INPUT VOLTAGE is 27V,and set output to 21V,the result turn out to be 26V,INTVCC is 25.6V,is the chip broken?
LTC3649
Recommended for New Designs
The LTC3649 is a high efficiency 60V, 4A synchronous monolithic step-down regulator. The regulator features a single resistor programmable output voltage...
Datasheet
LTC3649 on Analog.com
INPUT VOLTAGE is 27V,and set output to 21V,the result turn out to be 26V,INTVCC is 25.6V,is the chip broken?
If INTVCC is at 25.6V, then there is likely serious damage to the chip.