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TPS61087: TPS61087 SW shorted to GND when high power output

Part Number: TPS61087

Hi,

Recently, I designed a boost circuit which is 5V input, 11.7V/600mA output which using TPS61087.

During testing, the output voltage, SW voltage and the L current is beautiful at 100mA/300mA/600mA output. But when the load goes up to 700mA, the IC broken. SW shorted to Ground. I changed the diode from  BA260A to SL22 which can increase the output power. The output current can achieve to 740mA. But when the load goes high to 750mA, IC broken.

I also tested TPS61087 demo, when the output current 750mA, the IC broken too. Before broken, peak inductor current hasn't catch the MOSFET current limit.

Could you please help me check what the root cause of the broken? Thanks.