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Texas Instruments LP8869QPWPRQ1
- Part No.:
- LP8869QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8869QPWPRQ1.pdf
- Description:
- IC LED DRVR RGLTR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,913
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Product details
Overview
LP8869QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver IC with integrated boost/SEPIC DC-DC converter and three high-precision current sinks (OUT1–OUT3), each delivering up to 120 mA with 1% typical current matching. It operates from 4.5 V to 40 V input, supports adaptive output voltage control up to 45 V, and enables 10,000:1 dimming ratio via PWM at 100 Hz–20 kHz for LCD backlighting in instrument clusters and HUDs.
For engineers reviewing the LP8869QPWPRQ1 datasheet, LP8869QPWPRQ1 pinout, LP8869QPWPRQ1 application, or LP8869QPWPRQ1 equivalent, this device delivers functional safety capability, spread-spectrum EMI reduction, external SYNC compatibility, thermal shutdown, and comprehensive fault detection-including LED open/short, VIN OVP/UVLO/OCP, and boost OVP-critical for automotive display power design.
Technical Context
The LP8869QPWPRQ1 implements a current-mode peak-controlled DC-DC converter supporting both boost and SEPIC topologies, with switching frequency adjustable from 300 kHz to 2.2 MHz via the FSET resistor. Its adaptive voltage control monitors LED cathode voltages in real time to dynamically minimize output voltage, reducing power loss and heat generation.
It integrates a 3.3-A internal switch FET, 4.3-V internal LDO (±0.15 V accuracy), and four analog blocks for fault management-including dedicated comparators for low/mid/high voltage thresholds (0.9 V / 1.9 V / 5.6–6 V) and temperature-based current derating via TSENSE/TSET pins-enabling robust operation across −40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 3 independent current sinks (OUT1–OUT3); OUT4 is GND-only in LP8869-Q1 |
| Max Output Voltage | 45 V - sufficient to drive multi-series LED strings under worst-case forward voltage and temperature drift |
| Input Voltage Range | 4.5 V to 40 V - supports automotive cold-crank (4.5 V) and load-dump (40 V) transients without external protection |
| Switch FET Current Limit | 3.35 A typical - enables reliable startup into heavy capacitive loads and transient overloads up to 3.7 A for 1.6 s |
| Current Matching | 1% typical - ensures uniform brightness across LED strings without per-channel calibration |
| PWM Dimming Range | 100 Hz to 20 kHz - avoids audible noise while enabling high-resolution brightness control in safety-critical displays |
| Thermal Shutdown | 165°C rising threshold with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design |
Pinout & Package
LP8869QPWPRQ1 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.50 mm × 4.40 mm with exposed thermal pad (EP) for efficient heat dissipation in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input & OVP sensing | Accepts 4.5–40 V battery rail; triggers OVP at 42 V (typical) to protect downstream circuitry |
| OUT1–OUT3 | LED current sink outputs | Each delivers up to 120 mA with <1% matching; unused sinks must be grounded to disable and exclude from adaptive voltage loop |
| FSET | Frequency setting input | Resistor-to-ground sets switching frequency from 300 kHz to 2.2 MHz; enables EMI optimization and layout flexibility |
| ISET | LED current programming input | Resistor-to-ground (20–129 kΩ) configures full-scale current per channel; tolerance directly impacts absolute brightness accuracy |
| SYNC | External clock synchronization input | Enables deterministic EMI suppression by locking DC-DC to system master clock; disables spread spectrum when asserted |
| FAULT | Open-drain fault indicator | Asserts low on any detected fault (LED open/short, thermal, OVP, UVLO); requires external pull-up for system-level monitoring |
| TSENSE / TSET | NTC temperature sensor interface | Supports automatic LED current derating based on external NTC; TSENSE senses divider midpoint, TSET connects to NTC ground leg |
| VDDIO/EN | Digital I/O supply & enable | Provides 5.25 V max supply for PWM/SYNC inputs; logic-high enables device; internal LDO powers digital blocks |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Output Voltage Control | Real-time adjustment of boost output to minimum required level based on actual LED string cathode voltages - reduces power loss and thermal stress by up to 15% vs fixed-output designs |
