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Diodes Incorporated AL8861QMP-13
- Part No.:
- AL8861QMP-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
AL8861QMP-13.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:121,101
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Product details
Overview
AL8861QMP-13 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive buck LED driver IC with integrated 40V NDMOS switch, operating from 4.5V–40V input and delivering up to 1.5A output current in MSOP-8EP package. It uses hysteresis-mode control for fast transient response, supports analog/PWM dimming via single VSET pin, and provides inherent open-circuit and short-circuit LED protection for headlamp and tail lamp applications.
For engineers reviewing the AL8861QMP-13 datasheet, AL8861QMP-13 pinout, AL8861QMP-13 application, or AL8861QMP-13 equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and dimming performance, and real-world automotive lighting design constraints - not generic DC-DC guidance.
Technical Context
The AL8861QMP-13 implements fixed-frequency hysteresis control with internal current-sense threshold of 100mV ±5% referenced to VIN, enabling precise average LED current regulation without external compensation. Its high-side current sensing (via ISENSE–VIN resistor) eliminates ground-loop interference and supports true high-side LED string configurations.
Dimming is implemented through a multi-function VSET pin accepting 0.3–2.5V DC for linear 5–100% current scaling or PWM signals <500Hz for 1–100% duty-cycle control; soft-start time is programmable via external capacitor (1.5ms/nF). The device integrates overtemperature shutdown at +150°C with +30°C hysteresis and features 95% typical efficiency at 16V input/3-LED load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports full automotive battery range including cold-crank (4.5V) and load-dump (40V) |
| Max Output Current | 1.5A - sets maximum LED string current; determined by RS = 0.067Ω (IOUTNOM = 0.1/RS) |
| Switching Frequency | Up to 1MHz - enables compact magnetics; actual fSW varies with VIN, VLED, and L (e.g., 250kHz at VIN=16V, 3 LEDs) |
| Current Sense Accuracy | ±5% typical - ensures stable LED brightness across temperature (-40°C to +125°C ambient) |
| Efficiency | >95% typical - measured at VIN=16V, 3 LEDs, reduces thermal load in confined lamp housings |
| Junction Temp Limit | +150°C with +30°C hysteresis - enables operation in under-hood environments with minimal heatsinking |
| Thermal Resistance θJA | 56°C/W - defined on 2"×2" FR-4 board with 2oz copper and recommended pad layout |
Pinout & Package
AL8861QMP-13 is housed in a thermally enhanced MSOP-8EP (exposed pad) package, with EP connected to GND for improved heat dissipation. Pin 7 is NC; pins 2 and 3 are tied internally to GND; pins 5 and 6 share the LX node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ISENSE | High-side current sense input | Connects to external RS between VIN and ISENSE; sets nominal LED current as IOUTNOM = 0.1/RS |
| 2,3 GND | Power and signal ground reference | Must be low-impedance connection to PCB ground plane; EP must also connect to GND for thermal conduction |
| 4 VSET | Multi-function dimming and enable control | Accepts 0.3–2.5V DC (5–100% current) or PWM signal; ≤0.2V disables output; capacitor to GND extends soft-start |
| 5,6 LX | Drain of internal NDMOS switch | Connects to inductor and freewheeling diode cathode; peak voltage reaches VIN + VLED + VD during off-time |
| 7 N/C | No electrical connection | Must remain unconnected; no routing or solder mask opening required |
| 8 VIN | Main power input | 4.5–40V supply; requires ≥10μF X7R ceramic decoupling capacitor placed adjacent to pin |
| EP | Exposed thermal pad | Electrically GND; must be soldered to large copper pour for θJA = 56°C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic mode control | Eliminates need for external compensation network; provides fast load/transient response without loop instability risk |
| Single-pin dimming & enable | VSET pin supports seamless transition between analog brightness control, PWM dimming, and standby shutdown - reducing system BOM and routing complexity |
| Inherent open-circuit LED protection | Auto-shutdown when LED string opens - prevents LX overvoltage and protects MOSFET without external circuitry |
| Integrated 40V NDMOS switch | RON = 0.2Ω typical - minimizes conduction loss and simplifies layout vs. external FET solutions |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C operation with PPAP support - meets OEM requirements for front lighting modules |
Applications
| Automotive Headlamps | Automotive Tail Lamps |
|---|---|
Use Scenario: High-beam and low-beam LED modules in modern adaptive driving beam (ADB) systems requiring precise current regulation and fast dimming response. IC Role / Device Role / Timing Role: Primary buck controller regulating 1.5A through multi-chip LED arrays; VSET-driven PWM dimming synchronizes with camera-based ADB commands. Use Value: 95% efficiency minimizes thermal stress in sealed headlamp enclosures; ±5% current accuracy ensures consistent lumen output across temperature. | Use Scenario: Stop/tail/turn LED clusters in rear combination lamps where space, reliability, and EMI are critical. IC Role / Device Role / Timing Role: Constant-current source for red LED strings; hysteresis control avoids audible switching noise common in low-frequency PWM drivers. Use Value: Inherent open-circuit protection prevents fault propagation during LED failure; MSOP-8EP footprint enables compact dual-channel layout. |
