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Diodes Incorporated AL8808WT-7
- Part No.:
- AL8808WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AL8808WT-7.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,632
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Product details
Overview
AL8808WT-7 from Diodes Incorporated is a constant-current buck LED driver IC designed for high-efficiency, low-EMI illumination systems. It delivers up to 1A output current with ±5% accuracy, operates from 6V to 30V input, switches at up to 1MHz, and supports analog/PWM dimming via the CTRL pin - used in MR16 lamps and general illumination where series-connected LEDs require uniform brightness without ballast resistors.
For engineers reviewing the AL8808WT-7 datasheet, AL8808WT-7 pinout, AL8808WT-7 application, or AL8808WT-7 equivalent, this page provides verified technical context, validated pin functions, confirmed dimming behavior (0.4V turn-off threshold, 0.5–2.5V analog control range), and real-world thermal performance (θJA = 209°C/W on FR-4) to support layout, thermal design, and system-level dimming integration.
Technical Context
The AL8808WT-7 implements a current-mode buck topology with internal 1.25A MOSFET switch, fixed-frequency PWM control (up to 1MHz), and fast edge control (tF = 5ns, tR = 7ns) to minimize EMI. Its SET pin sets nominal LED current via external resistor (VTH = 100mV typ), while the CTRL pin accepts both analog voltage (0.5–2.5V) and logic-level PWM (≤500Hz, 0.4V/2.6V thresholds) for precise dimming.
It integrates open-circuit protection and over-temperature shutdown (TOTP = +145°C, hysteresis = +10°C), and features an internal 5V reference (VREF = 2.5V) and 50kΩ pull-up on CTRL. The device requires no external compensation and uses minimal passive components - inductor, Schottky diode, and single sense resistor - enabling compact PCB designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 1A DC, set by external resistor between VIN and SET pins (VTH = 100mV ±5%) |
| Input Voltage Range | 6V to 30V - supports wide-range DC supplies including 12V/24V industrial rails and automotive-derived inputs |
| Switching Frequency | Up to 1MHz - enables use of small inductors (e.g., 33µH–100µH) and reduces solution footprint |
| Dimming Interface | Analog (0.5–2.5V) or PWM (0.4V low / >2.6V high) - direct compatibility with MCU GPIOs and DAC outputs |
| Thermal Resistance | θJA = 209°C/W (TSOT25 on 25mm×25mm 1oz FR-4) - defines derating curve for continuous 1A operation at TA ≤ +85°C |
| Protection Features | Built-in open-circuit detection and over-temperature shutdown (145°C trigger, 10°C hysteresis) - prevents damage during fault conditions |
| Efficiency | Up to 96% - achieved at 12V input, 1A load, 1–7 LEDs, minimizing thermal load in enclosed fixtures |
Pinout & Package
AL8808WT-7 is housed in a thermally enhanced TSOT25 (5-pin thin shrink small outline transistor) package with exposed pad for improved heat dissipation. Pin 1 (SW) is the high-side switch node; Pin 2 (GND) is power ground; Pin 3 (CTRL) serves dual analog/PWM dimming and enable functions; Pin 4 (SET) configures output current; Pin 5 (VIN) supplies input power and powers internal regulator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Node | Connects to inductor and freewheeling diode; track length must be minimized to reduce EMI radiation |
| 2 - GND | Power Ground | Primary return path for switch current and SET resistor; requires low-inductance connection to thermal pad |
| 3 - CTRL | Dimming & Enable Input | Accepts analog voltage (0.5–2.5V) or PWM signal; ≤0.4V disables output; floating = 5V pull-up for full current |
| 4 - SET | Current Sense Reference | Voltage across external resistor (VIN–SET) sets nominal LED current (IOUT = 0.1V / RSET) |
| 5 - VIN | Input Supply | 6–30V input; must be decoupled with ≥2.2µF X7R ceramic capacitor close to pin and GND |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI switching | Controlled 5ns fall time and 7ns rise time minimize high-frequency harmonics, easing EMC compliance |
| High-current capability | 1A continuous output with integrated 0.35Ω RDS(ON) MOSFET eliminates need for external switch |
| Accurate current regulation | ±5% LED current tolerance over line, load, and temperature - ensures consistent luminance across units |
| Flexible dimming architecture | Single-pin CTRL supports both analog and PWM without external circuitry - simplifies MCU interface |
| Robust protection suite | Open-circuit detection and thermal shutdown prevent failure during LED string break or overheating |
Applications
| MR16 Retrofit Lamps | Architectural Accent Lighting |
|---|---|
|
Use Scenario: Replacing halogen MR16 bulbs in 12V AC/DC track lighting systems with constant-current LED modules. IC Role / Device Role / Timing Role: Buck LED driver providing regulated 350mA–1A current to 3–6 series white LEDs, replacing magnetic transformers and resistive droppers. Use Value: Eliminates ballast resistors, achieves >90% efficiency at 12V input, and enables smooth 0–100% PWM dimming compatible with standard wall dimmers. |
Use Scenario: Low-profile linear LED strips mounted in coves, shelves, or signage requiring uniform brightness and minimal thermal footprint. IC Role / Device Role / Timing Role: Constant-current source driving 4–7 series LEDs per channel, synchronized via shared CTRL signal for multi-zone dimming. Use Value: TSOT25 package allows direct PCB mounting behind narrow aluminum extrusions; 1MHz switching permits <2mm board height with 33µH inductors. |
