resistor selection for TPS3700DDCR undervoltage circuit
You can double check your resistor values by using the simulation tool (Tine TI) from Texas Instrument. Here you can download a circuit similar to yours and adjust it accordingly.
Unless I understood it wrong, you are trying to design a window comparator, meaning that the boost converter will be enable if \$3V&lt;V_{DD}&lt;4.3V\$. Right now you are not making use of the overvoltage comparator (OUTB is disconnected), thus only the undervoltage feature is active. I modified the your resistor values and the output connection in order to turn on the boost gate when:
Ramp up: \$3.2V &lt; V_{DD} &lt; 4.34\$
Ramp down: \$2.84V &lt; V_{DD} &lt; 3.94\$