FAN23SV56 6 A Synchronous Buck Regulator June 2015 FAN23SV56 6 A Synchronous Buck Regulator Description Features The FAN23SV56 is a highly efficient synchronous buck V Range: 7 V to 24 V Using Internal Linear IN regulator. The regulator is capable of operating with an Regulator for Bias input range from 7 V to 24 V and supporting 6 A V Range: 4.5 V to 5.5 V with V /P /P continuous load currents. The device can operate from IN IN VIN VCC a 5 V rail (10%) if V , P , and P are connected Connected to Bypass Internal Regulator IN VIN VCC together to bypass the internal linear regulator. High Efficiency: Over 96% Peak The FAN23SV56 utilizes Fairchilds constant on-time Continuous Output Current: 6 A control architecture to provide excellent transient MOSFETs R (Typical): HS: 12.2 m, response and maintain a relatively constant switching DS,ON LS: 5.6 m frequency. Pulse Frequency Modulation (PFM) Mode maximizes light-load efficiency by reducing switching Accurate Enable Facilitates V UVLO Functionality IN frequency when the inductor is operating in PFM Mode for Light-Load Efficiency Discontinuous Conduction Mode (DCM) at light loads, while clamping the minimum frequency above the Excellent Line and Load Transient Response audible range with Ultrasonic Mode. Precision Reference: 1% Over Temperature Switching frequency and over-current protection can Output Voltage Range: 0.6 to 5.5 V be programmed to provide a flexible solution for various applications. Output over-voltage, under- Programmable Frequency: 200 kHz to 1.5 MHz voltage, over-current, and thermal shutdown protections help prevent damage to the device during fault Programmable Soft-Start conditions. A hysteresis feature restarts the device Low Shutdown Current when normal operating temperature is reached. Adjustable Sourcing Current Limit Internal Boot Diode Thermal Shutdown Halogen and Lead Free, RoHS Compliant Applications Mainstream Notebooks Servers and Desktop Computers Game Consoles Telecommunications Storage Base Stations Ordering Information Operating Output Part Number Configuration Package Temperature Range Current (A) 34-Lead, PQFN, 5.5 mm x FAN23SV56MPX PFM with Ultrasonic Mode -40 to 125C 6 5.0 mm 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN23SV56 Rev. 1.10 FAN23SV56 6 A Synchronous Buck Regulator Typical Application Diagrams V = 19V IN V = 19V IN R11 C10 10 C9 2.2F 0.1F CIN CIN R7 0.1F 2x10F 61.9k VCC PVCC VIN PVIN Ext C3 EN EN 0.1F R8 V = 1.2V OUT BOOT 10k FAN23SV56MPX I =0-6A R7, R8 used for Accurate EN OUT L1 R7, R8 open for Ext EN 1.2H SW PGOOD ILIM SOFT START R2 C4 COUT R5 1.65k 1.5k 0.1F R3 4x47F 10k C5 C7 FREQ 100pF 15nF FB R9 54.9k R4 AGND PGND 10k Figure 1. Typical Application with V = 19 V IN V = 5V IN R11 C10 C9 10 2.2F 0.1F C C IN IN 0.1F 2x10F PVCC VIN PVIN VCC Ext C3 EN EN 0.1F V = 1.2V OUT BOOT FAN23SV56 I =0-6A OUT L1 1.2H SW PGOOD SOFT START ILIM R2 C4 COUT R5 1.65k 1.5k 0.1F 4x47F R3 10k C5 C7 FREQ 100pF 15nF FB R9 R4 54.9k AGND PGND 10k Figure 2. Typical Application with V =5 V IN 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN23SV56 Rev. 1.10 2