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Texas Instruments LP8867QPWPRQ1
- Part No.:
- LP8867QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8867QPWPRQ1.pdf
- Description:
- IC LED DRVR RGLTR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:959
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Product details
Overview
LP8867QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver IC with integrated boost/SEPIC DC-DC converter and four 120-mA precision current sinks. It delivers adaptive output voltage control, 10,000:1 PWM dimming ratio at 100 Hz, and ±1% typical current matching for LCD backlighting in instrument clusters and HUDs.
For engineers reviewing the LP8867QPWPRQ1 datasheet, LP8867QPWPRQ1 pinout, LP8867QPWPRQ1 application, or LP8867QPWPRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade fault protection features, and real-world efficiency data across input voltages (6–16 V) and output currents (80–480 mA).
Technical Context
The LP8867QPWPRQ1 implements peak-current-mode DC-DC control with programmable switching frequency (300 kHz–2.2 MHz) via external RFSET resistor and supports both boost and SEPIC topologies. Its adaptive voltage control monitors LED cathode voltages in real time to dynamically minimize VOUT-reducing power loss and thermal stress without compromising string regulation.
Fault management includes dedicated open/short LED detection, VIN OVP/UVLO/OCP (41–44 V / 3.7–4.0 V / 135–186 mV), FB-based BST_OVP (2.3 V threshold), and thermal shutdown (165°C rising, 20°C hysteresis). The FAULT pin provides open-drain status signaling, while SD enables external power-line FET control for battery bus protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports automotive start-stop and load-dump transients without external pre-regulation |
| Max Output Voltage | 45 V - sufficient for driving multi-series LED strings in high-brightness HUD and cluster applications |
| LED Current per Channel | Up to 120 mA - configurable via ISET resistor (20 kΩ–129 kΩ); channels can be paralleled externally for higher current |
| Current Matching | ±1% (typical) - ensures uniform brightness across multiple display zones without software compensation |
| Dimming Ratio | 10,000:1 at 100 Hz - enables smooth, flicker-free brightness control in ambient-light-adaptive UIs |
| Switch FET Rating | 3.3 A (typical) - integrated high-side switch eliminates need for external MOSFET in most automotive backlight designs |
| Thermal Shutdown | 165°C (rising), 20°C hysteresis - protects against sustained overloads while allowing safe recovery during transient heating |
Pinout & Package
LP8867QPWPRQ1 is housed in a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed thermal pad (EP) for PCB-level heat dissipation. Junction-to-board thermal resistance is 22.4°C/W, enabling reliable operation at TA = +125°C under full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input & OVP sense | Accepts 4.5–40 V automotive rail; internal OVP triggers at 41–44 V to survive load dump |
| OUT1–OUT4 | LED current sink outputs | Four independent 120-mA constant-current sinks; unused channels must be grounded to disable and exclude from adaptive voltage loop |
| ISET | Current programming input | Resistor-to-ground sets all channel current (20 kΩ = 120 mA; 129 kΩ = ~20 mA) |
| FSET | Frequency programming input | RFSET resistor sets switching frequency from 300 kHz to 2.2 MHz; lower frequencies improve efficiency, higher frequencies reduce EMI filter size |
| FB | DC-DC feedback input | Monitors boost output via resistive divider; enables adaptive voltage control to minimize VOUT and power loss |
| SYNC | External clock input | Accepts 300–2200 kHz sync signal; disables spread spectrum when active; allows EMI alignment with system clocks |
| PWM | Brightness control input | Direct PWM interface (100 Hz–20 kHz); output follows input duty cycle with no added latency or phase shift |
| FAULT | Open-drain fault indicator | Asserts low on LED open/short, VIN OVP/UVLO/OCP, BST_OVP, thermal shutdown, or SW overvoltage |
| SD | Power-line FET control | Open-drain output for driving external high-side FET to disconnect battery during fault conditions |
| TSENSE / TSET | NTC temperature sensing inputs | Support automatic LED current derating using external NTC thermistor; TSET must be tied to GND if unused |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - meets automotive infotainment and cluster reliability requirements |
| Integrated boost/SEPIC controller | Eliminates need for external controller IC and gate driver; supports flexible topology selection based on LED string voltage requirements |
| Adaptive output voltage control | Reduces average VOUT by up to 30% vs fixed-output designs - directly lowers power dissipation and improves system efficiency |
| Spread spectrum & SYNC capability | ±3% frequency dithering or external synchronization - suppresses narrowband EMI peaks to meet CISPR 25 Class 5 limits |
| Comprehensive fault coverage | Detects and reports 7 distinct fault types via single FAULT pin - simplifies system-level diagnostics and ASIL-B functional safety implementation |
Applications
| Automotive Instrument Cluster Backlight | Heads-Up Display (HUD) Backlight |
|---|---|
Use Scenario: Driving segmented or full-array LED strings behind TFT-LCD or OLED displays in digital dashboards with dynamic brightness adaptation. IC Role / Device Role / Timing Role: Four-channel current sink with adaptive VOUT and 10,000:1 PWM dimming - regulates individual zones for contrast enhancement and glare reduction. Use Value: Enables pixel-level luminance control without external DACs or microcontroller intervention; ±1% current matching prevents visible banding across gauge graphics. | Use Scenario: Powering high-luminance LED arrays in compact optical combiner systems requiring stable current under wide temperature and input voltage variation. IC Role / Device Role / Timing Role: Integrated boost converter + 120-mA sinks - delivers regulated 37-V output from 6–16-V battery rail while maintaining <1% current drift from −40°C to +105°C. Use Value: Eliminates discrete boost stage and external current regulators - reduces BOM count by ≥7 components and saves >25 mm² PCB area. |
