SLVSB64I November 2011 – March 2018 TPS65217
The TPS65217x device has two general-purpose load switches that can also be configured as LDOs. As LDOs, they support up to 200 mA (TPS65217B) or 400 mA (TPS65217C and TPS65217D) each, are internally current-limited, and have a maximum dropout voltage of 200 mV at rated output current. These two outputs are configured as LS1 and LS2 load switched in the TPS65217A variant of the device. The on-off state of the load switches (LS1 and LS2) or the LDO regulators (LDO3 and LDO4) is controlled either through the sequencer or the LS1_EN and LS2_EN bits of the ENABLE register. When disabled, both outputs are discharged to ground through a 375-Ω resistor.
Configured as load switches, LS1 and LS2 have a maximum impedance of 650 mΩ. Different from LDO operation, load switches can stay in current limit indefinitely without affecting the internal power-good signal or affecting the other rails.
Excessive power dissipation in the switches may cause thermal shutdown of the device.
Load switch and LDO modes are controlled by the LS1LDO3 and LS2LDO4 bits of the DEFLS1 and DEFLS2 registers.