SY20419SUD - 1.8V Minimum Input and 5. 5V Maximum Output High Efficiency 1A Valley Current Synchronous Boost


  • 1.8V Minimum Input Voltage
  • Adjustable Output Voltage from 1.8V to 5.5V
  • Min 1A Valley Current Limit
  • CCM Only Operation
  • Load Disconnect During Shutdown
  • Low RDS(ON) (Main Switch/Synchronous Switch) at 3.3V Output: 70/125mΩ
  • Output OVP
  • RoHS Compliant and Halogen Free
  • Auto Bypass Mode When VIN ≥VOUT
  • Compact Package DFN2×1.5-6

Typical Application


The SY20419 is a high efficient, synchronous, step-up Boost converter designed for one-cell Li-Ion or Li-polymer, or a two to three-cell alkaline Ni-Cd or Ni-MH battery powered applications. It can convert down to 1.8V input voltage. It adopts NMOS for the main switch and PMOS for the synchronous switch.

The SY20419 can disconnect the output from input during the shutdown mode. When input voltage exceeds the regulated output voltage, the SY20419 enters bypass mode automatically.


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