INA240: smaller device alternative

Kelvin, 

Where in the design is the customer implementing the device? Are they performing high side, low side, or in line sensing? This will have a lot of bearing on potential alternate recommendations. That said, the INA240 is going to be hard to beat in this space. Given the frequency of the PWM signal, assuming this in inline sensing, I would recommend looking at INA293. This maintains a common voltage down to -4V, so the part can handle any inductive kickback, and the full signal BW of the device is over 1MHz, so they should be able to maintain good signal integrity over the whole PWM signal. A few tradeoffs here though: the INA293 does not have PWM rejection as the INA240 does, and the INA293 loses some small amount of bandwidth at very small signal magnitudes, so there may be some distortion at the signal minimum, based on the magnitudes of their waveforms. 

The INA293 comes in SOT 23-5 package, so is much smaller than the TSSOP-14 of the iNA240.