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Texas Instruments LP8868VQDMTRQ1
- Part No.:
- LP8868VQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8868VQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,989
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Product details
Overview
LP8868VQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver supporting buck-boost topology, integrated 5.2A/150mΩ low-side MOSFET, 4.5V–65V input range, and inductive fast dimming (IFD) with 150ns PWM pulse width capability - deployed in instrument clusters and HUDs requiring high-current, EMI-robust LED control.
For engineers reviewing the LP8868VQDMTRQ1 datasheet, LP8868VQDMTRQ1 pinout, LP8868VQDMTRQ1 application, or LP8868VQDMTRQ1 equivalent, key selection criteria include its buck-boost topology support, disabled spread spectrum for stable low-brightness performance, VSON-14 package thermal characteristics, and dual-dimming interface (ADIM/HD + EN/PWM) configuration logic.
Technical Context
The LP8868VQDMTRQ1 implements adaptive off-time current-mode control with configurable 100kHz–2.2MHz switching frequency via external FSET resistor, enabling precise average current regulation across wide input/output conditions. Its IFD architecture uses smart sampling and internal 200mV current-sense reference to achieve high dimming accuracy at low duty cycles.
It integrates fault detection including LED open/short, sense-resistor failure, cycle-by-cycle current limiting (6.5A typical), and configurable thermal foldback (130°C start, 165°C shutdown). The FAULT pin provides open-drain fault signaling, while TEMP and OVP pins allow resistor-programmable protection thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost - supports common-cathode LED strings with flexible output voltage > VIN or < VIN. |
| Input Voltage Range | 4.5V to 63V - compatible with 12V/24V/48V automotive battery systems including cold-crank and load-dump transients. |
| Integrated MOSFET | 5.2A continuous, 150mΩ RDS(on) - eliminates external switch, reduces BOM count, enables compact PCB layout. |
| PWM Dimming Minimum Pulse Width | 150ns - enables ultra-high dimming ratios (>10,000:1) without flicker in HUD and cluster backlighting. |
| Switching Frequency Range | 100kHz to 2.2MHz - adjustable via FSET pin resistor; higher frequencies reduce inductor size, lower frequencies improve efficiency. |
| Thermal Protection | Configurable thermal foldback (130°C start) and shutdown (165°C) - 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 mounting locations. |
Pinout & Package
VSON-14 package (4.5mm × 3mm, wettable flank), thermally enhanced with exposed power ground pad. Pin functions are topology-dependent; for buck-boost mode, SW connects to inductor/diode node, CSP/CSN sense LED current, OVP sets overvoltage threshold, and ADIM/HD selects dimming mode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, PGND | Power ground | Low-impedance return path for high-current switching loop; must be connected to thermal pad. |
| 2, AGND | Analog ground | Reference for error amplifier and sensing circuitry; separate from PGND to minimize noise coupling. |
| 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 regulated supply for internal logic; requires 1µF/10V ceramic capacitor to AGND. |
| 5, ADIM/HD | Dimming mode select | Pull high for PWM-only, pull low for hybrid dimming, apply PWM signal for analog dimming - configures dimming behavior at startup. |
| 6, EN/PWM | Enable / PWM input | Pull high for always-on, pull low to disable, apply PWM signal for PWM dimming - dual-function pin with 150ns minimum pulse width support. |
| 7, FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal fault, or current-limit event; requires external pull-up for system-level fault monitoring. |
| 8, TEMP | Thermal foldback programming | Connect resistor to GND to set thermal foldback curve slope - enables graded current reduction before shutdown. |
| 9, FSET | Frequency setting | Resistor-to-GND sets switching frequency (100kHz–2.2MHz); 59kΩ = 400kHz, 9kΩ = 2.2MHz. |
| 10, COMP | Error amplifier output | Connect RC network to GND to tune compensation bandwidth and soft-start time - critical for stability in buck-boost configurations. |
| 11, OVP | Overvoltage protection | Resistor divider sets LED string overvoltage threshold - prevents damage during open-circuit or overvoltage transients. |
| 12, CSN | Current sense negative | Low-side current sense input; 100Ω series resistor recommended to suppress noise injection. |
| 13, CSP | Current sense positive | High-side current sense input; forms differential pair with CSN for 200mV reference-based current regulation. |
| 14, SW | Switching node | Internal low-side MOSFET drain; connects to inductor and Schottky diode - high dv/dt node requiring tight layout and guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns PWM pulses with minimal current overshoot, achieving >10,000:1 dimming ratio in HUD and cluster applications without visible flicker. |
| Topology Flexibility | Single IC supports buck, boost, and buck-boost topologies via pin-strapping and external component selection - reduces design reuse effort across lighting subsystems. |
| Integrated Protection Suite | Includes LED open/short, sense-resistor fault, cycle-by-cycle current limit (6.5A), thermal foldback, and thermal shutdown - eliminates need for discrete fault monitoring circuitry. |
| Configurable Switching Frequency | 100kHz–2.2MHz range via FSET resistor allows optimization of efficiency (low fSW) vs. size (high fSW) without changing IC or layout. |
| AEC-Q100 Grade 1 Compliance | Validated for –40°C to +125°C ambient operation with full electrical characterization - meets functional safety requirements for ASIL-B instrument cluster designs. |
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: Buck-boost LED driver delivering up to 4A constant current with inductive fast dimming for seamless luminance transitions. Use Value: 150ns PWM resolution enables flicker-free dimming down to 0.01% brightness, meeting OEM visual comfort specifications. |
