XC9242/XC9243 Series ETR0521-012 2A Synchronous Step-Down DC/DC Converters GreenOperation Compatible GENERAL DESCRIPTION The XC9242/XC9243 series is a group of synchronous-rectification step-down DC/DC converters with a built-in 0.11 (TYP.) P-channel MOS driver transistor and 0.12 (TYP.) N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. The small on-resistances of these two internal driver transistors enable a high efficiency, stable power supply with an output current up to 2A. The XC9242/XC9243 series has operating voltage range of 2.7V~6.0V and a 0.8V (2.0%) reference voltage, and using externally connected resistors, the output voltage can be set freely from 0.9V. With an internal switching frequency of 1.2MHz or 2.4MHz, small external components can be used. The XC9242 series is PWM control, and the XC9243 series is PWM/PFM, which automatically switches from PWM to PFM during light loads and provides high efficiency, high load response, low voltage ripple, can be achieved over a wide range of load conditions. The series have a high speed soft-start as fast as 1ms in typical for quick turn-on. Its suitable for large-current application due to limit current is configured 4.0A in typical. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0 A or less. The integrated C discharge function which enables the electric L charge at the output capacitor C to be discharged via the internal discharge switch located between the L and V pins. L X SS Due to C discharge function, malfunction on L is prevented when Stand-by mode. With the built-in UVLO (Under Voltage L X Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.5V or lower. The series are available in USP-10B, SOP-8FD packages. FEATURES APPLICATIONS Driver Transistor : 0.11 P-ch Driver Transistor 0.12 N-ch Switching Transistor Smart phones / Mobile phones Input Voltage Range : 2.7V 6.0V Bluetooth Output Voltage Setting : 0.9V V IN Mobile devices / terminals FB Voltage : 0.8V2.0% Portable game consoles High Efficiency : 95%(TYP.)* Digital still cameras / Camcorders Output Current : 2.0A Oscillation Frequency : 1.2MHz15%, 2.4MHz 15% Maximum Duty Cycle : 100% Functions : Soft-Start Circuit Built-In C Discharge L Current Limit Circuit automatic return Thermal Shutdown UVLO Output Capacitor : Low ESR Ceramic Capacitor Control Methods : PWM control (XC9242) PWM/PFM Auto (XC9243) Operating Ambient Temperature : -40 ~ +85 Packages :USP-10B, SOP-8FD Environmentally Friendly : EU RoHS Compliant, Pb Free * Performance depends on external components and wiring on the PCB. TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs. Output Current (fosc=1.2MHz, V =3.3V) OUT XC9242/XC9243 Series (FB Type) 1/29 XC9242/XC9243 Series BLOCK DIAGRAM XC9242/XC9243 Series * Diodes inside the circuits are ESD protection diodes and parasitic diodes. PRODUCT CLASSIFICATION Ordering Information (*1) XC9242 - Fixed PWM control (*1) XC9243 - PWM / PFM automatic switching control DESIGNATOR ITEM SYMBOL DESCRIPTION Functional Selection B C Discharge L Output Voltage 08 Reference Voltage is fixed at 0.8V C 1.2MHz Oscillation Frequency D 2.4MHz (*2) DR-G USP-10B (3,000/Reel) (*1) - Package (Order Unit) QR-G SOP-8FD (1,000/Reel) (*1) The -G suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. (*2) The USP-10B reels are shipped in a moisture-proof packing. Selection Guide SOFT-START CHIP CURRENT THERMAL C AUTO- L TYPE UVLO TIME ENABLE LIMITER SHUTDOWN DISCHARGE B Fixed Yes Yes Yes Yes Yes 2/29