SY8120B PDF Datasehet – 2A, 18V, Step Down Regulator

A step-down regulator, also known as a buck regulator or buck converter, is an electronic circuit or device used in power electronics to convert a higher input voltage into a lower output voltage while maintaining a relatively stable output. It’s a type of DC-DC converter. The primary function of a step-down regulator is to efficiently reduce voltage levels, making it useful in various applications where you need to supply power at a lower voltage than the input voltage.

Part Number: SY8120B

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

Package: SOT23-6 Type

Manufacturer: Silergy

Images:SY8120B pdf regulator


SY8120B develops high efficiency synchronous stepdown DC-DC converter capable of delivering 2A load current . SY8120 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.

SY8120B 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 under heavy load conditions to minimize the size of inductor and capacitor.


1. Low RDS(ON) for internal switches (top/bottom):145/135 m

2. 4.5-18V input voltage range

3. 2A load current capability

5. 2% 0.6V reference

6. RoHS Compliant and Halogen Free

SY8120B pinout datasheet



1. Set Top Box

2. Portable TV

3. Access Point Router

4. DSL Modem


SY8120B PDF Datasheet