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Texas Instruments LP8868UQDMTRQ1
- Part No.:
- LP8868UQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8868UQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
LP8868UQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver supporting boost topology with integrated 5.2A/150mΩ low-side MOSFET, 4.5V–65V input range, 100kHz–2.2MHz configurable switching frequency, and 150ns minimum PWM pulse width for inductive fast dimming (IFD). It delivers up to 4A output current in buck mode and enables high-precision analog (256:1 ratio), PWM, hybrid, and flexible dimming in infotainment backlighting.
For engineers reviewing the LP8868UQDMTRQ1 datasheet, LP8868UQDMTRQ1 pinout, LP8868UQDMTRQ1 application, or LP8868UQDMTRQ1 equivalent, this device requires attention to its disabled spread spectrum (vs. X/Y/Z variants), VSON-14 package thermal pad grounding, CSP/CSN current-sense interface, FSET resistor-based frequency tuning, and fault reporting via open-drain FAULT pin in safety-critical automotive lighting designs.
Technical Context
The LP8868UQDMTRQ1 implements adaptive off-time current-mode control with smart sampling to achieve inductive fast dimming (IFD) and maintain stable LED current regulation across wide duty cycles. Its error amplifier output (COMP) interfaces with external RC networks to set loop bandwidth and soft-start time, while internal 200mV current-sense reference ensures ±3% LED current accuracy at full scale.
Topology selection is fixed by variant: LP8868UQDMTRQ1 is boost-only, with OVP pin used for overvoltage protection and LED open detection-distinct from buck variants using UVP. The FSET pin accepts 9kΩ–232kΩ resistors to set switching frequency from 2.2MHz down to 100kHz, and the TEMP pin supports configurable thermal foldback curves via RTEMP to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost only - determines external component selection (inductor, diode, OVP divider) and disables buck/buck-boost configurations |
| Input Voltage Range | 4.5V to 63V - supports 12V/24V/48V automotive battery rails including cold-crank and load-dump transients |
| Switching Frequency | 100kHz to 2.2MHz - adjustable via FSET resistor; higher frequencies reduce inductor size but increase switching loss |
| Integrated MOSFET | 5.2A peak, 150mΩ RDS(on) - eliminates external switch; thermal design must accommodate 1.5W conduction loss at 4A |
| PWM Dimming Minimum Pulse | 150ns - enables >10,000:1 effective dimming ratio with precise brightness control in HUD and cluster displays |
| Current Sense Threshold | 200mV ±3% - sets LED current via Rsense; accuracy maintained across –40°C to +125°C junction temperature |
| Spread Spectrum | Disabled - distinguishes LP8868UQDMTRQ1 from X/Y/Z variants; improves low-brightness PWM stability at expense of EMI margin |
Pinout & Package
VSON-14 package (4.5mm × 3mm) with exposed thermal pad tied to PGND/AGND; requires 6×6mm PCB copper pour and ≥4 thermal vias for 39.1°C/W θJA performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, PGND | Power ground | High-current return path for MOSFET and inductor; must be low-impedance plane connected to thermal pad |
| 2, AGND | Analog ground | Reference for COMP, FSET, TEMP, ADIM/HD; star-connected to PGND at single point near IC |
| 3, VIN | Main power input | Accepts 4.5V–65V; requires ≥10µF ceramic + bulk capacitor within 5mm of pin |
| 4, VCC | Internal LDO output | 5.15V ±3% @ 47mA max; supplies internal circuitry; decoupled with 1µF 10V X7R to AGND |
| 5, ADIM/HD | Analog/hybrid dimming control | Configures dimming mode: pull-high = PWM-only, pull-low = hybrid, PWM input = analog dimming |
| 6, EN/PWM | Enable/dimming input | Pull-high = always-on, pull-low = disable, PWM signal = PWM dimming; 150ns min pulse width supported |
| 7, FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal shutdown, or cycle-by-cycle overcurrent; requires 4.7kΩ pull-up to VCC |
| 8, TEMP | Thermal foldback programming | Resistor-to-ground sets foldback start temperature (130°C typical) and slope; no external bias required |
| 9, FSET | Switching frequency set | Resistor-to-ground selects 100kHz–2.2MHz; 59kΩ = 400kHz; tolerance directly impacts frequency accuracy |
| 10, COMP | Error amplifier output | Connects to RC network for loop compensation; capacitor value sets bandwidth and soft-start time |
| 11, OVP | Overvoltage protection input | Resistive divider monitors output voltage; triggers shutdown if exceeds threshold set by divider ratio |
