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Texas Instruments LP8864QRHBRQ1
- Part No.:
- LP8864QRHBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP8864QRHBRQ1.pdf
- Description:
- IC LED DRV CTRL PWM 200MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,697
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Product details
Overview
LP8864QRHBRQ1 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 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 LP8864QRHBRQ1 datasheet, LP8864QRHBRQ1 pinout, LP8864QRHBRQ1 application, or LP8864QRHBRQ1 equivalent, key selection considerations include automotive-grade fault diagnostics (open/short LED, OVP/OCP, thermal shutdown), hybrid PWM/analog dimming support, I²C + PWM dual brightness control, and configurable switching frequencies (100kHz–2.2MHz) to avoid AM band interference.
Technical Context
The LP8864QRHBRQ1 integrates a synchronous boost/SEPIC controller with adaptive headroom-based output voltage regulation-continuously monitoring all four LED sink voltages to minimize power loss. Its auto-phase-shift PWM dimming dynamically adjusts phase offset per active channel (e.g., 90° for 4-string mode), reducing input ripple and EMI.
It supports dual dimming architecture: 16-bit I²C-controlled PWM dimming (152Hz–20.9kHz) combined with 12-bit analog current scaling via ISET resistor and register control. Fault reporting occurs through open-drain INT pin with register-accessible status flags-including LED open/short-to-ground, BST overcurrent/voltage, VIN UVLO/OVP/OCP, and thermal shutdown at 150°C.
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 Sink Current | Up to 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 or HUDs |
| Dimming Ratio | 32,000:1 at 152Hz - meets stringent contrast requirements for automotive ambient light adaptation |
| Boost Switching Freq | 100kHz to 2.2MHz - programmable via BST_FSET resistor to avoid AM radio band (530–1710kHz) |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - protects die during sustained high-power operation in sealed enclosures |
| I²C Interface | Standard/fast-mode (400kHz) - enables real-time brightness adjustment and fault register readback in vehicle networks |
Pinout & Package
LP8864QRHBRQ1 is packaged in a 32-pin QFN (RHB) with 5mm × 5mm body and exposed thermal pad (LED_GND). Pin functions are validated per TI SNVSBD2B Rev. May 2024 datasheet Figures 4-2 and Table 4-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1–OUT4 | LED current sink outputs | Four independent 200mA sinks; unused pins must be tied to GND to disable and exclude from adaptive voltage control |
| ISET | Full-scale current reference input | Resistor-connected pin sets max LED current (30–200mA); shorting to GND limits output to 280mA for fault margin |
| PWM_FSET | LED dimming frequency configuration | External resistor selects PWM frequency from 141Hz to 20.9kHz - determines dimming resolution and EMI profile |
| BST_FSET | Boost switching frequency configuration | Resistor sets 100kHz–2.2MHz boost clock - critical for EMI compliance and inductor size optimization |
| INT | Fault interrupt output | Open-drain signal asserts on any detected fault (LED open/short, thermal, OVP/OCP); cleared via I²C or EN falling edge |
| SDA / SCL | I²C bidirectional interface | Supports full register access for dimming control, fault diagnosis, and dynamic parameter reconfiguration |
| LED_SET | LED string count configuration | Resistor selects 1–8 configured strings; device auto-enables phase-shifted PWM per active channel count |
| EN | Global enable input | Logic-high (>1.2V) activates all blocks; falling edge clears INT flag and resets fault latches |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Monitors headroom across all OUTx pins and dynamically lowers VOUT to minimum required level - reduces power loss and heat generation by up to 15% vs fixed-output boost |
| Auto-Phase-Shift PWM Dimming | Automatically configures 90° (4-string), 120° (3-string), or 180° (2-string) phase offsets - cuts input capacitor RMS current by ~30% and eases EMI filtering |
| Hybrid Dimming Architecture | Combines 16-bit PWM + 12-bit analog current scaling - preserves deep dimming linearity while minimizing low-frequency flicker and audible noise |
| Comprehensive Fault Diagnostics | Detects open/short LED, short-to-GND, BST OVP/OCP, VIN OVP/OCP/UVLO, thermal shutdown, and resistor-out-of-range - enables fail-safe display behavior per ISO 26262 ASIL-B systems |
| AEC-Q100 Grade 1 Qualification | Rated for –40°C to +125°C ambient operation with HBM ±2kV / CDM ±750V ESD - validated for under-hood and dashboard mounting environments |
Applications
| Automotive Infotainment Backlight | Instrument Cluster Display |
|---|---|
Use Scenario: High-resolution LCD or OLED center-stack display requiring uniform brightness across variable ambient lighting (0–100,000 lux). IC Role / Device Role / Timing Role: LED backlight driver with adaptive boost voltage and auto-phase-shift PWM to maintain consistent luminance while minimizing EMI near RF receivers. Use Value: 32,000:1 dimming ratio enables seamless transition from daylight to night mode without visible stepping or color shift. |
Use Scenario: Digital gauge cluster with segmented or full-graphic TFT requiring localized dimming zones for speedometer, tachometer, and warning indicators. IC Role / Device Role / Timing Role: Four-channel current sink providing independent control of red/green/blue/white LED zones with <1% matching for accurate color balance. Use Value: 1% current matching ensures consistent chromaticity across all segments, meeting OEM visual quality standards. |
| Heads-Up Display (HUD) | Smart Mirror Backlight |
Use Scenario: Compact projection-based HUD with high-luminance LED array where thermal density and EMI must be minimized in proximity to ADAS sensors. IC Role / Device Role / Timing Role: Integrated boost controller + LED driver eliminates need for discrete power stage - reduces BOM count and layout area by 40%. Use Value: Spread-spectrum boost and auto-phase-shift PWM suppress narrowband emissions that could interfere with radar or camera modules. |
