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LM3643: alternative device for LM3648TT

Part Number: LM3643
Other Parts Discussed in Thread: LM3648, LM36010

Hi Sir,

We knew the LM3643 and LM3648 both have same I2C address= 0x63.
My customer and I are trying to figure out the differences between the LM3643 and LM3648TT.
They have ever used the LM3643, and the new product spec only uses the LED-1 channel and under 500mA, could both devices be alternative devices for each other?
Are there any design guidelines we need to pay attention to?