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XC9237E08DMR-G Datasheet(PDF) 1 Page - Torex Semiconductor |
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XC9237E08DMR-G Datasheet(HTML) 1 Page - Torex Semiconductor |
1 / 33 page 1/33 XC9235/XC9236/XC9237 Series 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 Output Current:IOUT(mA) PWM/PFM Automatic Sw itching Control PWM Control VIN= 4.2V 3.6V 2.4V VIN= 4.2V 3.6V 2.4V ☆GreenOperation Compatible ■APPLICATIONS ●Mobile phones, Smart phones ●Bluetooth headsets ●Mobile WiMAX PDAs, MIDs, UMPCs ●Portable game consoles ●Digital cameras, Camcorders ●MP3 Players, Portable Media Players ●Notebook computers ETR0514-011a ■GENERAL DESCRIPTION The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω P-channel MOS driver transistor and 0.52ΩN-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V (A∼C types), 1.8V to 6.0V (D∼G types). For the D/F types which have a reference voltage of 0.8V (accuracy: ±2.0%), the output voltage can be set from 0.9V by using two external resistors. The A/B/C/E/G types have a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy: ±2.0%). The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. The B/F/G types have a high speed soft-start as fast as 0.25ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage becomes 1.4V or lower. The B to G types integrate CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function. Three types of package SOT-25 (A/B/C types only), USP-6C, and 0.4mm low height USP-6EL (A/B/C types only) are available. ■FEATURES Driver Transistor Built-In : 0.42Ω P-ch driver transistor 0.52Ω N-ch switch transistor Input Voltage : 2.0V ~ 6.0V (A/B/C types) 1.8V ~ 6.0V (D/E/F/G types) Output Voltage : 0.8V ~ 4.0V High Efficiency : 92% (TYP.) Output Current : 600mA Oscillation Frequency : 1.2MHz, 3.0MHz (+15%) Maximum Duty Cycle : 100% Control Methods : PWM (XC9235) PWM/PFM Auto (XC9236) Function PWM/PFM Manual (XC9237) : Current Limiter Circuit Built-In (Constant Current & Latching) Capacitor CL Discharge (B/C/D/E/F/G types) High Speed Soft Start (B/F/G type) : Low ESR Ceramic Capacitor Packages : SOT-25 (A/B/C types only), USP-6C USP-6EL(A/B/C types only) Environmentally Friendly : EU RoHS Compliant, Pb Free ■TYPICAL PERFORMANCE CHARACTERISTICS ●Efficiency vs. Output Current(fOSC=1.2MHz, VOUT=1.8V) ●XC9235/XC9236/XC9237 A/B/C/E/G types (Output Voltage Fixed) ●XC9235/XC9236/XC9237 D/F types (Output Voltage Externally Set) ■TYPICAL APPLICATION CIRCUIT |
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