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Texas Instruments LP8865WQDMTRQ1
- Part No.:
- LP8865WQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8865WQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8865WQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver IC supporting buck topology, integrated 2.6A/150mΩ low-side NMOS switch, 4.5V–65V input range, and inductive fast dimming (IFD) with 150ns PWM pulse width capability. It delivers up to 2A output current for high-brightness instrument cluster backlighting.
For engineers reviewing the LP8865WQDMTRQ1 datasheet, LP8865WQDMTRQ1 pinout, LP8865WQDMTRQ1 application, or LP8865WQDMTRQ1 equivalent, this page provides verified topology-specific electrical parameters, validated VSON-14 pin functions, confirmed thermal foldback configuration, and real-world dimming performance data for automotive lighting design validation.
Technical Context
The LP8865WQDMTRQ1 implements adaptive off-time current-mode control with configurable switching frequency (100kHz–2.2MHz via FSET resistor), enabling stable regulation across wide input voltage and LED string variations. Its error amplifier (COMP pin) supports external RC compensation for bandwidth tuning, and IFD operation relies on precise CSP/CSN current-sense sampling synchronized to PWM edges.
This variant disables spread spectrum (unlike LP8865X/Y/Z-Q1) to minimize brightness ripple at low dimming duty cycles. Thermal protection includes programmable foldback (via TEMP pin resistor) and fixed 165°C shutdown with 15°C hysteresis, while fault reporting uses open-drain FAULT pin with <0.1V low-level output at 3mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck only - fixed internal configuration; no boost/buck-boost support in this variant. |
| Input Voltage Range | 4.5V to 63V - enables direct connection to 12V/24V/48V automotive battery rails with transient tolerance. |
| Max Output Current | 2A - sustained LED drive capability with integrated 150mΩ MOSFET and cycle-by-cycle current limit. |
| PWM Dimming Pulse Width | 150ns minimum - enables high-resolution fast dimming for flicker-free HUD and cluster displays. |
| Switching Frequency Range | 100kHz to 2.2MHz - set by external resistor on FSET pin; higher frequencies reduce inductor size but increase losses. |
| Thermal Shutdown Threshold | 165°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Current Sense Threshold | 200mV ±3mV - sets LED current accuracy; used with external Rsense per ILED = 0.2V / Rsense. |
Pinout & Package
VSON-14 package (4.5mm × 3mm, wettable flank), thermally enhanced with exposed power ground pad. Pin numbering follows top-view layout with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power ground reference | Primary return path for high-current switching node; must connect directly to thermal pad and low-impedance ground plane. |
| 2 AGND | Analog ground reference | Reference for COMP, TEMP, FSET, and sense amplifier; isolated from PGND except at single-point star ground. |
| 3 VIN | Main power input | Accepts 4.5V–63V; requires local 10µF ceramic + bulk capacitor; connects to input ESD and overvoltage protection. |
| 4 VCC | Internal LDO output | 5.15V ±0.15V regulated supply for internal logic; requires 1µF X7R ceramic capacitor to AGND. |
| 5 ADIM/HD | Dimming mode select | Pull low for hybrid dimming, pull high for PWM-only, apply PWM signal for analog dimming - determines IFD behavior. |
| 6 EN/PWM | Enable or PWM input | High = enabled, low = disabled; rising edge >5µs triggers soft-start; also accepts PWM signal for dimming control. |
| 7 FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal fault, or current-limit event; requires external pull-up to VCC or system rail. |
| 8 TEMP | Thermal foldback programming | Resistor-to-ground sets foldback curve start temperature (e.g., 20kΩ → 130°C); enables gradual current reduction before shutdown. |
| 9 FSET | Switching frequency setting | Resistor-to-ground selects frequency (e.g., 59kΩ = 400kHz); no connection defaults to 100kHz. |
| 10 COMP | Error amplifier output | Connect RC network to AGND to set loop bandwidth and soft-start time; critical for stability in buck topology. |
| 11 UVP | LED open detection threshold | Resistor divider sets undervoltage threshold for LED string open-circuit detection; referenced to CSP/CSN. |
| 12 CSP | Current sense positive | High-side connection to sense resistor; routed with matched length to CSN to minimize noise coupling. |
| 13 CSN | Current sense negative | Low-side connection to sense resistor; 100Ω series resistor recommended to damp noise and improve EMI immunity. |
| 14 SW | Switching node | Connects internally to low-side MOSFET drain; ties to inductor and Schottky diode cathode in buck configuration. |
| Pad Thermal Pad | Power ground and thermal path | Mandatory solder connection to large copper pour; primary thermal dissipation path for 2.6A switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns PWM pulses with minimal current overshoot, achieving >10,000:1 effective dimming ratio in instrument clusters. |
| Configurable Thermal Foldback | Adjustable via single resistor on TEMP pin - allows trade-off between peak brightness and thermal reliability without firmware changes. |
| Integrated 2.6A Low-Side MOSFET | 150mΩ RDS(on) at 25°C eliminates external switch, reduces BOM count, and simplifies layout for space-constrained automotive modules. |
| Adaptive Off-Time Control | Maintains stable 100kHz–2.2MHz switching under wide input/output conditions, improving transient response vs fixed-frequency controllers. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +125°C ambient operation - meets automotive junction temperature and lifetime requirements for dashboard applications. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
|
Use Scenario: Driving illumination of TFT-LCD or OLED gauges with dynamic brightness scaling based on ambient light and vehicle speed. IC Role / Device Role / Timing Role: Constant-current LED driver providing precise 0–100% analog+PWM hybrid dimming with <150ns edge fidelity. Use Value: Eliminates visible flicker during rapid brightness transitions and ensures consistent color point across dimming range. |
Use Scenario: Powering high-luminance LED arrays projecting virtual images onto windshield with variable intensity for day/night modes. IC Role / Device Role / Timing Role: Buck topology current regulator delivering 2A at 5–12V with fast PWM dimming synchronized to projection timing. Use Value: Enables seamless brightness ramping without ghosting or latency, critical for safety-critical HUD readability. |
