MP5402M – STEP-DOWN CONVERTER WITH SMART DUAL USB CHARGING PORTS

MP5402M Rev.1.0

www.MonolithicPower.com

13

10/10/2015

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Since the trace resistance is different for

different

cables,

the

MP5402M

provides

selectable line drop compensation through

VDROP. The line drop compensation amplitude

increases linearly as the load current increases;

it also has an upper limitation.

USB Output Over-Voltage Protection

In order to protect the device at the cable

terminal, each USB switch output has an

independently dynamic over-voltage protection

threshold. Based on different USB loading

currents, the MP5402M adjusts the OVP

threshold accordingly.

The intelligent line drop compensation and

dynamic over-voltage protection control scheme

ensure that the voltage at the cable terminal

meets the 4.75V-5.25V specifications.

USB Output Discharge

Each USB portion involves a discharge function

that provides a resistive discharge path for the

external output capacitor. The function is active

when the part is disabled (input voltage is under

UVLO, EN off) and is done in a very limited time.

Auto Detection

The MP5402M integrates the USB dedicated

charging port auto-detect function. This function

recognizes most mainstream portable devices. It

supports the following charging schemes:

•

USB battery charging specification BC1.2/

Chinese

telecommunications

industry

standard YD/T 1591-2009

•

Divider mode

•

1.2V/1.2V mode

The auto-detect function is a state machine that

supports all of the DCP charging schemes above.

SYSTEM

Thermal Shutdown (TSD)

Thermal shutdown prevents the chip from

operating at exceedingly high temperatures.

When the silicon die temperature exceeds 165°C,

the

entire

chip

shuts

down.

When

the

temperature falls below its lower threshold

(145°C, typically), the chip is enabled.