Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.
TSSOP-16EP.pngSynchronous Buck LED Driver
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The AL8891Q is an easy-to-use synchronous step-down DC-DC LED driver with high-side current sense capable of driving up to 2A of constant current from an input voltage ranging from 4.5V to 65V. The AL8891Q provides high switching frequency up to 2.5MHz to optimize high efficiency, allowing a smaller inductor size and compact form factor solution. Pin arrangement allows simple, optimum PCB layout. Constant on time control is employed to achieve simple control-loop compensation and cycle-by-cycle current limiting with fast dynamic response.
Features such as fault flag, PWM and analog dimming, internal soft-start, and shutdown provide a flexible and easy-to-use platform for a wide range of applications. Discontinuous conduction and automatic frequency reduction at light loads improve light-load efficiency.
Protection features include thermal shutdown, VIN and VCC undervoltage lockout, cycle-by-cycle current limit, output open & short-circuit protection for LED, and external components open & short protection.
The AL8891Q device is available in the thermal enhanced TSSOP16EP package.
| AEC Qualified | Yes |
|---|---|
| Compliance (Only Automotive supports PPAP) | Automotive |
| Topologies (Buck) | Yes |
| Topologies (Buck-Boost) | No |
| Topologies (Boost) | No |
| Topologies (Charge Pump) | No |
| Minimum Input Voltage (V) | 4.5 |
| Maximum Input Voltage (V) | 65 |
| Maximum Output Voltage (V) | 64 |
| Maximum LED Current (A) | 2 |
| LED Current Accuracy (%) | 4 |
| Switching Frequency Maximum (kHz) | 2500 |
| Dimming (PWM) | Yes |
| Dimming (Analog) | Yes |
| Efficiency (%) | 97 |
| Operating Temperature Range (°C) | -40 to 125 |
| Sense/Feedback Voltage (mV) | 200 |
| Quiescent Current Typ (mA) | 1 |
| AEC-Q100 Grade | 1 |
