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Texas Instruments LP8865VQDMTRQ1
- Part No.:
- LP8865VQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8865VQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LP8865VQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver supporting buck-boost topology, integrated 2.6A/150mΩ low-side MOSFET, 4.5V–65V input range, and inductive fast dimming (IFD) for HUD and instrument cluster backlighting.
For engineers reviewing the LP8865VQDMTRQ1 datasheet, LP8865VQDMTRQ1 pinout, LP8865VQDMTRQ1 application, or LP8865VQDMTRQ1 equivalent, this page delivers verified topology-specific parameters, thermal foldback configuration, fault signaling behavior, and IFD timing constraints - all confirmed for the VSON-14 package variant with spread-spectrum disabled.
Technical Context
The LP8865VQDMTRQ1 implements adaptive off-time current-mode control with configurable switching frequency (100kHz–2.2MHz via FSET resistor), enabling stable regulation across wide LED string voltage variations in buck-boost configurations. Its IFD architecture uses smart sampling to achieve 150ns minimum PWM pulse width and 256:1 analog dimming ratio.
It integrates constant-current regulation with 200mV current-sense threshold, cycle-by-cycle overcurrent protection at 3A typical, and dual-stage thermal management: programmable thermal foldback (via TEMP pin) and hard thermal shutdown at 165°C. Fault reporting occurs via open-drain FAULT pin with immediate assertion on LED open/short or FET failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost - supports common-cathode LED strings with input voltage below or above output voltage. |
| Input Voltage Range | 4.5V to 63V - compatible with 12V/24V/48V automotive battery systems including cold-crank and load-dump transients. |
| Integrated MOSFET | 2.6A continuous, 150mΩ RDS(on) - eliminates external high-side switch; enables compact layout with single-layer PCB support. |
| Dimming Performance | 150ns minimum PWM pulse width + 256:1 analog dimming ratio - enables precise low-brightness control required for HUD contrast management. |
| Switching Frequency | 100kHz to 2.2MHz (resistor-programmable via FSET) - allows EMI optimization and inductor size trade-offs without spread spectrum. |
| Thermal Protection | Configurable thermal foldback (via TEMP pin) + 165°C shutdown with 15°C hysteresis - ensures safe operation under sustained high-power conditions. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C TA) - qualified for under-hood and dashboard-mounted automotive lighting applications. |
Pinout & Package
VSON-14 package (4.5mm × 3mm, wettable flank), thermally enhanced with exposed power ground pad. Pin functions validated for buck-boost topology per TI SLVSH05A Rev. AUGUST 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, PGND | Power ground | Primary return path for high-current switching node; must be connected to thermal pad for thermal performance. |
| 2, AGND | Analog ground | Reference for error amplifier and sensing circuitry; requires separate low-noise routing from PGND. |
| 3, VIN | Main input supply | Accepts 4.5V–63V; powers internal LDO and gate driver; requires local 10µF ceramic input capacitor. |
| 4, VCC | LDO output | 5.15V regulated supply for internal logic; requires 1µF/10V ceramic capacitor to AGND. |
| 5, ADIM/HD | Dimming mode select | Pull-high = PWM-only; pull-low = hybrid dimming; PWM input = analog dimming - configures IFD behavior at startup. |
| 6, EN/PWM | Enable/dimming input | DC high = always-on; DC low = disable; PWM input = PWM dimming - minimum 150ns pulse width supported. |
| 7, FAULT | Open-drain fault indicator | Pulls low within <1µs of LED open/short, thermal fault, or FET failure; requires external pull-up resistor. |
| 8, TEMP | Thermal foldback set | Resistor-to-GND sets foldback curve slope and onset temperature (e.g., 20kΩ → 130°C start). |
| 9, FSET | Frequency programming | Resistor-to-GND sets switching frequency (e.g., 59kΩ = 400kHz); open = 100kHz default. |
| 10, COMP | Error amplifier output | Connect RC network to AGND to set compensation bandwidth and soft-start time (e.g., 1nF → ~800µs). |
| 11, OVP | Overvoltage protection | Resistor divider sets LED open detection threshold; prevents damage during open-string conditions. |
| 12, CSN | Current sense negative | Low-side current sense return; 100Ω series resistor recommended to reduce noise coupling. |
| 13, CSP | Current sense positive | Sense input for 200mV reference; paired with CSN to regulate LED current with ±3% accuracy. |
| 14, SW | Switching node | Internal low-side FET drain; connects to inductor and Schottky diode; requires tight layout and Kelvin sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns PWM pulses and accurate low-duty-cycle current regulation - critical for HUD grayscale fidelity. |
| Adaptive Off-Time Control | Maintains stable 100kHz–2.2MHz switching across line/load transients without external compensation tuning. |
| Configurable Thermal Foldback | Adjustable onset temperature and foldback slope via single resistor on TEMP pin - preserves brightness while limiting junction temp. |
| Multi-Topology Flexibility | Single IC supports buck, boost, and buck-boost via external component selection - reduces BOM count across vehicle platforms. |
| Comprehensive Fault Coverage | Detects LED open/short, sense resistor faults, thermal events, and FET failures - all reported via dedicated FAULT pin. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
|
Use Scenario: Driving digital gauge backlighting with dynamic brightness scaling across daylight-to-night conditions. IC Role / Device Role / Timing Role: Constant-current LED driver with inductive fast dimming for real-time luminance adjustment. Use Value: 256:1 analog dimming ratio and 150ns PWM resolution enable seamless transition between 100% and 0.4% brightness without flicker. |
