MP5408 – 36V, 6A, STEP-DOWN CONVERTER W/ DUAL USB CHARGING PORTS
PIN FUNCTIONS
QFN 5x5
Pin #
Name
Description
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.
1
CC1
2
USB1
OUT
USB1 output.
3, 15, 25
Buck output. OUT is the power input for USB1 and USB2.
Supply voltage. IN is the drain of the internal power device and provides power to the
entire chip. The MP5408 operates from a 6V to 36V input voltage. The input capacitor
(CIN) prevents large voltage spikes at the input. Place CIN as close to the IC as
possible.
4, 14
IN
Power ground. PGND is the reference ground of the regulated output voltage. PGND
5, 13
PGND requires extra care during the PCB layout. Connect PGND with copper traces and
vias.
6
7
AGND Analog ground. Connect AGND to PGND.
VCC
SW
Internal 4.5V LDO regulator output. Decouple VCC with a 1µF capacitor.
Switch output. Use a wide PCB trace to make the connection.
8, 9, 26
Bootstrap. Connect a 0.22µF capacitor between SW and BST to form a floating
supply across the high-side switch driver.
10
11
BST
Buck output voltage set. By setting OUT_SEL to low, floating, or high, three different
output voltages can be achieved: 5.1V, 5.17V, or 5.3V.
OUT_SEL
Switching frequency program input. Connect a resistor from FREQ to GND to set
12
16
FREQ the switching frequency. Float FREQ or connect FREQ to VCC for the default 450kHz
frequency. Connect FREQ to ground for a 235kHz internal frequency.
USB2
USB2 output.
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.
17
CC4
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.
18
19
CC3
DM2
D- data line to USB2 connector. DM2 is the input/output used for handshaking with
portable devices.
D+ data line to USB2 connector. DP2 is the input/output used for handshaking with
portable devices.
20
21
22
DP2
EN
On/off control input. EN has an internal auto pull-up with an 8µA current source.
D+ data line to USB1 connector. DP1 is the input/output used for handshaking with
portable devices.
DP1
D- data line to USB1 connector. DM1 is the input/output used for handshaking with
portable devices.
23
24
DM1
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.
ABSOLUTE MAXIMUM RATINGS (1)
Supply voltage (VIN) .....................................40V
VSW................................... -0.3V (-5V for <10ns)
to VIN + 0.3V (43V for <10ns)
MP5408 Rev. 1.0
9/15/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
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