Torex Semiconductor Ltd has released a high functionality, 1.4A Step-up DC-DC Converters – XC9147/XC9148 series. The series are synchronous step-up DC-DC converters with a 0.17-Ohm (typ) Nch driver FET and a 0.2-Ohm (typ) synchronous Pch switching FET built-in. The series can start operation from an input voltage of 0.9V, ideal for equipment utilising a single Alkaline or Nickel-metal hydride battery. The output voltage range is 1.8V to 5.5V and may be set in 0.1V increments. In the same size package, this product delivers 1.5 times the output current compared to earlier products. Also, the product can select three kinds of standby mode functions, further lessening the power consumption of IC-equipped devices and extending battery life.
The A/D/G/J types equipped load disconnection and CL discharge functions to decrease the output voltage at high speed to stop the output device from malfunctioning.
The B/E/H/K type corresponds to a broad range of working voltages, including microcomputers. In standby state, the input and output are conducted by the bypass function, the battery voltage is provided as it is, and the following device is driven. Boosting only when a constant voltage such as 3.3V is needed will considerably help decrease overall power consumption.
The C/F/M/L types are excellent for parallel connection (OR connection) of multiple power supplies and backups. The load disconnection function cuts off the continuity within the input and output and also makes an OR connection to the output with other power supplies. Also, it supports automatic switching with other power supplies connected by OR throughout operation.
The G/H/M/J/K/L types equipped UVLO function, which can prevent IC operation when the battery voltage is too low, which can decrease the leakage of alkaline batteries. The UVLO detection voltage is 1.46V.