MP4689A

The MP4689A is a high-voltage input, step-down, switching regulator that delivers up to 1A of constant current to high-power LEDs. The MP4689A integrates a high-side, high-voltage, power MOSFET with a typical current limit of 3.5A. The wide 4.5V to 100V input range accommodates a variety of step-down applications, making it ideal for automotive, industrial, and general lighting applications. Hysteresis current-mode control is applied for very fast response, which makes the 20kHz dimming frequency possible. MPS’s proprietary feedback control scheme minimizes the number of external components while delivering an LED current with ±3% accuracy. The switching frequency is up to 1MHz, which allows for a small component size. Thermal shutdown and short-circuit protection (SCP) provide reliable and fault-tolerant operations. A 170µA quiescent current allows the MP4689A to be used in battery-powered applications. The MP4689A is available in a SOIC-8 package with an exposed pad.