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Diodes Incorporated AL8891QT16E-13
- Part No.:
- AL8891QT16E-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
AL8891QT16E-13.pdf
- Description:
- LED MV INT SWITCH TSSOP-16EP T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
AL8891QT16E-13 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive synchronous buck LED driver with integrated high-side (200 mΩ) and low-side (130 mΩ) MOSFETs, delivering up to 2 A constant current across 4.5 V–65 V input range and supporting PWM/analog/hybrid dimming with <0.01% resolution. It operates at up to 2.5 MHz switching frequency, enables 99% duty cycle for near-rail output, and integrates fault detection (LED open/short, thermal, UVLO) in a thermally enhanced TSSOP-16EP package.
For engineers reviewing the AL8891QT16E-13 datasheet, AL8891QT16E-13 pinout, AL8891QT16E-13 application, or AL8891QT16E-13 equivalent, key selection considerations include high-side current sense architecture, adaptive constant-on-time control for fast transient response, CISPR25 Class 5 EMI compliance via built-in spread spectrum, and AEC-Q100 qualification for automotive lighting systems requiring robust fault flag signaling and hybrid dimming precision.
Technical Context
The AL8891QT16E-13 employs constant-on-time (COT) adaptive control with internal compensation-no external capacitor required-enabling stable loop response across wide VIN and load ranges while maintaining fixed-frequency operation. Its high-side current sense topology eliminates need for low-side shunt, preserving ground-referenced LED cathode configuration critical for automotive DRL and headlight designs.
Functional integration includes dual MOSFETs with verified RDS(ON) (HS: 200 mΩ typ, LS: 130 mΩ typ), programmable switching frequency (200 kHz–2.5 MHz via FREQ pin resistor), and comprehensive protection: cycle-by-cycle current limiting, LED open/short detection (via CSN threshold monitoring), thermal shutdown with 170°C trip and 20°C hysteresis, and VIN/VCC UVLO with precise thresholds (VIN_UVLO_R = 4.2 V typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports full automotive battery range including cold-crank (4.5 V) and load-dump transients (up to 65 V sustained). |
| Output Current | Up to 2 A constant current - sufficient for multi-LED strings in headlight and fog light modules. |
| Switching Frequency | 200 kHz to 2.5 MHz - adjustable via external resistor on FREQ pin; higher frequencies enable smaller inductors (e.g., 5.6 µH at 2.2 MHz). |
| MOSFET RDS(ON) | HS: 200 mΩ, LS: 130 mΩ - low conduction loss enabling >90% efficiency at 2 A across 12 V–48 V inputs. |
| Duty Cycle Max | 99% - allows VOUT to track closely to VIN, essential for high-VF LED strings in stop/tail lights. |
| Dimming Resolution | <0.01% hybrid dimming - combines analog (20% range) and PWM (0.05%–5% duty) for flicker-free, high-fidelity brightness control. |
| Thermal Resistance | RθJA = 32.2 °C/W - validated on JEDEC 4-layer board; exposed pad improves heat dissipation in compact automotive PCB layouts. |
Pinout & Package
Package: Thermally enhanced TSSOP-16EP with exposed thermal pad connected to PGND for optimal heat sinking and noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,2) | Power ground reference | Low-impedance return path for high-current switch node; must connect directly to PCB ground plane. |
| VIN (3) | Main power input | Supplies high-side MOSFET and internal LDO; requires local ceramic decoupling (≥1 µF) to PGND. |
| EN (4) | Enable & VIN UVLO input | Controls startup/shutdown; rising threshold 2.2 V enables regulator; also accepts PWM signal for dimming. |
| PDIM (5) | PWM dimming input | Dedicated logic-level PWM interface; 1.5 V rising threshold ensures noise immunity in automotive environments. |
| FDSET (6) | LED open-fault masking threshold | Configures VIN-rising condition to suppress false open-fault reporting during power-up transients. |
| ADIM (7) | Analog dimming voltage input | 0.15–2.0 V analog control range; clamped at 15 mV minimum to prevent zero-current dropout. |
| FREQ (8) | Switching frequency set | Resistor-to-AGND sets fSW; 237 kΩ yields 400 kHz, 43 kΩ yields 2.1 MHz. |
| CSP / CSN (9,10) | High-side current sense inputs | Differential sensing across external RCS; 200 mV typical sense voltage enables accurate 2 A regulation. |
| AGND (11) | Analog ground reference | Separate ground for sensitive analog circuitry; must tie to exposed pad and PGND at single point. |
| VCC (12) | Internal LDO output | 5.0 V ±0.6 V regulated supply; requires 1–4.7 µF ceramic capacitor to PGND for stability. |
| FAULT (13) | Open-drain fault indicator | Asserts low on thermal, LED open/short, or UVLO faults; requires external pull-up for system-level monitoring. |
| NC (14) | No connection | Internally unconnected; must remain floating per datasheet. |
| CBOOT (15) | Bootstrap supply for HS gate driver | Connects 100 nF ceramic capacitor to SW; enables full enhancement of high-side MOSFET. |
| SW (16) | Switch node | Drives external inductor; high dV/dt node requiring tight layout and minimized trace length. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation with PPAP capability and IATF16949 manufacturing. |
| CISPR25 Class 5 EMI compliance | Built-in frequency spread spectrum reduces peak emissions without external filtering components. |
| Internal compensation | No external compensation capacitor required-simplifies BOM and layout while ensuring stability across temperature and line/load. |
| Hybrid dimming resolution | <0.01% combined analog+PWM resolution enables smooth, imperceptible brightness transitions in adaptive lighting. |
| LED open/short protection | Dual-threshold CSN monitoring (1.6 V rise / 1.0 V fall) detects open and short conditions independently with deglitch timing. |
| Thermal auto-restart | 170°C shutdown with 20°C hysteresis and automatic recovery after cooldown-prevents latch-up in enclosed headlamp housings. |
Applications
| Headlights | Daytime Running Lights (DRL) |
|---|---|
|
Use Scenario: High-brightness forward lighting in passenger vehicles with dynamic beam shaping and adaptive driving beam (ADB) requirements. IC Role / Device Role / Timing Role: Primary constant-current LED driver controlling high-power white LED arrays; regulates current independent of forward voltage drift over temperature. Use Value: 99% duty cycle enables full utilization of 12 V–48 V vehicle bus; 2.5 MHz operation permits ultra-compact inductor placement near optics. |
