XCL208/XCL209 Series ETR28003-005 400mA Inductor Built-in Step-Down micro DC/DC Converters Green Operation Compatible GENERAL DESCRIPTION The XCL208/XCL209 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mm2.15mm, h=1.05mm). A stable power supply with an output current of 400mA is configured using only t wo capacitors connected externally. An internal coil simplifies the circuit and enables minimization of noise and other operational trouble due to the circuit wiring. A wide operating voltage range of 1.8V (2.0V) to 6.0V enables support for applications that require an alkaline battery (2-cell) or AC adapter (5V) power supply. An internally fixed output voltage (0.8V to 4.0V) or an externally set output voltage can be selected. The XCL208/XCL209 series uses synchronous rectification at an operating frequency of 3.0MHz. PWM control (XCL208) or automatic PWM/PFM switching control (XCL209) can be selected. The XCL208 series has a fixed frequency, enabling the suppression of output ripple. The XCL209 series achieves high efficiency while holding down output ripple across the full range of loads, from light to heavy, enabling the extension of battery operation time. Soft start and on/off functions with CL discharge are provided, and the IC can be put in the standby state by inputting a Low level signal into the CE pin. FEATURES APPLICATIONS Input Voltage : 1. 8V ~ 6.0V (Type F) Mobile phones, Smart phones : 2.0V ~ 6.0V (Type A/B) Bluetooth Headsets Fixed Output Voltage : 0.8V ~ 4.0V (2.0%) Tablet PCs High Efficiency : 90% (V =4.2V, V =3.3V) IN OUT PND Output Current : 400mA PC peripheral devices Oscillation Frequency : 3.0MHz (15%) DSC, Camcorders CE Function : A c t iv e H igh Soft-start Circuit Built-in C High Speed Auto Discharge L Protection Circuits : Current Limiter Built-in TYPICAL APPLICATION CIRCUIT (Constant Current & Latching) Control Methods : PWM (XCL208) PWM/PFM (XCL209) 2.06.0V 400mA (L2) (VOUT) (VIN) Operating Ambient Temperature : -40 ~ +85 CL Package : USP-10B03 CIN 10F 4.7F Environmentally Friendly : EU RoHS Compliant, Pb Free (PVss) (AVss) (CE) TYPICAL PERFORMANCE (Lx) (L1) CHARACTERISTICS Efficiency vs. Output Current XCL208A / XCL208B / XCL209A / XCL209B Type XCL208x333DR/XCL209x333D 400mA 100 XCL209(PWM/PFM) R1 80 1.86.0V CFB (L2) (FB) (VIN) CL 60 CIN R2 10F 4.7F VIN= 4.2V (PVss) (AVss) 40 5.0V XCL208(PWM) (CE) (Lx) 20 (L1) V =3.3V OUT 0 0.01 0.1 1 10 100 1000 XCL208F / XCL209F Type Output Current:IOUT (mA) 1/22 Efficiency:EFFI(%) XCL208/XCL209 Series BLOCK DIAGRAM 1) XCL208A / XCL209A Type 2) XCL208B / XCL209B Type L1 L2 L1 L2 V V OUT OUT L L X X V V IN IN PV PV SS SS AV AV SS CE SS CE 3) XCL208F / XCL209F Type L1 L2 FB L X V IN PVSS AV SS CE NOTE: The XCL208 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to level inside. The XCL209 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. 2/22