My Inquiry
My Account
Texas Instruments LP8861QPWPRQ1
- Part No.:
- LP8861QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP8861QPWPRQ1.pdf
- Description:
- IC LED DRVR RGLTR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,958
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP8861QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver IC with integrated boost/SEPIC converter, four 100-mA precision current sinks, 300 kHz–2.2 MHz adjustable switching frequency, adaptive output voltage control up to 45 V, and 10,000:1 PWM dimming ratio at 100 Hz - used in instrument cluster backlighting requiring high EMI immunity and thermal fault management.
For engineers reviewing the LP8861QPWPRQ1 datasheet, LP8861QPWPRQ1 pinout, LP8861QPWPRQ1 application, or LP8861QPWPRQ1 equivalent, key selection criteria include input voltage range (4.5–40 V), current sink matching (1% typical), open/short LED fault detection, NTC-based thermal derating, and spread-spectrum EMI reduction - all critical for automotive display power integrity.
Technical Context
The LP8861QPWPRQ1 implements a current-mode boost/SEPIC controller with adaptive headroom voltage regulation: real-time monitoring of OUT1–OUT4 voltage enables dynamic VBOOST adjustment to minimize power loss. Its switching frequency is resistor-programmed via FSET and supports external synchronization on SYNC pin.
Four independent current sinks operate with matched accuracy (1% typ) and saturation voltage ≤0.7 V at 100 mA; brightness control uses direct PWM input (100 Hz–20 kHz) with 0.5 μs minimum ON/OFF time. Fault handling includes VIN OVP/UVLO/OCP, thermal shutdown (165°C), and open/short LED detection with FAULT pin assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports automotive stop/start and load-dump transients without external protection. |
| LED Current per Channel | Up to 100 mA - programmable via ISET resistor; enables driving medium-brightness LED strings in clusters or HUDs. |
| Current Matching | 1% typical - ensures uniform luminance across four independent backlight zones without software compensation. |
| Dimming Ratio | 10,000:1 at 100 Hz - delivers deep black levels and smooth grayscale in infotainment displays. |
| Boost Output Voltage | Up to 45 V - sufficient for series-connected LED strings in wide-format CID or AVN panels. |
| Switching Frequency | 300 kHz to 2.2 MHz - adjustable via RFSET; avoids AM radio band and enables compact magnetics. |
| Thermal Shutdown | 165°C (typ), 20°C hysteresis - protects die during sustained overtemperature events in sealed enclosures. |
| EMI Reduction | Spread spectrum + SYNC pin - lowers peak radiated emissions without sacrificing efficiency or stability. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.50 mm) with exposed thermal pad for enhanced power dissipation in automotive ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input / current sense reference | Primary supply input (4.5–40 V); also serves as reference for optional RISENSE overcurrent sensing. |
| LDO | Internal LDO output | 4.3 V ±0.15 V regulated supply for analog blocks; requires 1-μF decoupling to GND. |
| FSET | Frequency setting input | Resistor-to-GND sets switching frequency from 300 kHz to 2.2 MHz; enables EMI optimization. |
| VDDIO/EN | Digital supply & enable | 3.3 V logic supply and hardware enable; device powers up only when this pin is ≥1.65 V. |
| FAULT | Open-drain fault indicator | Asserts low on OVP, UVLO, OCP, thermal shutdown, or LED open/short - drives external MCU interrupt. |
| PWM | Brightness control input | Direct PWM interface (100 Hz–20 kHz); no internal PWM generator required - simplifies host timing design. |
| ISET | Current programming input | Resistor-to-GND sets full-scale LED current (24 kΩ–129 kΩ = 100 mA–20 mA); enables precise channel tuning. |
| OUT1–OUT4 | LED current sink outputs | Four independent, matched 100-mA sinks; unused channels must be tied to GND to disable and exclude from fault detection. |
| FB | Boost feedback input | Monitors VBOOST via resistive divider (5–150 kΩ); enables adaptive voltage control to minimize power loss. |