| 12, CSN | Current sense negative | Low-side sense node; 100Ω series resistor recommended to suppress noise coupling into CSP/CSN pair |
| 13, CSP | Current sense positive | High-side sense node; differential pair with CSN measures LED current via external Rsense |
| 14, SW | Switching node | Connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout and guard ring |
| Thermal Pad | PGND/AGND connection | Must be soldered to solid copper pour; ≥4 thermal vias (0.3mm diameter) required for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - enables use in instrument clusters and HUD without derating |
| Inductive Fast Dimming (IFD) | 150ns PWM pulse capability with adaptive off-time control - achieves flicker-free dimming down to 0.01% brightness in automotive displays |
| Configurable thermal foldback | RTEMP-to-ground sets foldback curve - allows dynamic current reduction before thermal shutdown, preserving display functionality during transient overheating |
| Four dimming modes | Analog (256:1), PWM (150ns min), hybrid, and flexible - selectable via ADIM/HD and EN/PWM logic states at startup without I²C |
| Integrated protection suite | LED open/short, cycle-by-cycle current limit, thermal shutdown, and switching FET failure detection - reduces system-level fault monitoring overhead |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
Use Scenario: Driving condition–adaptive backlighting for TFT LCD gauges with variable ambient light and driver eye position. IC Role / Device Role / Timing Role: Boost LED driver delivering 3A–4A constant current to multi-segment LED strings; provides synchronized PWM dimming with <150ns resolution for smooth brightness transitions. Use Value: Enables 10,000:1 effective dimming ratio and flicker-free operation at low brightness, meeting ISO 15008 photometric requirements for driver distraction mitigation. |
Use Scenario: Projection-based HUD with high-luminance LED light engine requiring precise intensity control under varying sunlight conditions. IC Role / Device Role / Timing Role: High-efficiency boost driver powering 8–10 LED series strings; uses analog dimming with 6-bit resolution for fine-grained luminance adjustment. Use Value: Delivers >90% efficiency at 1A output with 22µH inductor, reducing thermal load in confined HUD optical cavity and extending LED lifetime. |
| Automotive Infotainment Displays | Automotive Exterior Lighting Control |
Use Scenario: Central touchscreen backlighting with dynamic content-aware dimming and night/day mode switching. IC Role / Device Role / Timing Role: Constant-current boost driver supporting hybrid dimming (analog baseline + PWM fine-tuning); FAULT pin feeds MCU for real-time LED health monitoring. Use Value: Combines 256:1 analog range with 150ns PWM pulses to eliminate visible stepping artifacts during video playback and map rendering. |
Use Scenario: Adaptive front-lighting system (AFS) matrix LED control where individual zones require independent current regulation and fault isolation. IC Role / Device Role / Timing Role: Boost topology driver per LED zone; OVP pin configured for zone-specific overvoltage detection; TEMP pin enables per-zone thermal derating. Use Value: Provides per-string open/short detection and cycle-by-cycle current limiting - critical for ASIL-B functional safety compliance in exterior lighting modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8868XQDMTRQ1 | Same VSON-14 package and boost topology, but includes enabled spread spectrum (±7%, 2kHz modulation) | Better EMI compliance in noise-sensitive infotainment head units; slightly reduced low-brightness PWM stability | Select LP8868XQDMTRQ1 when CISPR 25 Class 5 radiated emissions limits must be met without added filtering |
| LP8868ZQDMTRQ1 | Buck topology variant with identical pinout and 6A current limit, but uses UVP instead of OVP and lacks boost-specific compensation | Suitable for low-Vf LED arrays (e.g., RGB clusters) where output voltage < input rail; not interchangeable in boost layouts | Choose LP8868ZQDMTRQ1 only when driving ≤3 LED series strings from 12V supply with minimal BOM cost |
Compared with LP8868XQDMTRQ1 and LP8868ZQDMTRQ1, the LP8868UQDMTRQ1 trades EMI reduction for superior low-duty-cycle PWM fidelity and is electrically incompatible with buck or spread-spectrum–dependent designs - making it optimal for HUD and cluster applications prioritizing dimming precision over EMC headroom.
