SY21081CABC - High Efficiency Fast Response, 2A, 18V Input 1.2MHz Synchronous Step Down Regulator


·       Low RDS(ON) for Internal Switches (Top/Bottom):130/120 mΩ

·       4.5-18V Input Voltage Range

·      2ALoad Current Capability

·       Instant PWM Architecture to Achieve Fast Transient Responses

·       Internal Soft-start Limits the Inrush Current

·       0.810V Reference with ±2% Accuracy

·       Cycle-by-cycle Peak Current Limitation

·       RoHS Compliant and Halogen Free

·       Compact Package: SOT23-6

Typical Application


SY21081C develops high efficiency synchronous step-down DC-DC converter capable of delivering2Aload current. SY21081C 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.

SY21081C 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 1.2MHz under heavy load conditions to minimize the size of inductor and capacitor. 


·       Set Top Box

·       Portable TV

·       Access Point Router

·       DSL Modem

·       LCD TV

·       CCTV

·       IPCAM

·       Networking