400mA, 3MHz Synch Step-Down Micro DC/DC with Integrated Inductor

Application Notes

• XCL208 Series - PWM Only• XCL209F083DR Series - PWM/PFM Automatic

The XCL208/209 series are 400mA, 3MHz synchronous step-down DC-DC converters with integrated inductor. The whole solution, including inductor, measures only 2.5mm x 2.15mm and has a package profile of only 1.05mm making it one of the smallest solutions of its kind on the market today. Requiring only 2 external ceramic capacitors to configure a step-down circuit capable of providing efficiencies in excess of 85%, the XCL208/209 is ideally suited for applications that require high efficiency plus low output noise in an extremely small PCB area.

Input voltage range is 1.8V to 6.0V and output voltages from 0.8V to 4.0V (+/-2%) can be selected in 50mV steps (factory laser trimmed). The XCL208/209 F type allows the output voltage to be externally set using a resistor ladder and thereby offering additional flexibility.

The XCL208/209 B type features an auto CL discharge function as well as a high speed soft-start function (0.25ms typ. compared to 0.9ms typ. with the XCL208/209 A type). All versions feature a built-in current limiter (constant current and latching) and short circuit protection. A CE pin enables the device to be put into stand-by thereby reducing current consumption from an already low 21μA typ. in operation to less than 1.0μA in stand-by.

Features:

• Input Voltage: 1.8V ~ 6.0V• Output Voltage: 0.8V ~ 4.0V• Output Current: 400mA• Oscillator Frequency: 3MHz• Compatible with ceramic capacitors• Built-in soft start circuit• Built-in current limiter circuit• Stand-by Current: 1.0μA (max)• Small 2.5mm x 2.15mm x 1.05mm USP-10B03 package• Only 2 External Components required