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Texas Instruments LP8868YQDMTRQ1
- Part No.:
- LP8868YQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8868YQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
LP8868YQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver supporting buck-boost topology, integrated 5.2A/150mΩ MOSFET, 4.5V–65V input range, 100kHz–2.2MHz configurable switching frequency with spread spectrum, and inductive fast dimming (IFD) for HUD and instrument cluster backlighting.
For engineers reviewing the LP8868YQDMTRQ1 datasheet, LP8868YQDMTRQ1 pinout, LP8868YQDMTRQ1 application, or LP8868YQDMTRQ1 equivalent, this page delivers verified topology-specific parameters, validated VSON-14 pin functions, confirmed thermal foldback configuration, real-world efficiency curves across brightness levels, and direct alternative comparisons for automotive lighting design.
Technical Context
The LP8868YQDMTRQ1 implements adaptive off-time current-mode control with smart sampling to enable inductive fast dimming (IFD), achieving 150ns minimum PWM pulse width and high dimming accuracy across analog, PWM, hybrid, and flexible dimming modes. Its FSET pin sets switching frequency from 100kHz to 2.2MHz via external resistor, while spread spectrum (±7%, 2kHz modulation) reduces EMI peaks.
It integrates a low-side NMOS switch with cycle-by-cycle current limiting (6.5A typical), configurable thermal foldback via TEMP pin resistor, and dual-sense protection (LED open/short, sense resistor fault). The device supports common-cathode LED strings and single-layer PCB layout, with separate PGND/AGND pins and dedicated OVP pin for buck-boost operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost - enables stable LED current regulation across wide VIN-to-VOUT differentials, ideal for automotive battery-varying systems. |
| Input Voltage Range | 4.5V to 65V - accommodates 12V/24V/48V vehicle architectures including cold-crank and load-dump transients. |
| Switching Frequency | 100kHz to 2.2MHz - adjustable via FSET pin resistor; higher frequencies allow smaller magnetics, lower frequencies improve efficiency and thermal performance. |
| Integrated MOSFET | 5.2A continuous, 150mΩ RDS(on) - eliminates external power switch, reduces BOM count and layout complexity for compact designs. |
| Dimming Performance | 150ns minimum PWM pulse width + analog dimming (256:1 ratio) - enables precise, flicker-free brightness control down to 0.1% duty cycle for HUD contrast management. |
| Thermal Protection | Configurable thermal foldback (via TEMP pin resistor) + 165°C shutdown - maintains safe junction temperature under sustained high-power operation in sealed enclosures. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C TA) - qualified for under-hood and dashboard-mounted automotive applications without derating. |
Pinout & Package
VSON-14 package (4.5mm × 3mm), thermally enhanced with exposed power ground pad; designed for high-power density automotive LED driver layouts requiring minimal board area and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, PGND | Power ground reference | Low-impedance return path for high-current switching node; must be connected directly to thermal pad for optimal thermal performance. |
| 2, AGND | Analog ground reference | Separate ground for precision current sensing and error amplifier; requires star-point connection to PGND near IC to avoid noise coupling. |
| 3, VIN | Main input supply | Accepts 4.5V–65V DC; connects to bulk capacitor and EMI filter; internal UVLO (3.2V rising) prevents startup during undervoltage. |
| 4, VCC | Internal LDO output | 5.15V ±0.15V regulated supply for internal circuitry; requires 1μF/10V ceramic capacitor to GND for stability and soft-start timing. |
| 5, ADIM/HD | Analog/hybrid dimming control | Pull-low enables hybrid dimming; PWM input enables analog dimming; defines dimming method at power-up based on logic state. |
| 6, EN/PWM | Enable or PWM dimming input | Pull-high enables device; PWM signal controls brightness; minimum 5μs pulse required to initiate dimming mode after VCC rise. |
| 7, FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal shutdown, or current-limit fault; requires external pull-up for system-level fault reporting. |
| 8, TEMP | Thermal foldback configuration | Connect resistor to GND to set thermal foldback starting point (e.g., 20kΩ = 130°C); enables gradual current reduction before shutdown. |
| 9, FSET | Switching frequency set | Resistor to GND selects frequency (e.g., 59kΩ = 400kHz); spread spectrum enabled by default for LP8868YQDMTRQ1. |
| 10, COMP | Error amplifier compensation | External RC network sets loop bandwidth and soft-start time; critical for stability with varying LED string impedance and inductor values. |
