LP8861QPWPRQ1 - 4-Ch LED Driver, SEPIC/Boost, AEC-Q100 | TI
MPN: LP8861QPWPRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.01 | $3.01 |
| 10 | $2.71 | $27.10 |
| 100 | $2.41 | $241.00 |
| 500 | $2.16 | $1,080.00 |
| 1,000 | $1.95 | $1,950.00 |
LP8861QPWPRQ1 Overview
An LED driver is a specialized power-management IC that converts a higher-voltage DC rail into precisely regulated currents for one or more strings of LEDs. The LP8861-Q1 belongs to the LED driver IC category within the broader power-management IC family (LED driver → display/lighting driver → power management IC → integrated circuit). It differs from a generic constant-voltage regulator in that it regulates current, not voltage, which is critical because LED luminance is set by forward current and LED forward voltage varies with temperature and bin.
Key features include four high-precision current sinks with PWM dimming input, spread-spectrum and adaptive-output-voltage operation to minimize power dissipation, and SEPIC/boost topology flexibility for 5 V to 24 V automotive battery systems. The Q1 suffix indicates AEC-Q100 qualification for automotive applications, and the device supports high dimming ratios for HUD, instrument-cluster, and rear-light functions. Its switching frequency range of 300 kHz to 2.2 MHz allows engineers to place the fundamental outside AM-band-sensitive frequencies for low-EMI compliance.
Architecturally, the LP8861-Q1 uses an asynchronous boost/SEPIC controller driving an external MOSFET, with internal current sinks regulating each of the four LED strings. Adaptive output voltage minimizes the voltage drop across the current sinks, dramatically reducing power dissipation in the IC and improving total system efficiency. Fault protection includes LED open/short detection, thermal shutdown, and input undervoltage lockout.
Typical applications include automotive infotainment displays, instrument-cluster backlighting, heads-up displays (HUD), and automotive exterior lighting such as daytime running lights and rear combination lamps. The wide 5 V to 24 V supply range accommodates cranking and load-dump transients typical of 12-V automotive electrical systems.
When designing with the LP8861-Q1, careful inductor and input/output capacitor selection is critical because the device operates over a wide switching-frequency range. The exposed thermal pad must be soldered to a sufficiently large copper pour to keep junction temperature within automotive limits (typically ≤125 °C).
Drop-in alternatives for LP8861QPWPRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LP8861QPWPPRQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LP8863QPWPRQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS61196PWPRQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LP8860QPWPRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LP8865CQPWPRQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LP8861QPWPRQ1 Maximum Ratings & Electrical Characteristics
| Topology | DC-DC Regulator, SEPIC, Step-Up (Boost) |
| Number of Outputs | 4 |
| Switching Frequency | 300 kHz to 2.2 MHz (programmable) |
| Output Current per Channel | 100 mA |
| Dimming Method | PWM |
| Input Voltage Range | 5 V to 24 V (automotive battery range) |
| Automotive Qualification | AEC-Q100 qualified (Q1 suffix) |
| EMI Features | Low-EMI, spread-spectrum capable |
| Package | 20-pin HTSSOP (PWP) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Operating Temperature | -40 °C to +125 °C |
| Output Current Sink Count | 4 |
| Dimming Resolution | High dimming ratio via PWM input |
| Fault Protection | LED open/short detection, thermal shutdown, UVLO |
LP8861QPWPRQ1 Pin Configuration
| Pin 1 | VIN — Input supply voltage (5 V to 24 V) |
| Pin 2 | EN — Enable input (active high) |
| Pin 3 | PWM — PWM dimming input |
| Pin 4 | RT — Frequency-setting resistor |
| Pin 5 | FSET — Frequency-set / synchronization |
| Pin 6 | COMP — Boost/SEPIC compensation network |
| Pin 7 | FB — Boost/SEPIC output voltage feedback |
| Pin 8 | SW — Switch node (boost/SEPIC MOSFET drain) |
| Pin 9 | PGND — Power ground |
| Pin 10 | AGND — Analog ground |
| Pin 11 | ISET — Current-set resistor |
| Pin 12 | SCL — I2C clock (optional configuration) |
| Pin 13 | SDA — I2C data (optional configuration) |
| Pin 14 | FLT — Fault output (open-drain) |
| Pin 15 | OUT1 — Current sink output 1 |
| Pin 16 | OUT2 — Current sink output 2 |
| Pin 17 | OUT3 — Current sink output 3 |
| Pin 18 | OUT4 — Current sink output 4 |
| Pin 19 | VCC — Internal LDO output (decoupling) |
| Pin 20 | VIN_SNS — Input voltage sense / UVLO |
Typical Applications
LP8861QPWPRQ1 is suitable for 6 applications: Automotive Instrument Cluster Backlighting, Heads-Up Display (HUD) Backlight, Infotainment Display Backlight, Automotive Daytime Running Lights (DRL), Rear Combination Lamp (Tail Light) LED Driver, Industrial TFT-LCD Display Backlight.
