ZHCSEI2B January 2016 – June 2021 TPS7A84
PRODUCTION DATA
The device features a bias rail to enable low-input voltage, low-output (LILO) voltage operation by providing power to the internal circuitry of the device. The bias rail is required for operation with VIN < 1.4 V.
An internal power MUX supplies the greater of either the input voltage or the bias voltage to an internal charge pump to power the internal circuitry. Unlike other LDOs that have a bias supply, the TPS7A84 does not have a minimum bias voltage with respect to the input supply because an internal charge pump is used instead.
The internal charge pump multiples the output voltage of the power MUX by a factor of 4 to a maximum of typically 8 V; therefore, using a bias supply with VIN ≤ 2.2 V is recommended for optimal dc and ac performance. Sequencing requirements exist for when the bias rail is used; see the Section 8.1.13 section for more details.