| Automotive Infotainment Displays | Automotive Lighting Control Modules |
|
Use Scenario: Backlighting center-stack touchscreens requiring uniform luminance and low EMI in proximity to RF receivers. IC Role / Device Role / Timing Role: High-efficiency buck LED driver with spread-spectrum disabled to avoid interference with AM/FM/Bluetooth bands. Use Value: Delivers >90% efficiency at 0.5A/8LED while meeting CISPR-25 Class 5 radiated emissions limits. |
Use Scenario: Centralized LED power management for interior map lights, door courtesy lamps, and ambient lighting zones. IC Role / Device Role / Timing Role: Programmable current source supporting multiple independent strings via external FETs or multiplexing. Use Value: Reduces system-level component count by integrating current regulation, fault monitoring, and thermal management in one Q1-qualified IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8865ZQDMTRQ1 | Same buck topology and pinout, but enables spread spectrum for lower EMI - increases brightness ripple at low dimming levels. | Better suited for infotainment displays where EMI dominates over flicker sensitivity. | Select LP8865ZQDMTRQ1 when radiated emissions compliance is prioritized over ultra-low-brightness stability. |
| TPS92692QPWPRQ1 | Higher 3.5A current capability, supports buck/boost/SEPIC, but lacks integrated MOSFET - requires external switch and gate driver. | Used in high-power headlamp DRL modules where >2A output and topology flexibility are required. | Choose TPS92692QPWPRQ1 only when output current exceeds 2A or multi-topology operation is mandatory. |
Compared with LP8865ZQDMTRQ1 and TPS92692QPWPRQ1, the LP8865WQDMTRQ1 offers optimal balance of integration, flicker-free dimming, and AEC-Q100 reliability for mid-power instrument cluster and HUD applications - without EMI compromises or external FET complexity.
Availability
LP8865WQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment backlighting requiring stable component supply, long-term automotive qualification, and production-ready thermal performance.
Supply support for LP8865WQDMTRQ1 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 with over 40 years of automotive qualification experience.
The LP8865-Q1 product line targets high-reliability automotive LED lighting systems, emphasizing inductive fast dimming, thermal resilience, and AEC-Q100-compliant integration for next-generation digital cockpits.
FAQ
What topology does the LP8865WQDMTRQ1 support?
The LP8865WQDMTRQ1 is configured exclusively for buck topology. Unlike other members of the LP8865-Q1 family (e.g., LP8865X/Y/Z-Q1), it does not support boost or buck-boost operation. Its internal circuitry, pin functions (UVP instead of OVP), and datasheet specifications confirm fixed buck-only functionality - verified in Table 4 and Figure 5-1 of the official TI datasheet SLVSH05A.
Does the LP8865WQDMTRQ1 include spread spectrum modulation?
No, the LP8865WQDMTRQ1 disables spread spectrum to optimize brightness stability at low dimming levels. Section 7.3.1.2 explicitly states that LP8865U/V/W-Q1 variants disable this feature "toward better brightness performance in low brightness scenario," while LP8865X/Y/Z-Q1 enable it. This trade-off reduces EMI filtering requirements but prioritizes flicker-free operation in instrument clusters.
What is the maximum continuous output current of the LP8865WQDMTRQ1?
The LP8865WQDMTRQ1 delivers up to 2A continuous LED output current in buck topology, enabled by its integrated 2.6A/150mΩ low-side NMOS switch and cycle-by-cycle current limit set to 3A typical. This rating is confirmed in the "Features" section and Table 6-5 (ILIM parameter), and applies under proper thermal management using the exposed thermal pad per JEDEC JESD51-7 guidelines.
How is thermal foldback configured on the LP8865WQDMTRQ1?
Thermal foldback on the LP8865WQDMTRQ1 is configured using a single resistor between the TEMP pin and AGND. A 20kΩ resistor sets the foldback start temperature to 130°C, as specified in Table 6-5. The foldback curve reduces LED current gradually above this threshold - distinct from hard thermal shutdown at 165°C - allowing continued operation at reduced brightness during transient overheating events.
What package type and dimensions does the LP8865WQDMTRQ1 use?
The LP8865WQDMTRQ1 uses the VSON-14 package with dimensions 4.5mm × 3mm × 0.9mm (nominal), featuring wettable flanks and an exposed thermal pad. This is confirmed in the "Package Information" section and Figure 5-1 of the datasheet. It is not offered in HVSSOP; the HVSSOP variants (e.g., LP8865WQDRQ1) are separate orderables with different pin count and layout.
LP8865WQDMTRQ1 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):
- 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)
LP8865WQDMTRQ1 FAQ
1.How can I place an order for LP8865WQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8865WQDMTRQ1 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 LP8865WQDMTRQ1 reliable?
The price and inventory of LP8865WQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8865WQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8865WQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8865WQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8865WQDMTRQ1?
LP8865WQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8865WQDMTRQ1 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 LP8865WQDMTRQ1?
For technical support, including LP8865WQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8865WQDMTRQ1 requirements.
6.How does Aetrix verify that LP8865WQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8865WQDMTRQ1 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 LP8865WQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8865WQDMTRQ1?
All LP8865WQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8865WQDMTRQ1, 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 LP8865WQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8865WQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8865WQDMTRQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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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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