2.0A Inductor Built-in Step-Down “micro DC/DC” Converters

The XCL211series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (3.1mm×4.7mm, h=1.3mm).

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 2.7V to 6.0V enables support for applications that require an externally set output voltage can be selected. The XCL211 series has a fixed frequency, enabling the suppression of output ripple.

The series have a high speed soft-start as fast as 1ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.4V or lower. It’s suitable for large-current application due to limit current is configured 4.0A in typical. The integrated 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. Due to CL discharge function, malfunction on LX is prevented when Stand-by mode.


Input Voltage Range 2.7V~6.0V
Output Voltage 0.9V~VIN(FB Voltage=0.8V±2%)
Output Current 2.0A
High Efficiency 0.94
Control Methods PWM
Maximum Duty Cycle 100%
Functions Current Limit Circuit (automatic return)
Operating Ambient Temperature -40~+85℃
Environmentally Friendly EU RoHS compliant, Pb free

Typical Application Circuit

Technical Document


Package Number of Pins Pcs/Reel Package Size(mm)
USP-11B01 11 1,000 3.1 x 4.7 x 1.35

XCL211 Series Part Numbers

Part number Sample Reference Voltage Oscillation Frequency Packages EDA Online Store
XCL211B082DR 0.8V 2.4MHz USP-11B01

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