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Diodes Incorporated AL8871QT16E-13
- Part No.:
- AL8871QT16E-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
AL8871QT16E-13.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
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Product details
Overview
AL8871QT16E-13 from Diodes Incorporated is an AEC-Q100 Grade 1 qualified buck-boost LED controller IC designed to drive external NMOS transistors for high-current series-connected LED strings. It supports 5V–60V input, delivers ±0.25% VSENSE accuracy, enables 1000:1 PWM dimming at 500 Hz, and integrates dual-fault reporting via FAULT (open-drain flag) and STATUS (analog voltage-coded fault/warning). Used in automotive headlamps and DRLs requiring thermal current derating and robust overtemperature/overcurrent protection.
For engineers reviewing the AL8871QT16E-13 datasheet, AL8871QT16E-13 pinout, AL8871QT16E-13 application, or AL8871QT16E-13 equivalent, key selection criteria include its 60V input capability, TCTRL-enabled LED thermal current control, 1MHz max switching frequency, and thermally enhanced TSSOP-16EP package with exposed paddle for automotive-grade thermal management.
Technical Context
The AL8871QT16E-13 implements a modified hysteretic control architecture with fast current monitoring and accurate current sensing (±0.25% VSENSE threshold), enabling stable LED current regulation across wide input (5V–60V) and output voltage ranges. Its dual-loop design separates analog dimming (via CTRL pin, 10%–100%) from high-frequency PWM dimming (100–500 Hz).
Fault handling is implemented through two dedicated pins: FAULT provides open-drain flag assertion on overtemperature (>150°C), overcurrent (VSENSE > 375 mV), or undervoltage; STATUS outputs graded analog voltages (0.6–4.5 V) to distinguish between normal operation, out-of-regulation, stall, and thermal shutdown conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost LED controller with external NMOS switch - supports wide VIN-to-VLED ratio without topology reconfiguration. |
| Input Voltage Range | 5V to 60V - operates down to 5.0V with reduced performance; requires bootstrap network below 8V for stable gate drive. |
| VSENSE Accuracy | ±0.25% nominal threshold - ensures precise LED current regulation independent of duty cycle variation. |
| PWM Dimming | 1000:1 resolution at 500 Hz - enables flicker-free, high-contrast brightness control in automotive lighting. |
| Thermal Protection | 150°C shutdown / 125°C restart - hysteresis prevents oscillation during thermal stress in enclosed lamp housings. |
| NTC Interface | VNTCH = 625 mV (typ), VNTCL = 440 mV (typ) - enables programmable LED current derating above user-defined junction temperature. |
| Switching Frequency | 300–1000 kHz - adjustable via external components; typical 400 kHz operation balances EMI and efficiency. |
Pinout & Package
Package: Thermally enhanced TSSOP-16EP with exposed paddle (EP), RoHS-compliant, lead-free, halogen- and antimony-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (1) | Analog dimming input | DC voltage (0.125–1.25 V) sets LED current from 10% to 100%; internal clamp limits to <3 V for overvoltage protection. |
| REF (2) | 1.25 V reference output | Stable internal reference used for setting current sense gain and biasing NTC network; supplies ≤1 mA load. |
| NTC (3) | Thermal compensation input | Accepts thermistor divider to reduce LED current above preset temperature; disabled when tied to REF. |
| COMP (4) | Loop compensation node | Connects 330 pF capacitor to SGND to stabilize feedback loop; critical for transient response and stability. |
| STATUS (5) | Analog fault status output | Outputs graded voltage (0.6–4.5 V) indicating specific faults: 0.9 V = overcurrent + out-of-regulation; 1.8 V = overtemperature. |
| SGND (6) | Signal ground reference | Low-noise return path for REF, CTRL, NTC, COMP; must be separated from PGND except at single-point connection. |
| PGND (7) | Power ground return | High-current return for CS, DRV, BST; connects directly to EP pad and PCB ground plane for thermal conduction. |
| N/C (8, 9) | No-connect terminals | Internally unconnected; recommended to tie Pin 8 to PGND and Pin 9 to DRV for thermal and gate-drive routing optimization. |
| DRV (10) | External NMOS gate driver | 11 V (typ) high-side output capable of ±300 mA peak current; clamped to 15 V when BST >12 V. |
| BST (11) | Bootstrap supply input | Drives internal gate driver; connect to VIN if VIN >8 V; use external 8–15 V supply if VIN >24 V to reduce dissipation. |
| VIN (12) | Main input supply | 5–60 V DC input; decoupled with local ceramic capacitor; UVLO triggers at 4.5 V (falling) / 4.9 V (rising). |
