ZHCSL19C May 2019 – June 2021 LM61440
PRODUCTION DATA
The VCC pin is the output of the internal LDO used to supply the control circuits of the LM61440. The nominal output is 3 V to 3.3 V. The BIAS pin is the input to the internal LDO. This input can be connected to VOUT to provide the lowest possible input supply current. If the BIAS voltage is less than 3.1 V, VIN1 and VIN2 directly powers the internal LDO.
To prevent unsafe operation, VCC has a UVLO that prevents switching if the internal voltage is too low. See VCC_UVLO and VCC_UVLO_HYST in Section 7.5. Note that these UVLO values and the dropout of the LDO are used to derive minimum VIN_OPERATE and VIN_OPERATE_H values.