SY21081ABC - High Efficiency Fast Response, 2A, 18V Input 1.2MHz Synchronous Step Down Regulator


·       Low RDS(ON) for Internal Switches (Top/Bottom):140/130 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

·       2% 0.6V Reference

·       RoHS Compliant and Halogen Free

Compact Package: SOT23-6/ DFN2x2-6

Typical Application


SY21081 develops high efficiency synchronous step-down DC/DC converter capable of delivering2Aload current. SY21081 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.

SY21081 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 MHz under heavy load conditions to minimize the size of inductor and capacitor.


·       Set Top Box

·       Portable TV

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·       DSL Modem

·       LCD TV