FAN8303MX

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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. 2 A Output Current 0.22  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 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. Thermal Shutdown with Hysteresis Cycle-by-Cycle Over-Current Protection Available in 8-Pin SOIC Package Applications C BS 10 nF INPUT      5~23V C IN 10 µF Set-Top Box VIN DSL and Cable Modems ENABLE SHUTDOWN BS EN Distributed Power Systems L1 15 µH SS FB R2 18 k COMP GND Auxiliary supplies 2.5V/2A D1 FAN8303 Consumer Appliances (DVD) OUTPUT SW C OUT CSS 22 µF R3 10 nF RC 22 k CC 1nF 5.6 k CA OPEN Figure 1. Typical Application Ordering Information Part Number Operating Temperature Range Package Packing Method FAN8303MX -40°C to +85°C 8-SOIC Reel For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation FAN8303 • Rev. 1.2 www.fairchildsemi.com FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator June 2016 Figure 2. © 2008 Fairchild Semiconductor Corporation FAN8303 • Rev. 1.2 Functional Block Diagram FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator Internal Block Diagram www.fairchildsemi.com 2 BS SS VIN EN SW COMP GND Figure 3. FB Pin Configuration (Top View) Pin Definitions Name Pin # Type Description BS 1 Bootstrap VIN 2 Supply Voltage Power Input. This pin needs to be closely decoupled to the GND pin with a 10 µF or greater ceramic capacitor. SW 3 Switch Power Switching Output. SW is the switching node that supplies power to the output. High-Side Drive BOOT Voltage. Connect through capacitor (CBS) to SW. The IC includes an internal synchronous bootstrap diode to recharge the capacitor on this pin to VCC when SW is LOW. GND 4 Ground Power Return and Signal Ground for the IC. All internal control voltages are referred to this pin. Tie this pin to the ground island / plane through the lowest impedance connection. This pin is the ground reference for the regulated output voltage. FB 5 Feedback Feedback Input. This pin is the center tap of the external feedback voltage resistive divider across the output. COMP 6 Compensation EN 7 Enable Enable Input. EN is a digital input that turns the regulator on or off. Drive EN HIGH to turn on the regulator, drive it LOW to turn it off. For automatic startup, leave EN unconnected. SS 8 Soft Start External Soft-Start. A capacitor connected between this pin and GND can be used to set soft-start time. © 2008 Fairchild Semiconductor Corporation FAN8303 • Rev. 1.2 Compensation Node. Frequency compensation is accomplished at this node by connecting a series R-C to ground. FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator Pin Configuration www.fairchildsemi.com 3 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. All voltage values, except differential voltages, are given with respect to the network ground terminal. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device Symbol Parameter Min. Max. Unit 25 V VIN+0.3 V VSW + 6 V VIN Supply Voltage, VIN to GND VSW Switch Voltage, SW to GND VBS Boost Voltage VFB Feedback Voltage -0.3 6.0 V VEN Enable Voltage -0.3 6.0 V Compensation Voltage -0.3 6.0 V VSS Soft-Start Voltage -0.3 6.0 V ΘJA Thermal Resistance, Junction-Air 105 °C/W ΘJC Thermal Resistance, Junction-Case 40 °C/W +125 °C +260 °C +150 °C VCOMP -0.3 TJ Operating Junction Temperature -40 TL Lead Temperature (Soldering, 5 Seconds) TSTG Storage Temperature Range -65 ESD Electrostatic Discharge Human Body Model, JEDEC JESD22-A114 Protection Level Charged Device Model, JEDEC JESD22-C101 3.0 kV 2.5 Recommended Operating Conditions FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator Absolute Maximum Ratings The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter VIN Supply Voltage TA Operating Ambient Temperature © 2008 Fairchild Semiconductor Corporation FAN8303 • Rev. 1.2 Min Max. Unit 5 23 V -40 +85 C www.fairchildsemi.com 4 VIN=12 V, TA= -40 to +85C, unless otherwise noted. Symbol VFB Parameter Feedback Voltage Condition Min. Typ. Max. Unit 25°C, 5V