MP5098

– 12V/5V, DUAL-CHANNEL E-FUSE WITH CURRENT MONITORING

MP5098 Rev. 1.0

MonolithicPower.com

18

11/2/2021

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APPLICATION INFORMATION

Setting the Soft-Start Time (tSS)

The soft-start time (tSS) is a function of the soft-

start capacitor (CSS). tSS can be calculated with

Equation (3):

( )

( )

SS

SS

DT

DV

I

nF

C

V

ms

t



=

1

/

(3)

Where tDV/DT is tSS between 0% and 100% of VOUT.

Design Example

Table 1 shows a design example following the

application guidelines for the specifications.

Table 1: Design Example

VIN1

12V

VOUT1

12V

VIN2

5V

VOUT2

5V

Figure 3 on page 19 shows the detailed

application schematic. The typical performance

and

waveforms

are

shown

in

the

Typical

Characteristics section on page 7 and the Typical

Performance Characteristics section on page 10.

For more device applications, refer to the related

evaluation board datasheet.

PCB Layout Guidelines

Efficient PCB layout is critical for stable operation.

For best results, refer to Figure 2 and follow the

guidelines below:

1. Place the high-current paths (VIN and VOUT)

close to the device using short, direct, and

wide traces.

2. Place the input capacitors as close to the VIN

and GND pins as possible.

3. To improve thermal performance, connect the

VIN pad to the large VIN plane, and the

VOUT pad to the large VOUT plane.

4. Place CSS as close to SS pin as possible.

GND

GND

VIN1

VOUT1

VIN2

VOUT2

Figure 2: Recommended PCB Layout