Category: Hardware
Product Number: MAX77757
Hello,
I am using the MAX77757HEFG360+ as a LiFePO4 charger in a recent design.
The fast charge current limit is set to maximum with the IFAST resistor.
The power input and USB D+, D-, CC pins go to a USB-C connector.
1. When I tried to charge the battery, for the first few times the MAX77757 was setting the limit as described in the datasheet.
For power sources with no USB pins it was setting ~3A, but later it stopped setting 3A and is stuck to 0.5A.
For a while it responded to a strap (200R) between D+, D- and set 1.5A. Then it stopped doing this too.
2. A second example works at 3A, but has stopped responding to the D+/D- strap.
It still responds to USB signaling from USB sources, for now...
Any idea what I may be doing wrong?
Thank you,
George
