400mA Micro DC/Dc Converter with Integrated Coil Maximises Efficiency

The simplicity of the XCL construction means that it’s also inexpensive to produce, which makes the XCL20x series ideal for cost sensitive applications where PCB space is at a premium.

With an integrated fully shielded Inductor, the XCL201/02 family is designed to minimise EMC emissions and radiated noise, whilst maximising efficiency. The XCL201/02 also delivers a very stable output with low peak to peak ripple (<10mV), ideal for RF applications.

Able to deliver output currents up to 400mA, the XCL201/02 utilises a 1.2MHz switching frequency to minimise losses and increase efficiency. The XCL201 series offers PWM control, whereas the XCL202 series applies automatic PWM/PFM switching control, allowing fast response, low ripple and high efficiency over the full range of output loads (from light load to heavy load).

Measuring only 2.5mm×2.0mm, h=1.0mm the XCL201/02 needs only two capacitors connected externally to generate a stable power supply. The operating voltage range is from 2.0V to 6.0V and the output voltage is internally set in a range from 0.8V to 4.0V in increments of 0.05V.

The XCL201/02 series include a 0.25ms high speed soft-start for quick turn-on, a chip enable pin to turn the IC on and off and a CL discharge function to quickly discharge the output capacitor when the IC is turned off.
Other features include a built-in UVLO (Under Voltage Lock Out) circuit whose threshold is 1.4V(typ); The XCL201/02 will stop operating when the input voltage decreases below this threshold, and will resume normal operation when the input voltage rises above this threshold.

In addition, the XCL201/02 features a current limiter that not only stops the IC when the output current is too high, but also permits the IC to automatically resume normal operation (following a soft-start procedure) as soon as the over-current condition disappears.

The XCL201/02 series is available now with samples and populated EVB ready for use upon request.