onsemi 3A 3200KHZ Power Management IC FAN5909UCX

The FAN5909UCX is a high-efficiency, low-noise synchronous step-down DC-DC converter designed for powering RF power amplifiers in mobile applications. It supports load currents up to 2.5 A and features an adjustable output voltage range from 0.40 V to 3.60 V, controlled by an analog input voltage. The device operates in PWM mode at a switching frequency of 2.9 MHz and can transition to PFM mode at lower load currents to enhance efficiency. An integrated LDO assist feature is activated under heavy load conditions, ensuring optimal performance even in challenging battery and VSWR scenarios. The FAN5909UCX is packaged in a compact 16-bump WLCSP measuring 1.615 mm x 1.615 mm, requiring only three external components for operation. It also includes protections such as input under-voltage lockout and thermal shutdown, making it suitable for dynamic supply bias applications in GSM, EDGE, and 3G/4G platforms.