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TPS61087: Voltage Dip occuring with increased load

Part Number: TPS61087


We are using the part TPS61087 in our design for a 5V to 12V boost converter with a current limit of around 1A. But, whenever we are trying to increase the load greater than 300mA, we are observing a voltage drop in the 12V rail (dropped to 7V for 8ms).

The 5V input can source up to 3A.

Please comment how to resolve this

Thanks in advance