The XC9131 and XC9135/36 series from Torex are synchronous step-up DC-DC converters that can be used with ceramic capacitors and integrate one P-channel and one N-channel MOS power transistors.

All series are able to start operation from VIN as low as 0.9V (and as high as 5.5V), making them suitable for battery-powered equipment using a single Alkaline or Nickel metal hydride battery.

However, after the start-up procedure has completed, it is worth noting that these series will carry on operating for input voltages decreasing down to 0.65V (or down to the UVLO detect value for the XC9135 series).

The output voltage is selectable between 1.8V and 5.0V. In the case of the XC9135/36 series, this output voltage is set internally and is available in 0.1V increments, whereas the XC9131 series offers the flexibility to adjust the output voltage externally with two resistors.

Like all step-up DC-DC’s, the output current will depend on the (VIN, VOUT) conditions. For example, up to 500mA of output current can be supplied with VIN=1.8V and VOUT=3.3V.

Both devices feature a soft-start circuit, an enable pin to turn the IC on and off, and a load disconnect function that prevents the battery charge from leaking to the output while the IC is not operating.

The XC9131 and XC9135/36 series are available in a small 2.9 x 2.6mm USP-10B package.

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