SY20631QNC - High Efficiency, Built-in Inductor, 2.0MHz, 1A, 0.85V-5.5V Input Synchronous Step Up Regulator


  • 0.85V Minimum Input Voltage
  • Adjustable Output Voltage From 1.8V to 5.5V
  • 1A Load Current Capability
  • 5.5µA Typical Quiescent Current
  • Load Disconnect During Shutdown
  • Low RDS(ON) (Main Switch/Synchronous Switch) at 3.3V Output: 65/120mΩ
  • Pseudo-constant Frequency:2.0MHz
  • Output OVP
  • Auto Bypass Mode When VIN ≥VOUT
  • RoHS Compliant and Halogen Free
  • Compact Package QFN3×3-10

Typical Application


The SY20631 is a high efficient, synchronous step-up converter, which integrates an inductor into a compact 3×3×2mm package. It is designed for one-cell Li-Ion or Li-polymer, or a two to three-cell alkaline Ni-Cd or Ni-MH battery powered applications and can convert down to 0.85V input voltage. It adopts NMOS for the main switch and PMOS for the synchronous switch.

The SY20631 can disconnect the output from the input during the shutdown mode. When the input voltage exceeds the regulated output voltage, the SY20631 will enter the bypass mode automatically.


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