TPS2549 Datasheet, PDF (19/42 Pages) Texas Instruments – USB Charging Port Controller and Power Switch With Cable Compensation

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TPS2549
SLUSCP2 – SEPTEMBER 2016
8.3.5 Port Power Management (PPM)
PPM is the intelligent and dynamic allocation of power. PPM is for systems that have multiple charging ports but
cannot power them all simultaneously.
8.3.5.1 Benefits of PPM
The benefits of PPM include the following:
• Delivers better user experience
• Prevents overloading of system power supply
• Allows for dynamic power limits based on system state
• Allows every port to potentially be a high-power charging port
• Allows for smaller power-supply capacity because loading is controlled
8.3.5.2 PPM Details
All ports are allowed to broadcast high-current charging. The current-limit is based on ILIM_HI. The system
monitors the STATUS pin to see when high-current loads are present. Once the allowed number of ports asserts
STATUS, the remaining ports are toggled to a non-charging port. The non-charging port current-limit is based on
the ILIM_LO setting. The non-charging ports are automatically toggled back to charging ports when a charging
port de-asserts STATUS.
STATUS asserts in a charging port when the load current is above ILIM_LO + 40 mA for 210 ms (typical).
STATUS de-asserts in a charging-port when the load current is below ILIM_LO – 10 mA for 3 seconds (typical).
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