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Texas Instruments LP8868WQDMTRQ1
- Part No.:
- LP8868WQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8868WQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LP8868WQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver supporting buck topology with integrated 5.2A/150mΩ low-side MOSFET, 4.5V–65V input range, 100kHz–2.2MHz configurable switching frequency, and inductive fast dimming (IFD) for high-accuracy LED current control in instrument clusters and HUDs.
For engineers reviewing the LP8868WQDMTRQ1 datasheet, LP8868WQDMTRQ1 pinout, LP8868WQDMTRQ1 application, or LP8868WQDMTRQ1 equivalent, this page delivers verified topology-specific parameters, validated thermal foldback behavior, confirmed 14-pin VSON package mapping, and real-world dimming performance data for automotive lighting design validation.
Technical Context
The LP8868WQDMTRQ1 implements adaptive off-time current-mode control with smart sampling to enable inductive fast dimming (IFD), achieving 150ns minimum PWM pulse width and 256:1 analog dimming ratio. Its error amplifier output (COMP) interfaces with external RC networks to tune loop bandwidth and soft-start timing.
It uses dedicated CSP/CSN differential current sense inputs referenced to a 200mV internal threshold, supports configurable thermal foldback via TEMP pin resistor dividers, and disables spread spectrum-unlike X/Y/Z variants-to prioritize brightness stability at low duty cycles in critical display applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck only - fixed internal configuration; not reconfigurable to boost or buck-boost. |
| Max Output Current | 4A - achievable in buck topology with proper heatsinking and layout per RθJB = 14.7°C/W. |
| Input Voltage Range | 4.5V to 63V - supports 12V/24V/48V automotive battery rails including cold-crank and load-dump transients. |
| Switching Frequency | 100kHz to 2.2MHz - set by external resistor on FSET pin; no spread spectrum enabled (confirmed variant-specific). |
| MOSFET RDS(on) | 150mΩ - measured at TJ = 25°C; increases to ~225mΩ at 125°C per Figure 6-4. |
| Dimming Accuracy | ±1.17% current sense threshold deviation at 1.17% ADIM duty cycle - enables precise low-brightness control for HUDs. |
| Thermal Shutdown | 165°C with 15°C hysteresis - protects against sustained overtemperature in enclosed head-unit enclosures. |
Pinout & Package
LP8868WQDMTRQ1 is housed in a thermally enhanced 14-pin VSON package (4.5mm × 3mm), with exposed thermal pad tied to PGND. Pin functions are topology-specific; this variant uses buck-optimized pin mapping per Table 5-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, PGND | Power ground | Main return path for high-current switch node; must be low-inductance connection to thermal pad. |
| 2, AGND | Analog ground | Reference for CSP/CSN sensing and COMP feedback; separate trace routing required from PGND. |
| 3, VIN | Input supply | Accepts 4.5V–63V; requires local 10µF ceramic + bulk capacitor for transient suppression. |
| 4, VCC | LDO output | 5.15V internal LDO; requires 1µF/10V ceramic cap to AGND for stable bias and soft-start timing. |
| 5, ADIM/HD | Dimming mode select | Pull low for hybrid dimming; pull high for PWM-only; accepts PWM signal for analog dimming. |
| 6, EN/PWM | Enable/dimming input | Pull high for always-on; pull low to disable; accepts PWM signal for direct PWM dimming control. |
| 7, FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal shutdown, or current-limit fault; requires 4.7kΩ pull-up. |
| 8, TEMP | Thermal foldback control | Resistor-to-GND sets foldback curve onset (e.g., 20kΩ → 130°C start); no external sensor needed. |
| 9, FSET | Frequency programming | Resistor-to-AGND selects switching frequency (e.g., 59kΩ → 400kHz); open = 100kHz default. |
| 10, COMP | Error amplifier output | Connect RC network to AGND to set compensation pole/zero; determines stability and response speed. |
| 11, UVP | LED open detection | Resistor divider sets undervoltage threshold for LED string open-circuit detection. |
| 12, CSP | Current sense positive | High-side connection to sense resistor; 200mV reference enables accurate ILED regulation. |
| 13, CSN | Current sense negative | Low-side connection to sense resistor; 100Ω series resistor recommended for noise immunity. |
| 14, SW | Switching node | Internally connected to low-side MOSFET drain; connects to inductor and Schottky diode cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns minimum PWM pulse width and <1.2% current sense error at 1.17% duty cycle for HUD black-level fidelity. |
| Configurable Thermal Foldback | Adjustable onset temperature (130°C typical) via single resistor on TEMP pin-no firmware or external IC required. |
| Adaptive Off-Time Control | Maintains stable 100kHz–2.2MHz switching across line/load/temperature without external clock sync. |
| Dual Ground Separation | Independent PGND and AGND pins prevent switching noise from corrupting current-sense accuracy. |
| Integrated Protection Suite | Hardware-level LED open/short, cycle-by-cycle current limit, thermal shutdown, and FET failure detection. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
|
Use Scenario: Driving high-brightness, multi-segment LED backlight arrays behind TFT LCDs in digital dashboards. IC Role / Device Role / Timing Role: Constant-current buck LED driver with IFD enabling flicker-free dimming during vehicle speed or warning icon transitions. Use Value: Delivers 4A output with ±1.17% current accuracy at low duty cycles, ensuring consistent segment luminance across -40°C to +125°C ambient. |
Use Scenario: Powering high-luminance projection LEDs in compact optical combiner systems requiring precise grayscale control. IC Role / Device Role / Timing Role: Buck topology LED controller with 150ns PWM resolution and adaptive off-time regulation for sub-millisecond brightness updates. Use Value: Enables HUDs to maintain >90% optical contrast ratio during rapid night/day mode switching without visible stepping artifacts. |
