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Texas Instruments LP8864SQRHBRQ1
- Part No.:
- LP8864SQRHBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP8864SQRHBRQ1.pdf
- Description:
- IC LED DRV CTRL PWM 150MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,902
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Product details
Overview
LP8864SQRHBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED backlight driver with four 150mA 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 infotainment display backlighting.
For engineers reviewing the LP8864SQRHBRQ1 datasheet, LP8864SQRHBRQ1 pinout, LP8864SQRHBRQ1 application, or LP8864SQRHBRQ1 equivalent, this page provides verified technical context on its hybrid PWM/analog dimming architecture, fault diagnostics (open/short LED, OVP/OCP, thermal shutdown), and configuration via I²C or external resistors (BST_FSET, PWM_FSET, ISET, LED_SET).
Technical Context
The LP8864SQRHBRQ1 integrates a synchronous boost/SEPIC DC/DC controller with programmable switching frequency (100kHz–2.2MHz) and spread-spectrum capability to minimize EMI in AM-sensitive automotive environments. Its adaptive VOUT regulation continuously monitors LED sink headroom (0.7V typ.) and dynamically adjusts boost voltage to the minimum required level.
Four independent current sinks support auto-phase-shift PWM dimming-configurable via LED_SET resistor-and operate with 16-bit I²C or PWM brightness control. Fault management includes open-string, short-to-ground, VIN OVP/OCP/UVLO, boost OVP/OCP, thermal shutdown (150°C trip), and resistor-out-of-range detection on ISET/BST_FSET/PWM_FSET pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports direct connection to automotive battery rail with transient tolerance. |
| LED Current Sink Max | 150mA per channel - enables driving 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 - achieves deep black levels in ambient-light-adaptive displays. |
| Boost Switching Freq | 100kHz to 2.2MHz - avoids AM radio band (530–1710kHz) and enables compact magnetics. |
| Ambient Temp Range | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard placement. |
| I²C Interface | Standard-mode (400kHz) - allows real-time brightness adjustment and fault register readback. |
Pinout & Package
LP8864SQRHBRQ1 is packaged in a 38-pin HTSSOP (9.70mm × 4.40mm) with exposed thermal pad (DAP) connected to LED_GND. Pin functions are validated per TI SNVSBD3B Rev. May 2024.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Bias for internal analog/digital blocks; requires 10μF decoupling to GND. |
| EN | Enable control | Active-high logic input (VENIH = 1.2V); initiates full device startup sequence. |
| OUT1–OUT4 | LED current sink outputs | Four independent 150mA sinks; unused pins must be tied to LED_GND to disable. |
| ISET | Full-scale current programming | Resistor sets max current (30–200mA); accuracy ±4% over temp and line. |
| PWM | Brightness control input | Direct PWM dimming interface; supports 100Hz–20kHz input with 16-bit resolution at 100Hz. |
| INT | Fault interrupt output | Open-drain signal indicating any active fault; cleared via I²C or EN falling edge. |
| BST_SYNC | Boost clock synchronization | Accepts external clock or configures spread spectrum (tie to VDD) / disable (tie to GND). |
| FB | Boost feedback input | Resistor divider from VOUT sets max boost voltage; enables adaptive headroom tracking. |
| LED_SET | String configuration | Resistor selects 1–8 LED string count; determines auto-phase-shift angle (e.g., 90° for 4 strings). |
| PWM_FSET / BST_FSET | Frequency programming | External resistors set LED dimming (141–20.9kHz) and boost switching (100kHz–2.2MHz) frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase-shift PWM dimming | Reduces input ripple current and EMI by staggering LED sink activation based on configured string count. |
| Hybrid PWM + 12-bit analog dimming | Combines digital PWM for wide dynamic range with analog current scaling to eliminate low-frequency flicker. |
| Adaptive boost output voltage | Minimizes power loss by dynamically adjusting VOUT to just exceed the highest LED string forward voltage. |
| Comprehensive fault diagnostics | Detects open/short LED, short-to-GND, VIN OVP/OCP/UVLO, boost OVP/OCP, thermal shutdown, and resistor faults. |
| Charge pump for gate drive | Generates 5V (±2%) from VDD to drive external N-FETs via GD pin with 4.7µF CPUMP decoupling. |
Applications
| Automotive Infotainment Display | Automotive Instrument Cluster |
|---|---|
Use Scenario: High-resolution LCD or OLED center-stack display requiring uniform brightness, local dimming, and AM-band EMI compliance. IC Role / Device Role / Timing Role: Primary LED backlight driver managing up to 8 strings with auto-phase-shift PWM and adaptive boost voltage control. Use Value: Enables 32,000:1 contrast ratio and <1% luminance variation across display zones while meeting CISPR 25 Class 5 radiated emissions limits. |
Use Scenario: Digital gauge cluster with segmented or full-graphic TFT requiring cold-start operation down to –40°C and high reliability. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 LED driver delivering stable 150mA per channel with built-in open/short LED fault reporting. Use Value: Eliminates need for external fault monitoring circuitry and supports fail-safe illumination modes via INT pin and I²C register access. |
| Smart Mirror Display | Heads-Up Display (HUD) |
Use Scenario: Electrochromic or LCD-based rearview mirror with ambient-light-adaptive dimming and glare reduction. IC Role / Device Role / Timing Role: Dual-role driver supporting both low-current status indicators and high-brightness mirror backlight zones. Use Value: 12-bit analog dimming eliminates visible PWM artifacts at low brightness, critical for night-driving visual comfort. |
Use Scenario: Projection-based HUD requiring precise luminance control across wide temperature range and vibration environments. IC Role / Device Role / Timing Role: High-accuracy current sink driver with 1% matching and thermal derating compensation for optical path stability. Use Value: Maintains consistent projected image brightness despite engine bay temperature swings from –40°C to +125°C ambient. |
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 | Six-channel version (vs. four); identical pinout, package, and feature set except for additional OUT5/OUT6 and extended I²C register map. | Required when >4 LED strings or higher total current (>600mA) is needed; shares same layout and firmware adaptation path. | Select LP8866QRHBRQ1 only if system design scales beyond four independent backlight zones. |
| TPS61196RGER | Single-channel 150mA automotive LED driver with integrated boost; lacks multi-channel phase shift, I²C, and advanced diagnostics of LP8864SQRHBRQ1. | Suitable for simple monochrome segment displays or auxiliary lighting-not for multi-zone RGB or high-dynamic-range backlighting. | Choose TPS61196RGER only for cost-sensitive, single-string applications where diagnostic depth and dimming flexibility are secondary. |
Compared with LP8864SQRHBRQ1, LP8866QRHBRQ1 offers direct scalability to six strings with zero layout change, while TPS61196RGER trades integration and diagnostics for lower BOM count in non-critical lighting roles.