| SYNC | External clock input | Accepts 300–2200 kHz external clock; disables spread spectrum when pulled to GND, enables it when tied to VDDIO/EN. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Voltage Control | Real-time VBOOST adjustment based on LED sink headroom minimizes conduction losses and improves system efficiency by up to 8% vs fixed-output converters. |
| NTC-Based Thermal Derating | External NTC sensor on TSENSE/TSET pins reduces LED current linearly above threshold - extends LED lifetime and prevents thermal runaway in enclosed HUD modules. |
| Integrated Power-Line FET Control | SD pin drives external p-FET to disconnect VIN during faults - eliminates inrush current at startup and reduces standby power consumption below 20 μA. |
| Automotive Safety Monitoring | Dedicated open/short LED detection, VIN OVP/UVLO/OCP, and thermal shutdown with FAULT pin reporting - meets ASIL-B functional safety requirements for instrument clusters. |
| Low-EMI Architecture | Spread spectrum + SYNC capability + optimized layout guidelines reduce peak radiated emissions by >10 dBμV/m in 150–108 MHz band - simplifies EMC certification. |
Applications
| Automotive Instrument Cluster Backlight | Heads-Up Display (HUD) Lighting |
|---|---|
Use Scenario: Illuminating segmented TFT LCD gauges and warning icons under varying ambient light and temperature. IC Role / Device Role / Timing Role: Four-channel constant-current driver with adaptive VBOOST and thermal derating ensures consistent brightness and color fidelity across –40°C to +125°C. Use Value: 1% current matching eliminates visible luminance gradients between speedometer and tachometer zones; 10,000:1 dimming enables night-mode readability without halo artifacts. | Use Scenario: Powering high-luminance LED arrays projecting virtual images onto windshield combiners. IC Role / Device Role / Timing Role: Boost/SEPIC controller with 45-V output and spread-spectrum switching supplies stable current to parallel LED strings while suppressing EMI interference with HUD image processing. Use Value: Adaptive voltage control reduces thermal stress on LEDs during prolonged operation; FAULT pin triggers HUD brightness reduction before thermal shutdown occurs. |
| Central Information Display (CID) | Smart Mirror Rearview Lighting |
Use Scenario: Driving edge-lit LED bars behind large-format LCDs in center-stack infotainment systems. IC Role / Device Role / Timing Role: High-efficiency LED driver with 4.5–40 V input range handles cold-crank (4.5 V) and load-dump (40 V) events without reset or latch-up. Use Value: Integrated OVP/UVLO/OCP eliminates need for external TVS or crowbar circuits; 20-pin TSSOP fits tight board space behind 10.25″ display bezels. | Use Scenario: Controlling ambient and status lighting in electrochromic smart mirrors with integrated camera and sensors. IC Role / Device Role / Timing Role: Precision current sink with NTC thermal feedback maintains uniform illumination across mirror surface despite localized heating from adjacent electronics. Use Value: TSENSE/TSET interface enables closed-loop LED current reduction at 60°C - prevents mirror haze and preserves electrochromic layer longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8862QPWPRQ1 | Supports SEPIC topology only; no boost-only mode; 160-mA per channel; no I2C interface. | Higher current per channel but lacks adaptive VBOOST and spread spectrum - less suitable for EMI-sensitive HUDs. | Select LP8862QPWPRQ1 only when >100 mA/channel is required and EMI margin is available. |
| TPS61194QPWPRQ1 | No adaptive VBOOST; fixed-frequency 1.2 MHz; no thermal derating; open/short LED detection only. | Simpler implementation but lower efficiency in variable-string-length configurations - best for static, single-string CIDs. | Choose TPS61194QPWPRQ1 for cost-sensitive, non-thermal-critical applications where layout space is constrained. |
Compared with LP8862QPWPRQ1 and TPS61194QPWPRQ1, the LP8861QPWPRQ1 uniquely combines adaptive voltage control, spread-spectrum EMI reduction, and NTC-based thermal derating - making it the only option qualified for high-reliability HUD and digital instrument cluster backlighting where luminance stability and EMC compliance are non-negotiable.
