MPQ4485

– STEP-DOWN CONVERTER WITH DUAL USB CHARGING PORTS

MPQ4485 Rev.1.0

www.MonolithicPower.com

11

9/18/2017

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© 2017 MPS. All Rights Reserved.

PIN FUNCTIONS

QFN 5x5

Pin #

Name

Description

1

CC1

Configuration channel. CC1 is used to detect connections and configure the

interface across the USB1 Type-C cables and connectors. Once a connection is

established, CC1 or CC2 is reassigned to provide power over the VCONN pin of

the plug.

2

USB1

USB1 output.

3, 15, 25

OUT

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

4, 14

IN

Supply voltage. IN is the drain of the internal power device and provides power to

the entire chip. The MPQ4485 operates from a 6V to 36V input voltage. The input

the IC as possible.

5, 13

PGND

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

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

copper traces and vias.

6

AGND

Analog ground. Connect AGND to PGND.

7

VCC

Internal 4.6V LDO regulator output. Decouple VCC with a 0.22µF capacitor.

8, 9, 26

SW

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

10

BST

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

floating supply across the high-side switch driver.

11

POL

Type-C plug orientation indication. When POL is low, CC1 is used as the CC

pin. When POL is high, CC2 is used as the CC pin.

12

MODE

USB2 mode control. Float MODE to set USB2 to DCP mode. Pull MODE low to

set USB2 to CDP mode. MODE has a

1MΩ pull-up resistor to the internal VCC.

16

USB2

USB2 output.

17

DM2_OUT

D- data line output.

18

DP2_OUT

D+ data line output.

19

DM2

D- data line to USB2 connector. DM2 is the input/output used for handshaking

with portable devices.

20

DP2

D+ data line to USB2 connector. DP2 is the input/output used for handshaking

with portable devices.

21

EN

On/off control input. EN has an internal auto pull-up with a 8

μA current source.

22

DP1

D+ data line to USB1 connector. DP1 is the input/output used for handshaking

with portable devices.

23

DM1

D- data line to USB1 connector. DM1 is the input/output used for handshaking

with portable devices.

24

CC2

Configuration channel. CC2 is used to detect connections and configure the

interface across the USB1 Type-C cables and connectors. Once a connection is

established, CC1 or CC2 is reassigned to provide power over the VCONN pin of

the plug.