FAN23SV04TAMPX: 4 A Synchronous Buck Regulator for DDR Termination

The FAN23SV04TAMPX is a highly efficient, integrated synchronous buck regulator for use in tracking applications, such as DDR termination rails. The VDDQ input includes an internal 2:1 resistive voltage divider to reduce total circuit size and component count. The regulator operates with an input range from 7 V to 18 V and supports up to 4 A load currents. The device can operate from a 5 V rail (±10%) if VIN, PVIN, and PVCC are connected together to bypass the internal linear regulator.

This device utilizes Fairchild’s constant on-time control architecture to provide excellent transient response and to maintain a relatively constant switching frequency.

Switching frequency and sourcing over-current protection can be programmed to provide a flexible solution for various applications.

Output over-current, and thermal shutdown protections help prevent damage during fault conditions. A hysteresis feature restarts the device when normal operating temperature is reached.

Features

• V_IN Range: 7 V to 18 V Using Internal Linear Regulator for Bias
  
• V_IN Range: 4.5 V to 5.5 V with V_IN/P_VIN/P_VCC Connected to Bypass Internal Regulator
  
• High Efficiency
  
• Continuous Output Current: 4 A
  
• Internal Linear Bias Regulator
  
• Internal V_DDQ Resistor Divider
  
• Excellent Line and Load Transient Response
  
• Output Voltage Range: 0.5 to 1.5 V
  
• Programmable Frequency: 200 kHz to 1.5 MHz
  
• Programmable Soft-Start
  
• Low Shutdown Current
  
• Adjustable Sourcing Current Limit
  
• Internal Boot Diode
  
• Thermal Shutdown
  
• Halogen and Lead Free, RoHS Compliant