The UVLO circuit prevents the device from malfunctioning at low input voltage and the battery from excessive discharge. The TPS61088 has both VIN UVLO function and VCC UVLO function. It disables the device from switching when the falling voltage at the VIN pin trips the UVLO threshold V_{IN_UVLO} , which is typically 2.4 V. The device starts operating when the rising voltage at the VIN pin is 200 mV above V_{IN_UVLO}. It also disables the device when the falling voltage at the VCC pin trips the UVLO threshold V_{CC_UVLO}, which is typically 2.1 V.