| 11, OVP | Overvoltage protection input | Resistor divider sets LED open-circuit detection threshold; used in boost/buck-boost topologies to prevent overvoltage damage. |
| 12, CSN | Current sense negative | Low-side current sense input; 100Ω series resistor recommended to reduce noise coupling into high-gain sensing path. |
| 13, CSP | Current sense positive | High-side current sense input; forms differential pair with CSN to measure LED current with 200mV reference threshold. |
| 14, SW | Switching node | Connects internally to low-side MOSFET drain; interfaces with power inductor and Schottky diode; requires tight layout and Kelvin routing. |
| Pad, Thermal Pad | Power ground and thermal sink | Must be soldered to large copper pour for thermal conduction; electrically tied to PGND; improves RθJA to 39.1°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns minimum PWM pulse width with adaptive off-time control, delivering >10,000:1 effective dimming ratio for HUD black-level fidelity. |
| Multi-topology flexibility | Single IC supports buck-boost configuration out-of-box - eliminates need for separate boost/buck drivers in multi-string automotive displays. |
| Spread spectrum EMI reduction | ±7% frequency dithering at 2kHz modulates switching energy, lowering peak EMI by up to 10dB and easing CISPR 25 Class 5 compliance. |
| Configurable thermal management | TEMP pin resistor selection allows custom thermal foldback curve - preserves display brightness longer than fixed-threshold shutdown in thermally constrained clusters. |
| Integrated protection suite | Dual-fault detection (LED open/short + sense resistor fault), cycle-by-cycle current limit, and thermal shutdown ensure robust operation in safety-critical lighting systems. |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
|
Use Scenario: Driving condition-adaptive backlighting for TFT LCD gauges with variable ambient light and viewing angles. IC Role / Device Role / Timing Role: Buck-boost LED driver regulating constant current to 4–8 LED strings while maintaining <1% current matching across temperature. Use Value: Enables seamless brightness transition from daylight (100% duty) to night (0.1% duty) using IFD, eliminating visible stepping in analog dimming. |
Use Scenario: High-brightness projection illumination requiring precise luminance control and zero flicker at 120Hz+ refresh rates. IC Role / Device Role / Timing Role: Primary LED current controller with 150ns PWM resolution, supporting dynamic contrast enhancement via hybrid dimming. Use Value: Delivers >10,000:1 effective dimming range essential for HUD black-level accuracy and glare suppression in direct sunlight. |
| Automotive Infotainment Displays | Automotive Exterior Lighting Control |
|
Use Scenario: Central touchscreen backlight with gradient dimming zones and touch-responsive brightness scaling. IC Role / Device Role / Timing Role: Constant-current LED driver with flexible dimming mode selection (PWM/analog/hybrid) controlled via MCU GPIOs. Use Value: Reduces MCU firmware overhead by enabling dimming mode changes via simple pin strapping instead of I²C register writes. |
Use Scenario: Adaptive front-lighting system (AFS) auxiliary LED arrays requiring fault-tolerant current regulation and thermal derating. IC Role / Device Role / Timing Role: Secondary LED driver with OVP-based open-circuit detection and configurable thermal foldback for lamp module redundancy. Use Value: Maintains partial illumination during thermal stress via programmable foldback-meeting UNECE R149 functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8868XQDMTRQ1 | Boost-only topology; identical VSON-14 package, same 6.5A current limit and spread spectrum, but lacks buck-boost capability. | Restricted to applications where VOUT > VIN (e.g., 12V input → 48V LED string); cannot regulate when VOUT < VIN. | Select when only boost operation is needed and board space matches; not interchangeable without schematic revision. |
| LP8868ZQDMTRQ1 | Buck-only topology; same package and current rating, but no OVP pin or boost/buck-boost support; uses UVP pin instead. | Suitable only for low-VOUT LED strings (e.g., 1–3 LEDs @ 3.3V) with VIN > VOUT; no overvoltage protection for open-circuit events. | Choose for cost-sensitive buck-only designs; requires redesign of feedback and protection networks versus LP8868YQDMTRQ1. |
Compared with LP8868XQDMTRQ1 and LP8868ZQDMTRQ1, the LP8868YQDMTRQ1 uniquely supports buck-boost topology in the same VSON-14 footprint, enabling single-IC solutions for variable-output automotive displays without topology-specific layout variants or BOM splits.
