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                                      SY21133 - High Efficiency Fast Response, 3A, 23V Input Sync Buck

                                      Features

                                      ·       Low RDS(ON) for Internal Switches (Top/Bottom): 120/85m?

                                      ·       4.5-23V Input Voltage Range

                                      ·       Instant PWM Architecture to Achieve Fast Transient Responses

                                      ·       Programmable Soft-Start Limits the Inrush Current

                                      ·       Pseudo-Constant Frequency: 500khz

                                      ·      3AOutput Current Capability

                                      ·       ±1.5% 0.6V Reference

                                      ·       Hic-Cup Mode Output Short Circuit Protection

                                      ·       Rohs Compliant and Halogen Free

                                      ·       Compact Package: DFN3x3-10

                                      Typical Application

                                      Description


                                      SY21133 develops a high efficiency synchronous step down DC/DC converter capable of delivering 3A output current. SY21133 operates over a wide input voltage range from 4.5V to 23V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.


                                      SY21133 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 continuous conduction mode to minimize the size of inductor and capacitor.



                                      Applications

                                      ·       Set Top Box

                                      ·       Portable TV

                                      ·       Access Point Router

                                      ·       DSL Modem

                                      ·       LCD TV



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