SY21248 -


·       Low RDS(ON) for Internal Switches (Top/Bottom): 30/10mΩ

·       Wide Input Voltage Range: 4-23V

·       Output Voltage Range: 0.6~2.5V

·       External  Bypass Input

·       Instant PWM Architecture to Achieve Fast Transient Responses

·       Internal 400us Soft-Start Limits the Inrush Current

·       Pseudo-Constant Frequency: 500kHz.

·       8A Continuous/16A Peak Output Current Capability

·       ±1.0% 0.6V Reference

·       Programmable Valley Current Limit

·       Power Good Indicator

·       Output Discharge Function

·       Short Circuit Latch Off Protection

·       Over Voltage Latch Off  Protection

·       Thermal Shutdown

·       Input UVLO

·       Rohs Compliant and Halogen Free

·       Compact Package: QFN3x3-20

Typical Application


The SY21248 develops a high efficiency synchronous step-down DC-DC regulator capable of delivering 8A continuous, 16A peak current. The device integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. SY21248 also integrates a bypass switch which allows the IC to be powered by external DC source.

The SY21248 operates over a wide input voltage range from 4V to 23V. The DC-DC regulator 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 500kHz under heavy load conditions to minimize the size of inductor and capacitor. SY21248 is optimized for lower than 2.5VOUT application


·       LCD-TV/Net-TV/3DTV

·       Set Top Box

·       Notebook

·       High Power AP