SY21712VDC - 16V/12A Synchronous Step Down Regulator


  • Wide Input Voltage Range:

----3.6V to 16V if VCC is Supplied by Internal LDO

----2.7V to 16V if VCC is Supplied by External 3.3V DC Source

  • Low RDS(ON) for Internal Switches (Top/Bottom): 12.6mΩ/4.3mΩ
  • 0.6V ±1% Voltage Reference Over Temperature Range (TJ = -40°C to 125°C)
  • Adopt Constant-on-time Architecture and Frequency Lock Loop
  • Instant PWM Architecture to Achieve Fast Transient Response
  • 600kHz, 800kHz and 1000kHz Switching Frequency Operation Selected by MODE Pin
  • PFM/FCCM Light Load Operation Mode Selected by MODE Pin
  • Programmable Bottom Valley Limit by ILMT Pin
  • Reliable Protection Mode: Auto-Recovery Mode for UVP, UVLO, OTP and OVP
  • Cycle-by-cycle Valley Current Limit and Peak Current Limit
  • Cycle-by-cycle Reverse Current Limit
  • Internal Soft-start Limits the Inrush Current
  • Programmable Soft-start Time by SS Pin
  • Smooth Soft-start with Output Pre-biased Function
  • Adjustable Input Voltage UVLO by EN Pin
  • Power Good Indicator
  • Differential Output Voltage Remote Sense
  • Output Discharge Function
  • RoHS Compliant and Halogen Free
  • Compact Package: QFN3×4-19

Typical Application


The SY21712 develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 12A current. The device integrates high-side power switch and low-side synchronous rectifier with very low RDS(ON) to minimize the conduction loss. It provides accurate regulation for a variety of loads with an accurate ±1% voltage reference (VREF) over TJ= -40°C to 125°C.

The SY21712 operates over a wide input voltage range from 2.7V to 16V. The DC/DC regulator adopts the instant PWM architecture to achieve fast transient responses for high step down applications. Cycle-by-cycle current limit, hiccup over current protection and thermal shutdown protect the device during an over current condition.


  • Power Module
  • Telecom and Networking Systems
  • Servers
  • LCD-TV/Net-TV/3DTV
  • Set Top Box
  • Notebook
  • High Power AP