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TPS63001: Becomes hot

Part Number: TPS63001


 I am using the TPS63001 to supply my system. The input voltage to the module comes from a battery charger IC that, under operating conditions provides the battery voltage to the buck-boost. The TPS63001 becomes very hot, especially when the battery voltage drops below 3.3V. What could be the cause? I attach schematic and layout.

R2 is a 120 Ohm resuistor, since I had this one.

The enable signal comes from a slide switch that swithces the EN voltage between GND and Vsys.