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

MP5402M Rev.1.0

www.MonolithicPower.com

9

10/10/2015

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PIN FUNCTIONS

QFN 4x4

Pin #

Name

Description

1, 2

USB1

USB1 output.

3, 15, 25

OUT

Buck output. OUT is the power input for USB1 and USB2. The internal circuit

senses OUT voltage and regulates it at 5V.

4, 14

IN

possible. IN is the drain of the internal power device and also provides the

power supply for the entire chip.

5, 6, 12, 13

PGND

Power ground. PGND is the reference ground of the regulated output voltage.

PGND requires extra care during PCB layout. Connect to GND with copper

traces and vias.

7

FREQ

Frequency selection. Floating FREQ sets the frequency at 150kHz. Pulling

FREQ to ground sets the frequency at 250kHz. Pulling FREQ to 5V sets the

frequency at 350kHz.

8

EN

On/off control input.

9, 10, 26

SW

Switch output. Use a wide PCB trace to make the connection.

11

BST

Bootstrap. A 0.1μF capacitor is connected between SW and BST to form a

floating supply across the high-side switch driver.

16, 17

USB2

USB2 output.

18

AGND

Analog ground. Connect AGND to PGND.

19

VCC

Internal 5V LDO regulator output. Decouple with a 0.22µF capacitor.

20

VDROP

Line drop compensation selection. Refer to the EC table for detailed

specifications.

21

DM2

D- data line to USB connector. Input/output is used for handshaking with

portable devices.

22

DP2

D+ data line to USB connector. Input/output is used for handshaking with

portable devices.

23

DP1

D+ data line to USB connector. Input/output used for handshaking with

portable devices.

24

DM1

D- data line to USB connector. Input/output is used for handshaking with

portable devices.