| Industrial Panel Indicators | Commercial Downlight Drivers |
|
Use Scenario: High-reliability status indicators in control panels where LED brightness must remain stable across 6–30V supply variations. IC Role / Device Role / Timing Role: Primary current regulator ensuring ±5% LED current accuracy despite input ripple or temperature drift (−40°C to +125°C junction). Use Value: Built-in over-temperature protection prevents latch-up during extended operation; 2.5kV HBM ESD rating withstands handling in factory environments. |
Use Scenario: Integrated LED driver in 4–12W downlights using 12–24V DC input, targeting UL Class 2 compliance and flicker-free dimming. IC Role / Device Role / Timing Role: Primary buck controller managing 670mA–1A output with analog dimming (0–10V interface via resistor divider) and surge immunity. Use Value: 96% peak efficiency reduces heatsink requirements; open-circuit protection avoids catastrophic failure if one LED fails open in series string. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8860WUTR | Higher max input (40V), 1.2A output, integrated soft-start, but larger SOT26 package and higher quiescent current (550µA vs. 350µA) | Better suited for 36V industrial rails and applications requiring inrush control; less optimal for space-constrained MR16 retrofits | Select AL8860WUTR when input exceeds 30V or soft-start is mandatory; otherwise AL8808WT-7 offers superior EMI performance and smaller footprint. |
| MPQ4425AGU-AEC1-P | Automotive-grade (AEC-Q100), 2.5A output, 2.2MHz switching, but requires external compensation and lacks integrated open-circuit protection | Targeted at automotive interior lighting with stringent qualification; over-specified for commercial lighting with added BOM cost and complexity | Choose MPQ4425AGU-AEC1-P only for AEC-Q100-compliant designs; AL8808WT-7 delivers better cost/performance balance for non-automotive applications. |
Compared with AL8860WUTR and MPQ4425AGU-AEC1-P, the AL8808WT-7 prioritizes low-EMI operation, minimal external component count, and TSOT25 compactness - making it optimal for cost-sensitive, space-constrained general illumination where 30V max input and 1A output meet system requirements.
Availability
AL8808WT-7 is available at Aetrix Electronics and suitable for MR16 retrofit lamps, architectural accent lighting, industrial panel indicators, and commercial downlight drivers requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AL8808WT-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and lighting applications.
The AL8808 belongs to Diodes' LED driver product line, engineered specifically for cost-effective, high-efficiency constant-current DC/DC conversion in general illumination and retrofit lamp designs - emphasizing low EMI, simple layout, and robust protection.
FAQ
What is the minimum input voltage required for AL8808WT-7 to start switching?
The AL8808WT-7 requires VIN ≥ 5.6V to initiate switching (internal regulator startup threshold). Below this, the device remains inactive even if CTRL is asserted. This ensures stable operation after bulk capacitor charging and avoids erratic startup under brown-out conditions.
Can AL8808WT-7 drive more than 8 LEDs in series?
No - the datasheet specifies "up to 8 LEDs" based on maximum output voltage headroom (VIN − VLED_TOTAL ≥ VSW_DROP + VDIODE). At 30V input and typical white LED VF ≈ 3.2V, 8 LEDs consume ~25.6V, leaving ~4.4V for losses. Driving 9+ LEDs risks dropout and regulation loss.
How does the CTRL pin behave when left floating?
When floating, the internal 50kΩ resistor pulls CTRL to ~5V (internal 5V regulator), setting nominal LED current (IOUT = 0.1V / RSET). This state maximizes noise immunity and is the default operational mode - no external pull-up is needed.
Is AL8808WT-7 qualified for automotive applications?
No - AL8808WT-7 is not AEC-Q100 qualified. Diodes states that automotive-grade versions (e.g., AL8808Q) require specific change control, PPAP, and IATF 16949 manufacturing - the WT-7 variant is intended for industrial and commercial lighting only.
AL8808WT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A (Switch)
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
AL8808WT-7 FAQ
1.How can I place an order for AL8808WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8808WT-7 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 AL8808WT-7 reliable?
The price and inventory of AL8808WT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8808WT-7 is usually 5 days.
3.What payment methods are accepted for AL8808WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8808WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8808WT-7?
AL8808WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8808WT-7 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 AL8808WT-7?
For technical support, including AL8808WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8808WT-7 requirements.
6.How does Aetrix verify that AL8808WT-7 is sourced from the original manufacturer or authorized distributors?
All AL8808WT-7 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 AL8808WT-7 meets industry standards.
7.What is the process for return or replacement of AL8808WT-7?
All AL8808WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL8808WT-7, 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 AL8808WT-7 part is unused and in its original packaging.
Return procedure for AL8808WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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