Push Button Load Switch

By adding our Push Button Load Switch between the battery and the main power circuit (which could be an LDO or a DCDC) on the board, or between the battery and the MPU if the MPU is connected directly to the battery without any power circuit, it is possible to completely shut the line from the battery, which in turn stops the battery draining over time.

We call this function “Ship Mode” or “Shutdown Mode” and we estimate that over a period of 6 months in storage, the difference in remaining battery life comparing applications with/without the Load Switch is significant. Our Range of Push Button Load Switches is available in an ultra-small 2.0mm x 2.0mm x 0.33mm USP-8B06 package.

Once the application on which the Load Switch is used has been through final testing following production, the circuit can be put into “Ship Mode” very easily by inputting a single pulse ("H" level) to the Load Switch’s SHDN pin. After several months of storage, a push button signal turns on the switch and the circuit will start-up with a battery that still has enough charge to allow use straight out of the box!

The Load Switch can also be used as a main power switch in place of a mechanical switch. When the power is turned off, usually the MPU should perform an operation to turn off the system safely and securely. After such an operation is completed, the MPU can send a H" level signal to the SHDN pin of the Load Switch to turn off the system. In addition, the XC619xA is equipped with an ON/OFF toggle function that means that the power supply line can be switched on/off by inputting a “L” level signal during a pre-determined time to the SW pin.

With a wider Input Voltage range (1.8V~6.0V) and a lower quiescent current (0.13μA) the XC6193 and the XC6194 are now available for a wider range of applications. The XC6193 also has the option for an External FET allowing for a larger output current. 

To avoid inrush current during start up the XC6193 uses the internal switch between V_IN and V_OUT. Once the voltage has increased to a suitable level, the external MOSFET is turned on. This avoids a large inrush current being drawn from the battery and helps avoid depletion.