MP5990 datasheet(21/72 Pages) MPS

21 / 72 page

MP5990

– 16V, 50A, 1mΩ, INTELLIGENT HOT-SWAP SOLUTION WITH PMBUS

MP5990 Rev. 1.1

MonolithicPower.com

4/19/2024

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

Figure 5 shows the start-up sequence in LPM.

In LPM, ADVANCE_CTRL (F1h), bit[13] selects

whether the device should enter the optional

MTP copying mode or initiate the system

initialization delay time after EN pulls high. If

bit[13] is set to 0, then the MP5990 starts

TON_DELAY

after

goes

high.

This

sequence is different from regular power mode.

VDD33 UVLO On

POR + MTP Copying +

System Initialization

Wait EN On

TON_DELAY

VIN

E-Fuse Insertion

Delay

340mV

SCREF

OCWREF

VDD33

VDD18

SCREF/

OCWREF

OCREF

GATE

VOUT

GOK

VGS_TH

MTP Copying + System

Initialization

(Optional)

Figure 5: Start-Up Sequence in Low-Power Mode

Current-Sense Output (CS)

The CS pin provides a current proportional to

IOUT flowing through the device. VCS is used for

over-current

(OC)

limiting,

warning

indication, and parallel operation with start-up

current balancing. The current-sense gain is

10μA/A while the MOSFET is fully on. A resistor

(RCS) on the CS pin generates VCS. ICS can be

estimated with Equation (2):

OUT

I = I

10 A/A

 μ

(2)

VCS can be calculated with Equation (3):

= I



(3)

Once VCS reaches VOCREF, the internal circuit

regulates VGATE to maintain a constant IFET.

Output Current Monitor (IMON)

The

MP5990

provides

high-accuracy

MOSFET current monitor output (IMON). The

current monitor gain is 10

μA/A. Connect a

resistor (RIMON) between the IMON and GND

pins. The recommended IMON voltage (VIMON)

range is 0V to 1.6V, which is also within the

internal

ADC-sensing

limit.

IMON

can

estimated with Equation (4):



IMON

OUT

= I

10 A/A

(4)

VIMON can be calculated with Equation (5):



IMON

= I

(5)

If there is no bandwidth requirement, place a

2.2nF to 100nF capacitor from IMON to GND to

smooth the indicator voltage.

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