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Design Help for 3.6 Vin to 3.8 Vout Boost Power Supply

Category: Datasheet/Specs
Product Number: LTC3112

Good Afternoon,

I need urgent help to validate an existing design that uses LTC3112 to provide 3.8 Vout to power a modem module from nominal 3.6 Vin from a single Lithium battery cell.

We have this circuit operating from 2S1P battery pack (nominal 7.2 Vin) in buck mode, however it appears to have issues when running in boost mode off a single nominal 3.6Vin cell. 

  

Attached is an extract of the existing design.

Any help is appreciated.

95EVO