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Texas Instruments LP8864SQDCPRQ1
- Part No.:
- LP8864SQDCPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 38-PowerTFSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8864SQDCPRQ1.pdf
- Description:
- IC LED DRVR CTRLR PWM 38HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,855
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Product details
Overview
LP8864SQDCPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED backlight driver IC with four 150mA high-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 LP8864SQDCPRQ1 datasheet, LP8864SQDCPRQ1 pinout, LP8864SQDCPRQ1 application, or LP8864SQDCPRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade fault diagnostics, and real-world design implications of its hybrid PWM/analog dimming, auto-phase-shift architecture, and boost spread-spectrum EMI reduction.
Technical Context
The LP8864SQDCPRQ1 integrates a synchronous boost/SEPIC controller with adaptive headroom-based output voltage regulation-continuously monitoring all four LED sink voltages to dynamically minimize VOUT and reduce power loss. Its dual-dimming engine supports simultaneous 16-bit I²C-controlled PWM and 12-bit analog current adjustment, enabling flicker-free, low-EMI brightness control.
Phase-shifted PWM dimming is automatically configured per active channel count (e.g., 90° shift for 4 strings), while extensive fault coverage includes open/short LED detection, VIN OVP/UVP/OCP, boost OVP/OCP, thermal shutdown (165°C trip), and resistor-out-of-range validation on ISET, LED_SET, PWM_FSET, and BST_FSET pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 48V - supports direct connection to automotive battery rail including cold-crank (6V) and load-dump (42V) transients. |
| LED Sink Current | Up to 150mA per channel (200mA max) - enables driving high-brightness LED strings without external amplification. |
| Current Matching | 1% typical - ensures uniform luminance across multiple display zones without software calibration. |
| Dimming Ratio | 32,000:1 at 152Hz - achieves deep black levels in HUDs and infotainment displays under ambient light. |
| Boost Switching Freq | 100kHz to 2.2MHz - avoids AM radio band (530–1710kHz) and allows compact magnetics selection. |
| Ambient Temp Range | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard mounting. |
| Fault Diagnostics | Open/short LED, VIN OVP/UVP/OCP, boost OVP/OCP, thermal shutdown, resistor out-of-range - reduces need for external monitoring circuitry. |
Pinout & Package
LP8864SQDCPRQ1 is packaged in HTSSOP-38 (9.70mm × 4.40mm) with exposed thermal pad (DAP) connected to LED_GND. Pin functions are validated per TI SNVSBD3B Rev. May 2024 datasheet Figures 4-1 and Table 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Bias source for internal analog/digital blocks; requires 10µF decoupling to GND. |
| EN | Enable control | Active-high logic input (1.2V threshold); resets fault status on falling edge. |
| OUT1–OUT4 | LED current sink outputs | Four independent 150mA sinks; unused outputs must be tied to GND to disable. |
| ISET | Full-scale current programming | Resistor sets max LED current (30–200mA); accuracy ±4%, matching ±1%. |
| PWM | Brightness control input | Direct PWM dimming interface; supports 100Hz–20kHz input with 10–16-bit resolution. |
| INT | Fault interrupt output | Open-drain signal indicating any fault condition; cleared via I²C or EN toggle. |
| SCL/SDA | I²C interface | Standard 400kHz I²C bus for register access, dimming control, and fault readback. |
| BST_SYNC | Boost clock sync input | 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; adaptive control lowers VOUT to minimum required headroom. |
| DISCHARGE | Boost output discharge | Actively discharges VOUT when boost is disabled-prevents residual LED glow and improves safety. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase-shift PWM dimming | Eliminates beat frequencies between channels-reduces EMI and visual artifacts in multi-string displays. |
| Hybrid PWM + 12-bit analog dimming | Enables smooth low-frequency dimming without color shift or audible noise from inductor saturation. |
| Adaptive boost output voltage | Reduces power loss by 5–10% vs fixed-VOUT designs-critical for thermal management in sealed enclosures. |
| Integrated charge pump (CPUMP) | Generates 5V gate drive for external N-FETs-enables high-side switch control without auxiliary supply. |
| Comprehensive fault reporting | Single INT pin signals 12+ fault types-including LED short-to-ground, ISET resistor open, and VIN overcurrent-simplifying system-level diagnostics. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
|
Use Scenario: High-contrast, wide-temperature TFT-LCD backlight requiring uniform brightness across speedometer, tachometer, and warning icons. IC Role / Device Role / Timing Role: Four-channel LED driver with auto-phase-shift PWM and adaptive boost voltage control ensures stable luminance during rapid ambient light changes and battery voltage fluctuations. Use Value: 1% current matching eliminates visible banding; 32,000:1 dimming enables night-mode readability without compromising daytime legibility. |
Use Scenario: Compact projection-based HUD with tight thermal envelope and strict EMI limits near RF receivers. IC Role / Device Role / Timing Role: Integrated boost controller with spread-spectrum switching and hybrid dimming reduces conducted/radiated emissions below CISPR 25 Class 5 limits. Use Value: 100kHz–2.2MHz adjustable frequency avoids AM band interference; CPUMP enables efficient high-side FET control for fast enable/disable sequencing. |
| Automotive Infotainment Displays | Smart Mirrors |
|
Use Scenario: 10.25″+ touchscreen display with local dimming zones and dynamic contrast enhancement. IC Role / Device Role / Timing Role: I²C-programmable 16-bit dimming resolution and per-channel enable/disable support zone-specific brightness mapping. Use Value: Enables true local dimming with minimal MCU overhead; built-in fault detection prevents single-string failure from disabling entire backlight. |
Use Scenario: Electrochromic or OLED-based rearview mirror with auto-dimming and glare suppression. IC Role / Device Role / Timing Role: Low-noise analog dimming combined with fast PWM response (<200ns min pulse) supports real-time glare adaptation algorithms. Use Value: 12-bit analog control eliminates PWM-induced flicker at low brightness; DISCHARGE pin ensures zero residual current during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8866Q1 | 6-channel version with identical architecture, same pinout family, but larger QFN-48 package; supports up to 200mA/channel. | Required for >4-string configurations or higher current per string (e.g., large center displays). | Select LP8866Q1 only when additional channels or >150mA per string are needed-no PCB change if migrating within TI's LP886x-Q1 family layout guidelines. |
| MAX20057ATP/V+T | 4-channel 120mA automotive LED driver with integrated MOSFETs; no external boost controller; fixed 2.2MHz switching. | Used in space-constrained modules where external inductor/capacitor area is limited-but lacks adaptive VOUT and phase-shift capability. | Choose MAX20057ATP/V+T for simplified BOM and smaller footprint; accept trade-offs in efficiency (no adaptive VOUT) and dimming flexibility (no hybrid mode). |
Compared with LP8864SQDCPRQ1, LP8866Q1 extends channel count and current capacity while maintaining compatibility in control architecture and diagnostics, whereas MAX20057ATP/V+T trades integration depth for layout simplicity-making it suitable only for lower-power, fixed-frequency applications without adaptive headroom needs.
