Step-down micro DC/DC converters have integrated coil
Step-down micro DC/DC converters make up the XCL225/XCL226 series from Torex Semiconductor.
The 18V coil-integrated converters contribute to space-saving on the board and a shorter development time because a circuit can be configured by simply adding two external ceramic capacitors, explains Torex. An internal coil lowers EMI and also simplifies the board layout and makes it possible to minimise radiation noise and circuit operation issues.
The package is a small DFN3030-10B, measuring 3.0 x 3.0 x 1.7mm. The maximum input voltage of 18V allows the XCL225/XCL226 to be used for a range of industrial equipment and IoT devices, including refrigerators and air conditioners. Other target applications are electronic devices, point of sale terminals, industrial equipment, and IoT devices that use two or three lithium-ion batteries or four or more dry-cell batteries.
The operating voltage range is 3.0 to 18V, and the maximum output current is 0.5A. The switching frequency is 1.2MHz. The XCL225 uses PWM control to provide minimum output ripple voltage by fixing the operating frequency. The XCL226 uses PWM/PFM auto switching control to lower the operating frequency at light loads which reduces power dissipation and realises high efficiency from light loads to heavy loads. The output voltage can be set within a range of one to 15V using external resistors, adds Torex.
A soft start function is set internally to 1.0ms, typical. The soft start time can be adjusted using an external resistor.
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