For the LF9 SOT-23-5 I have found this:
a) XC6219 Series High Speed LDO Regulators, Low ESR Cap. Compatible, ON/OFF Switch
b) XC9236-C09-DMR
(XC9235/XC9236/XC9237Series) 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
a) XC6219 Series High Speed LDO Regulators, Low ESR Cap. Compatible, ON/OFF Switch
b) XC9236-C09-DMR
(XC9235/XC9236/XC9237Series) 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
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