6 A SYNCHRONOUS BUCK REGULATOR

The FAN2356 is a highly efficiént synchronous buck regulator. The regulator is capable Of operating with an input range from 4.5 V to 24 V and supporting up to 6 A continuous load currents. The FAN2356 utilizes Fairchild"s constant on-time control architecture to provide excellent transient response and to maintain a relatively constant switching frequency. This device utilizes Pulse Frequency Modulation (PFM) rntxie to maximize light-load efficiency by reducing snitching frequency when the inductor is operating in discontinuous conduction mode at light bads, Mhile clamping the minimum frequency above the audible range With ultrasonic mode. 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 darnage to the deuce during fault conditions. After thermal shutdown is activated, a hysteresis feature restarts the deuce When normal operating temperature is reached.

• Range: 4.5 v to 24 v
• High Efficiency: Over to 96% Peak
• Continuous Output Current: 6 A
• PFM Mode for Light-Load Efficiency
• Excellent Line and Load Transient Response
• Precision Reference: ± I % Over Temperature
• Output Voltage Range: 0.6 to 5.5 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