At electronica (Hall A6, Stand 280) Torex will introduce it’s first ever PFM-only step-down DC/DC converter that has been developed specifically for ultra low power applications.
The new XC9265 series consumes only 0.5µA during operation making it ideal for applications that run from batteries for long periods of time. This ultra low quiescent current is achieved by implementing a synchronous PFM architecture to minimize the switching losses during low loads.
Developed using Torex’s proprietary CMOS process, the XC9265 integrates a 0.5Ω P-ch driver transistor and a 0.5Ω synchronous N-ch switching transistor to ensure high levels of efficiency and superior performance for demanding battery powered applications.
Only an inductor and two ceramic capacitors are needed externally and the XC9265 is able to operate from 6.0V down to inputs as low as 2.0V to help further maximise battery life in portable applications.
The output voltage is set internally between 1.0V to 4.0V (±2%) in 0.1V increments. The XC9265 series also features a soft-start circuit, an enable pin to turn the IC on and off and an optional CL discharge function that can quickly discharge the output capacitor when the IC is turned off. During stand-by, all circuits are shutdown to reduce consumption to less than 0.1μA.
An optional UVLO function can also be used to reduce the leakage of potassium hydroxide from small batteries by stopping IC operation while battery voltage is declining. The standard release voltage of UVLO is 1.75V (±3.0%) and selectable voltages range from 1.6V~2.7V in 0.1V steps.
The XC9265 will be available in the USP-6EL package for applications that require a small form factor or in the industry standard SOT-25 package. Additionally, fully populated EVBs can be provided upon request.