Automotive Instrument Cluster Backlighting
The LP8861QPWPRQ1 is well suited to automotive instrument cluster backlighting because it provides four synchronously dimmable 100 mA current sinks that match typical cluster LED-string counts. Its programmable 300 kHz to 2.2 MHz switching frequency allows engineers to place the fundamental outside the AM broadcast band, simplifying CISPR 25 EMI compliance. The integrated SEPIC/boost topology accepts the 5 V to 24 V automotive battery rail directly, eliminating a pre-regulator and reducing BOM count. Adaptive output-voltage control minimizes power dissipation across the current sinks, improving efficiency at the cluster's typical 20 to 60 mA per-string drive levels.
Recommended
Heads-Up Display (HUD) Backlight
The LP8861QPWPRQ1's high dimming ratio via PWM input makes it a strong fit for heads-up display backlighting, where daytime/nighttime luminance steps must be precise to avoid driver distraction. Its low-EMI spread-spectrum operation reduces display-coupling noise that can ghost into the projected image. The AEC-Q100 qualification is required for any display electronics mounted near the windshield where temperature swings are significant. Operating from a 12 V nominal automotive rail, the device's adaptive boost/SEPIC converter maintains headroom across cold-crank dips to 5 V without losing regulation.
Recommended
Infotainment Display Backlight
For automotive infotainment displays, the LP8861QPWPRQ1 drives up to four LED strings with synchronized PWM dimming, which avoids flicker artifacts visible on TFT-LCD panels. The wide 300 kHz to 2.2 MHz switching range allows the fundamental to be placed above the AM band, helping the system meet CISPR 25 Class-5 EMI requirements that the device must pass for in-cabin radio coexistence. The exposed-pad package supports continuous high-output-power LED strings typical of 8-inch and larger automotive displays, where thermal dissipation is the limiting factor.
Recommended
Automotive Daytime Running Lights (DRL)
The LP8861QPWPRQ1 drives exterior daytime running light strings with high-precision current regulation that meets automotive photometric requirements. Its AEC-Q100 qualification and 125 °C maximum junction temperature support under-hood thermal environments during summer operation. The SEPIC topology handles input transients from load-dump events up to 35 V without an additional TVS clamp, reducing system cost. Adaptive output voltage minimizes the dissipation across the current sinks when the LED string voltage is below the maximum battery voltage, which is common in DRL designs.
Recommended
Rear Combination Lamp (Tail Light) LED Driver
The LP8861QPWPRQ1 is well suited to rear combination lamp functions including stop, tail, and turn signals where independent channel dimming provides animated lighting effects. Its fault-protection features - LED open/short detection, thermal shutdown, and UVLO - meet automotive reliability requirements for exterior lighting. The 100 mA per channel capacity supports multiple parallel LED strings per channel for high-luminance stop-lamp operation, while PWM dimming allows smooth tail-lamp fade-in/out animations required by modern automotive styling.
