UP9021P UP9021PDDA Synchronous Buck Converter IC

The UP9021P (also marked UP9021PDDA) is a monolithic synchronous buck DC-DC converter IC designed for efficient and reliable voltage step-down applications. It is widely used in laptops, tablets, embedded systems, and consumer electronics where compact size, high efficiency, and stable power delivery are essential.

This IC integrates high-side and low-side MOSFETs, reducing external component count and improving overall efficiency. The UP9021P is commonly found in system and auxiliary power rails and is frequently replaced during repairs involving no power, unstable voltage, or device not booting issues.

• Monolithic synchronous buck (step-down) DC-DC converter

• Designed for high-efficiency power conversion

• Integrated high-side and low-side MOSFETs

• Suitable for laptop, tablet, and embedded applications

• Stable output under varying load conditions

• Compact surface-mount package for space-saving PCB layouts

• Built-in protection features for reliable operation

• Ideal for system and auxiliary power rails