This power ic is packaged in a way that looks like a Tape and Reel. Please refer to power management for TSOT functions. Power managment ic pin count is 8. Normally, the supply voltage (Vsup) for this PMIC should not be lower than 500mV. There should be no more than 6V volts of supply voltage (Vsup) in this power management.
LTC2909ITS8-2.5#TRM Features
Minimum supply voltage of 500mV
LTC2909ITS8-2.5#TRM Applications
There are a lot of Analog Devices, Inc. LTC2909ITS8-2.5#TRM Voltage Supervisors applications.