SY20492ABC - 1.8V Minimum Input and 5. 5V Maximum Output High Efficiency 2A Valley Current Synchronous Boost


  • 1.8V Minimum Input Voltage
  • Adjustable Output Voltage from 1.8V to 5.5V
  • Min 2A Valley Current Limit
  • 5µA Typical Quiescent Current
  • Load Disconnect During Shutdown
  • Low RDS(ON) (Main Switch/Synchronous Switch) at 3.3V Output: 100/170mΩ
  • Output OVP
  • Auto Bypass Mode When VIN ≥VOUT
  • RoHS Compliant and Halogen Free
  • Compact Package SOT23-6

Typical Application


The SY20492 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 SY20492 can disconnect the output from input during the shutdown mode. When input voltage exceeds the regulated output voltage, the SY20492 enters bypass mode automatically.


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