SY8089 PDF Datasheet – 5.5V, 2A, Step Down Regulator

A step-down regulator, also known as a buck regulator, is a type of voltage regulator used in electronics to efficiently convert a higher input voltage to a lower output voltage. It’s a fundamental component in power management systems, ensuring that devices receive a stable and appropriate voltage level for their operation.

Part Number: SY8089, SY8089AAC, SY8089AAAC

Function: 5.5V, 2A, Synchronous Step Down Regulator

Package: SOT23-5 Type

Manufacturer: Silergy

Images:SY8089 datasheet


The SY8089 and SY8089A are high-efficiency, high frequency synchronous step-down DC-DC regulator IC capable of delivering up to 2A output current. The devices operate over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than 1MHz switching frequency. […]


• Low RDS(ON) for internal switches (top/bottom):110mΩ/80mΩ

• 2.7-5.5V input voltage range

• 2A continuous, 3A peak load current capability

• 1MHz switching frequency minimizes the external components

• Internal softstart limits the inrush current

SY8089 pinout pdf



• Set Top Box

• Net PC

• Mini-Notebook PC

• Access Point Router

SY8089 PDF Datasheet