ZHCSE16C July 2015 – November 2017 LM43600-Q1
PRODUCTION DATA.
The undervoltage lockout (UVLO) is adjusted using the external voltage divider network of RENT and RENB. RENT is connected between VIN and the EN pin of the LM43600-Q1 device. RENB is connected between the EN pin and the GND pin. The UVLO has two thresholds, one for power up when the input voltage is rising and one for power down or brown outs when the input voltage is falling. The following equation can be used to determine the VIN (UVLO) level.
The EN rising threshold for LM43600-Q1 is set to be 2.2 V. Choose the value of RENB to be 1 MΩ to minimize input current going into the converter. If the desired VIN (UVLO) level is at 3.5 V, then the value of RENT can be calculated using the equation above and yield a value of 590 kΩ.