DC/DC converter for battery powered applications

25th March 2014
Nat Bowers

Featuring an integrated coil to simplify board layout and minimise any unwanted radiated noise, the XCL101 series step-up micro DC/DC converter has been announced by Torex Semiconductor. Able to start operation from input voltages as low as 0.9V, the XCL101 is suitable for use with single alkaline or nickel metal hydride cells.

The XCL101 contributes to PCB space saving and development time shortening: a stable and efficient power supply circuit can be configured simply by adding just two external ceramic capacitors. Like all step-up DC/DC converters, the output current that the XCL101 can supply will depend on the VIN and VOUT conditions, but up to 100mA of output current can be supplied with VIN=1.8V and VOUT=3.3V and with a VIN=0.9V, more than 50mA is possible.

Output voltage of 1.8-5.0V (±2%) is set internally in 0.1V increments and with a typical quiescent current of only 6.3µA, reducing to 0.1µA during standby, the XCL101 helps to maximise battery life in portable applications. 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).

In addition, a built in inrush current protection circuit suppresses inrush current spikes at start-up which results in a more stable power supply which in turn extends battery life.

The XCL101 is available now and both samples and fully populated evaluation boards can be provided upon request.

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