Torex Semiconductor has unveiled the next evolution in its Micro-dc-dc family. The XCL201/202 uses the same innovative construction technique as the original XCL205/06 series, whereby a synchronous dc-dc converter IC is embedded within a fully-shielded thin-film power inductor. 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 maximizing efficiency. The XCL201/02 also delivers a very stable output with low peak to peak ripple (<10mV), well suited 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 2.5 x 2 x 1mm, the XCL201/02 needs only two capacitors connected externally to generate a stable power supply. The operating voltage range is from 2 to 6V and the output voltage is internally set in a range from 0.8 to 4V 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, says the company.