| Spread Spectrum Modulation | ±3% frequency dithering at 1-kHz rate - lowers peak EMI amplitude by >10 dB in CISPR 25 Class 5 band without adding filtering components |
| Functional Safety Capability | Documentation available for ISO 26262 ASIL-B system integration - includes FIT rate data, failure mode analysis, and diagnostic coverage guidance for safety mechanisms |
| Power-Line FET Control (SD) | Open-drain output drives external high-side FET to disconnect battery during fault conditions - enables fail-safe bus isolation per automotive safety requirements |
| Integrated 3.3-A Switch FET | Eliminates need for external MOSFET and gate driver - reduces BOM count, PCB area, and layout complexity while maintaining 92% peak efficiency at 400 kHz |
Applications
| Automotive Instrument Clusters | Heads-Up Displays (HUD) |
|---|---|
|
Use Scenario: Driving segmented or TFT LCD backlights in digital gauge clusters requiring high contrast, wide dimming range, and reliability across −40°C to +105°C cabin temperatures. IC Role / Device Role / Timing Role: Primary LED current controller with adaptive voltage regulation and synchronized PWM dimming; manages up to three independent backlight zones. Use Value: 10,000:1 dimming ratio eliminates visible stepping at low brightness; 1% current matching ensures uniform luminance across speedometer, tachometer, and warning indicators. |
Use Scenario: Powering high-brightness LED arrays in compact HUD combiner optics where thermal density and EMI are critical due to proximity to ADAS sensors. IC Role / Device Role / Timing Role: Integrated boost+current sink solution providing regulated 30–45 V output and precise current control for green/red/blue LED strings. Use Value: Spread spectrum and SYNC capability suppress EMI that could interfere with radar or camera modules; thermal derating via TSENSE prevents color shift during prolonged operation. |
| Smart Rearview Mirrors | Infotainment Center Displays |
|
Use Scenario: Backlighting electrochromic or LCD-based smart mirrors with auto-dimming functionality and glare reduction in varying ambient light. IC Role / Device Role / Timing Role: Constant-current driver with programmable dimming curve and fault-tolerant operation; interfaces with ambient light sensor and microcontroller via PWM. Use Value: Input UVLO/OVP protection maintains stable operation during vehicle ignition cycles; FAULT pin enables rapid system-level response to LED open-circuit events. |
Use Scenario: Supporting large-format center-stack displays in EVs and premium vehicles, where backlight uniformity, efficiency, and long-term reliability are mandatory. IC Role / Device Role / Timing Role: High-efficiency LED driver with integrated LDO powering display timing controllers and interface logic; handles 12 V nominal and 40 V load-dump conditions. Use Value: 4.3-V ±0.15 V LDO output powers display TCON reliably; 3.35-A internal FET sustains peak currents during screen wake-up without external component derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8867QPWPRQ1 | 4-channel version with identical pinout, same 120-mA/channel rating, but OUT4 functions as current sink (not GND); shares all electrical specs and features | Suitable where fourth LED string is required (e.g., dual-zone infotainment backlight); requires no layout change but adds channel control overhead | Select LP8867QPWPRQ1 only if fourth current sink is needed; LP8869QPWPRQ1 saves cost and simplifies routing when three channels suffice |
| TPS61196RGER | Single-channel 150-mA automotive LED driver with boost converter; lacks adaptive voltage control, spread spectrum, and multi-string matching | Applicable for simpler monochrome displays or auxiliary lighting; not suitable for multi-zone RGB or high-uniformity applications | Choose TPS61196RGER only for cost-sensitive single-string designs lacking stringent EMI or matching requirements |
Compared with LP8867QPWPRQ1, LP8869QPWPRQ1 removes OUT4 functionality to reduce pin count and simplify thermal management, while retaining identical performance per active channel; versus TPS61196RGER, it provides superior channel matching, adaptive efficiency, and comprehensive automotive fault coverage.
