The XC9140A351MR-G is a switching voltage regulator PFM step-up synchronous DCDC converter manufactured by Torex Semiconductor. It features a wide input voltage range of 2.4 V to 6.0 V, a typical output voltage at VOUT of 3.3 V, a capability of achieving high efficiency up to 97% at 4.2 V IN and 3.3 VOUT, and a low operating current consumption of only 2 µA. It has low standby current of 0.3 µA, low noise output voltage ripple, low output voltage deviation, and low EMI, so it can be used in battery powered applications with high efficiency. The XC9140A351MR-G also has built-in overcurrent protection, open or short circuit protection, over-temperature protection, and protection from output voltage faults. It is packaged in a small 4-pin WDFN package.