1A µDC/DC converter with integrated coil minimises radiated noise

The compact XCL219/220 with its simple circuit architecture is suitable to replace inefficient LDO voltage regulators. Designers can look forward to a simplified circuit layout, aided by the integrated coil which reduces the number of external components normally needed to implement this type of DC/DC solution. EMI is further reduced as the smaller circuit layout reduces the need for PCB tracking.

The output voltage can be fixed internally within a range of 0.8-3.6V in 50mV steps with an accuracy of ±2.0%, and a nominal 3.0MHz switching frequency with ±15% tolerance is provided as standard. PWM/PFM switching control provides the XCL220 with fast response, low ripple and high efficiency over the full range of load conditions, whilst the XCL219 operates with fixed frequency PWM control.

The XCL219/220 series include a typical 0.25ms high speed soft-start function for quick turn-on, a chip enable pin to turn the IC on and off and an optional CL discharge function to quickly discharge the output capacitor when the IC is turned off. When the chip’s temperature reaches 150°C, the IC is shut down by the built-in thermal shutdown circuit. The IC is restarted when the temperature drops, typically to 120°C or less.

The XCL219/220 will stop operating when the input voltage decreases below 1.6V, when the UVLO circuit kicks in, and will resume normal operation when the input voltage rises above this threshold.

Fully populated EVBs can be provided upon request, and the XCL219/220 is available in the CL2025 package.