Availability
LP8868UQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment backlighting requiring stable component supply across extended vehicle lifecycles and AEC-Q100-compliant production ramps.
Supply support for LP8868UQDMTRQ1 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 and ISO/TS 16949-certified manufacturing.
The LP8868-Q1 product line targets high-reliability automotive lighting systems, delivering multi-topology LED driving with integrated protection, precision dimming, and AEC-Q100 Grade 1 operation for safety-critical cockpit and exterior applications.
FAQ
What is the key functional difference between LP8868UQDMTRQ1 and LP8868XQDMTRQ1?
The LP8868UQDMTRQ1 disables spread spectrum modulation to optimize PWM dimming stability at low brightness levels, whereas LP8868XQDMTRQ1 enables it (±7% frequency dithering at 2kHz) for improved EMI performance. Both share identical boost topology, VSON-14 packaging, and 6A current limit, but their FSET and OVP configurations are functionally matched - making them layout-compatible yet functionally distinct in noise-sensitive vs. dimming-fidelity–critical applications. The LP8868UQDMTRQ1 remains the preferred choice for HUD and instrument cluster backlighting where flicker-free operation below 1% duty cycle is mandatory.
Does LP8868UQDMTRQ1 support buck topology operation?
No, LP8868UQDMTRQ1 is factory-configured for boost topology only. Its internal circuitry, pin functions (OVP instead of UVP), and datasheet-specified application schematics are exclusively validated for boost operation. Buck topology requires LP8868ZQDMTRQ1 or LP8868WQDMTRQ1 variants, which feature different protection pin mapping, current-sense architecture, and compensation networks. Attempting buck operation with LP8868UQDMTRQ1 will result in improper regulation, fault triggering, or potential damage due to mismatched feedback paths and undervoltage detection logic.
How is thermal foldback configured on LP8868UQDMTRQ1?
Thermal foldback on LP8868UQDMTRQ1 is set via a single resistor (RTEMP) connected between the TEMP pin and AGND. A 20kΩ resistor yields a foldback start temperature of 130°C, with higher resistance values lowering the threshold and lower values raising it. The foldback curve reduces LED current linearly above the threshold until thermal shutdown activates at 165°C. This configuration requires no external bias or active components - the LP8868UQDMTRQ1 internally generates the reference and slope. No calibration or trimming is needed, and the behavior is fully characterized across –40°C to +125°C ambient.
What is the minimum PWM pulse width supported by LP8868UQDMTRQ1, and why does it matter?
The LP8868UQDMTRQ1 supports a minimum PWM pulse width of 150ns, enabling >10,000:1 effective dimming ratio when combined with standard 100Hz–20kHz PWM frequencies. This specification is critical for automotive HUD and digital instrument clusters where visible brightness steps or flicker below 0.1% duty cycle cause driver distraction or violate ISO 15008 photometric standards. The 150ns capability stems from its adaptive off-time current-mode control and high-speed gate driver - allowing precise on-time control even at ultra-low duty cycles without compromising current regulation accuracy.
Can LP8868UQDMTRQ1 drive multiple LED strings independently?
No, LP8868UQDMTRQ1 drives a single LED string in boost configuration. It features one CSP/CSN current-sense pair and one switching node (SW), limiting it to single-string constant-current operation. For multi-string applications (e.g., RGB backlighting), multiple LP8868UQDMTRQ1 devices must be used in parallel with synchronized PWM inputs, or a dedicated multi-channel driver like the LP5569 should be selected. The FAULT pin reports aggregate faults only - no per-string diagnostics are provided, and current matching between parallel channels requires careful layout and matched Rsense tolerances.
LP8868UQDMTRQ1 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-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)
LP8868UQDMTRQ1 FAQ
1.How can I place an order for LP8868UQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8868UQDMTRQ1 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 LP8868UQDMTRQ1 reliable?
The price and inventory of LP8868UQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8868UQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8868UQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8868UQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8868UQDMTRQ1?
LP8868UQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8868UQDMTRQ1 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 LP8868UQDMTRQ1?
For technical support, including LP8868UQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8868UQDMTRQ1 requirements.
6.How does Aetrix verify that LP8868UQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8868UQDMTRQ1 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 LP8868UQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8868UQDMTRQ1?
All LP8868UQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8868UQDMTRQ1, 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 LP8868UQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8868UQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8868UQDMTRQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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