Power Electronics

Ultra Low Power, Step-Up, Micro DC/DC Converter with Integrated Coil

Torex Semiconductor Ltd. has developed the XCL101 series, the first step-up type converter in the XCL series of micro DC/DCs with integrated coil. The XCL101 series is a step-up micro DC/DC converter with integrated coil in an ultra-small CL-2025 package (dimensions: 2.5 mm x 2.0 mm x 1.0 mm). A stable and efficient power supply circuit can be configured by simply adding only two ceramic capacitors externally thereby contributing to PCB space saving and the shortening of development time. Integration of the coil simplifies the board layout and minimizes any unwanted radiated noise.

With an operating voltage range of 0.9V to 5.5V, this series is ideal for applications that run on a single alkaline or nickel-hydrogen battery. An output voltage of 1.8V to 5.0V can be selected in steps of 0.1V (±2.0% accuracy). Synchronous rectification PFM control is used for the control method which minimizes the quiescent current to only 6.3µA as well as achieving high efficiency. The XCL101 series has an internal inrush current prevention circuit to reduce any potential device instability that can be caused by inrush current when the IC starts. The XCL101 series also features a soft-start circuit, an enable pin to turn the IC on and off and a load disconnect function that prevents the battery charge from leaking to the output while the IC is not operating (XCL101A). An optional CL discharge function can quickly discharge the output capacitor when the IC is turned off and an Input by-pass mode function type is also available to keep the connection between the input and output side during shutdown (XCL101C).

The XCL series is the first step-up type micro DC/DC converter and is an environment friendly product that complies with the EU RoHS Directive and is Pb, halogen and antimony.

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