Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.
DFN3030-10.png
Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.
SO-8EP-package-image.pngBuck-Boost, Boost, Buck and SEPIC LED Controller
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The AL8866 is a Buck-Boost, Boost, Buck, and SEPIC (single-ended primary-inductance converter) DC-switching controller designed to drive an external MOSFET for high-power LED applications. The AL8866 operates within a wide input power supply range from 4.7V to 85V.
Based on a fixed-frequency, peak current-mode control architecture, the device incorporates spread spectrum frequency modulation and achieves low EMI performance.
The AL8866 modulates LED currents with analog or PWM dimming techniques. The analog dimming response, over a 100:1 linear range, is obtained by varying the voltage at the DIM pin. PWM dimming is achieved by directly modulating the same DIM pin with the desired duty cycle.
It also integrates a soft-start function, which limits the current through the inductor and external power switch during start up. The inductor and switch current is gradually increased to minimize potential overvoltage and overcurrent at the output.
The AL8866, with an open-drain fault output, indicates when protection conditions trigger, such as LED output overvoltage, LED output open/short, cycle-by-cycle overcurrent protection, sense resistor and inductor/diode short, diode open, and thermal shutdown.
The AL8866 is available in the enhanced thermal SO-8EP and U-DFN3030-10 packages.
| AEC Qualified | No |
|---|---|
| Compliance (Only Automotive supports PPAP) | Standard |
| Topologies (Buck) | Yes |
| Topologies (Buck-Boost) | Yes |
| Topologies (Boost) | Yes |
| Topologies (Charge Pump) | No |
| Minimum Input Voltage (V) | 4.7 |
| Maximum Input Voltage (V) | 85 |
| Maximum Output Voltage (V) | 85 |
| Maximum LED Current (A) | External MOSFET |
| LED Current Accuracy (%) | ±3 |
| Switching Frequency Maximum (kHz) | 400 |
| Dimming (PWM) | Yes |
| Dimming (Analog) | Yes |
| Efficiency (%) | 93 |
| Operating Temperature Range (°C) | -40 to 105 |
| Sense/Feedback Voltage (mV) | 200 |
| Quiescent Current Typ (mA) | 1.8 |
| AEC-Q100 Grade | No |