Availability
LP8864SQDCPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LP8864SQDCPRQ1 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 electronics, with decades of experience in high-reliability power management solutions.
The LP8864SQDCPRQ1 belongs to TI's automotive LED driver product line, designed specifically for AEC-Q100-compliant display backlighting in safety-critical vehicle domains including digital clusters and HUDs.
FAQ
What is the maximum LED string current supported by the LP8864SQDCPRQ1?
The LP8864SQDCPRQ1 supports up to 150mA per channel (OUT1–OUT4) under standard operating conditions, with a maximum rated output of 200mA per sink. The actual current is set by an external resistor on the ISET pin, covering a range of 30mA to 200mA. At 150mA, current matching remains within ±1% typical-ensuring consistent luminance across all channels in the LP8864SQDCPRQ1.
Does the LP8864SQDCPRQ1 support both I²C and PWM dimming simultaneously?
No-the LP8864SQDCPRQ1 supports either I²C-controlled dimming or direct PWM input, selected via the MODE pin configuration. When using PWM input, the I²C interface remains available for fault readback and configuration, but brightness is governed solely by the PWM duty cycle. The LP8864SQDCPRQ1 does not blend both methods in real time; however, its hybrid dimming capability refers to combining 16-bit PWM with 12-bit analog current adjustment-not concurrent I²C/PWM control.
How does the adaptive boost voltage feature improve efficiency in the LP8864SQDCPRQ1?
The LP8864SQDCPRQ1 continuously monitors the headroom voltage across all active LED current sinks and dynamically adjusts the boost output voltage to the lowest level sufficient to maintain regulation. This reduces power dissipation in the LED drivers and boost stage-typically improving system efficiency by 5–10% compared to fixed-output boost controllers-especially at partial brightness or varying LED forward voltage due to temperature. This behavior is intrinsic to the LP8864SQDCPRQ1's architecture and requires no host intervention.
What fault conditions does the INT pin report for the LP8864SQDCPRQ1?
The INT pin on the LP8864SQDCPRQ1 is an open-drain output that asserts low for any of 12+ detected faults, including open/short LED strings, LED short-to-ground, ISET/BST_FSET/PWM_FSET/LED_SET/MODE resistor out-of-range, boost overvoltage/overcurrent, VIN overvoltage/undervoltage/overcurrent, and thermal shutdown. Fault status is latched until cleared via I²C register write or falling edge on the EN pin-providing deterministic system-level error handling in the LP8864SQDCPRQ1.
Can the LP8864SQDCPRQ1 drive more than four LED strings?
The LP8864SQDCPRQ1 has four dedicated current sink outputs (OUT1–OUT4), but supports up to eight LED strings through configurable parallel operation-enabled by the LED_SET pin resistor. For example, setting LED_SET for "8-string" mode internally pairs OUT1/OUT2 and OUT3/OUT4, allowing two independent 300mA channels. This configuration maintains 1% current matching between paired outputs but does not increase total channel count beyond four physical sinks in the LP8864SQDCPRQ1.
LP8864SQDCPRQ1 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:
- 150mA
- 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
LP8864SQDCPRQ1 FAQ
1.How can I place an order for LP8864SQDCPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8864SQDCPRQ1 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 LP8864SQDCPRQ1 reliable?
The price and inventory of LP8864SQDCPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8864SQDCPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8864SQDCPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8864SQDCPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8864SQDCPRQ1?
LP8864SQDCPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8864SQDCPRQ1 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 LP8864SQDCPRQ1?
For technical support, including LP8864SQDCPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8864SQDCPRQ1 requirements.
6.How does Aetrix verify that LP8864SQDCPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8864SQDCPRQ1 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 LP8864SQDCPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8864SQDCPRQ1?
All LP8864SQDCPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8864SQDCPRQ1, 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 LP8864SQDCPRQ1 part is unused and in its original packaging.
Return procedure for LP8864SQDCPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8864SQDCPRQ1 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
Infineon Technologies
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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
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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