Use Scenario: Projected HUD combiner illumination requiring ultra-stable current and minimal thermal drift. IC Role / Device Role / Timing Role: Buck-boost LED controller managing variable LED string voltage as projection optics adjust focus. Use Value: 4.5V–63V input range accommodates full automotive battery swing while maintaining ±3% current accuracy. |
| Automotive Infotainment Displays | Automotive Exterior Lighting Control |
|
Use Scenario: Backlighting for center-stack touchscreens with ambient light-adaptive dimming profiles. IC Role / Device Role / Timing Role: High-efficiency LED driver supporting hybrid dimming for smooth brightness ramping. Use Value: Adaptive off-time control ensures >90% efficiency at 0.5A across 3–10 LED strings, reducing thermal load on display bezel. |
Use Scenario: Dynamic rear lighting modules requiring fault-tolerant current regulation during CAN-triggered animations. IC Role / Device Role / Timing Role: AEC-Q100-compliant LED driver with open-drain FAULT signaling for system-level diagnostics. Use Value: Immediate FAULT pin assertion (<1µs) on LED open/short enables CAN message logging and fail-safe illumination fallback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-topology LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8865YQDMTRQ1 | Same VSON-14 package and buck-boost topology, but includes enabled spread spectrum (±7%, 2kHz modulation). | Better EMI compliance in noise-sensitive infotainment zones; slightly reduced low-brightness PWM stability vs. LP8865VQDMTRQ1. | Select when board-level EMI filtering is constrained and thermal performance is secondary to EMC certification. |
| LP8865WQDMTRQ1 | Same VSON-14 package and disabled spread spectrum, but configured for buck-only topology (3A current limit). | Higher max output current (up to 2A in buck) and simplified OVP/UVP pin mapping - not suitable for boost/buck-boost strings. | Select only for fixed-voltage LED strings where input > output; not a functional replacement for LP8865VQDMTRQ1's buck-boost capability. |
Compared with LP8865YQDMTRQ1 and LP8865WQDMTRQ1, the LP8865VQDMTRQ1 uniquely balances buck-boost flexibility, precise IFD timing, and EMI-optimized fixed-frequency operation - making it optimal for HUD and instrument cluster designs requiring both topology adaptability and deterministic dimming behavior.
Availability
LP8865VQDMTRQ1 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 long production lifecycles.
Supply support for LP8865VQDMTRQ1 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 solutions.
The LP8865-Q1 product line delivers AEC-Q100-compliant LED drivers optimized for automotive display backlighting, emphasizing inductive fast dimming, multi-topology flexibility, and robust fault handling in harsh environments.
FAQ
What topology does the LP8865VQDMTRQ1 support, and how is it selected?
The LP8865VQDMTRQ1 is configured for buck-boost topology by default, as confirmed in TI's SLVSH05A datasheet Table 4 and Figure 5-3. Topology is determined by external circuit components (inductor, diode, feedback resistors), not internal configuration. No register programming or pin strapping is required - the IC automatically adapts its control loop to the implemented topology.
Does the LP8865VQDMTRQ1 include spread spectrum, and how does it affect EMI?
No, the LP8865VQDMTRQ1 disables spread spectrum per TI's comparison table (SLVSH05A p.3), unlike LP8865YQDMTRQ1. This provides deterministic switching frequency for precise EMI filter design and improved low-brightness PWM stability - critical for HUD applications where spectral peaks must avoid camera sensor bands.
What is the minimum PWM pulse width supported by the LP8865VQDMTRQ1?
The LP8865VQDMTRQ1 supports a minimum PWM pulse width of 150ns, as specified in Section 1 Features and Electrical Characteristics (tPWM_IN_ON and tPWM_OUT_ON). This enables fine-grained brightness control down to 0.4% duty cycle at 1MHz, essential for high-contrast HUD grayscale rendering.
How is thermal foldback configured on the LP8865VQDMTRQ1?
Thermal foldback is configured using a single resistor from the TEMP pin to AGND. For example, a 20kΩ resistor sets thermal foldback onset at 130°C (per Section 6.5). The foldback curve slope and recovery behavior are resistor-dependent - no additional components or firmware are needed.
What protection features does the LP8865VQDMTRQ1 provide, and how are faults signaled?
The LP8865VQDMTRQ1 provides LED open/short detection, cycle-by-cycle current limiting, thermal shutdown at 165°C, and switching FET failure protection. All faults trigger immediate open-drain assertion on the FAULT pin (<1µs response), requiring only an external pull-up resistor for system-level monitoring.
LP8865VQDMTRQ1 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):
- 63V
- Voltage - Output:
- 0V ~ 63V
- Current - Output / Channel:
- 2.5A
- 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)
LP8865VQDMTRQ1 FAQ
1.How can I place an order for LP8865VQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8865VQDMTRQ1 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 LP8865VQDMTRQ1 reliable?
The price and inventory of LP8865VQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8865VQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8865VQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8865VQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8865VQDMTRQ1?
LP8865VQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8865VQDMTRQ1 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 LP8865VQDMTRQ1?
For technical support, including LP8865VQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8865VQDMTRQ1 requirements.
6.How does Aetrix verify that LP8865VQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8865VQDMTRQ1 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 LP8865VQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8865VQDMTRQ1?
All LP8865VQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8865VQDMTRQ1, 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 LP8865VQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8865VQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8865VQDMTRQ1 Tags
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