2A Synchronous y Step-Down p DC/DC Converters New Product Release XC9242/XC9243 Series Digital Camera Mobile Phone Tablet PC Bluetooth Equipment The XC9242/XC9243 series of step-down DC/DC converters support ceramic capacitors, use a synchronous rectification circuit, and have an output current of 2A. A 0.11㱅 (TYP.) P-channel MOS driver transistor and a 0.12㱅 (TYP.) N-channel MOS switch transistor are built in. By reducing the on-resistance of the internal transistors, a stable voltage can be supplied with high efficiency up to an output current of 2A. The output voltage can be set as desired by connecting two external resistors to the FB pin. 1 Reduced on-resistance in the same package VIN=5.0V,VOUT=3.3V fOSC=1.2MHz(XC9243),1.0MHz(XC9223) USP-10B (2.6㬍2.9㬍0.6mm) 2.0A support is possible! 2 A built-in switch type step-down DC/DC converter can now support up to 2.0A with an input voltage of 6V or less. 100 Efficiency : EFFI(%) 95 VIN 90 85 XC9243 80 2.0A 6.0V XC9223 75 XC9235 XC9236 70 XC9223 XC9224 XC9242/XC9243 65 60 2.7V 2.5V 1.8V 55 50 100 1000 10000 Output Current : IOUT(mA) The XC9243 achieves high efficiency over a wide output current range through the use of PWM/PFM auto switching control. Thanks to a lower on-resistance, the XC9243 exhibits a higher efficiency at higher current than the previous product (XC9223). 3 1.0A 2.0A IOUT Miniaturization is achieved! XC9220/XC9221 (2.9㬍2.8mm) 䂓TYPICAL APPLICATION CIRCUIT 75䋦 Reduce SOT-25 XC9242/XC9243 (2.6㬍2.9mm) 㪭㪦㪬㪫 㪩 㪝㪙㪈 㪚㪝㪙 㪚㪣 㪣 㪧㪞㪥㪛 USP-10B SOT-89 㪣㫏 㪧㪞㪥㪛 SMA 㪩 㪝㪙㪉 㪝㪙 㪘㪞㪥㪛 㪣㫏 㪭㪠㪥 㪧㪭㪠㪥 㪚㪠㪥㪈 㪧㪭㪠㪥 㪘㪭㪠㪥 㪚㪜 㪚㪠㪥㪉 XP162A XBS304 (4.5㬍4.0mm) (5.2㬍2.8mm) In previous products, a P-ch power MOSFET and Schottky diode were necessary to achieve 2A output; however, these switching functions are built into the XC9242/XC9243 to reduce the number of components and achieve miniaturization. Features Driver Transistor Built-In 0.11㱅 (TYP.) P-ch Driver Tr. 0.12㱅 (TYP.) N-ch Switching Tr. 2.7V䌾6.0V Input Voltage Range Maximum Duty Cycle Function 䇭100䋦 Soft Start, CL Discharge Thermal Shutdown Output Voltage Setting 0.9V䌾VIN FB Voltage 0.8V±2.0䋦 Capacitor Ceramic Capacitor High Efficiency 95䋦 (TYP.) (VIN=5.0V, VOUT=3.3V) 2.0A Control Methods PWM (XC9242) PWM/PFM Auto(XC9243) 1.2MHz±15%, 2.4MHz±15% Package USP-10B Output Current Oscillation Frequency Current Limit Circuit 䋨Automatic Return䋩, UVLO www.torex.co.jp/english/ August 2011 䃂 Values shown in this sheet can be changed without any prior notice. New Product Release 2A Synchronous Step-Down DC/DC Converters䇭XC9242/XC9243 Series 4 Automatic return vs. Latch Device DC/DC Device CL 㪪㫎㫀㫋㪺㪿 㪦㪥 IOUT ON / OFF Lx 㪪㫎㫀㫋㪺㪿 㪦㪝㪝 Latch DC/DC Time C1 VOUT VOUT Device C2 Time Capacitance Load When a DC/DC converter with a latch-type overcurrent protection function is used in a circuit similar to that shown above and the circuit switches ON/OFF, the charge that goes to the capacitors (C1 and C2) becomes a large load and the output voltage drops suddenly. This may cause the short circuit protection function to activate, or the current limitation state may last longer than the latch time causing the latch function to activate and stop operation. When the XC9242/XC9243 is used in this type of situation, instead of the latch function activating and causing operation to stop, restart is automatically performed from the soft-start sequence without an external signal. This is convenient for restart by capacitor loads. 㪪㫎㫀㫋㪺㪿 㪦㪝㪝 XC9242 XC9243 㪪㫎㫀㫋㪺㪿 㪦㪥 IOUT Time VOUT Time 5 Comparison of step-down synchronous DC/DC converter characteristics 䇼The optimum product can be selected for the current䇽 Maximum Output Current Output Voltage Input Voltage Oscillation Frequency Control XC9242/XC9243 XC9235/XC9236/XC9237 2000mA 600mA XC9223/XC9224 1000mA 0.9V䌾VIN can be set with using externally connected resistors 0.8V䌾4.0V (0.05V Increments) 0.9V䌾VIN can be set with using externally connected resistors 2.7V䌾6.0V 1.8V䌾6.0V 2.5V䌾6.0V 1.2MHz±15% 2.4MHz±15% 1.2MHz±15% 3MHz±15% 1MHz±15% 䋨Synchronous external clock䋩 2MHz±15% 䋨Synchronous external clock䋩 PWM䋺䋨XC9242䋩 PWM/PFM Auto䋺䋨XC9243䋩 PWM䋺䋨XC9235䋩 PWM/PFM Auto䋺䋨XC9236䋩 Manual䋺(XC9237) PWM/PFM Auto (With PWM Fixed Pin)䋺 䋨Both XC9223/XC9224䋩 High Side P-ch ON Resistance Low Side N-ch ON Resistance Supply Current 0.11Ω @ VIN=5.0V 0.35Ω @ VIN=5.0V 0.19Ω @ VIN=5.0V 0.11Ω @ VIN=5.0V 0.45Ω @ VIN=5.0V 0.21Ω @ VIN=5.0V 41㱘A (1.2MHz) 15㱘A (1.2MHz) 30㱘A (1MHz) Package (mm) USP-10B (2.9㬍2.6㬍0.6) SOT-25 (2.9㬍2.8) USP-6C (1.8㬍2.0㬍0.6) USP-6EL (1.8㬍2.0㬍0.4) MSOP-10 (3.0㬍4.9) USP-10B (2.9㬍2.6㬍0.6) Function 䊶CE Function 䊶Current Limiter Circuit 䋨Constant Current & Automatic Return䋩 䊶Thermal Shutdown 䊶CL High Speed Discharge 䊶Soft Start 䊶CE Function 䊶Current Limiter Circuit 䋨Constant Current & Latching䋩 䊶CL High Speed Discharge 䊶High Speed Soft Start 䊶Synchronous External Clock 䊶CE Function 䊶Current limit binary switching selection 䋨Constant Current & Latching䋩 䊶Short-circuit Protection 䊶Thermal Shutdown 䊶Soft Start 䊶Voltage Detector (This function is always on with the XC9224) www.torex.co.jp/english/ August 2011 䃂 Values shown in this sheet can be changed without any prior notice.