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0.8A step-up DC/DC converters target healthcare devices

26 Apr 2016

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Torex Semiconductor Ltd has introduced the XC9141/XC9142 series of 0.8A step-up DC/DC converters with a load disconnection function. According to the company, the devices are intended for home healthcare and wearable devices that necessitate space saving, advanced functionality and high efficiency.

Comparison of mounting area with previous product

Figure 1: Comparison of mounting area with previous product

The demand for internal-driver, step-up DC/DC converters 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 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.

XC9141/XC9142 series

Figure 2: XC9141/XC9142 series, small package, WLP-6-01

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 100Ω, enabling use in devices driven by one alkaline or nickel-hydrogen battery. The input voltage range is 0.65V to 6V, and the output voltage range can be set from 1.8V to 5.5V (accuracy ±2 per cent) in steps of 0.1V. A switching frequency of 1.2MHz or 3MHz 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, and output short protection. The SOT-25 package, small USP-6C package (1.8mm x 2mm x 0.6mm), and ultra-small WLP-6-01 package (1.28mm x 1.08mm x 0.4mm) are available to match the application.

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