Torex Semiconductor increases output current in step-up DC/DC converters 

Torex Semiconductor has expanded its range of 1.4A step-up DC/DC converters. The XC9147 / XC9148 series of synchronous step-up DC/DC converters have a typical resistance of 0.17 Ohm (typical) for the N-channel driver FET and a 0.2 Ohm (typical) synchronous P-channel switching FET. The DC/DC converters are able to start operation from an input voltage of 0.9V, making them suitable for equipment using single alkaline battery or nickel metal hydride battery. The output voltage range is 1.8 to 5.5V and can be set in 0.1V increments. They achieve 1.5 times the output current compared to previous products in the same size package, says the company. 

There are three standby mode functions to further reduce the power consumption of IC-equipped devices and to extend battery life.

 Within the series, the A / D / G / J models have load disconnection and CL discharge functions to reduce the output voltage at a high speed and minimise the risk of the output device malfunctioning. 

The B / E / H / K models correspond to a large range of working voltages such as microcomputers. In the standby state, the input and output are conducted by the bypass function, the battery voltage is supplied as it is, and the subsequent device is driven. Boosting only when a constant voltage, such as 3.3V, is required helps to reduce overall power consumption. 

The C / F / M / L types are suitable for parallel connection (OR connection) of multiple power supplies and back ups. The load disconnection function cuts off the continuity between the input and output, and also makes an OR connection to the output with other power supplies. In addition, it supports automatic switching with other power supplies connected by OR during operation. 

The G / H / M / J / K /L devices in the series are equipped an under-voltage lockout (UVLO) function, which can stop IC operation when the battery voltage is too low. This can reduce the leakage of alkaline batteries. The UVLO detection voltage is 1.46V. 

Torex Semiconductor produces CMOS power management ICs for battery powered and energy efficient applications. Torex specialises in CMOS analogue technology, with LDO voltage regulators, voltage detectors and DC/DC converters.

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