The UVLO circuit prevents the device from malfunctioning at low input voltage and the battery from excessive discharge. The TPS61288 has both VIN UVLO and VCC UVLO function. It disables the device from switching when the falling voltage at the VIN pin trips the falling UVLO threshold V_UVLO, which is typically 1.9 V. The device starts operating when the rising voltage at the VIN pin trips the rising UVLO threshold typically 2.3 V. 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.