| CS (13) | Current sense monitor | Differential input measuring voltage across external sense resistor (VIN–CS); nominal VSENSE = 225 mV. |
| FAULT (14) | Open-drain fault flag | Asserts low on overtemperature, overcurrent, UVLO, or stall; pulled high externally for system-level interrupt signaling. |
| PWM (15) | Digital dimming input | Accepts 3.3 V/5 V logic; enters standby after 15 ms low pulse; min frequency 100 Hz for full 1000:1 resolution. |
| GI (16) | Gain setting input | Sets internal gain ratio (0.20–0.50 × VCTRL) to compensate for duty-cycle-dependent feedback error; clamp-limited to <3 V. |
| EP | Exposed thermal paddle | Must be soldered to solid copper ground plane for electrical safety and thermal dissipation (θJA = 50 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures (−40°C to +125°C junction), PPAP-capable, manufactured in IATF 16949 facilities. |
| Two-pin fault diagnostics | FAULT pin gives binary fault alert; STATUS pin delivers analog-coded voltage for root-cause identification without additional ADC. |
| Thermal LED current control (TCTRL) | NTC input enables linear current reduction above user-defined temperature threshold-critical for LED lifetime preservation in sealed headlamps. |
| 1 MHz max switching frequency | Enables compact magnetics and low-profile designs while maintaining >90% efficiency at 8-LED strings with 33 µH inductor. |
| 1000:1 PWM dimming at 500 Hz | Meets automotive Class B EMI requirements while delivering smooth, imperceptible brightness transitions in DRL and adaptive lighting. |
Applications
| Automotive Daytime Running Lights | Automotive Head Lamps |
|---|---|
|
Use Scenario: Constant-current LED string operation in front-end lighting modules under varying battery voltage (9–16 V) and ambient temperature (−40°C to +85°C). IC Role / Device Role / Timing Role: Buck-boost LED controller regulating current through 6–12 series LEDs using external NMOS switch and inductive energy transfer. Use Value: Maintains ±2% LED current accuracy across input voltage dips and thermal drift, ensuring consistent luminous intensity per regulatory compliance (ECE R87). |
Use Scenario: High-brightness adaptive driving beam (ADB) modules requiring dynamic current scaling and fault-safe shutdown. IC Role / Device Role / Timing Role: Primary LED current controller with integrated thermal derating and dual-fault reporting for ASIL-B–aligned systems. Use Value: Enables real-time thermal current rollback via NTC input and immediate fault isolation via STATUS voltage coding-reducing need for external monitoring ICs. |
| Automotive Fog Lamps | Automotive Interior Lamps |
|
Use Scenario: High-current fog lamp arrays operating in humid, vibration-prone environments with wide input transients (load dump up to 60 V). IC Role / Device Role / Timing Role: Robust buck-boost controller managing up to 15-series LEDs with overvoltage tolerance and thermal foldback. Use Value: Withstands 65 V absolute max input and includes undervoltage lockout (4.5 V), preventing erratic behavior during cold-cranking events. |
Use Scenario: Ambient lighting systems requiring smooth dimming, low EMI, and long-term reliability in cabin environments. IC Role / Device Role / Timing Role: LED current regulator supporting both analog (CTRL) and high-frequency PWM dimming for glare-free human-centric lighting. Use Value: Delivers 1000:1 dimming range at 500 Hz-eliminating visible flicker while meeting CISPR-25 Class 5 conducted EMI limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862Q-13 | Single-stage buck-only topology; 40 V max input; no STATUS analog fault coding; only FAULT flag output. | Limited to lower-voltage LED strings (<10 LEDs); lacks thermal derating and multi-level fault diagnosis required for headlamp systems. | Select only for cost-sensitive, non-automotive interior lighting where input stays <40 V and thermal management is passive. |
| LM3409QMY/NOPB | Adjustable-frequency buck controller; 60 V input; no integrated NTC interface; uses external op-amp for thermal control. | Requires additional components for thermal dimming and fault reporting; not AEC-Q100 qualified; higher BOM count. | Choose when existing designs already use LM3409-based layouts and AEC-Q100 is not mandatory; avoid for new automotive programs. |
Compared with AL8871QT16E-13, AL8862Q-13 sacrifices topology flexibility and fault visibility for lower cost, while LM3409QMY/NOPB trades integration for configurability-neither matches the AL8871QT16E-13's combined AEC-Q100 Grade 1 qualification, analog fault coding, and embedded thermal current control in a single TSSOP-16EP package.
