Figure 1 shows an ultra-low-power, precision undervoltage-lockout circuit. The circuit monitors the voltage of a Li-Ion battery, disconnecting the load to protect the battery from deep discharge when the battery voltage drops below the lockout voltage. Storing a battery-powered product in a discharged state while the battery is low puts the battery at risk of being completely discharged. During the discharged state, current to the protection circuitry also discharges the battery. If the battery discharges below the recommended end-of-discharge voltage, the battery performance degrades, cycle life shortens, and the battery dies prematurely. In contrast, if the lockout voltage is set too high, the maximum battery capacity isn't realized.
展开▼
