MAX77751

3.15A USB-C Autonomous Charger

for 1-Cell Li+ Batteries

www.maximintegrated.com

Maxim Integrated | 36

Non-USB Type Power Source

In an application where the power source is not USB, all the USB related pins such as CC1, CC2, DP, and DN should be

left not connected (NC). In this case, the input current to the MAX77751 is limited to 3A.

Recommended PCB Layout and Routing

BATT as close as possible to the IC to provide accurate battery voltage sensing. Provide a large copper ground plane to

allow the PGND pad to sink heat away from the device. Use wide and short traces for high current connections such as

CHGIN, BYP, SYS, and BATT to minimize voltage drops. The MAX77751 has two kinds of ground pins: PGND and GND.

Carefully connect PGND because it is a switching node ground of the Charger Buck. It should be tied to ground of the

SYS and BYP capacitors and connected to the ground plane directly without sharing other ground. The GND can be

connected to the ground plane.

Figure 14 is a recommended placement and layout guide.

Figure 14. Recommended Placement and Layout