SY22841AAC (SY50281AAC)

Buck Regulator With CV/CC Control

SY22841AAC Buck Regulator With CV/CC Control Datasheet

Parameters
Features
Description

Part number	SY22841AAC
Pout (max) (W)	3
HV startup	NO
Iout (max) (A)	0.25
Vout (typ)(V)	Adjustable
Breakdown voltage (V)	500
Ron (typ) (mΩ)	12
Switching frequency (min)(kHz)	45
Switching frequency (max)(kHz)	45
Operation mode	QR
No load loss (mW)	<75
Features	CC/CV
Package	SOT23-5
Operating temperature range(°C)	-40 to 125
Functional safety category

Integrated 500V MOSFET
CC/CV control eliminates Aux-winding
Quasi-Resonant (QR) mode to achieve low switching losses
Fast Startup (<500ms)
Low start up current: 15µA typical
Maximum frequency limit: 45kHz
Compact package: SOT23-5

Evaluation Board

Photo of evaluation board
Photo of evaluation board

EVB_SY22841

EVB File

The SY22841 is a PWM controller with several features to enhance performance of Buck converters. It integrates a MOSFET with 500V breakdown voltage to decrease physical volume. Both current and voltage regulation are achieved by the controller. It drives the Buck converter in the quasi-resonant mode to achieve higher efficiency and better EMI performance.

Technical Documentation

Title	Date
Silergy_Catalog_Q2_2026	2026-06-12