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Diodes Incorporated AL8866QSP-13
- Part No.:
- AL8866QSP-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AL8866QSP-13.pdf
- Description:
- LED MV INT SWITCH SO-8EP T&R 2.5
- Quantity:
- Payment:
- Shipping:
Inventory:4,026
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Product details
Overview
AL8866QSP-13 from Diodes Incorporated is an AEC-Q100 Grade 1 qualified buck-boost/boost/buck/sepic LED controller IC for automotive front lighting, featuring fixed 400 kHz switching frequency, 4.7–85 V input range, analog/PWM dimming (100:1), and integrated fault reporting via open-drain FLT pin.
For engineers reviewing the AL8866QSP-13 datasheet, AL8866QSP-13 pinout, AL8866QSP-13 application, or AL8866QSP-13 equivalent, this device supports topology-flexible high-power LED driver design with spread-spectrum EMI reduction, thermal shutdown, and cycle-by-cycle overcurrent protection in automotive-grade SO-8EP packaging.
Technical Context
The AL8866QSP-13 implements fixed-frequency peak current-mode control with ±12% spread-spectrum dither at 400 Hz to suppress EMI emissions. Its transconductance error amplifier (105 µA/V typ.) regulates LED current via CSP-VIN differential sensing across 4.7–85 V common-mode range.
It supports four topologies-buck, boost, buck-boost, and SEPIC-using external N-channel MOSFETs driven by a 10 Ω typical low-side gate driver (DRV). Protection includes OVP/UVP on OVP pin, cycle-by-cycle OCP via CS pin, and thermal shutdown at +170°C with +25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, boost, buck-boost, and SEPIC configurations enabled via external MOSFET and passive component selection. |
| Input Voltage Range | 4.7 V to 85 V - accommodates full automotive battery range including cold-crank and load-dump transients. |
| Switching Frequency | 400 kHz nominal (±12% dither) - balances efficiency, EMI, and magnetics size for automotive LED drivers. |
| Analog Dimming Range | 1%–100% with ±3% accuracy at 100% level - enables precise brightness control using DC voltage on DIM pin (0.3–2.5 V). |
| PWM Dimming Ratio | 100:1 at 200 Hz - achieves high-resolution digital dimming without visible flicker above 3% duty cycle. |
| Fault Reporting | Open-drain FLT pin asserts low for OVP, UVP, LED open/short, OCP, diode/inductor short/open, and thermal shutdown. |
| Thermal Rating | AEC-Q100 Grade 1 (−40°C to +125°C ambient) - validated for under-hood automotive lighting environments. |
Pinout & Package
AL8866QSP-13 is packaged in enhanced thermal SO-8EP (exposed pad grounded) with 8 pins and GND-connected EP for optimal power dissipation in high-current LED driver applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 4.7–85 V supply; requires ≥1 µF X7R ceramic decoupling capacitor placed adjacent to pin. |
| CSP (Pin 2) | Current sense positive input | Connects to high-side of LED sense resistor; enables accurate LED current regulation over full input range. |
| FLT (Pin 3) | Fault status output | Open-drain active-low signal; requires external pull-up for system-level fault detection and shutdown coordination. |
| OVP (Pin 4) | Output voltage protection input | Monitors LED string voltage via resistive divider to trigger overvoltage (2.0 V threshold) or undervoltage (200 mV threshold) protection. |
| DIM (Pin 5) | Multi-function dimming/control | Supports analog dimming (0.3–2.5 V), PWM dimming (0.2 V low / >2.6 V high), and enable/disable (≤0.2 V for ≥30 ms). |
| COMP (Pin 6) | Error amplifier compensation | Output of transconductance amplifier; connects to RC network to stabilize loop response for all topologies. |
| CS (Pin 7) | Cycle-by-cycle current limit | Sense input for MOSFET switch current; sets peak current limit (500 mV threshold) and accepts slope compensation resistor. |
| DRV (Pin 8) | N-MOSFET gate driver | Drives external high-side N-channel switch with 40 ns typical rise/fall time and 10 Ω low-side resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum EMI reduction | ±12% frequency dither at 400 Hz lowers peak radiated emissions without compromising regulation stability. |
| Topology flexibility | Single IC supports buck, boost, buck-boost, and SEPIC - reduces BOM count and simplifies platform reuse across lighting zones. |
| High-accuracy analog dimming | ±3% LED current accuracy at full scale ensures consistent luminance across vehicle fleet and lifetime. |
| Integrated protection suite | Seven fault modes (OVP, UVP, OCP, thermal, diode/inductor short/open) reported via single FLT pin for simplified system monitoring. |
| Automotive qualification | AEC-Q100 Grade 1, PPAP-capable, IATF 16949 manufacturing - meets OEM requirements for front lighting safety and reliability. |
Applications
| Automotive Front Lighting | Automotive Daytime Running Lights (DRL) |
|---|---|
Use Scenario: High-intensity headlamp module driving 12–27 series LEDs in adaptive driving beam (ADB) systems. IC Role / Device Role / Timing Role: Primary constant-current LED controller managing buck-boost topology to maintain stable 1 A output despite 6–16 V battery variation and thermal drift. Use Value: Enables compliance with ECE R149 photometric standards through <±3% current accuracy and fast transient response (<10 µs). | Use Scenario: Compact DRL module mounted in bumper or grille, operating continuously during daylight hours. IC Role / Device Role / Timing Role: Boost-mode LED driver powering 6–10 white LEDs from 12 V battery with analog dimming for ambient light adaptation. Use Value: Delivers >90% efficiency at 12 V input and supports seamless 1–100% brightness ramping via 0.3–2.5 V DIM voltage sweep. |
| Automotive Fog Lights | Automotive Turn Signal Modules |
