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1/18/2017

2016-11-0004

PT0493-4

25

PI5USB2546

Implementing PPM in a System with Two Charging Ports

Below shows the implementation of two charging ports and each port with its own PI5USB2546. In this example 5V power supply

for the two charging ports is rated at <3A or <15W max. Both devices have RLIM chosen to correspond to the low (0.9A) and

high (1.5A) current limit setting for the port. In this implementation the system can support only one of the two ports at 1.5A

Figure 10, Implementing Port Power Management in a System Supporting Two Charging Ports

IN

STATUS

FAULT

5V

EN

CTL1

CTL2

CTL3

ILIM_SEL

PI5USB2546

OUT

DM_IN

DP_IN

GND

ILIM_LO

ILIM_HI

S0-S3

48.7k

(0.9A)

29.8k (1.5A)

IN

STATUS

FAULT

EN

CTL1

CTL2

CTL3

ILIM_SEL

OUT

DM_IN

DP_IN

GND

ILIM_LO

ILIM_HI

48.7k

(0.9A)

29.8k (1.5A)

USBPort 1

USBPort 2

100k

100k

EN 1

FAULT 1

5V

EN 2

FAULT 2