XCL208 Series

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

The XCL208 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mm×2.15mm, h=1.05mm). A stable power supply with an output current of 400mA is configured using only two 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 series uses synchronous rectification at an operating frequency of 3MHz. The XCL208 series has a fixed frequency, enabling the suppression of output ripple.

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.

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Apr 24, 2012
Product News
400mA "micro DC/DC" Converter with Integrated Coil XCL208/XCL209 Series

Typical Application Circuit


Input Voltage Range 1.8V~6.0V(TypeF)
Output Voltage Range 0.8V~4.0V(±2.0%)(Fixed)
High Efficiency 90%(VIN=4.2V,VOUT=3.3V)
Output Current 400mA
Oscillation Frequency 3.0MHz(±15%)
CE Function Active High
Soft-start Circuit Built-in
CL High Speed Auto Discharge
Protection Circuits Current Limiter Built-in(Constant Current & Latching)
Control Methods PWM
Operating Ambient Temperature -40℃~+85℃
Environmentally Friendly EU RoHS compliant, Pb free



Technical Document

Quality Reports


QuestionWhat is the soft-start function?

The function to soften the rise to prevent the inrush current.