XCL201/XCL202 Series ETR2802-008 Inductor Built-in Step-Down micro DC/DC Converters Green Operation Compatible GENERAL DESCRIPTION The XCL201/XCL201 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mm2.0mm, h=1.0mm). A stable power supply with an output current of 400mA is configured using only two capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of 0.05V. The device is operated by 1.2MHz, and includes 0.42 P-channel driver transistor and 0.52 N-channel switching transistor. As for operation mode, the XCL201 series is PWM control, the XCL202 series is automatic PWM/PFM switching control, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0A or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes 1.4V or lower. The series provide short-time turn-on by the soft start function internally set in 0.25ms (TYP). The series integrate CL auto discharge function which enables the electric charge stored at the output capacitor CL to be discharged via the internal auto- 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. FEATURES APPLICATIONS Ultra Small : 2.5mm2.0mm, h=1.0mm Mobile phones, Smart phones Input Voltage : 2.0V ~ 6.0V Bluetooth Headsets Output Voltage : 0.8V ~ 4.0V (2.0%) High Efficiency : 92% (V =4.2V,V =3.3V) IN OUT WiMAX PDAs, MIDs, UMPCs Output Current : 400mA Portable game consoles Oscillation Frequency : 1.2MHz (15%) Digital cameras, Camcorders Maximum Duty Cycle : 100% Output Capacitor : Low ESR Ceramic SSD(Solid State Drive) Function : Current Limiter Circuit PND(Portable Navigation Device) (Constant Current & Latching) Soft-Start Circuit Built-In C Discharge L Control Methods : PWM (XCL201) PWM/PFM Auto (XCL202) Operating Ambient Temperature : -40 ~ 85 Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL PERFORMANCE TYPICAL APPLICATION CIRCUIT CHARACTERISTICS XCL201B331BR/XCL202B331BR XCL201/XCL202 Series 100 X C L2 02 (PW M / PF M ) L1 80 V IN LX 60 CIN VI N = 5. 5V 4.7F Vss Vss C L 40 10F X C L2 01 (PW M ) 5. 0V CE VOUT 400mA 20 4. 2V L2 VOU T = 3. 3V 0 (TOP VIEW) 0 . 0 1 0 . 1 1 10 100 1000 * L1 and L , and L2 and V is connected by wiring. X OUT O u t p u t COuU(rTmr eAn)t : I 1/22 E f f i c e n c y : E F F I ( % ) XCL201/XCL202 Series BLOCK DIAGRAM XCL201B / XCL202B Series L2 L1 Inductor Phase Current Feedback Current Limit VOUT Compensation R1 CFB PWM Error Comparator Amp. Synch FB Logic Buffer Lx Drive R2 VSHORT Vref with PWM/PFM Soft Start, Selector CE VIN VSS UVLO Cmp Ramp Wave Generator CE/ OSC R3 UVLO CE R4 Control VSS CE Logic NOTE: The XCL201 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to level inside. The XCL202 control scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed to level inside. The diodes placed inside are ESD protection diodes and parasitic diodes. PRODUCT CLASSIFICATION Ordering Information (*1) XCL201- Fixed PWM control (*1) XCL202- PWM / PFM automatic switching control DESIGNATOR ITEM SYMBOL DESCRIPTION Functions selection B CL auto discharge, High speed soft-start Output voltage options e.g. 1.2V =1, =2 1.25V =1, =C Output Voltage 08 ~ 40 0.05V increments : 0.05=A, 0.15=B, 0.25=C, 0.35=D, 0.45=E, 0.55=F, 0.65=H, 0.75=K, 0.85=L, 0.95=M Oscillation Frequency 1 1.2MHz (*2) BR-G CL-2025 (3,000pcs/Reel) Package - (*3) (Order Unit) ER-G CL-2025-02 (3,000pcs/Reel) (*1) The -G suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. (*2) BR-G is storage temperature range-40 ~ 105. (*3) ER-G is storage temperature range-40 ~ 125 . 2/22