Ultra-small 0.8A step-up DC/DC converters with load disconnection function

Apr 22, 2016

Torex Semiconductor Ltd. (Tokyo Japan: President, Koji Shibamiya, 6616: 2nd section at Tokyo Stock Exchange) 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 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 line-ups and the high efficiency that enables long battery life. A market needs step-up DC/DC converters that save space and have advanced functionality.

The newly launched XC9141/XC9142 series of 0.8A step-up DC/DC converters with a load disconnection function are ideal power ICs 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 h0.4mm)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 100Ω, 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*, and output short protection. (*The integral latch type is currently under development)  The SOT-25 package, small USP-6C package (1.8 x 2.0 x h0.6mm), and ultra-small WLP-6-01 package (1.28 x 1.08 x h0.4mm) are available to match the application.

Torex will continue to swiftly develop products that meet market needs and contribute to a richer and more abundant society.

Comparison of mounting area with previous product

XC9141/XC9142 Series WLP-6-01(1.28 x 1.08 x h0.4mm)

XC9141/XC9142 Series Features

  • A synchronous rectification function is incorporated in the SOT-25, USP-6C, and WLP-6-01
  • A high 3MHz switching frequency can be selected
  • PFM/PWM auto switching achieves high efficiency at light loads
  • Bypass switch and load disconnection functions are available

See details of XC9141 Series
See details of XC9142 Series