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Texas Instruments LP8868ZQDMTRQ1
- Part No.:
- LP8868ZQDMTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LP8868ZQDMTRQ1.pdf
- Description:
- LED DRIVER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8868ZQDMTRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver IC supporting buck topology, integrated 5.2A/150mΩ low-side MOSFET, 4.5V–65V input range, 100kHz–2.2MHz configurable switching frequency with spread spectrum, and inductive fast dimming (IFD) for high-accuracy LED current control in instrument clusters.
For engineers reviewing the LP8868ZQDMTRQ1 datasheet, LP8868ZQDMTRQ1 pinout, LP8868ZQDMTRQ1 application, or LP8868ZQDMTRQ1 equivalent, this device delivers precise analog/PWM/hybrid dimming with 150ns minimum PWM pulse width, thermal foldback configuration via external resistor, and fault reporting through open-drain FAULT pin - critical for functional-safety-compliant automotive lighting designs.
Technical Context
The LP8868ZQDMTRQ1 implements adaptive off-time current-mode control with smart sampling to enable inductive fast dimming (IFD), achieving high dimming accuracy across 1.17%–100% duty cycles. Its error amplifier output (COMP) interfaces with external RC networks to tune loop bandwidth and soft-start timing.
Switching frequency is set via resistor on FSET pin (100kHz–2.2MHz), and spread spectrum (±7%, 2kHz modulation) is enabled by default in Z-Q1 variant to reduce EMI. Thermal protection includes configurable foldback (via TEMP pin resistor) and fixed 165°C shutdown with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-only configuration; supports common-cathode LED strings with single-layer PCB layout. |
| Input Voltage Range | 4.5V to 63V - enables direct battery rail operation across 12V/24V/48V automotive systems. |
| Max Output Current | 4A continuous - determined by internal 5.2A MOSFET and thermal design margin at TJ ≤ 150°C. |
| Dimming Precision | 150ns minimum PWM pulse width - enables >10,000:1 effective dimming ratio with fast transient response. |
| Current Sense Threshold | 200mV ±3mV - sets LED current via external sense resistor; supports IFD accuracy down to 1.17% duty cycle. |
| Thermal Foldback Start | 130°C (RTEMP = 20kΩ) - programmable via external resistor to balance brightness vs. thermal derating. |
| EMI Reduction | Enabled spread spectrum (±7% center frequency, 2kHz modulation) - reduces peak radiated emissions without filter redesign. |
Pinout & Package
VSON-14 package (4.5mm × 3mm, wettable flank), thermally enhanced with exposed power ground pad. Pin functions are topology-specific; buck-mode pin mapping validated per TI SLVSH98B Figure 5-1 and Table 5-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power ground reference | Low-impedance return path for high-current switch node; must be connected to thermal pad and system GND plane. |
| 2 AGND | Analog ground reference | Separate low-noise reference for COMP, TEMP, FSET, and sensing circuitry; star-connected to PGND at single point. |
| 3 VIN | Main power input | Accepts 4.5V–63V unregulated automotive supply; requires local 10µF ceramic + bulk capacitor. |
| 4 VCC | Internal LDO output | 5.15V ±0.15V regulated supply for internal logic; requires 1µF/10V X7R capacitor to AGND. |
| 5 ADIM/HD | Dimming mode control | Pull-low enables hybrid dimming; pull-high selects PWM-only; PWM signal input enables analog dimming. |
| 6 EN/PWM | Enable/dimming input | Pull-high enables device; PWM input controls brightness; <57ms low pulse disables output. |
| 7 FAULT | Open-drain fault indicator | Pulls low on LED open/short, overtemperature, or current-limit fault; requires external pull-up resistor. |
| 8 TEMP | Thermal foldback programming | Resistor-to-GND sets foldback curve start temperature (130°C nominal); no external bias required. |
| 9 FSET | Switching frequency control | Resistor-to-GND sets fSW from 100kHz (232kΩ) to 2.2MHz (9kΩ); spread spectrum active by default. |
| 10 COMP | Error amplifier output | Connect RC network to AGND to set compensation pole/zero; determines stability and soft-start time. |
| 11 UVP | LED open detection threshold | Resistor divider sets undervoltage threshold for LED string open-circuit detection in buck topology. |
| 12 CSP / 13 CSN | Current sense differential inputs | 200mV threshold across external sense resistor; CSP connects to LED cathode side, CSN to GND. |
| 14 SW | Switching node | Internally connected to low-side MOSFET drain; connects to inductor and Schottky diode anode in buck layout. |
| Thermal Pad | Power ground & thermal path | Must be soldered to large copper pour for RθJB = 14.7°C/W; electrically tied to PGND internally. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables accurate current regulation during rapid PWM transitions via adaptive off-time sampling - critical for HUD flicker suppression. |
| Configurable Thermal Foldback | Adjustable via single resistor on TEMP pin to define brightness reduction slope before shutdown - preserves display visibility under thermal stress. |
| Spread Spectrum EMI Reduction | ±7% frequency dithering at 2kHz modulates spectral energy - reduces peak conducted/radiated noise without increasing filter size or cost. |
| Multi-Dimming Flexibility | Hardware-selectable analog, PWM, hybrid, or flexible dimming via ADIM/HD and EN/PWM pin states - eliminates firmware dependency for basic control. |
| Integrated Protection Suite | Includes cycle-by-cycle current limit, LED open/short detection, sense resistor fault monitoring, and thermal shutdown - meets ASIL-B diagnostic coverage requirements. |
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 LED driver delivering stable 3A constant current with 150ns PWM resolution for flicker-free segment illumination. Use Value: Enables >10,000:1 contrast ratio via hybrid dimming while maintaining color consistency across temperature (-40°C to +125°C). |
