Datasheet

Embedded

Controller

/Status

Status

Charging Port

2543

CTL/ILIM

Notebook MB

HDD

Charging Port

Port draws > Load detect setting

1. S3 DCP-Auto/S0 CDP

2. Force to SDP mode

TPS2543

www.ti.com

SLVSBA6 –FEBRUARY 2012

Port Power Management

Port power management is for systems that have multiple charging ports but cannot power them all

simultaneously. Goal of this feature is two fold:

1. Enhances user experience since user does not have to search for charging port

2. Power supply only has to be designed for a reasonable charging load

All ports are allowed to broadcast high current charging, charging current limit is based on ILIM_HI resistor

setting. System monitors STATUS to see when high current loads are present. Once allowed number of ports

assert STATUS, remaining ports are toggled to a non-charging port. Non-charging ports are SDP ports with

current limit based on ILIM_LO. TPS2543 allows for a system to toggle between charging and non-charging ports

either with an OUT discharge or without an OUT discharge.

Figure 33. Implementing Port Power Management in a System Supporting Two Charging Ports

Over-Current Protection

When an over-current condition is detected, the device maintains a constant output current and reduces the

output voltage accordingly. Two possible overload conditions can occur. In the first condition, the output has

been shorted before the device is enabled or before VIN has been applied. The TPS2543 senses the short and

immediately switches into a constant-current output. In the second condition, a short or an overload occurs while

the device is enabled. At the instant the overload occurs, high currents may flow for nominally one to two

microseconds before the current-limit circuit can react. The device operates in constant-current mode after the

current-limit circuit has responded. Complete shutdown occurs only if the fault is present long enough to activate

thermal limiting. The device will remain off until the junction temperature cools approximately 20°C and will then

re-start. The device will continue to cycle on/off until the over-current condition is removed.

Product Folder Link(s): TPS2543