Use Scenario: Always-on, daylight-visible illumination meeting EU ECE R87 photometric standards. IC Role / Device Role / Timing Role: Synchronous buck controller with hybrid dimming for precise luminance control under varying ambient light and battery voltage. Use Value: <0.01% dimming resolution prevents visible stepping; AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime. |
| Fog Lights | Turn/Stop Lights |
|
Use Scenario: High-output auxiliary lighting for low-visibility conditions with thermal constraints due to sealed housing. IC Role / Device Role / Timing Role: Integrated MOSFET driver with thermal shutdown and auto-restart for safe operation in confined thermal envelopes. Use Value: RθJA = 32.2 °C/W and exposed pad mounting enable 2 A output without external heatsink in IP67-rated enclosures. |
Use Scenario: Fast-response rear lighting with sequential turn indication and brake light intensity modulation. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with FAULT pin signaling and cycle-by-cycle current limiting for safety-critical signaling. Use Value: LED open/short detection with 80 µs deglitch and 320 µs mask release ensures no false fault latching during rapid PWM transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8860Q-13 | Lacks integrated low-side MOSFET; requires external synchronous rectifier; max 1.5 A output; no hybrid dimming. | Suitable for cost-sensitive non-AEC-Q100 interior lighting where thermal margin is higher. | Select when lower current (≤1.5 A) and simplified BOM outweigh need for integrated LS FET and advanced dimming. |
| LM3409QMYX/NOPB | External MOSFET controller only; no integrated FETs; supports higher VIN (75 V); no built-in spread spectrum. | Used in industrial LED drivers where layout flexibility and external FET selection are prioritized over compactness. | Choose when design requires >2 A output, custom FET optimization, or operation beyond 65 V input. |
Compared with AL8860Q-13, the AL8891QT16E-13 delivers higher current, integrated dual-FET architecture, and hybrid dimming-reducing component count and improving dimming fidelity. Versus LM3409QMYX/NOPB, it trades external FET flexibility for smaller solution size, lower EMI, and automotive qualification-ideal for space-constrained, safety-certified lighting modules.
Availability
AL8891QT16E-13 is available at Aetrix Electronics and suitable for automotive headlight systems, daytime running lights (DRL), and fog light modules requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for AL8891QT16E-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 solutions, with ISO/TS 16949-certified manufacturing and broad automotive qualification coverage.
The AL8891QT16E-13 belongs to Diodes' AL88xxQ automotive LED driver product line, engineered specifically for high-reliability exterior lighting applications demanding AEC-Q100 Grade 1 performance, EMI robustness, and functional safety-aware fault reporting.
FAQ
What is the maximum allowable input voltage for continuous operation?
The AL8891QT16E-13 supports continuous operation up to 65 V on the VIN pin, with absolute maximum rating of +72 V for transient conditions such as load dump. Operation above 65 V violates recommended operating conditions and may trigger VIN UVLO or cause reliability degradation.
How does the FDSET pin function during LED string power-up?
The FDSET pin configures a VIN-rising threshold to mask LED open-fault reporting during initial power application. When VIN rises above the FDSET-set threshold before the LED string is fully biased, the device suppresses false open-fault assertion-critical for reliable startup in multi-string DRL systems.
Can the AL8891QT16E-13 drive LEDs with forward voltages exceeding 60 V?
No. While the VIN range extends to 65 V, the maximum output voltage (VOUT) is limited by the 99% duty cycle and internal regulation architecture. With VIN = 65 V, VOUT ≤ 64.4 V; however, practical LED string voltage is constrained by thermal limits and efficiency drop at high VF. For >60 V strings, verify thermal derating using RθJA = 32.2 °C/W and junction temperature <150°C.
Is external compensation required for stable operation?
No. The AL8891QT16E-13 uses internal compensation with constant-on-time control, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces component count, and ensures loop stability across all operating conditions without tuning.
AL8891QT16E-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 Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- 1V ~ 65V
- Current - Output / Channel:
- 2A
- Frequency:
- 200kHz ~ 2.5MHz
- Dimming:
- Analog, PWM
- Applications:
- Automotive
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
AL8891QT16E-13 FAQ
1.How can I place an order for AL8891QT16E-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8891QT16E-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 AL8891QT16E-13 reliable?
The price and inventory of AL8891QT16E-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8891QT16E-13 is usually 5 days.
3.What payment methods are accepted for AL8891QT16E-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8891QT16E-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8891QT16E-13?
AL8891QT16E-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8891QT16E-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 AL8891QT16E-13?
For technical support, including AL8891QT16E-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8891QT16E-13 requirements.
6.How does Aetrix verify that AL8891QT16E-13 is sourced from the original manufacturer or authorized distributors?
All AL8891QT16E-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 AL8891QT16E-13 meets industry standards.
7.What is the process for return or replacement of AL8891QT16E-13?
All AL8891QT16E-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8891QT16E-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 AL8891QT16E-13 part is unused and in its original packaging.
Return procedure for AL8891QT16E-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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