MAX77751

3.15A USB-C Autonomous Charger

for 1-Cell Li+ Batteries

www.maximintegrated.com

Maxim Integrated | 31

Barrel Connectors

When a barrel connector is used in the application, there is no connection to determine the input current limit. Resistors

can be connected to mimic BC1.2 detection and/or CC detection to configure the desired input current limit. If the capacity

of the power source is 500mA, the MAX77751 can set the input current limit to 500mA by configuring resistors on DP/DN

for BC1.2 SDP (Figure 9

). R1 and R2 should have the same resistance with the recommended value of 20kΩ. Meanwhile,

if the capacity of the power source is 1.5A, the MAX77751 can set the input current limit to 1.5A by connecting a resistor

for BC1.2 DCP as shown in Figure 10

. The recommended value of resistor R is 200Ω.

MAX77751

CC2

CC1

DP

DN

CHGIN

BARREL

CONNECTOR

Figure 9. Connections for a Barrel Connector (500mA Power Source)

MAX77751

CC2

CC1

DP

DN

CHGIN

BARREL

CONNECTOR

R

Figure 10. Connections for a Barrel Connector (1.5A Power Source)

Enable Source Role

ENBST = high enables the MAX77751's source role. The MAX77751 disconnects Rd from the CC line and connects an

180μA current source to advertise the 5V/1.5A power source. The MAX77751 enables the reverse boost and supply

5.1V/1.5A through the CHGIN pin.