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BQ25306: BQ25306 can not charge

Part Number: BQ25306

Hi

The customer design the schematic to charge 2 series battery, charging voltage 8.4V/0.5A

Attached the schematic and inductance information.

Power-on test, when the battery is not inserted, the charger output is about 3.4V, SW output high.

When the battery is inserted, the charger output voltage fluctuates with SW.

When SW is turned on, the output voltage is about 8.4v. The SW waveform is as follows (the switch is turned on, the switching frequency is 1.2mhz, which is the same as the manual description), but the battery is not charged .

Please give some suggestions.

Thanks

Star