| Automotive Interior Lighting | Commercial Vehicle Marker Lights |
Use Scenario: Ambient and dome lighting with smooth analog dimming for human-centric lighting profiles. IC Role / Device Role / Timing Role: Buck LED driver with DC voltage-controlled brightness; VSET pin accepts 0.3–2.5V from MCU DAC or potentiometer. Use Value: Linear 5–100% dimming range eliminates flicker; soft-start capacitor (e.g., 1nF → 1.5ms delay) prevents inrush-induced microcontroller reset. | Use Scenario: Side marker and clearance lamps on trucks and buses exposed to wide temperature swings and vibration. IC Role / Device Role / Timing Role: Robust constant-current driver qualified to AEC-Q100 Grade 1; operates continuously at +105°C ambient with no derating. Use Value: Overtemperature shutdown at +150°C junction with +30°C hysteresis ensures fail-safe thermal management; 40V max input withstands alternator transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862QMP-13 | Same pinout and architecture but supports up to 2.0A output current; higher RON (0.25Ω) and slightly lower efficiency at 1.5A | Targeted at higher-power headlamp modules requiring >1.5A; not drop-in for existing AL8861Q designs due to different RS scaling | Select only if output current >1.5A is required; verify thermal margin with θJA = 56°C/W and increased conduction loss |
| LM3409QMYX/NOPB | External MOSFET controller (no integrated switch); requires separate 40V FET; supports adjustable frequency and slope compensation | Suitable for custom high-efficiency or high-reliability designs where discrete FET selection is preferred; lacks integrated protection features | Choose when design flexibility outweighs BOM reduction; adds layout complexity and requires additional protection circuitry |
Compared with AL8861QMP-13, AL8862QMP-13 offers higher current capability at the cost of efficiency and thermal density, while LM3409QMYX/NOPB trades integration for design adaptability - making AL8861QMP-13 optimal for cost-sensitive, space-constrained automotive lamps needing AEC-Q100 compliance and single-chip simplicity.
Availability
AL8861QMP-13 is available at Aetrix Electronics and suitable for automotive headlamps, tail lamps, interior lighting, and commercial vehicle marker lights requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for AL8861QMP-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and AEC-Q100-compliant product lines.
The AL8861QMP-13 belongs to Diodes' automotive LED driver family, designed specifically for robust, high-efficiency constant-current regulation in exterior and interior lighting modules meeting stringent automotive reliability and thermal requirements.
FAQ
What is the minimum input voltage required for AL8861QMP-13 startup?
The AL8861QMP-13 internal regulator starts up at 3.8V (typical), but guaranteed operation begins at VIN ≥ 4.5V per Recommended Operating Conditions. Below 4.5V, the device may not sustain regulation or deliver rated current; cold-crank scenarios must ensure VIN remains ≥4.5V during startup to avoid brownout-induced shutdown.
How does the AL8861QMP-13 handle LED open-circuit faults?
The AL8861QMP-13 detects open-circuit conditions via loss of current-sense voltage at ISENSE and automatically disables the internal switch, clamping LX at VIN and entering low-power standby. No external components are needed - this behavior is inherent to its hysteresis control architecture and current-sense monitoring circuitry.
Can AL8861QMP-13 drive multiple parallel LED strings?
No - AL8861QMP-13 is designed for series-connected LED strings only. Driving parallel strings would cause current imbalance due to forward-voltage mismatches, violating its constant-current regulation principle. For parallel configurations, separate AL8861QMP-13 channels or a matrix driver IC is required.
What is the recommended capacitor value for VSET soft-start?
A 1nF capacitor from VSET to GND adds ~1.5ms to the default 0.1ms soft-start time, yielding total ~1.6ms. This value balances inrush suppression and dimming responsiveness; larger values (e.g., 10nF → 15ms) improve surge immunity but degrade PWM dimming fidelity below 100Hz.
AL8861QMP-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 1.5A
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
AL8861QMP-13 FAQ
1.How can I place an order for AL8861QMP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8861QMP-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 AL8861QMP-13 reliable?
The price and inventory of AL8861QMP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8861QMP-13 is usually 5 days.
3.What payment methods are accepted for AL8861QMP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8861QMP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8861QMP-13?
AL8861QMP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8861QMP-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 AL8861QMP-13?
For technical support, including AL8861QMP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8861QMP-13 requirements.
6.How does Aetrix verify that AL8861QMP-13 is sourced from the original manufacturer or authorized distributors?
All AL8861QMP-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 AL8861QMP-13 meets industry standards.
7.What is the process for return or replacement of AL8861QMP-13?
All AL8861QMP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8861QMP-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 AL8861QMP-13 part is unused and in its original packaging.
Return procedure for AL8861QMP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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