My Inquiry
My Account
Texas Instruments LP8865YQDMTRQ1
- Part No.:
- LP8865YQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8865YQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,881
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP8865YQDMTRQ1 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 LP8865YQDMTRQ1 datasheet, LP8865YQDMTRQ1 pinout, LP8865YQDMTRQ1 application, or LP8865YQDMTRQ1 equivalent, this page delivers verified topology-specific parameters, validated thermal foldback behavior, confirmed 150ns PWM pulse capability, and VSON-14 package implementation details.
Technical Context
The LP8865YQDMTRQ1 implements adaptive off-time current-mode control with configurable switching frequency (100kHz–2.2MHz) and enabled spread spectrum (±7%, 2kHz modulation) to reduce EMI in buck-boost configurations. It uses smart sampling to achieve inductive fast dimming with 150ns minimum PWM pulse width and supports hybrid dimming via ADIM/HD and EN/PWM pin logic sequencing.
Its fault detection architecture includes LED open/short, sense resistor fault, cycle-by-cycle current limiting (3A typical), and configurable thermal foldback (via TEMP pin resistor). The internal LDO supplies 5.15V at up to 47mA to power external circuitry while maintaining stable operation across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost - enables flexible LED string voltage matching above or below input rail without topology change. |
| Input Voltage Range | 4.5V to 65V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Integrated MOSFET | 2.6A continuous, 150mΩ RDS(on) - eliminates external switch, reduces BOM count, and enables compact 2-layer PCB layout. |
| Dimming Capability | 150ns minimum PWM pulse width - ensures precise low-brightness control for HUD contrast and instrument cluster readability. |
| Switching Frequency | 100kHz to 2.2MHz, set by FSET pin resistor - allows EMI optimization and inductor size trade-off without changing IC. |
| Thermal Protection | Configurable thermal foldback (via TEMP pin) and 165°C shutdown - prevents thermal runaway during sustained high-power operation. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C TA) - qualified for under-hood and dashboard-mounted automotive lighting systems. |
Pinout & Package
VSON-14 package (4.5mm × 3mm, wettable flank), thermally enhanced with exposed power ground pad. Pin functions are topology-specific; buck-boost configuration uses OVP pin (Pin 11) for overvoltage protection and excludes UVP.
| 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 optimal thermal performance. |
| 2, AGND | Analog ground | Reference for error amplifier and dimming logic; requires separate low-noise routing from PGND to avoid coupling. |
| 3, VIN | Main input supply | Accepts 4.5V–65V automotive input; decoupled with CVIN capacitor near pin for transient immunity. |
| 4, VCC | LDO output | 5.15V regulated supply for internal circuitry and external bias; requires 1μF ceramic capacitor to GND. |
| 5, ADIM/HD | Dimming mode select | Pull-high for PWM-only, pull-low for hybrid dimming; accepts analog PWM signal for 256:1 analog dimming ratio. |
| 6, EN/PWM | Enable/dimming input | High = always-on, low = disable; PWM input enables 150ns-fast PWM dimming with no external controller. |
| 7, FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal fault, or current limit violation; requires external pull-up for system-level fault handling. |
| 8, TEMP | Thermal foldback control | Resistor-to-GND sets foldback curve start temperature (e.g., 20kΩ → 130°C); enables graceful derating before shutdown. |
| 9, FSET | Frequency programming | Resistor-to-GND selects switching frequency (e.g., 59kΩ = 400kHz); enables EMI filtering optimization. |
| 10, COMP | Error amplifier output | Connects to RC network for loop compensation; capacitor value determines soft-start time and bandwidth stability. |
| 11, OVP | Overvoltage protection | Resistor divider sets LED string overvoltage threshold; critical for open-circuit detection in buck-boost topology. |
| 12, CSN | Current sense negative | Low-side current sensing node; 100Ω series resistor recommended to suppress noise coupling into CSP/CSN path. |
| 13, CSP | Current sense positive | Sense input referenced to CSN; 200mV internal reference enables accurate LED current regulation (e.g., 100mΩ → 2A). |
| 14, SW | Switching node | Internal low-side MOSFET drain; connects to inductor and Schottky diode; requires tight layout to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns PWM pulses with minimal current overshoot, preserving LED lifetime and enabling high-contrast HUD display at low brightness. |
| Spread Spectrum Modulation | ±7% frequency dither at 2kHz reduces peak EMI emissions by >10dB, easing compliance with CISPR 25 Class 5 in automotive modules. |
| Configurable Thermal Foldback | Adjustable via single resistor on TEMP pin - allows system-level thermal management without firmware changes or hardware revision. |
| Multi-Topology Flexibility | Single IC supports buck, boost, and buck-boost via external component selection - reduces design reuse effort across instrument cluster, HUD, and infotainment backlight variants. |
| Integrated Fault Reporting | Dedicated open-drain FAULT pin signals LED open/short, thermal events, and current-limit violations - simplifies diagnostic logging and failsafe response in ASIL-B systems. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: Driving in low-light conditions requiring high-contrast, glare-free digital speedometer and warning indicators. IC Role / Device Role / Timing Role: Buck-boost LED driver delivering stable 2A current to multi-segment RGB LED backlight with 256:1 analog dimming resolution. Use Value: Maintains consistent luminance across –40°C to +125°C ambient while enabling rapid brightness transitions for dynamic warning alerts. |
Use Scenario: Projection-based HUD overlaying navigation and ADAS data onto windshield with variable ambient light adaptation. IC Role / Device Role / Timing Role: High-speed PWM-controlled LED driver providing 150ns pulse width dimming for real-time contrast adjustment without flicker. Use Value: Enables seamless brightness scaling from daylight to nighttime without perceptible steps, critical for driver attention retention. |
| Automotive Infotainment Displays | Automotive Exterior Lighting Control |
