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TPS61092 not boosting

Other Parts Discussed in Thread: TPS61092

Hi,

I am using the TPS61092 in a simple boost application (see attached schematic) but when I power the system and vary the input voltage from 1.9V to 5V the output tracks along with it (it has about a 300mV offset, Vin = 1.9V Vout = 2.2V) till Vin reaches 4.3V and then the output jumps to 5V. The circuit seems simple enough and I am sure I am missing something 

4617.4454.TPS61092-Schematic.pdf