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BQ24133: BQ24133 heat when charging

Part Number: BQ24133

Hi

The customer design with BQ24133, during charge the chip will hot, if disconnect the battery for load only or disconnect the input power only battery power supply, the temperature is normal.

Other functions are normal. The maximum charging current is set to 1A, the board is 2-layers. The heat dissipation hole under the chip is connected to the thermal pad.

The surface temperature of the chip was probably tested with a thermocouple, and it was probably 50°C at the hottest time.

How to increase heat dissipation?

Thnaks

Star