| Automotive Infotainment Displays | Automotive Exterior Lighting (DRL) |
|
Use Scenario: Backlighting center-stack touchscreens with dynamic local dimming zones in infotainment head units. IC Role / Device Role / Timing Role: High-efficiency buck LED driver supporting hybrid dimming to balance EMI reduction and grayscale linearity. Use Value: Achieves >85% efficiency at 3A/12V input (Figure 6-10), reducing thermal load in space-constrained center-console modules. |
Use Scenario: Driving daytime running light (DRL) strings with strict photometric uniformity and thermal derating requirements. IC Role / Device Role / Timing Role: Automotive-grade constant-current source with configurable thermal foldback to sustain 4A output under hood temperatures up to 125°C. Use Value: Maintains DRL compliance across full AEC-Q100 Grade 1 range using on-chip TEMP pin resistor programming-no external thermal sensor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8868ZQDMTRQ1 | Same buck topology, but includes spread spectrum EMI reduction; 6A current limit vs 5.2A. | Better EMI compliance in crowded RF environments; slightly lower dimming precision at ultra-low brightness. | Select when EMC certification is prioritized over absolute low-duty-cycle grayscale fidelity. |
| LP8864SQEVM | Evaluation module for LP8864-Q1 - 4-channel, 150mA/channel, no integrated MOSFET, requires external FETs. | Supports multi-zone independent dimming; lacks single-string 4A capability and IFD performance. | Choose for distributed LED architectures needing channel-level control, not high-current single-string driving. |
Compared with LP8868ZQDMTRQ1 and LP8864SQEVM, the LP8868WQDMTRQ1 offers superior inductive fast dimming resolution and thermal foldback configurability for single-string, high-brightness automotive displays-without spread spectrum trade-offs or external FET complexity.
Availability
LP8868WQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment backlighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8868WQDMTRQ1 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 deep expertise in automotive-grade power management and lighting solutions.
The LP8868-Q1 product line was engineered specifically for AEC-Q100 Grade 1 automotive LED lighting applications-delivering high-current density, multi-topology flexibility, and inductive fast dimming for next-generation digital cockpits and HUD systems.
FAQ
What topology does LP8868WQDMTRQ1 support?
LP8868WQDMTRQ1 supports buck topology only. Unlike other members of the LP8868-Q1 family (e.g., LP8868XQDMTRQ1 for boost), this variant is factory-configured for buck operation and cannot be reconfigured to boost or buck-boost. Its pinout, protection thresholds, and internal control logic are optimized exclusively for step-down LED driving.
Does LP8868WQDMTRQ1 include spread spectrum modulation?
No, LP8868WQDMTRQ1 disables spread spectrum modulation-this is a deliberate variant-specific feature confirmed in the comparison table and Section 7.3.1.2. It prioritizes brightness stability and dimming precision at low duty cycles over EMI reduction, making it ideal for HUD and instrument cluster applications where visual artifacts must be minimized.
What is the maximum continuous output current for LP8868WQDMTRQ1?
LP8868WQDMTRQ1 supports up to 4A continuous LED output current in buck topology under recommended operating conditions (TA ≤ 125°C, proper PCB thermal design). Its cycle-by-cycle current limit is rated at 5.2A (typical), and thermal foldback begins at 130°C junction temperature to sustain safe operation without abrupt shutdown.
How is thermal foldback configured on LP8868WQDMTRQ1?
Thermal foldback on LP8868WQDMTRQ1 is configured via a single resistor connected between the TEMP pin and AGND. For example, a 20kΩ resistor sets the foldback onset at 130°C (typical), as specified in Section 6.5. This hardware-based method eliminates need for external sensors or firmware intervention, simplifying system-level thermal management.
What package type and dimensions does LP8868WQDMTRQ1 use?
LP8868WQDMTRQ1 uses a 14-pin VSON package measuring 4.5mm × 3mm with an exposed thermal pad. This package is distinct from the 12-pin HVSSOP option used by other variants (e.g., LP8868WQDGNRQ1) and provides lower thermal resistance (RθJB = 14.7°C/W) for high-power automotive applications.
LP8868WQDMTRQ1 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)
- 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)
LP8868WQDMTRQ1 FAQ
1.How can I place an order for LP8868WQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8868WQDMTRQ1 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 LP8868WQDMTRQ1 reliable?
The price and inventory of LP8868WQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8868WQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8868WQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8868WQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8868WQDMTRQ1?
LP8868WQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8868WQDMTRQ1 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 LP8868WQDMTRQ1?
For technical support, including LP8868WQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8868WQDMTRQ1 requirements.
6.How does Aetrix verify that LP8868WQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8868WQDMTRQ1 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 LP8868WQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8868WQDMTRQ1?
All LP8868WQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8868WQDMTRQ1, 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 LP8868WQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8868WQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8868WQDMTRQ1 Tags
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