MP3924 datasheet(5/56 Pages) MPS

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MP3924

– QUAD-PORT IEEE 802.3AF/AT PSE CONTROLLER

MP3924 Rev. 1.0

MonolithicPower.com

7/16/2021

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

PIN FUNCTIONS (continued)

Pin #

Name

Description

MP3924 address setting pin. Connect A2 to VCC or DGND to set the lower 4-bit address

bits (Address = 010 A3 A2 A1 A0). The address signal is latched when the device starts up

or is reset. A2 is internally pulled up to VCC through a 50k

Ω resistor (an external 10kΩ

resistor can be added).

MP3924 address setting pin. Connect A3 to VCC or DGND to set the lower 4-bit address

bits (Address = 010 A3 A2 A1 A0). The address signal is latched when the device starts up

or is reset. A3 is internally pulled up to VCC through a 50k

Ω resistor (an external 10kΩ

resistor can also be added).

DGND

Ground of the internal digital and analog circuit.

SGND2

Current sense negative input for port 3 and port 4. Connect SGND2 to the low-side

terminal of the sense resistor. For an accurate current sense, use a Kelvin connection

when connecting SGND2 to the PCB. Connect SGND2 to DGND if not used.

PGND

Ground of input power supply.

VCC

3.3V internal regulator output for analog and digital circuit supply. A minimum 1µF

ceramic capacitor must be placed between VCC and DGND.

PMAX

Maximum loading power setting pin. Connect one resistor from the PMAX pin to DGND

to set the total power capability on all four output ports. The MP3924 limits the total power

on all four ports below this set limit. The PMAX setting signal is latched when the device

starts up or is reset.

VIN

Power supply input for both VCC and output ports. Bypass VIN with at least one

0.1µF/100V ceramic capacitor, placed between VIN and PGND.

SENSE4

Current-sense pin from the high-side sense resistor terminal for port 4. It is

recommended to use a

0.25Ω sense resistor for all applications. For an accurate current

sense, use a Kelvin connection when connecting SENSE4 during PCB layout. Connect

SENSE4 to DGND if not used.

GATE4

MOSFET gate driver for port 4. Float the GATE4 pin if not used.

OUT4

Output voltage sense pin for port 4. Connect OUT4 to the return of the output interface

for detecting, classifying, voltage sensing, and current limit foldback control. Float the

OUT4 pin if not used.

SENSE3

Current-sense pin from the high-side sense resistor terminal for port 3. It is

recommended to use a

0.25Ω sense resistor for all applications. For an accurate current

sense, use a Kelvin connection when connecting SENSE3 during PCB layout. Connect

SENSE3 to DGND if not used.

GATE3

MOSFET gate driver for port 3. Float the GATE3 pin if not used.

OUT3

Output voltage sense pin for port 3. Connect OUT3 to the return of the output interface

for detecting, classifying, voltage sensing, and current limit foldback control. Float the

OUT3 pin if it is not used.

SENSE2

Current-sense pin from the high-side sense resistor terminal for port 2. It is

recommended to use a

0.25Ω sense resistor for all applications. For an accurate current

sense, use a Kelvin connection when connecting SENSE1 during PCB layout. Connect

SENSE1 to DGND if not used.

GATE2

MOSFET gate driver for port 2. Float the GATE2 pin if not used.

OUT2

Output voltage sense pin for port 2. Connect OUT2 to the return of the output interface

for detecting, classifying, voltage sensing, and current limit foldback control. Float the

OUT2 pin if it is not used.

SENSE1

Current-sense pin from the high-side sense resistor terminal for port 1. It is

recommended to use a

0.25Ω sense resistor for all applications. For an accurate current

sense, use a Kelvin connection when connecting SENSE1 during PCB layout. Connect

SENSE1 to DGND if not used.

MP3924 Datasheet(PDF) 5 Page - Monolithic Power Systems

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