XCL201 Series

400mA Inductor Built-in Step-Down “micro DC/DC” Converters

The XCL201 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mm×2.0mm, 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 0.42ΩP-ch driver transistor and 0.52 Ω N-ch switching transistor.

During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA 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 0.25 ms (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.

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Feb 16, 2011
Product News
Coil-Integrated Step-Down "micro DC/DC" Converters XCL201/XCL202 Series

Typical Application Circuit


Input Voltage Range 2.0V~6.0V
Output Voltage Range 0.8V~4.0V(Accuracy ±2.0%)
High Efficiency(VOUT=1.8V) 92%(VIN=4.2V,VOUT=3.3V)
Output Current 400mA
Oscillation Frequency 1.2MHz(Accuracy ±15%)
Maximum Duty Cycle 100%
Capacitor Low ESR Ceramic
Protection Circuits Current Limiter Circuit Built-In,(Constant Current & Latching)
Control Methods PWM
CE Function CL High Speed Auto Discharge



Technical Document

Quality Reports


QuestionWhat is the standby current?

The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.

QuestionWhat does the FB product mean?

An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2