DC/DC converter only needs 2 externally connected capacitors

26th November 2013

Staff Reporter

0 0

Torex have today unveiled a series of high speed transient response 1.5A synchronous step-down Micro DC/DC converters. Packaged in a small 2.5mm x 3.2mm x 1.0mm USP-9B01 package, the XCL213/214 series comes with an integrated inductor and requires only two capacitors connected externally to generate a stable power supply.

The integrated inductor enables designers to minimise EMC emissions and radiated noise, whilst maximising efficiency. Torex’s Constant ON Time architecture, HiSAT-COT, gives the XCL213/214 extremely fast load transient response performance in comparison to standard DC/DC solutions as well as achieving low output voltage ripple.

The XCL213/214 utilises a 3MHz switching frequency. The XCL213 series offers PWM control, whereas the XCL214 series applies automatic PWM/PFM switching control, providing fast response, low ripple, low current consumption (25uA typ.) and high efficiency over the full range of output loads (from light load to heavy load). The operating voltage range is from 2.7V to 5.5V and the output voltage is internally set in a range from 0.8V to 3.6V in increments of 0.05V.

The XCL213/214 series include a 0.3ms (typ.) high speed soft-start function 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. A thermal shutdown circuit is also built in which shuts down the IC when the chip’s temperature reaches 150°C and re-starts it when the temperature drops to 120°C (TYP.) or less.

Other features include a built-in UVLO (Under Voltage Lock Out) circuit whose threshold is 2.0V (typ). The XCL213/214 will stop operating when the input voltage decreases below this threshold, and will resume normal operation when the input voltage rises above this threshold.