FAN23SV70AMPX: 20 A Synchronous Buck Regulator

The FAN23SV70AMX is a highly efficient synchronous buck regulator. The regulator is capable of operating with an input range from 7 V to 24 V and supporting up to 20 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.

The FAN23SV70A utilizes Fairchild’s constant on-time control architecture to provide excellent transient response and to maintain a relatively constant switching frequency. The device utilizes Pulse Frequency Modulation (PFM) mode to maximize light-load efficiency by reducing switching frequency when the inductor is operating in discontinuous conduction mode at light loads.

Switching frequency and over-current protection can be programmed to provide a flexible solution for various applications. Output over-voltage, under-voltage, over-current, and thermal shutdown protections help prevent damage to the device during fault conditions. After thermal shutdown is activated, a hysteresis feature restarts the device when normal operating temperature is reached.

Features

• V_IN Range: 7 V to 24 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: Over 96% Peak
  
• Continuous Output Current: 20 A
  
• Internal Linear Bias Regulator
  
• Accurate Enable facilitates VIN UVLO Functionality
  
• PFM Mode for Light-Load Efficiency
  
• Excellent Line and Load Transient Response
  
• Precision Reference: ±1% Over Temperature
  
• Output Voltage Range: 0.6 to 5.5 V
  
• 
  Programmable Frequency: 200 kHz to 1 MHz
  
• Programmable Soft-Start
  
• Low Shutdown Current
  
• Adjustable Sourcing Current Limit
  
• Internal Boot Diode
  
• Thermal Shutdown
  
• Halogen and Lead Free, RoHS Compliant