Availability
LP8864SQRHBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, digital instrument clusters, smart mirrors, and heads-up displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8864SQRHBRQ1 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 automotive qualification expertise and AEC-Q100-compliant product development.
The LP8864SQRHBRQ1 belongs to TI's automotive LED driver portfolio, designed specifically for high-reliability, high-efficiency display backlighting in safety-critical vehicle interfaces including clusters, infotainment, and HUDs.
FAQ
What is the maximum LED string current supported by the LP8864SQRHBRQ1?
The LP8864SQRHBRQ1 supports up to 150mA per channel across its four independent current sinks. This is set via the external ISET resistor and can be scaled down digitally using the LEDx_CURRENT[11:0] register bits over I²C. The absolute maximum sink current is 200mA per channel, with 280mA limiting if ISET is shorted to GND - but 150mA is the rated operational maximum for sustained performance and thermal safety in automotive environments.
Does the LP8864SQRHBRQ1 support both PWM and I²C dimming simultaneously?
No - the LP8864SQRHBRQ1 uses PWM input as the default brightness control method, but I²C can override it for precise digital control. When I²C writes to the LED brightness registers, it takes precedence over the PWM pin signal. The device does not blend or combine both inputs; instead, it operates in one mode at a time, with I²C offering higher resolution (16-bit) and diagnostics access that PWM alone cannot provide.
How does the LP8864SQRHBRQ1 achieve EMI reduction in automotive AM radio bands?
The LP8864SQRHBRQ1 reduces EMI through three coordinated mechanisms: (1) programmable boost switching frequency (100kHz–2.2MHz) to avoid the 530–1710kHz AM band, (2) optional spread-spectrum modulation enabled via BST_SYNC tied to VDD, and (3) auto-phase-shift PWM dimming that staggers LED sink activation to cancel input ripple harmonics. These features collectively meet CISPR 25 Class 5 radiated emissions requirements without external shielding.
What fault conditions does the LP8864SQRHBRQ1 detect and report via the INT pin?
The LP8864SQRHBRQ1 reports 11 distinct fault conditions via its open-drain INT pin: open LED string, shorted LED, LED short-to-ground, VIN overvoltage/overcurrent/undervoltage, boost overvoltage/overcurrent, thermal shutdown (>150°C), and out-of-range resistor faults on ISET, BST_FSET, PWM_FSET, LED_SET, or MODE pins. All faults are latched and readable via I²C register 0x1A, and cleared either by I²C write or falling edge on EN.
Can the LP8864SQRHBRQ1 drive more than four LED strings?
Yes - the LP8864SQRHBRQ1 supports up to eight LED strings via configurable parallel connection of its four current sinks. Using the LED_SET resistor, users select 1–8 strings; the device automatically configures phase-shift angles (e.g., 90° for 4 strings, 45° for 8 strings) and disables unused OUTx pins. Each physical output remains limited to 150mA, so higher total current requires paralleling channels - confirmed in TI's LP8864S-Q1 datasheet Section 6.1 and Figure 8-4.
LP8864SQRHBRQ1 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:
- 150mA
- 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)
LP8864SQRHBRQ1 FAQ
1.How can I place an order for LP8864SQRHBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8864SQRHBRQ1 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 LP8864SQRHBRQ1 reliable?
The price and inventory of LP8864SQRHBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8864SQRHBRQ1 is usually 5 days.
3.What payment methods are accepted for LP8864SQRHBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8864SQRHBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8864SQRHBRQ1?
LP8864SQRHBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8864SQRHBRQ1 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 LP8864SQRHBRQ1?
For technical support, including LP8864SQRHBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8864SQRHBRQ1 requirements.
6.How does Aetrix verify that LP8864SQRHBRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8864SQRHBRQ1 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 LP8864SQRHBRQ1 meets industry standards.
7.What is the process for return or replacement of LP8864SQRHBRQ1?
All LP8864SQRHBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8864SQRHBRQ1, 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 LP8864SQRHBRQ1 part is unused and in its original packaging.
Return procedure for LP8864SQRHBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8864SQRHBRQ1 Tags
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