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                                      SY20445 - 1.8V Minimum Input and 5. 5V Maximum Output

                                      Features

                                      • 1.8V Minimum Input Voltage
                                      • Adjustable Output Voltage from 2.5V to 5.5V
                                      • 5A peak Current Limit
                                      • Input under Voltage Lockout
                                      • Load Disconnect during Shutdown
                                      • Output Over Voltage Protection
                                      • Input Battery Voltage Monitor
                                      • Automatic Output Discharge at Shutdown:

                                      o     SY20445: Auto Output Discharge Function

                                      o     SY20445A: No Output Discharge Function

                                      • Low RDS(ON) (Main Switch/Synchronous Switch) at 5.0V Output: 20/40m?
                                      • Compact Package: QFN2x2-10

                                      Typical Application

                                      Description

                                      SY20445/SY20445A is a high efficiency synchronous Boost regulator that converts down to 1.8V input and up to 5.5V output voltage. It adopts NMOS for the main switch and PMOS for the synchronous switch. It can disconnect the output from input during the shutdown mode.

                                      Applications

                                      • All Single Cell Li or Dual Cell Battery Operated Products as MP-3 Player, PDAs, and Other Portable Equipment

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