conditions without external pre-regulation. |
| LED Current Sink Max | 200mA per channel - enables direct driving of high-brightness LED strings without external amplification. |
| Current Matching | 1% (typical) - ensures uniform luminance across multiple display zones in instrument clusters and HUDs. |
| PWM Dimming Ratio | 32,000:1 at 152Hz - achieves deep black levels and smooth brightness transitions for high-contrast displays. |
| Boost Output Voltage | Up to 48V - sufficient for series-connected LED strings in large-format automotive displays. |
| Dimming Resolution | 16-bit via I²C or PWM input - provides fine-grained brightness control for dynamic contrast management. |
| Switching Frequency Range | 100kHz to 2.2MHz - avoids AM radio band interference and allows optimization of magnetics size vs. efficiency. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C TA) - qualified for under-hood and dashboard mounting locations. |
Pinout & Package
LP8864QDCPRQ1 is packaged in HTSSOP-38 (9.70mm × 4.40mm) with exposed thermal pad tied to LED_GND. Pin functions are validated per TI SNVSBD2B Rev. May 2024 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Internal power supply input | Bias source for analog/digital blocks; requires 10μF decoupling to GND. |
| EN | Enable control input | Active-high logic input (1.2V threshold); resets fault status on falling edge. |
| OUT1–OUT4 | LED current sink outputs | Four independent 200mA sinks; unused pins must be tied to GND to disable. |
| ISET | Full-scale current programming | Resistor sets max sink current (30–200mA); accuracy ±4% over temperature. |
| PWM | Analog brightness control | Direct PWM input (100Hz–20kHz); supports 16-bit resolution at low frequencies. |
| SDA/SCL | I²C interface | Standard 400kHz I²C bus for register access, dimming control, and fault readback. |
| INT | Fault interrupt output | Open-drain signal indicating active fault; cleared via I²C or EN deassertion. |
| BST_SYNC | Boost clock synchronization | Accepts external clock or configures spread spectrum (tie to VDD/GND). |
| FB | Boost feedback input | Resistor-divider sets max boost voltage; device dynamically adjusts to minimum required headroom. |
| DISCHARGE | Boost output discharge | Active-low control to rapidly discharge VOUT when boost is disabled, preventing residual glow. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase-shift PWM dimming | Eliminates beat frequencies and reduces EMI by automatically adjusting phase offset between channels based on configured string count (e.g., 90° for 4 strings). |
| Adaptive boost voltage control | Monitors headroom across all LED sinks in real time and regulates VOUT to the lowest sufficient level-reducing power loss and heat generation. |
| Hybrid dimming architecture | Combines 16-bit PWM and 12-bit analog current control to suppress low-frequency flicker while maintaining high-resolution brightness scaling. |
| Comprehensive fault diagnostics | Detects open/short LED strings, short-to-ground, VIN OVP/UVP/OCP, boost OVP/OCP, thermal shutdown, and external resistor out-of-range conditions. |
| Spread-spectrum boost operation | Reduces peak EMI emissions by modulating switching frequency-configurable via BST_SYNC pin or external clock sync. |
| Charge pump support | Integrated charge pump (5.0V ±2%) enables gate drive for external high-side FETs without requiring auxiliary supplies. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: High-reliability backlighting for TFT-LCD or OLED gauges with variable ambient light and wide temperature operation. IC Role / Device Role / Timing Role: Quad-channel LED driver with adaptive boost and auto-phase-shift PWM ensures uniform brightness, minimal EMI, and fast response to dimming commands. Use Value: Maintains legibility across −40°C to +125°C ambient, eliminates visual artifacts during rapid brightness transitions, and meets CISPR-25 Class 5 EMI limits. |
Use Scenario: Compact, high-luminance projection backlight requiring precise current matching and ultra-deep dimming for contrast preservation. IC Role / Device Role / Timing Role: Four synchronized 200mA current sinks deliver stable optical output; 32,000:1 dimming ratio enables true black states in bright daylight. Use Value: Enables >1000:1 contrast ratio in sunlight-readable HUDs while reducing thermal stress on optics and LEDs through adaptive voltage control. |
| Automotive Infotainment Displays | Smart Mirrors |
Use Scenario: Central touchscreen backlight with dynamic content-aware dimming and safety-critical fault reporting. IC Role / Device Role / Timing Role: I²C-configurable driver with interrupt-driven fault detection (open/short LED, thermal, OVP) for ASIL-B–compatible system monitoring. Use Value: Supports fail-safe display behavior (e.g., partial dimming or warning indication) upon fault detection, meeting ISO 26262 functional safety requirements. |
Use Scenario: Electrochromic or OLED-based rearview mirror with anti-glare functionality requiring silent, flicker-free dimming control. IC Role / Device Role / Timing Role: Low-EMI hybrid dimming engine with 12-bit analog + 16-bit PWM control eliminates visible modulation artifacts during gradual dimming transitions. Use Value: Prevents driver distraction by eliminating perceptible PWM strobing during slow brightness ramping-critical for mirror applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8866QDCPRQ1 | Six 200mA current sinks; identical boost controller, pinout, and feature set-adds two extra channels and dual I²C addresses. | Required for 5–6 string displays; same PCB layout except for added OUT5/OUT6 routing and I²C address configuration. | Select LP8866QDCPRQ1 when driving ≥5 LED strings or requiring redundant I²C addressing in multi-display systems. |
| LM3409QMYX/NOPB | Single-channel automotive LED controller with external MOSFET drive; no integrated current sinks, I²C, or auto-phase shift. | Used in discrete high-power LED designs where thermal management favors external FETs and channel count is ≤2. | Choose LM3409QMYX/NOPB only for cost-sensitive, low-channel-count designs where full integration is not required. |
Compared with LP8866QDCPRQ1, LP8864QDCPRQ1 offers identical performance per channel but omits two outputs-reducing BOM cost and PCB area for 4-string applications. Versus LM3409QMYX/NOPB, LP8864QDCPRQ1 delivers higher integration, superior current matching, and built-in diagnostics-enabling faster time-to-market for complex automotive displays.
