FAN8303: 2 A 23 V Non-Synchronous Step-Down DC-DC Regulator

The FAN8303 is a monolithic, non-synchronous, stepdown (buck) regulator with internal power MOSFETs. It achieves 2 A continuous output current over a wide input supply range with excellent load and line regulation. Current-mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. The regulator draws less than 40 µA shutdown current. FAN8303 requires a minimum number of readily available standard external components.

External compensation, enable, and programmable soft-start features allow design optimization and flexibility. Cycle-by-cycle current limit, frequency foldback, and thermal shutdown provide protection against shorted outputs.

Features

• 2 A Output Current
• 0.22 Ω Internal Power MOSFET Switch
• Wide 5 V to 23 V Operating Input Range
• Output Adjustable from 0.6 to 20 V
• Stable with Low ESR Output Ceramic Capacitors
• Up to 90% Efficiency
• Less than 40 µA Shutdown Current
• Fixed 370 kHz Frequency
• Thermal Shutdown with Hysteresis
• Cycle-by-Cycle Over-Current Protection
• Available in 8-Pin SOIC Package

Application Notes