Availability
LP8861QPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, and central information displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP8861QPWPRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The LP8861QPWPRQ1 belongs to TI's automotive LED driver product line, engineered specifically for high-reliability, low-EMI backlighting in digital instrument clusters and HUD systems - emphasizing thermal resilience, functional safety, and seamless integration with vehicle power architectures.
FAQ
What is the maximum LED string voltage supported by the LP8861QPWPRQ1?
The LP8861QPWPRQ1 supports a maximum boost output voltage of 45 V, as specified in its absolute maximum ratings and verified in the boost/SEPIC converter characteristics section. This allows driving series-connected LED strings up to approximately 12 white LEDs (3.5 V forward voltage each) while maintaining sufficient headroom for current regulation. The adaptive voltage control feature dynamically adjusts VBOOST to the minimum required level, improving efficiency without compromising string voltage margin.
Does the LP8861QPWPRQ1 require an external microcontroller to implement PWM dimming?
No, the LP8861QPWPRQ1 does not require an external microcontroller for PWM dimming. It accepts a direct PWM signal on the PWM pin (pin 7) with a recommended frequency range of 100 Hz to 20 kHz. The internal circuitry synchronizes LED current modulation precisely to the input PWM duty cycle, achieving a 10,000:1 dimming ratio at 100 Hz without firmware intervention. This simplifies system architecture and reduces BOM count in automotive display modules.
How does the LP8861QPWPRQ1 handle thermal protection for connected LEDs?
The LP8861QPWPRQ1 implements dual-layer thermal protection: first, internal die thermal shutdown activates at 165°C (typical) with 20°C hysteresis; second, external NTC-based LED current derating is enabled via TSENSE and TSET pins. When an NTC thermistor is connected in a bridge configuration, the device linearly reduces LED current above a user-defined temperature threshold - preventing LED overheating and extending lifetime in enclosed HUD or cluster housings. This feature is confirmed in the "LED Current Dimming With External Temperature Sensor" section of the datasheet.
Can unused current sink channels on the LP8861QPWPRQ1 be left floating?
No, unused current sink channels (OUT1–OUT4) on the LP8861QPWPRQ1 must be connected to GND, as explicitly stated in the Pin Functions table. Leaving them floating disables adaptive VBOOST control and excludes those channels from open/short LED fault detection - potentially causing incorrect fault reporting or unstable regulation. Grounding unused outputs ensures proper operation of the remaining active channels and maintains system-level safety integrity required for automotive applications.
What is the purpose of the SD pin on the LP8861QPWPRQ1, and how is it used?
The SD (Shutdown) pin (pin 19) on the LP8861QPWPRQ1 controls an external p-channel FET to disconnect the VIN supply during fault conditions or for standby power savings. When asserted, it actively pulls down the gate of the external FET, isolating the LP8861QPWPRQ1 and downstream boost components from the battery. This provides inrush current limiting at startup and reduces standby current to <20 μA - critical for always-on automotive modules. The SD pin is not a simple enable/disable; it integrates soft-start and fault-triggered disconnection, as detailed in Section 8.3.5 of the datasheet.
LP8861QPWPRQ1 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:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- 45V
- Current - Output / Channel:
- 100mA
- 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
LP8861QPWPRQ1 FAQ
1.How can I place an order for LP8861QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8861QPWPRQ1 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 LP8861QPWPRQ1 reliable?
The price and inventory of LP8861QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8861QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LP8861QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8861QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8861QPWPRQ1?
LP8861QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8861QPWPRQ1 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 LP8861QPWPRQ1?
For technical support, including LP8861QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8861QPWPRQ1 requirements.
6.How does Aetrix verify that LP8861QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LP8861QPWPRQ1 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 LP8861QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LP8861QPWPRQ1?
All LP8861QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP8861QPWPRQ1, 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 LP8861QPWPRQ1 part is unused and in its original packaging.
Return procedure for LP8861QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP8861QPWPRQ1 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
