SNVSCC4 October 2023 LP5811
PRODUCTION DATA
When the input voltage is above the UVLO rising threshold 1.8 V and the EN pin is pulled to a voltage above 1.2 V, the boost of LP5811 is enabled and starts up. At the beginning, the LP5811 charges the boost output capacitor with a constant current when the output voltage is below 0.4 V. When the output voltage is charged above 0.4 V, the LP5811 has capability to drive 200 mA load. After the output voltage reaches the input voltage, the boost of LP5811 starts switching, and the output voltage continually ramps up to default voltage 3 V. The typical start-up time is 450 μs from EN pulled high to output reaching default voltage 3 V, at the application that input voltage is 2.5 V, output effective capacitance is 10 μF, and no load. When the EN is below 0.42 V, the internal enable comparator turns the device into shutdown mode. In the shutdown mode, the device is entirely turned off and the output is disconnected from input power supply.