Availability
LP8869QPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, smart mirrors, and infotainment center displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8869QPWPRQ1 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 decades of automotive qualification expertise and AEC-Q100-compliant product development infrastructure.
The LP886x-Q1 product line was designed specifically for automotive LCD backlighting applications demanding high reliability, low EMI, and functional safety compliance in harsh environments - targeting instrument clusters, HUDs, and infotainment systems.
FAQ
What is the key difference between LP8869QPWPRQ1 and LP8867QPWPRQ1?
The LP8869QPWPRQ1 is a 3-channel variant of the LP886x-Q1 family, where Pin 12 (OUT4/GND) serves as a dedicated ground connection rather than a fourth current sink. All other specifications-including input range, current per channel (120 mA), adaptive voltage control, spread spectrum, and fault detection-are identical to LP8867QPWPRQ1. This makes LP8869QPWPRQ1 optimal for designs requiring exactly three LED strings without unused pins or routing complexity.
Does LP8869QPWPRQ1 support SEPIC topology, and what are the design implications?
Yes, LP8869QPWPRQ1 supports both boost and SEPIC modes via external component selection. In SEPIC configuration, it enables buck-boost operation - critical for applications where input voltage may exceed LED string forward voltage (e.g., 12 V battery driving 8-V strings). The IC automatically adapts output voltage in either mode, but SEPIC requires additional inductor and capacitor placement per TI's SNVSB83B datasheet Figure 12, and introduces ~2% lower peak efficiency versus boost at same conditions.
How does the adaptive voltage control in LP8869QPWPRQ1 improve system efficiency?
LP8869QPWPRQ1 continuously monitors cathode voltages of all active LED strings (OUT1–OUT3) and adjusts its boost output to the lowest level sufficient to maintain regulation - typically 0.5–1.5 V above the highest string's forward voltage. This reduces power dissipation in the current sinks and DC-DC stage, improving overall efficiency by up to 15% compared to fixed-output drivers, especially at partial brightness or varying temperature conditions.
Can LP8869QPWPRQ1 drive LED strings with different forward voltages simultaneously?
Yes. LP8869QPWPRQ1's adaptive voltage control operates on the highest cathode voltage among active strings (OUT1–OUT3), ensuring all strings remain properly biased regardless of individual VF variation due to binning or temperature. Each current sink operates independently, so mismatched strings (e.g., red/green/blue) can be driven with consistent current and brightness, provided total output voltage remains ≤45 V.
What fault conditions trigger the FAULT pin on LP8869QPWPRQ1, and how is recovery handled?
The FAULT pin on LP8869QPWPRQ1 asserts low for LED open/short, VIN OVP (≥42 V), VIN UVLO (≤3.85 V), VIN OCP (≥160 mV sense drop), boost OVP (FB ≥2.3 V), SW OVP, thermal shutdown (>165°C), or internal LDO fault. Recovery is automatic after fault removal and a 1-ms debounce delay; no reset pulse is required. For persistent faults, continuous FAULT assertion enables host MCU to initiate safe shutdown or diagnostic logging.
LP8869QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 45V
- Voltage - Output:
- 6V ~ 45V
- Current - Output / Channel:
- 120mA
- Frequency:
- 300kHz ~ 2.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LP8869QPWPRQ1 FAQ
1.How can I place an order for LP8869QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8869QPWPRQ1 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 LP8869QPWPRQ1 reliable?
The price and inventory of LP8869QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8869QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8869QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8869QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8869QPWPRQ1?
LP8869QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8869QPWPRQ1 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 LP8869QPWPRQ1?
For technical support, including LP8869QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8869QPWPRQ1 requirements.
6.How does Aetrix verify that LP8869QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8869QPWPRQ1 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 LP8869QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8869QPWPRQ1?
All LP8869QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8869QPWPRQ1, 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 LP8869QPWPRQ1 part is unused and in its original packaging.
Return procedure for LP8869QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8869QPWPRQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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