Torex Semiconductor Ltd. has launched the XC9141/XC9142 series of 0.8A step-up dc-dc converters with a load disconnection function. The demand for internal-driver step-up dc-dc converters with synchronous rectification in a small package for use in portable devices has been increasing in recent years. There is also an increasing demand for products equipped with an input-output disconnection function (load disconnection function) to prevent malfunctioning during standby, and for device functionality that enables power supply to the RTC.
Furthermore, there is a significant need for space-saving and the demand for small package lineups and the high efficiency that enables long battery life. The newly launched XC9141/XC9142 series of 0.8A step-up dc-dc converters with a load disconnection function are designed for home healthcare and wearable devices that require space saving, advanced functionality, and high efficiency. The ultra-small WLP-6-01 package (1.28 x 1.08 x 0.4mm) makes a further contribution to space-saving design.
Reduction of the on-resistance of the internal transistor enables high-efficiency supply of a stable current up to 0.8A. When the output voltage is 3.3V, the IC can start from an input voltage of 0.9V with a resistance load of 100Î©, enabling use in devices driven by one alkaline or nickel-hydrogen battery. The input voltage range is 0.65V to 6.0V, and the output voltage range can be set from 1.8V to 5.5V (accuracy ±2.0%) in steps of 0.1V. A switching frequency of 1.2MHz or 3.0MHz can be selected to match the application.
PWM control (XC9141) or PWM/PFM auto switching control (XC9142) can be selected for the operation mode. Internal functions include soft start, load disconnection, CL auto discharge, and a bypass switch function. Internal protective circuits include over-current limiting, integral latch (currently under development), and output short protection.
The SOT-25 package, small USP-6C package (1.8 x 2.0 x 0.6mm), and ultra-small WLP-6-01 package (1.28 x 1.08 x 0.4mm) are available to match the application.