Use Scenario: Powering high-luminance projection LEDs in windshield-mounted HUD modules requiring thermal resilience and EMI control. IC Role / Device Role / Timing Role: High-efficiency buck-boost controller with integrated 150mΩ MOSFET and programmable thermal foldback for sustained 3A operation. Use Value: Configurable 130°C thermal foldback prevents brightness droop during prolonged high-temperature operation without hard shutdown. |
| Automotive Infotainment Displays | Automotive Exterior Lighting Control |
Use Scenario: Backlighting TFT LCDs in center-stack infotainment units with ambient light-adaptive dimming. IC Role / Device Role / Timing Role: Analog + PWM hybrid dimming controller using ADIM/HD and EN/PWM pins for multi-level brightness control. Use Value: Dual-dimming interface allows simultaneous analog coarse adjustment and PWM fine-tuning - simplifies MCU firmware and improves responsiveness. |
Use Scenario: Driving position lamps or DRLs with variable-output current and fault-tolerant operation in front-end modules. IC Role / Device Role / Timing Role: Fault-aware LED driver with LED open/short detection and FAULT pin signaling for ASIL-A compliant diagnostics. Use Value: Integrated open-drain FAULT output enables direct connection to microcontroller GPIO for real-time lamp status reporting without external comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8868YQDMTRQ1 | Same VSON-14 package and buck-boost topology, but includes enabled spread spectrum for lower EMI. | Better suited for EMI-sensitive environments (e.g., radar-co-located modules); trades slight brightness ripple for reduced filtering cost. | Select LP8868YQDMTRQ1 when EMI compliance is prioritized over absolute low-brightness stability. |
| LP8868VQDGNRQ1 | Same buck-boost functionality and disabled spread spectrum, but in HVSSOP-12 package (4mm × 4.9mm). | Larger footprint but improved thermal resistance (RθJA = 38.3°C/W vs. 39.1°C/W) and easier manual assembly/rework. | Select LP8868VQDGNRQ1 when thermal margin is constrained or board-level rework capability is required. |
Compared with LP8868VQDMTRQ1, LP8868YQDMTRQ1 adds spread spectrum for EMI reduction at the cost of minor low-brightness ripple, while LP8868VQDGNRQ1 offers identical electrical performance in a larger, thermally advantaged HVSSOP package - enabling trade-offs between EMI, thermal, and assembly requirements.
Availability
LP8868VQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment backlighting requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LP8868VQDMTRQ1 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 automotive qualification expertise.
The LP8868-Q1 product line delivers high-density, multi-topology LED drivers for automotive display and lighting systems, designed specifically to meet stringent AEC-Q100 Grade 1 requirements and support inductive fast dimming in safety-critical human-machine interfaces.
FAQ
What topology does the LP8868VQDMTRQ1 support, and how is it configured?
The LP8868VQDMTRQ1 supports buck-boost topology by default in its VSON-14 package configuration. Topology selection is determined by external circuit components (inductor, diode, feedback resistors) and not by internal strapping - no pin configuration is needed to enable buck-boost operation. The device's integrated low-side MOSFET and OVP pin allow flexible implementation across all three topologies without changing the LP8868VQDMTRQ1 itself.
Does the LP8868VQDMTRQ1 include spread spectrum modulation?
No, the LP8868VQDMTRQ1 has spread spectrum disabled - a deliberate design choice to ensure stable brightness performance at low dimming levels, especially critical for HUD and instrument cluster applications where flicker must be eliminated. This distinguishes it from the LP8868YQDMTRQ1 variant, which enables spread spectrum for EMI reduction.
What is the maximum output current capability of the LP8868VQDMTRQ1 in buck-boost mode?
The LP8868VQDMTRQ1 supports up to 4A output current in buck-boost topology, limited by its integrated 5.2A/150mΩ MOSFET and cycle-by-cycle current limit of 6.5A (typical). Actual achievable current depends on thermal design, input voltage, LED string voltage, and switching frequency - with proper heatsinking and 400kHz operation, sustained 4A is attainable per TI's typical application data.
How is thermal protection implemented in the LP8868VQDMTRQ1?
The LP8868VQDMTRQ1 implements dual-stage thermal protection: configurable thermal foldback begins at 130°C (set via resistor on TEMP pin), gradually reducing LED current to manage temperature, followed by hard thermal shutdown at 165°C. Hysteresis of 15°C ensures safe restart after cooldown. This staged response preserves system functionality longer than abrupt shutdown alone.
Can the LP8868VQDMTRQ1 drive common-cathode LED strings?
Yes, the LP8868VQDMTRQ1 supports common-cathode LED string configurations - a key advantage of its buck-boost topology and integrated low-side switch. This eliminates the need for high-side drivers or floating supplies, simplifying PCB layout and reducing component count in multi-string automotive lighting designs using the LP8868VQDMTRQ1.
LP8868VQDMTRQ1 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)
LP8868VQDMTRQ1 FAQ
1.How can I place an order for LP8868VQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8868VQDMTRQ1 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 LP8868VQDMTRQ1 reliable?
The price and inventory of LP8868VQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8868VQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8868VQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8868VQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8868VQDMTRQ1?
LP8868VQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8868VQDMTRQ1 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 LP8868VQDMTRQ1?
For technical support, including LP8868VQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8868VQDMTRQ1 requirements.
6.How does Aetrix verify that LP8868VQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8868VQDMTRQ1 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 LP8868VQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8868VQDMTRQ1?
All LP8868VQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8868VQDMTRQ1, 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 LP8868VQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8868VQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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