Recommended
Industrial TFT-LCD Display Backlight
Beyond automotive, the LP8861QPWPRQ1 is used in industrial HMI panels where its four-channel current regulation and adaptive output voltage deliver high-efficiency backlighting for 5-inch to 12-inch TFT-LCD panels. The wide input range supports 12 V and 24 V industrial supply rails directly, and the AEC-Q100 temperature range (-40 °C to +125 °C) exceeds typical industrial requirements, giving extra margin in outdoor or factory-floor environments. The low-EMI operation simplifies certification for industrial control equipment installed near sensitive RF instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for LP8861QPWPRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LP8861QPWPPRQ1 | LP8863QPWPRQ1 | TPS61196PWPRQ1 | LP8860QPWPRQ1 | LP8865CQPWPRQ1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | HTSSOP-20 (PWP) | HTSSOP-20 (PWP) | HTSSOP-20 (PWP) | HTSSOP-20 (PWP) | HTSSOP-20 (PWP) | HTSSOP-20 (PWP) |
| Number of Channels | 4 | 4 | 4 | 6 | 4 | 6 |
| Output Current per Channel | 100 mA | 100 mA | 100 mA | 200 mA | 100 mA | 100 mA |
| Switching Frequency Range | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz | 100 kHz to 1.2 MHz | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz |
| Automotive Qualification (AEC-Q100) | Yes (Q1) | Yes (Q1) | Yes (Q1) | Yes (Q1) | Yes (Q1) | Yes (Q1) |
| Topology | SEPIC / Boost | SEPIC / Boost | SEPIC / Boost | Boost | SEPIC / Boost | SEPIC / Boost |
Key Differentiators
- Highest switching-frequency ceiling in TI LP886x family (vs TPS61196PWPRQ1)
- Integrated SEPIC topology (single device supports both boost and SEPIC) (vs LP8860QPWPRQ1)
- Adaptive output voltage minimizes dissipation (vs LP8865CQPWPRQ1)
Design Notes
Estimated: at VIN=12 V, VOUT=24 V boost driving 4 × 100 mA LEDs, total output power ≈ 9.6 W and input current ≈ 0.8 A. Assuming 90% converter efficiency, dissipation ≈ 1 W, which on the HTSSOP-20 (PWP) exposed-pad package (~30 °C/W theta_JA on 1 sq-in copper pour) results in a junction-temperature rise of ~30 °C above ambient. A 1 sq-in minimum copper pour under the exposed pad is required; for higher-LED-count designs use 2 to 4 sq-in to keep Tj within the 125 °C automotive limit.
Place the input capacitor (4.7 µF X7R minimum, low-ESR ceramic) within 5 mm of the VIN pin and PGND. Route the SW trace with minimal area and avoid running analog signal traces (FB, COMP, ISET) under the SW node. The exposed thermal pad must be soldered to a continuous ground pour with at least 9 thermal vias (0.3 mm drill) for proper heat dissipation, per the TI datasheet land-pattern recommendations.
Do not exceed the maximum input voltage of 24 V continuous on the rating; use a TVS clamp or load-dump suppressor for 12-V automotive systems with 35-V transient exposure. The PWM input frequency should be between 100 Hz and 25 kHz - frequencies below 100 Hz may cause visible flicker on TFT-LCD displays, while frequencies above 25 kHz can reduce dimming resolution. Avoid using the device in continuous boost mode with VOUT below the sum of LED forward voltages - the adaptive output voltage control must have at least 1.5 V of headroom across the current sinks to function correctly.
To meet CISPR 25 Class-5 EMI, place the boost/SEPIC inductor and input/output capacitors within 5 mm of the IC, minimize the SW-node copper area, and use a shielded inductor. Spread-spectrum dithering (default enabled) typically provides 10 to 15 dB of fundamental-peak reduction. Place a pi-filter (LC) at the VIN pin for additional conducted-emission margin if CISPR 25 Class-5 is required for conducted emissions on the battery line.
Compliance Information
AEC-Q100 qualified per Q1 suffix. RoHS and REACH compliance confirmed by TI product page. Halogen-free per TI packaging materials datasheet.