Use Scenario: Powering high-brightness laser-illuminated HUD combiners requiring precise luminance control. IC Role / Device Role / Timing Role: High-efficiency buck regulator driving multi-string LEDs with inductive fast dimming for real-time brightness adaptation. Use Value: Achieves sub-millisecond dimming response and <1% current ripple - essential for minimizing image ghosting in moving HUD projections. |
| Automotive Infotainment Displays | Exterior Lighting Control Modules |
|
Use Scenario: Backlighting TFT-LCD center consoles with ambient light-adaptive dimming and thermal derating. IC Role / Device Role / Timing Role: Constant-current LED driver with programmable thermal foldback to sustain brightness during prolonged GPU/CPU thermal events. Use Value: Maintains display readability at 85°C junction temperature via resistor-configured foldback curve - avoids abrupt brightness collapse. |
Use Scenario: Driving position lamp or DRL LED strings in compact ECU modules with limited heatsinking. IC Role / Device Role / Timing Role: Integrated buck controller with 5.2A MOSFET eliminating external switch - reduces BOM count and PCB area. Use Value: Delivers 4A output in 4.5mm × 3mm VSON package with RθJB = 14.7°C/W - enables convection-cooled designs without forced air. |
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 buck topology, but configured for boost operation; higher 6A current limit. | Requires boost inductor and output capacitor; unsuitable for direct-battery buck applications below 12V. | Select only when driving high-Vf LED strings (>VIN) where buck topology cannot regulate. |
| LP8868YQDMTRQ1 | Same VSON-14 package and buck-boost topology; identical 6A current limit and spread spectrum. | Supports wide Vout/Vin ratios; requires additional external components for buck-boost operation. | Choose when LED string voltage varies across input rail (e.g., start-stop 6V–16V systems with 10V–30V Vf). |
Compared with LP8868XQDMTRQ1 and LP8868YQDMTRQ1, the LP8868ZQDMTRQ1 provides optimal efficiency and layout simplicity for fixed-ratio buck applications - avoiding unnecessary complexity and component count when output voltage remains below input rail.
Availability
LP8868ZQDMTRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and infotainment backlighting requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LP8868ZQDMTRQ1 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 lighting solutions.
The LP8868-Q1 product line was designed specifically for AEC-Q100 Grade 1 automotive LED lighting applications - emphasizing functional safety, thermal robustness, and EMI resilience in harsh vehicle environments.
FAQ
What topology does the LP8868ZQDMTRQ1 support?
The LP8868ZQDMTRQ1 is configured exclusively for buck topology operation, as confirmed by TI's comparison table and VSON pinout documentation. It integrates a 5.2A/150mΩ low-side MOSFET optimized for step-down LED current regulation from 4.5V–65V input rails to lower-voltage LED strings. This differs from other variants like LP8868XQDMTRQ1 (boost) and LP8868YQDMTRQ1 (buck-boost).
Does the LP8868ZQDMTRQ1 include spread spectrum EMI reduction?
Yes, the LP8868ZQDMTRQ1 has spread spectrum enabled by default, per TI SLVSH98B revision August 2025. It applies ±7% frequency dithering at 2kHz modulation to reduce peak EMI emissions - a key differentiator from LP8868WQDMTRQ1, which disables this feature for improved low-brightness stability.
What is the maximum output current capability of the LP8868ZQDMTRQ1?
The LP8868ZQDMTRQ1 supports up to 4A output current in buck topology, based on its integrated 5.2A MOSFET and thermal design limits. The datasheet specifies a 5.2A–6A cycle-by-cycle current limit (typical 6A) for LP8868Z/LP8868W variants, with practical output constrained by PCB thermal design and ambient conditions per RθJB = 14.7°C/W.
How is thermal foldback configured on the LP8868ZQDMTRQ1?
Thermal foldback on the LP8868ZQDMTRQ1 is configured using a single external resistor between the TEMP pin and AGND. A 20kΩ resistor sets the foldback start temperature to 130°C, with linear scaling - lower resistance lowers the threshold, higher resistance raises it. No external bias or active circuitry is required.
What dimming methods does the LP8868ZQDMTRQ1 support?
The LP8868ZQDMTRQ1 supports four hardware-configurable dimming methods: analog dimming (via ADIM input), PWM dimming (via EN/PWM), hybrid dimming (combined analog+PWM), and flexible dimming (dynamic mode switching). All are selected at startup using simple high/low logic states on ADIM/HD and EN/PWM pins - no I²C or register programming needed.
LP8868ZQDMTRQ1 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)
LP8868ZQDMTRQ1 FAQ
1.How can I place an order for LP8868ZQDMTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8868ZQDMTRQ1 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 LP8868ZQDMTRQ1 reliable?
The price and inventory of LP8868ZQDMTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8868ZQDMTRQ1 is usually 5 days.
3.What payment methods are accepted for LP8868ZQDMTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8868ZQDMTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8868ZQDMTRQ1?
LP8868ZQDMTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8868ZQDMTRQ1 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 LP8868ZQDMTRQ1?
For technical support, including LP8868ZQDMTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8868ZQDMTRQ1 requirements.
6.How does Aetrix verify that LP8868ZQDMTRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8868ZQDMTRQ1 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 LP8868ZQDMTRQ1 meets industry standards.
7.What is the process for return or replacement of LP8868ZQDMTRQ1?
All LP8868ZQDMTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8868ZQDMTRQ1, 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 LP8868ZQDMTRQ1 part is unused and in its original packaging.
Return procedure for LP8868ZQDMTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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