SY8120B1 PDF – Synchronous Step Down Regulator – Silergy

A synchronous step-down regulator, also known as a synchronous buck regulator, is a type of DC-DC (direct current to direct current) voltage converter used to efficiently reduce the input voltage to a lower, regulated output voltage. These regulators are widely used in various electronic devices and power management applications where power efficiency and precise voltage regulation are essential.

Part Number: SY8120B1

Function: 2A, 18V Input, Synchronous Step Down Regulator

Package: SOT23-6 Type

Manufacturer: Silergy

Images:SY8120B1 pdf


The SY8120B1 develops high efficiency synchronous stepdown DC-DC converter capable of delivering 2A load current . SY8120B1 operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. SY8120B1 adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500 kHz under heavy load conditions to minimize the size of inductor and capacitor.


• Low RDS(ON) for internal switches (top/bottom):130/120 mΩ

• 4.5-18V input voltage range

• 2A load current capability

• Instant PWM architecture to achieve fast transient responses Internal softstart limits the inrush current

• 2% 0.6V reference

• Cycle-by-cycle peak current limitation

• RoHS Compliant and Halogen Free

SY8120B1 pinout datasheet



• Portable TV

• Access Point Router

• DSL Modem




• Networking

SY8120B1 PDF Datasheet