MPQ4487 – STEP-DOWN CONVERTER WITH DUAL USB CHARGING PORTS, AEC-Q100

MPQ4487 Rev.1.0

www.MonolithicPower.com

11

10/17/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 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

5, 13

PGND

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

requires careful consideration during the PCB layout. Connect PGND 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 1µF capacitor.

8, 9, 26

SW

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

10

BST

Bootstrap. A 0.22µF capacitor is connected between SW and BST to form a floating

supply across the high-side switch driver.

11

OUT_SEL

Buck output voltage set. By setting OUT_SEL to low, float, or high, three different

output voltages can be achieved: 5.1V, 5.17V, or 5.3V.

12

FREQ

Switching frequency program input. For the MPQ4487GU-AEC1, connect a resistor

from FREQ to GND to set the switching frequency. Float FREQ or connect FREQ to

VCC for the default 450kHz frequency. Connect FREQ to ground for a 250kHz internal

frequency.

For the MPQ4487GU-FD-AEC1, float FREQ or connect FREQ to VCC to achieve a

±10% frequency spread spectrum based on 450kHz. Connect a resistor from FREQ to

GND or pull FREQ to GND to set the switching frequency without a frequency spread

spectrum.

16

USB2

USB2 output.

17

CC4

Configuration channel. CC4 is used to detect connections and configure the interface

across the USB2 Type-C cables and connectors. Once a connection is established,

CC3 or CC4 is reassigned to provide power over the VCONN pin of the plug.

18

CC3

Configuration channel. CC3 is used to detect connections and configure the interface

across the USB2 Type-C cables and connectors. Once a connection is established,

CC3 or CC4 is reassigned to provide power over the VCONN pin of the plug.

19

FLT2

USB2 fault indication. FLT2 indicates over-current or over-temperature conditions.

FLT2 is an open drain in normal conditions. Pull FLT2 low during fault conditions.

20

EN2

USB2 on/off control input. By default, EN2 is pulled low by an internal 1MΩ resistor.

21

EN

On/off control of the entire chip. Pull EN down to ground internally with a 2MΩ

resistor.

22

EN1

USB1 on/off control input. By default, EN1 is pulled low by an internal 1MΩ resistor.

23

FLT1

USB1 fault indication. FLT1 indicates over-current or over-temperature conditions.

FLT1 is an open drain in normal conditions. Pull FLT1 low during fault conditions.

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.