MP5026

– 16V, 20A, 2.8mΩ RDS(ON), HOT-SWAP INTELLI-FUSE SOLUTION

MP5026 Rev. 1.0

MonolithicPower.com

20

7/5/2023

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© 2023 MPS. All Rights Reserved.

APPLICATION INFORMATION

Selecting the Soft-Start Capacitor (CSS)

A capacitor connected to SS (CSS) determines

tSS. VOUT rises at a similar slew rate to the SS

voltage (VSS).

CSS can be calculated with Equation (7):

SS

SS

SS

t (ms)

C (nF) = 9

R (M

Ω)



(7)

Where RSS is 0.89MΩ.

Place a 100nF capacitor between SS and GND

to achieve a 9.9ms tSS.

Selecting the IMON Resistor (RIMON)

The MP5026 can monitor the power MOSFET

current. Connect a resistor (RMON) to ground to

set the output gain.

The IMON current (IMON) can be calculated with

Equation (8):

IMON

FET

I

I

20

μA/A

=

(8)

Where IFET is the current flowing from the power

MOSFET.

The IMON reference voltage (VIMON) can be

determined with Equation (9):

=

IMON

IMON

IMON

V

I

R

(9)

Connect a 2k

Ω resistor between IMON and

GND to achieve a 40mV/A VIMON. Place a

capacitor greater than 10nF between IMON and

GND to smooth the indicator voltage.

Do not float IMON. If not being used, connect

IMON to GND.

To ensure that the internal current-sense circuit

has sufficient headroom, the maximum VIMON

voltage should be below VCC - 1.5V (see Figure

11).

1

1.2

1.4

1.6

1.8

2

2

4

6

8

10

12

14

16

V

IN (V)

Figure 11: Maximum VIMON Range

Selecting the ISET Resistor (RISET)

The

MP5026’s ILIMIT should exceed the normal

maximum

ILOAD, allowing for current-sense

tolerances.

ILIMIT

can

be

calculated

with

Equation (10):

3

LIMIT

ISET

0.3V

I

(A)

10

R

(k

Ω)

=

(10)

Insertion Delay Time and OC Fault Timer

Capacitor (CTMR)

The

MP5026’s TIMER pin provides two

functions: tIDT and tOC.

tIDT can be determined with Equation (11):

=

IDT

TMR

1.21

t

(ms)

C

(nF)

4

(11)

tOC can be determined with Equation (12):

=

OC

TMR

1.21

t

(ms)

C

(nF)

40

(12)

Place a 10nF capacitor between TIMER and

GND to achieve a 3ms tIDT and 300µs tOC.