Availability
AL8871QT16E-13 is available at Aetrix Electronics and suitable for automotive daytime running lights, headlamps, fog lamps, and interior lighting systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for AL8871QT16E-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 ICs, specializing in power management, signal integrity, and automotive-qualified solutions with IATF 16949 certified facilities.
The AL8871Q belongs to Diodes' automotive LED controller product line, engineered specifically for high-reliability exterior and interior lighting applications demanding AEC-Q100 Grade 1 operation, thermal current control, and dual-fault diagnostics.
FAQ
What is the minimum input voltage required for AL8871QT16E-13 startup?
The AL8871QT16E-13 starts up when VIN or VBST rises above 4.9 V (UVLO+ threshold). It continues functional operation down to 5.0 V, though performance degrades below 8 V-requiring a bootstrap circuit on BST to maintain gate drive strength and current regulation accuracy.
How does the GI pin affect LED current accuracy?
The GI pin sets the internal gain ratio (0.20–0.50 × VCTRL) to compensate for duty-cycle-induced errors in the current-sense feedback loop. Proper GI-to-CTRL resistive divider calibration ensures ±0.25% VSENSE accuracy across all operating conditions, especially in boost-heavy configurations.
Can AL8871QT16E-13 drive more than 15 LEDs in series?
No-the datasheet specifies "drive in excess of 15 LEDs in series" only under optimal conditions (e.g., 60 V input, low forward voltage LEDs, minimal voltage drops). At 3.2 V/LED, 15 LEDs require 48 V; adding margin for diode drop and ripple leaves insufficient headroom above 60 V. Practical limit is 15 LEDs at nominal conditions.
What is the purpose of the dual-fault reporting (FAULT and STATUS pins)?
FAULT provides a simple open-drain interrupt for microcontroller polling or hardware reset triggering. STATUS delivers analog voltage levels (0.6–4.5 V) that encode specific fault types-e.g., 1.8 V = overtemperature, 0.9 V = overcurrent + out-of-regulation-enabling precise diagnostics without external ADC or firmware overhead.
AL8871QT16E-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 60V
- Current - Output / Channel:
- -
- Frequency:
- 300kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
AL8871QT16E-13 FAQ
1.How can I place an order for AL8871QT16E-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8871QT16E-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 AL8871QT16E-13 reliable?
The price and inventory of AL8871QT16E-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8871QT16E-13 is usually 5 days.
3.What payment methods are accepted for AL8871QT16E-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8871QT16E-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8871QT16E-13?
AL8871QT16E-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8871QT16E-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 AL8871QT16E-13?
For technical support, including AL8871QT16E-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8871QT16E-13 requirements.
6.How does Aetrix verify that AL8871QT16E-13 is sourced from the original manufacturer or authorized distributors?
All AL8871QT16E-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 AL8871QT16E-13 meets industry standards.
7.What is the process for return or replacement of AL8871QT16E-13?
All AL8871QT16E-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8871QT16E-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 AL8871QT16E-13 part is unused and in its original packaging.
Return procedure for AL8871QT16E-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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