Use Scenario: High-output fog lamp assembly requiring robust operation under condensation, vibration, and wide temperature swings. IC Role / Device Role / Timing Role: Buck-boost controller with thermal shutdown and OVP protection ensuring safe operation during prolonged use at −40°C to +125°C ambient. Use Value: Eliminates need for discrete thermal cutoffs or voltage clamps - reduces system cost and improves MTBF by 35% vs legacy solutions. | Use Scenario: Dynamic turn signal with sequential amber LED activation requiring precise current matching across multiple strings. IC Role / Device Role / Timing Role: SEPIC-based controller enabling bidirectional current flow and independent dimming per LED segment via PWM input. Use Value: Achieves <1% inter-string current mismatch and supports 200 Hz PWM dimming with no perceptible flicker at 5% duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8863QSP-13 | Fixed 2.2 MHz switching frequency; no spread spectrum; supports only boost and SEPIC topologies. | Limited to lower-power DRLs and interior lighting due to higher switching losses and reduced thermal margin. | Select when board space is constrained and EMI filtering is handled externally; not suitable for front lighting with stringent CISPR 25 Class 5 limits. |
| LM3409QMYX/NOPB | Adjustable 100–1000 kHz frequency; no integrated OVP/UVP; requires external comparator for fault detection. | Needs additional components for automotive-grade protection, increasing BOM count and validation effort. | Choose only for non-AEC-Q100 designs where cost sensitivity outweighs functional safety requirements. |
Compared with AL8866QSP-13, AL8863QSP-13 trades EMI performance and topology flexibility for higher frequency miniaturization, while LM3409QMYX/NOPB lacks integrated protection and automotive qualification - making AL8866QSP-13 the only single-chip solution meeting OEM front-lighting requirements out-of-box.
Availability
AL8866QSP-13 is available at Aetrix Electronics and suitable for automotive front lighting, daytime running lights, and fog light systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for AL8866QSP-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and automotive-qualified components.
The AL8866QSP-13 belongs to Diodes' AEC-Q100-qualified LED controller product line, engineered specifically for high-brightness automotive exterior lighting with emphasis on EMI robustness, topology adaptability, and functional safety readiness.
FAQ
What topologies does AL8866QSP-13 support and how is configuration achieved?
The AL8866QSP-13 supports buck, boost, buck-boost, and SEPIC topologies through external passive component selection - no internal configuration bits or pins. Topology is determined solely by circuit layout: boost uses inductor between VIN and switch node; buck places inductor between switch node and LED cathode; buck-boost and SEPIC require coupled inductors or transformer windings. All share identical IC pin connections and control loop architecture.
How does the spread-spectrum function interact with analog dimming?
Spread-spectrum modulation is automatically disabled when DIM pin voltage falls below 1.0 V and re-enabled when voltage exceeds 1.1 V. During analog dimming (0.3–2.5 V), spread spectrum remains active above 1.1 V - preserving EMI benefits across 45–100% brightness. Below 1.0 V, the device operates at fixed 360 kHz to ensure stable regulation during deep dimming or standby.
What is the role of the PWMO pin and why is it absent in AL8866QSP-13?
PWMO is a dedicated PMOS gate driver output for synchronized PWM dimming, present only in the U-DFN3030-10 package variant (AL8866QFN-7). The SO-8EP package (AL8866QSP-13) omits PWMO; PWM dimming is implemented directly via the DIM pin, which toggles the main switching regulator - requiring external PMOS or NMOS dimming FET controlled separately.
Can AL8866QSP-13 drive multiple independent LED strings?
No - AL8866QSP-13 regulates current in a single LED string only. It features one current-sense amplifier (CSP/VIN) and one error amplifier (COMP), designed for single-string architectures. Driving multiple strings requires either parallel ICs with master-slave synchronization (not supported natively) or external current-mirror circuits, which compromise accuracy and add complexity. For multi-string systems, Diodes recommends AL8861Q or AL8862Q variants.
AL8866QSP-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.7V
- Voltage - Supply (Max):
- 85V
- Voltage - Output:
- 20V
- Current - Output / Channel:
- -
- Frequency:
- 400kHz
- Dimming:
- Analog, PWM
- Applications:
- Automotive
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AL8866QSP-13 FAQ
1.How can I place an order for AL8866QSP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8866QSP-13 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 AL8866QSP-13 reliable?
The price and inventory of AL8866QSP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8866QSP-13 is usually 5 days.
3.What payment methods are accepted for AL8866QSP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8866QSP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8866QSP-13?
AL8866QSP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8866QSP-13 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 AL8866QSP-13?
For technical support, including AL8866QSP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8866QSP-13 requirements.
6.How does Aetrix verify that AL8866QSP-13 is sourced from the original manufacturer or authorized distributors?
All AL8866QSP-13 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 AL8866QSP-13 meets industry standards.
7.What is the process for return or replacement of AL8866QSP-13?
All AL8866QSP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8866QSP-13, 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 AL8866QSP-13 part is unused and in its original packaging.
Return procedure for AL8866QSP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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