7.1 Overview

The TPS720 belongs to a family of new generation LDO regulators that use innovative circuitry to achieve ultra-wide bandwidth and high loop gain, resulting in extremely high PSRR (up to 1 MHz) at very low headroom (V_IN – V_OUT). The implementation of the BIAS pin on the TPS720 vastly improves efficiency of low V_OUT applications by allowing the use of a preregulated, low-voltage input supply. The TPS720 supports a novel feature in which the output of the LDO regulates under light loads (<500 μA) when the IN pin is left floating. The light-load drive current is sourced from V_BIAS under this condition. This feature is particularly useful in power-saving applications where the DC-DC converter connected to the IN pin is disabled but the LDO is still required to regulate the voltage to a light load. These features, combined with low noise, low ground pin current, and ultra-small packaging, make this device ideal for portable applications. This family of regulators offers sub-bandgap output voltages, current limit and thermal protection, and is fully specified from –40°C to 125°C.