MP5026

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

MP5026 Rev. 1.0

MonolithicPower.com

16

7/5/2023

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© 2023 MPS. All Rights Reserved.

EN/UV and LOADEN

The EN/UV and LOADEN pins control the

MP5026

’s on and off status (see Table 1).

During the LOADEN blanking time, EN/UV high

is sufficient to turn the MOSFET on. After the

LOADEN blanking time expires, EN/UV and

LOADEN must be pulled high to turn the device

on. Pull EN/UV low to turn the MOSFET off.

Cycle the power on EN/UV or VIN to restart the

chip once it is latched off.

Table 1: EN/UV and LOADEN Blanking Time

Is the LOADEN

Blanking Time

Complete?

EN/UV

LOADEN

Status

No

0

0

Off

No

0

1

Off

No

1

0

On

No

1

1

On

Yes

0

0

Off

Yes

0

1

Off

Yes

1

0

Off

Yes

1

1

On

Note that LOADEN shuts down the power

MOSFET after the LOADEN blanking time

finishes. However, LOADEN cannot turn the

power MOSFET on by cycling the power on

LOADEN only (see Figure 3).

Power

MOSFET

LOADEN

ENTM

EN/UV

Off

On

1.21V

t

Figure 3: EN/UV and LOADEN Timing Diagram

If VIN and VCC are ready when the part is

enabled, the internal 24

μA current source

charges the power MOSFET

’s gate. It takes

about 1ms to charge VGS to its threshold. Then

VOUT rises based on the SS-controlled slew rate.

LOADEN Blanking Time

LOADEN has a configurable blanking time that

prevents the pin from de-asserting during the

blanking time (see Figure 4).

LOADEN Blanking Time

EN/UV

LOADEN

ENTM

1.21V

VOUT

VIN

Figure 4: LOADEN Blanking Time

Since all fault functionalities are operative

during start-up, the power MOSFET shuts down

if a fault is detected. However, LOADEN going

low during this blanking time does not turn the

MOSFET off. At the end of the blanking time,

LOADEN operates normally.

The LOADEN blanking time (tLDNB) can be set

by a capacitor placed at the ENTM pin. The

LOADEN blanking time capacitor (CENTM) can

be calculated with Equation (3):

=

ENTM

LDNB

1.1

C(

μF)

t

(s)

1.24

(3)

For example, a 1

μF capacitor requires a 1.13s

tLDNB. If LOADEN is not used, connect ENTM to

GND.

Over-Current Protection (OCP)

The MP5026 provides a constant current limit

that can be configured via an external resistor.

The Intelli-Fuse over-current limit (ILIMIT) is a

function of the ISET resistor (RISET). ILIMIT can be

calculated with Equation (4):

3

LIMIT

ISET

0.3V

I

(A) =

10

R

(k

Ω)



(4)

If VOUT is below the larger value between VIN -

0.5V and 80% of VIN, then the MP5026 enters

start-up. To protect the device from overheating

during start-up, ILIMIT has a 20A internal current

limit clamp. The actual start-up current limit

(ILIMIT_SS) is the smaller value between ILIMIT and

20A (see Figure 5 on page 17).