MP5026

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

MP5026 Rev. 1.0

MonolithicPower.com

18

7/5/2023

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

© 2023 MPS. All Rights Reserved.

Once VGS drops low, the MP5026 attempts to

start up again faster to avoid VIN line transients.

The MOSFET gate is charged by an internal

charge pump. If VGS exceeds VGS_TH, the device

turns on. If the short condition remains, ILOAD is

limited by ILIMIT. The fault timer ramps to 1.21V if

the fault is not removed, and then the MP5026

’s

power MOSFET turns off and FLTB is pulled

low (see Figure 8).

Secondary Current Limit

VOUT

IOUT

VGS

VGS_TH

FLTB

200ns

t

TIMER

1.21V

40µA

Negative voltage

0

0

0

0

0

Figure 8: SCP Behavior

When a hard short occurs and VIN is pulled

below VCC quickly, the power MOSFET gate

voltage is pulled low immediately, regardless of

whether the secondary current limit has been

reached or not. The power MOSFET then

retries once more with the same short-circuit

condition present.

If the short persists after the timer expires,

FLTB switches low.

Over-Voltage Protection (OVP)

The MP5026 provides internal voltage sensing

to monitor VIN. Connect a resistor divider

between the VIN and AGND pins to set the

input over-voltage (OV) threshold (VOV) (see

Figure 9).

AGND

VIN

MP5026

1.21V

OV

RTOP

RBOTTOM

Figure 9: OV Connection

VOV can be calculated with Equation (6):

TOP

OV

BOTTOM

R

V (V)

1.21

1

R



=

 +





(6)

Regardless of whether EN/UV is high or low,

OV detection and functionality remain active. If

VOV

exceeds

its

rising

threshold

(VOV_R)

(typically 1.21V), then the power MOSFET turns

off, and the FLTB and SS pins are pulled low. If

VOV drops below its falling threshold (VOV_F),

then the device can restart by cycling the power

on VIN or EN/UV (see Figure 10). To disable

OVP, connect the OV pin to GND.

OV

VIN

FLTB

EN/UV

VOUT

1.21V

1µs

1.13V

Figure 10: OV Protection Behavior

Power Good (PG)

Power good (PG) is an open-drain output that

indicates whether VOUT is within the normal

range relative to VIN. Pull PG up to the external

power supply or VCC via a 10

kΩ to 100kΩ

resistor. During start-up, the PG output is pulled

low, which commands the system to remain off

and minimize the load on VOUT. As a result,

inrush current and power dissipation is reduced

during start-up.