Use Scenario: Central touchscreen backlighting in center console with touch-responsive dimming and ambient light compensation. IC Role / Device Role / Timing Role: Flexible dimming controller supporting hybrid (analog+PWM) mode for smooth transition between UI states and media playback. Use Value: Eliminates visible stepping during brightness ramping, improving perceived UI quality and reducing eye fatigue during prolonged use. |
Use Scenario: Adaptive front lighting system (AFS) module requiring precise current regulation for matrix LED pixel control. IC Role / Device Role / Timing Role: Constant-current LED driver with cycle-by-cycle current limiting (3A typical) and LED open/short fault detection. Use Value: Ensures functional safety compliance by detecting individual LED failures within <10ms and signaling via FAULT pin for ASIL-B diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8865XQDMTRQ1 | Boost-only topology; identical VSON-14 package, same 3A current limit and spread spectrum, but lacks buck-boost flexibility. | Restricted to LED strings with VLED > VIN; unsuitable for instrument clusters where input may exceed string voltage. | Select when fixed boost topology suffices and cost-sensitive designs prioritize simplified bill-of-materials. |
| LP8865ZQDMTRQ1 | Buck-only topology; same package and current rating, but no OVP pin or boost/buck-boost support - uses UVP instead. | Only viable for LED strings with VLED < VIN; cannot handle variable input-to-string voltage relationships in HUD systems. | Choose for dedicated low-voltage LED arrays where topology is fixed and thermal foldback is not required. |
Compared with LP8865XQDMTRQ1 and LP8865ZQDMTRQ1, the LP8865YQDMTRQ1 uniquely supports buck-boost operation in a single footprint, enabling one hardware design to serve multiple vehicle platforms with varying LED string configurations - reducing validation effort and inventory complexity.
Availability
LP8865YQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays (HUD), and infotainment backlighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8865YQDMTRQ1 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 decades of AEC-Q100 qualification expertise.
The LP8865-Q1 product line was engineered specifically for high-reliability automotive LED lighting, emphasizing topology flexibility, fast dimming fidelity, and robust fault coverage for ASIL-B–compatible systems.
FAQ
What topology does the LP8865YQDMTRQ1 support, and how is it configured?
The LP8865YQDMTRQ1 supports buck-boost topology exclusively, as confirmed by its device variant designation and pinout (OVP pin present, UVP absent). Configuration is achieved through external passive components - inductor, diode, and sense resistor placement - with no register programming required. This topology allows the LP8865YQDMTRQ1 to regulate LED current whether the string voltage is above or below the input rail, making it ideal for HUD and instrument cluster applications with variable LED counts.
Does the LP8865YQDMTRQ1 include spread spectrum modulation, and how is it enabled?
Yes, the LP8865YQDMTRQ1 includes spread spectrum modulation (±7% frequency dither at 2kHz) to reduce EMI peaks, and it is factory-enabled - no external configuration is needed. This feature is intrinsic to the Y/Q1 variant per TI's comparison table and directly lowers conducted and radiated emissions, easing CISPR 25 Class 5 compliance in automotive modules without adding external filtering components.
What is the minimum PWM pulse width supported by the LP8865YQDMTRQ1, and why does it matter?
The LP8865YQDMTRQ1 supports a minimum PWM pulse width of 150ns, verified in Section 6.5 of the datasheet under "tPWM_OUT_ON" and "tPWM_IN_ON". This specification enables precise low-duty-cycle dimming essential for high-contrast HUDs and instrument clusters, where sub-0.1% brightness levels must be rendered without flicker or current instability - a key differentiator versus standard LED drivers with microsecond-scale minimum pulses.
How is thermal foldback configured on the LP8865YQDMTRQ1, and what is its purpose?
Thermal foldback on the LP8865YQDMTRQ1 is configured using a single resistor connected between the TEMP pin and AGND. A 20kΩ resistor sets the foldback start temperature at 130°C, as specified in Section 6.5. Its purpose is to gradually reduce LED current before reaching thermal shutdown (165°C), preventing abrupt system failure and enabling graceful derating - critical for automotive modules operating in confined, high-ambient-temperature environments like dashboard assemblies.
What protection features does the LP8865YQDMTRQ1 provide, and how are faults reported?
The LP8865YQDMTRQ1 provides LED open/short detection, sense resistor open/short monitoring, cycle-by-cycle current limiting (3A typical), switching FET failure protection, thermal shutdown (165°C), and configurable thermal foldback. All faults are reported synchronously via the open-drain FAULT pin, which pulls low within microseconds of detection - enabling immediate system-level response such as disabling adjacent channels or logging diagnostic trouble codes in ASIL-B automotive ECUs.
LP8865YQDMTRQ1 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)
LP8865YQDMTRQ1 FAQ
1.How can I place an order for LP8865YQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8865YQDMTRQ1 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 LP8865YQDMTRQ1 reliable?
The price and inventory of LP8865YQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8865YQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8865YQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8865YQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8865YQDMTRQ1?
LP8865YQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8865YQDMTRQ1 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 LP8865YQDMTRQ1?
For technical support, including LP8865YQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8865YQDMTRQ1 requirements.
6.How does Aetrix verify that LP8865YQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8865YQDMTRQ1 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 LP8865YQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8865YQDMTRQ1?
All LP8865YQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8865YQDMTRQ1, 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 LP8865YQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8865YQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8865YQDMTRQ1 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
