The L version is the one you need. It's output goes high on undervoltage battery condition and turns off the P-Chan MOSFET.
4 OUT (“N” Version) Output: Active-high, open-drain output. This output is de-asserted when
VINP< VREF, indicating a low voltage input. The output is asserted when
VINP> VREF+ VHYST.
OUT (“H” Version) Output: Push-pull output. This output is de-asserted and latched when
VINP < VREF, indicating a low voltage condition. This state remains latched
until VINP > VREF+ VHYST.
OUT (“L” Version) Output: Push-pull output. This output is asserted and latched when
VINP < VREF, indicating a low voltage condition. This state remains latched
until VINP > VREF+ VHYST.
5 VDD Power Supply (Input): Independent supply input for internal circuitry.