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Texas Instruments LP8868XQDMTRQ1
- Part No.:
- LP8868XQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8868XQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8868XQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver supporting boost topology with integrated 5.2A/150mΩ low-side NMOS, 4.5V–65V input range, 100kHz–2.2MHz configurable switching frequency, and inductive fast dimming (IFD) for HUD and instrument cluster backlighting.
For engineers reviewing the LP8868XQDMTRQ1 datasheet, LP8868XQDMTRQ1 pinout, LP8868XQDMTRQ1 application, or LP8868XQDMTRQ1 equivalent, this page delivers verified topology-specific parameters, validated thermal foldback behavior, confirmed 150ns PWM pulse capability, and VSON-14 package mechanical and functional mapping - all critical for automotive lighting BOM validation and EMI-compliant layout design.
Technical Context
The LP8868XQDMTRQ1 implements adaptive off-time current-mode control with smart sampling to enable inductive fast dimming (IFD), achieving high dimming accuracy across 1.17%–100% duty cycles. Its FSET pin sets switching frequency from 100kHz to 2.2MHz via external resistor, and spread spectrum (±7%, 2kHz modulation) is enabled by default to reduce EMI peaks.
It integrates a 5.2A/150mΩ low-side NMOS switch optimized for boost operation, supports analog, PWM, hybrid, and flexible dimming via ADIM/HD and EN/PWM pins, and provides configurable LED open/short, thermal foldback (130°C start), and cycle-by-cycle current limit (6.5A typical) with open-drain FAULT signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost-only configuration per LP8868X-Q1 variant designation in TI comparison table. |
| Input Voltage Range | 4.5V to 63V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Switching Frequency | 100kHz to 2.2MHz - set via FSET pin resistor; spread spectrum enabled for EMI reduction. |
| LED Output Current | Up to 4A in buck topology; LP8868X-Q1 boost variant rated for ≥3A continuous with proper thermal design. |
| PWM Dimming Minimum Pulse | 150ns - enables ultra-high-resolution brightness control for HUD and cluster displays. |
| Thermal Protection | Configurable thermal foldback starting at 130°C (RTEMP = 20kΩ); shutdown at 165°C with 15°C hysteresis. |
| MOSFET RDS(on) | 150mΩ - integrated low-side NMOS optimized for efficiency and thermal performance in boost topology. |
Pinout & Package
VSON-14 package (4.5mm × 3mm), thermally enhanced with exposed power ground pad; designed for single-layer PCB compatibility in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, PGND | Power ground | Primary return path for high-current switching loop; must be connected to thermal pad for optimal thermal dissipation. |
| 2, AGND | Analog ground | Reference for precision current sensing (CSP/CSN) and error amplifier (COMP); requires separate low-noise routing. |
| 3, VIN | Main input supply | Accepts 4.5V–63V; feeds internal LDO and power stage; requires local 10µF ceramic input capacitor. |
| 4, VCC | LDO output | 5.15V ±0.15V regulated supply for internal circuitry; requires 1µF/10V ceramic capacitor to AGND. |
| 5, ADIM/HD | Dimming mode control | Configures analog/hybrid dimming; logic level determines IFD behavior and reference voltage scaling. |
| 6, EN/PWM | Enable & PWM input | Pull high for always-on; apply PWM signal for brightness control; minimum 150ns pulse width supported. |
| 7, FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal fault, or current-limit event; requires external pull-up for system monitoring. |
| 8, TEMP | Thermal foldback programming | Resistor-to-GND sets foldback curve slope and onset temperature (e.g., 20kΩ → 130°C start). |
| 9, FSET | Frequency setting | Resistor-to-GND selects switching frequency (e.g., 59kΩ → 400kHz); spread spectrum active by default. |
| 10, COMP | Error amplifier output | Connects external RC network to set compensation bandwidth and soft-start time; critical for stability in boost. |
| 11, OVP | Overvoltage protection | Resistor divider sets LED string overvoltage threshold; disables output if exceeded to protect LEDs. |
| 12, CSN | Current sense negative | Low-side current sense return; 100Ω series resistor recommended to suppress noise coupling. |
| 13, CSP | Current sense positive | Sense node for LED current feedback; pairs with CSN to generate 200mV reference threshold. |
| 14, SW | Switching node | Internal NMOS drain connection; routes to inductor and Schottky diode in boost configuration. |
| Thermal Pad | Power ground & thermal path | Must be soldered to large copper pour for RθJB = 14.7°C/W; electrically tied to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables accurate current regulation down to 1.17% duty cycle using adaptive off-time control and smart sampling - essential for flicker-free HUD brightness transitions. |
| Configurable Spread Spectrum | ±7% frequency dither at 2kHz reduces peak EMI by >10dB in boost applications, easing compliance with CISPR 25 Class 5 without added filtering. |
| Multi-Topology Flexibility | LP8868X-Q1 variant is factory-configured for boost operation only, eliminating need for external topology selection logic or rework. |
| Integrated Thermal Management | Programmable foldback curve (via TEMP pin) and 165°C shutdown prevent thermal runaway in sealed headlight or cluster enclosures with limited airflow. |
| Robust Fault Detection | Dual-level protection: real-time cycle-by-cycle current limiting (6.5A typ.) plus LED open/short detection via OVP/UVP pins - reduces system-level diagnostic overhead. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: Driving illumination of TFT-LCD or OLED gauges under variable ambient light (0–100,000 lux) and temperature (-40°C to +125°C). IC Role / Device Role / Timing Role: Boost LED driver delivering stable 3A@40V to multi-segment LED strings with 150ns PWM resolution for dynamic contrast control. Use Value: Enables seamless brightness ramping without visible stepping or flicker, meeting UNECE R121 photometric uniformity requirements. |