Availability
LP8864QDCPRQ1 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 LP8864QDCPRQ1 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 AEC-Q100 qualification experience.
The LP8864QDCPRQ1 belongs to TI's automotive LED driver product line, engineered specifically for high-reliability, high-efficiency backlighting in safety-critical display systems-including digital clusters and AR-HUDs-where precision current control and robust fault handling are mandatory.
FAQ
What is the maximum LED string voltage supported by the LP8864QDCPRQ1?
The LP8864QDCPRQ1 supports up to 48V boost output voltage, enabling it to drive series-connected LED strings with forward voltages totaling ≤48V. This accommodates typical automotive configurations such as 12–16 white LEDs (3.0–3.6V each) in series per channel, with headroom margin for temperature drift and aging. The device dynamically adjusts VOUT to the minimum required level using real-time feedback from the FB pin.
Does the LP8864QDCPRQ1 support both I²C and PWM dimming simultaneously?
No-the LP8864QDCPRQ1 uses either I²C or PWM for primary brightness control, selected via the MODE pin resistor configuration. However, it supports hybrid dimming: 12-bit analog current adjustment (via I²C registers) combined with 16-bit PWM dimming to achieve extended effective resolution and reduced EMI. The MODE pin determines whether PWM input or I²C commands take precedence for global dimming.
How does the LP8864QDCPRQ1 handle thermal protection?
The LP8864QDCPRQ1 incorporates a thermal shutdown circuit that activates at TJ = 165°C (typical) and releases at 150°C (typical), with 20°C hysteresis. When triggered, the device disables all LED sinks and boost converter, asserts the INT pin, and holds in shutdown until temperature falls below the release threshold. This protects against permanent damage during sustained overload or poor heatsinking conditions in automotive environments.
Can the LP8864QDCPRQ1 drive more than four LED strings?
The LP8864QDCPRQ1 has four dedicated current sink outputs (OUT1–OUT4), but supports up to eight configurable LED strings via internal channel multiplexing and phase-shifting modes set by the LED_SET resistor. In 8-string mode, it alternates current sinking across pairs of outputs-e.g., OUT1/OUT2 share one phase, OUT3/OUT4 another-enabling higher total string count while maintaining 200mA per active sink path.
What fault conditions does the LP8864QDCPRQ1 detect and report?
The LP8864QDCPRQ1 detects and reports open LED strings, shorted LED strings, LED short-to-ground, boost overvoltage/overcurrent, input overvoltage/undervoltage/overcurrent, thermal shutdown, and out-of-range configuration resistors (ISET, LED_SET, PWM_FSET, BST_FSET, MODE). All faults assert the open-drain INT pin and are individually readable via I²C register 0x1E (FAULT_STATUS), enabling precise root-cause diagnosis in automotive systems.
LP8864QDCPRQ1 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:
- 4
- 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
LP8864QDCPRQ1 FAQ
1.How can I place an order for LP8864QDCPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8864QDCPRQ1 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 LP8864QDCPRQ1 reliable?
The price and inventory of LP8864QDCPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8864QDCPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8864QDCPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8864QDCPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8864QDCPRQ1?
LP8864QDCPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8864QDCPRQ1 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 LP8864QDCPRQ1?
For technical support, including LP8864QDCPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8864QDCPRQ1 requirements.
6.How does Aetrix verify that LP8864QDCPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8864QDCPRQ1 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 LP8864QDCPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8864QDCPRQ1?
All LP8864QDCPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8864QDCPRQ1, 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 LP8864QDCPRQ1 part is unused and in its original packaging.
Return procedure for LP8864QDCPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8864QDCPRQ1 Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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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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