Availability
LP8868YQDMTRQ1 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 LP8868YQDMTRQ1 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 LED driver innovation.
The LP8868-Q1 product line was engineered specifically for AEC-Q100-compliant automotive lighting systems, emphasizing multi-topology flexibility, inductive fast dimming, and robust fault handling in thermally demanding environments.
FAQ
What topology does the LP8868YQDMTRQ1 support, and how is it configured?
The LP8868YQDMTRQ1 supports buck-boost topology exclusively - confirmed by TI's comparison table and pin function documentation specifying OVP (not UVP) for overvoltage protection. It requires no external configuration; topology is fixed at manufacture and validated for 4.5V–65V input with output voltages both above and below VIN. This differs from LP8868XQDMTRQ1 (boost-only) and LP8868ZQDMTRQ1 (buck-only).
Does the LP8868YQDMTRQ1 include spread spectrum EMI reduction?
Yes, the LP8868YQDMTRQ1 includes enabled spread spectrum by default - explicitly stated in TI's comparison table and Section 7.3.1.2, which confirms ±7% frequency dithering at 2kHz modulation for all X/Y/Z-Q1 variants. This feature lowers peak EMI emissions and simplifies compliance with CISPR 25 Class 5 without external filtering components.
What is the maximum output current capability of the LP8868YQDMTRQ1 in buck-boost mode?
The LP8868YQDMTRQ1 delivers up to 4A output current in buck-boost topology, as specified in the "Features" section and confirmed in Table 6-5 for ILIM (6.5A typical cycle-by-cycle limit) and thermal derating curves. This enables driving high-brightness LED strings in automotive HUDs and digital clusters without external current boosting.
How is thermal foldback configured on the LP8868YQDMTRQ1?
Thermal foldback on the LP8868YQDMTRQ1 is configured via an external resistor connected between the TEMP pin and AGND - per Table 5-3 and Section 7.3.3. A 20kΩ resistor sets the foldback start temperature at 130°C, allowing gradual current reduction before thermal shutdown at 165°C. No programming interface or register access is required.
What package type and pin count does the LP8868YQDMTRQ1 use?
The LP8868YQDMTRQ1 uses the VSON-14 package (4.5mm × 3mm), with a thermally enhanced exposed pad. Pin count and layout match Figure 5-3 and Table 5-3 in the datasheet, confirming 14 signal pins plus thermal pad - distinct from the 12-pin HVSSOP variant used in LP8868YQDGNRQ1.
LP8868YQDMTRQ1 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)
LP8868YQDMTRQ1 FAQ
1.How can I place an order for LP8868YQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8868YQDMTRQ1 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 LP8868YQDMTRQ1 reliable?
The price and inventory of LP8868YQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8868YQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8868YQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8868YQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8868YQDMTRQ1?
LP8868YQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8868YQDMTRQ1 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 LP8868YQDMTRQ1?
For technical support, including LP8868YQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8868YQDMTRQ1 requirements.
6.How does Aetrix verify that LP8868YQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8868YQDMTRQ1 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 LP8868YQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8868YQDMTRQ1?
All LP8868YQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8868YQDMTRQ1, 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 LP8868YQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8868YQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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