Use Scenario: High-brightness projection backlight for combiner glass in AR-HUD systems requiring >15,000 cd/m² luminance. IC Role / Device Role / Timing Role: Precision current source with IFD supporting 10,000:1 dimming ratio and <1% current matching across parallel strings. Use Value: Maintains image fidelity during rapid scene changes (e.g., tunnel exit) by eliminating transient current overshoot and settling within 50µs. |
| Automotive Infotainment Displays | Automotive Lighting Control Modules |
Use Scenario: Backlighting for center-stack touchscreens operating in extended temperature environments with EMC-sensitive RF receivers nearby. IC Role / Device Role / Timing Role: EMI-optimized boost driver with spread spectrum and 4.5V–65V input tolerance for direct battery connection. Use Value: Passes CISPR 25 Class 5 conducted emissions without ferrite beads or common-mode chokes, reducing BOM cost and board area. |
Use Scenario: Centralized LED power management in body control modules driving exterior lighting functions (DRL, position lamps). IC Role / Device Role / Timing Role: Programmable current regulator with fault reporting (FAULT pin) and thermal derating for long-life reliability in sealed housings. Use Value: Eliminates need for discrete current-sense amplifiers and microcontroller-based diagnostics, lowering system complexity and ASIL-B compliance effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8868YQDMTRQ1 | Buck-boost topology support; identical VSON-14 package, same 6.5A current limit and spread spectrum. | Required where input voltage may fall below LED forward voltage (e.g., 12V battery with 20V+ LED string). | Select LP8868YQDMTRQ1 when bidirectional voltage regulation is needed; LP8868XQDMTRQ1 is optimized for fixed-boost efficiency. |
| LP8868ZQDMTRQ1 | Buck topology only; same package and pinout but different internal compensation for lower output voltage operation. | Suitable for low-Vf LED arrays (e.g., 3–5 white LEDs) powered from stabilized 5V or 12V rails. | Choose LP8868ZQDMTRQ1 for compact interior lighting; LP8868XQDMTRQ1 remains preferred for high-Vf HUD and cluster strings. |
Compared with LP8868YQDMTRQ1 and LP8868ZQDMTRQ1, the LP8868XQDMTRQ1 delivers highest efficiency in pure boost configurations above 20V output, with optimized gate drive timing and reduced switching losses - making it the most suitable choice for high-luminance automotive display backlights.
Availability
LP8868XQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment backlighting requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LP8868XQDMTRQ1 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 ICs with over 40 years of automotive qualification experience.
The LP8868-Q1 product line is engineered specifically for AEC-Q100 Grade 1 automotive LED lighting, emphasizing high-efficiency multi-topology operation, inductive fast dimming, and robust fault handling in harsh vehicle environments.
FAQ
What topology does the LP8868XQDMTRQ1 support?
The LP8868XQDMTRQ1 is factory-configured for boost topology only, as confirmed in TI's official comparison table. It does not support buck or buck-boost modes - those require LP8868ZQDMTRQ1 or LP8868YQDMTRQ1 variants respectively. This specialization enables optimized gate drive, compensation, and efficiency for high-output-voltage LED strings typical in HUD and cluster applications.
Does the LP8868XQDMTRQ1 include spread spectrum EMI reduction?
Yes, the LP8868XQDMTRQ1 has spread spectrum enabled by default, providing ±7% frequency dither at 2kHz to reduce peak EMI emissions. This feature is explicitly documented for LP8868X/Y/Z-Q1 variants in the datasheet and is active without external configuration - unlike LP8868U/V/W-Q1 variants where it is disabled.
What is the minimum PWM pulse width supported by the LP8868XQDMTRQ1?
The LP8868XQDMTRQ1 supports a minimum PWM pulse width of 150ns, verified in Section 6.5 Electrical Characteristics under "tPWM_OUT_ON" and "tPWM_IN_ON". This enables ultra-fine brightness resolution required for flicker-free operation in high-dynamic-range automotive displays like digital instrument clusters and AR-HUDs.
How is thermal foldback configured on the LP8868XQDMTRQ1?
Thermal foldback on the LP8868XQDMTRQ1 is configured via an external resistor (RTEMP) connected between the TEMP pin and AGND. A 20kΩ resistor sets the foldback onset at 130°C, with programmable slope and hysteresis. The device enters gradual current reduction before reaching 165°C shutdown - critical for maintaining LED lifetime in sealed automotive enclosures.
Is the LP8868XQDMTRQ1 pin-compatible with other LP8868-Q1 variants in VSON-14?
Yes, all LP8868-Q1 VSON-14 variants - including LP8868XQDMTRQ1, LP8868YQDMTRQ1, and LP8868ZQDMTRQ1 - share identical pinout, package dimensions (4.5mm × 3mm), and mechanical footprint. Functional differences (topology, spread spectrum) are implemented internally and do not affect PCB layout or assembly.
LP8868XQDMTRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- 0V ~ 63V
- Current - Output / Channel:
- 4A
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VSON (4.5x3)
LP8868XQDMTRQ1 FAQ
1.How can I place an order for LP8868XQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8868XQDMTRQ1 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 LP8868XQDMTRQ1 reliable?
The price and inventory of LP8868XQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8868XQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8868XQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8868XQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8868XQDMTRQ1?
LP8868XQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8868XQDMTRQ1 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 LP8868XQDMTRQ1?
For technical support, including LP8868XQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8868XQDMTRQ1 requirements.
6.How does Aetrix verify that LP8868XQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8868XQDMTRQ1 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 LP8868XQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8868XQDMTRQ1?
All LP8868XQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8868XQDMTRQ1, 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 LP8868XQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8868XQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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