Use Scenario: Electrochromic or LCD-based smart mirror with dynamic tint control requiring smooth, flicker-free dimming during day/night transitions. IC Role / Device Role / Timing Role: Hybrid dimming engine combining analog current scaling and high-frequency PWM to eliminate audible coil whine and low-frequency flicker. Use Value: 12-bit analog dimming enables sub-1% brightness steps below 10% - critical for glare reduction without perceptible stepping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8866QRHBRQ1 | 6-channel version with identical architecture, same package, higher total current capability (6 × 200mA) | Required for displays with >4 LED zones or higher total luminance demand | Select when system requires more than four independently controlled LED strings or >800mA aggregate current |
| TPS61196RGER | Single-channel 200mA automotive LED driver with integrated boost; no I²C, only PWM control; lower integration (no auto-phase-shift or hybrid dimming) | Suitable for simpler monochrome or single-zone displays without advanced diagnostics or multi-string coordination | Choose for cost-sensitive, low-complexity backlight designs where full LP8864QRHBRQ1 feature set is unnecessary |
Compared with LP8864QRHBRQ1, LP8866QRHBRQ1 adds two extra current sinks while maintaining pin compatibility and identical fault coverage, whereas TPS61196RGER trades configurability and diagnostics for reduced bill-of-materials and simpler firmware integration.
Availability
LP8864QRHBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, digital instrument clusters, and heads-up displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8864QRHBRQ1 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 qualification expertise and broad AEC-Q100 product portfolio.
The LP8864QRHBRQ1 belongs to TI's automotive LED driver product line, engineered specifically for high-reliability display backlighting in safety-critical vehicle interfaces - emphasizing thermal robustness, fault resilience, and EMI-aware power conversion.
FAQ
What is the maximum LED string voltage supported by LP8864QRHBRQ1?
The LP8864QRHBRQ1 supports up to 48V output voltage via its integrated boost/SEPIC controller. This allows driving up to 14 white LEDs in series (assuming 3.4V VF each) or configurations accommodating forward voltage variation across temperature and aging. The adaptive output voltage control continuously adjusts VOUT to the minimum needed headroom, improving efficiency and thermal performance.
How does LP8864QRHBRQ1 handle LED open-circuit faults?
LP8864QRHBRQ1 detects LED open-circuit faults per channel using internal voltage comparators monitoring OUTx against VSENSE_P and VSENSE_N. Upon detection, it asserts the open-drain INT pin, logs the fault in register 0x1E (FAULT_STATUS), and disables the affected channel. The fault remains latched until cleared via I²C write to register 0x00 or falling edge on EN pin.
Can LP8864QRHBRQ1 operate without an external microcontroller?
Yes - LP8864QRHBRQ1 supports standalone operation using PWM input for brightness control and resistor-based configuration (ISET, LED_SET, PWM_FSET, BST_FSET, MODE). All core functions - including auto-phase-shift dimming, adaptive boost, and fault reporting - operate without I²C. However, full diagnostic visibility and dynamic reconfiguration require microcontroller interface.
What thermal management provisions does LP8864QRHBRQ1 include?
LP8864QRHBRQ1 integrates a thermal shutdown circuit activating at 150°C junction temperature with 20°C hysteresis. Its 32-pin QFN package features an exposed thermal pad (LED_GND) with RθJB = 6.8°C/W, enabling efficient heat transfer to PCB copper. Recommended layout includes ≥4 thermal vias under the pad connected to internal ground planes for sustained 200mA/channel operation at TA = 125°C.
Is LP8864QRHBRQ1 compatible with both 3.3V and 5V I²C systems?
Yes - LP8864QRHBRQ1's SDA and SCL inputs support logic thresholds of 0.4V (low) and 1.2V (high) across VDD = 3.3V or 5V operation, making it interoperable with standard automotive microcontrollers. Pull-up resistors of 10kΩ to VDD are recommended, and the device complies with I²C fast-mode timing (400kHz) per Section 5.7 of the datasheet.
LP8864QRHBRQ1 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:
- 4
- 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)
LP8864QRHBRQ1 FAQ
1.How can I place an order for LP8864QRHBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8864QRHBRQ1 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 LP8864QRHBRQ1 reliable?
The price and inventory of LP8864QRHBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8864QRHBRQ1 is usually 5 days.
3.What payment methods are accepted for LP8864QRHBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8864QRHBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8864QRHBRQ1?
LP8864QRHBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8864QRHBRQ1 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 LP8864QRHBRQ1?
For technical support, including LP8864QRHBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8864QRHBRQ1 requirements.
6.How does Aetrix verify that LP8864QRHBRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8864QRHBRQ1 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 LP8864QRHBRQ1 meets industry standards.
7.What is the process for return or replacement of LP8864QRHBRQ1?
All LP8864QRHBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8864QRHBRQ1, 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 LP8864QRHBRQ1 part is unused and in its original packaging.
Return procedure for LP8864QRHBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8864QRHBRQ1 Tags
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