| Smart Rearview Mirror Backlight | Infotainment Display Backlight |
Use Scenario: Illuminating electrochromic or LCD-based smart mirrors with auto-dimming functionality and ambient light responsiveness. IC Role / Device Role / Timing Role: Temperature-compensated current sink using TSENSE/TSET pins - automatically reduces LED current above 85°C to prevent thermal runaway and lumen depreciation. Use Value: Extends LED lifetime by >3× versus fixed-current operation at elevated ambient temperatures; meets ISO 16750-4 thermal cycling requirements. | Use Scenario: Supporting dual-display infotainment systems with independent brightness control for main screen and secondary touch panel. IC Role / Device Role / Timing Role: Dual PWM inputs (via shared PWM pin and optional GPIO-controlled EN) - enables synchronized or staggered dimming sequences across displays. Use Value: Reduces MCU GPIO usage and firmware complexity; avoids frame tearing during simultaneous brightness transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8869QPWPRQ1 | 3-channel version with identical pinout, specs, and feature set; lacks OUT4 pin functionality | Suitable for cost-sensitive 3-string designs where fourth channel is unnecessary | Select LP8869QPWPRQ1 only when exactly three LED strings are required and board layout re-use is critical |
| TPS61196RGER | Single-channel 150-mA automotive LED driver with boost-only topology; no SEPIC support or adaptive VOUT | Targeted at simpler, lower-cost displays with single-string architecture and fixed output voltage | Choose TPS61196RGER for non-critical applications where thermal margin and EMI headroom are less constrained |
Compared with LP8869QPWPRQ1, LP8867QPWPRQ1 adds a fourth current sink without increasing footprint or thermal resistance - enabling higher display resolution backlights without redesign. Versus TPS61196RGER, it delivers superior efficiency via adaptive voltage control and broader topology flexibility, but requires more complex layout due to four-channel routing and thermal pad management.
Availability
LP8867QPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, smart mirrors, and infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LP8867QPWPRQ1 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 ICs, with decades of experience delivering AEC-Q100-qualified power management solutions.
The LP8867QPWPRQ1 belongs to TI's automotive LED driver product line, engineered specifically for high-reliability, low-EMI LCD and OLED backlighting in safety-critical cockpit displays.
FAQ
What is the maximum LED string voltage supported by LP8867QPWPRQ1?
The LP8867QPWPRQ1 supports up to 45 V on its LED output pins (OUT1–OUT4), enabling direct drive of multi-series LED strings commonly used in automotive instrument clusters and HUDs. This rating is validated across the full −40°C to +125°C operating temperature range and includes built-in overvoltage protection that triggers at 45 V to prevent damage during transients.
Does LP8867QPWPRQ1 support SEPIC topology in addition to boost mode?
Yes, LP8867QPWPRQ1 supports both boost and SEPIC DC-DC converter topologies. The mode is selected via external component configuration - SEPIC is used when LED string forward voltage may exceed input voltage (e.g., cold cranking at 6 V), while boost is optimal for higher VIN conditions. Both modes share the same adaptive voltage control and fault protection features.
How does the adaptive voltage control in LP8867QPWPRQ1 improve system efficiency?
LP8867QPWPRQ1 continuously monitors LED cathode voltages via its current sinks and dynamically adjusts the boost output voltage to the minimum level required - typically reducing VOUT by 20–30% compared to fixed-output drivers. This directly lowers conduction losses in the power stage and increases overall system efficiency by up to 8 percentage points, especially at partial load.
Can unused current sink channels on LP8867QPWPRQ1 be left floating?
No - unused current sink channels (OUT2, OUT3, OUT4) on LP8867QPWPRQ1 must be connected to ground to disable them and exclude them from the adaptive voltage control loop. Leaving them floating causes undefined behavior and may result in inaccurate VOUT regulation or fault triggering. Grounding also prevents leakage current from affecting adjacent channels.
What is the purpose of the SD pin on LP8867QPWPRQ1?
The SD (Shutdown) pin on LP8867QPWPRQ1 is an open-drain output designed to drive an external high-side power FET. During detected faults - such as LED short, VIN overvoltage, or thermal shutdown - the SD pin pulls low to disconnect the battery rail from the LED driver, providing hardware-level bus protection independent of MCU control.
LP8867QPWPRQ1 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
LP8867QPWPRQ1 FAQ
1.How can I place an order for LP8867QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8867QPWPRQ1 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 LP8867QPWPRQ1 reliable?
The price and inventory of LP8867QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8867QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8867QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8867QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8867QPWPRQ1?
LP8867QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8867QPWPRQ1 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 LP8867QPWPRQ1?
For technical support, including LP8867QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8867QPWPRQ1 requirements.
6.How does Aetrix verify that LP8867QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8867QPWPRQ1 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 LP8867QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8867QPWPRQ1?
All LP8867QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8867QPWPRQ1, 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 LP8867QPWPRQ1 part is unused and in its original packaging.
Return procedure for LP8867QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8867QPWPRQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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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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