MP5000S – 12V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH

MP5000S Rev. 1.0

www.MonolithicPower.com

11

4/29/2013

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APPLICATION INFORMATION

Current Limit

The desired current limit is a function of the

external current limit resistor.

Table 2

—Current Limit vs. Current Limit Resistor

Current Limit

Resistor (

Ω)

15.4

22

50

100

Trip Current (A)

6.1

5

2.7

2.3

Hold Current (A)

5.8

3.7

1.63

1.1

Rise Time

The rise time is a function of the capacitor

(Cdvdt) on the dv/dt pin.

Table 3

—Rise Time vs. Cdv/dt

Cdvdt

none

50pF

500pF

1nF

Rise Time

(TYPICAL) (ms)

0.9

2

12

23

The “rise time” is measured by from 0% to 100%

of output voltage.

Figure 2

—Rise Time

PCB LAYOUT

PCB layout is very important to achieve stable

operation. Please follow these guidelines and

take below figure for reference. Place Rlimit

close to I_limit pin, Cdv/dt close to dv/dt pin and

Put vias in thermal pad and ensure enough

better thermal performance.

SOURCE

EN/ FAULT

dv/dt

10

9

8

7

6

1

2

3

4

5

N/C

GND

VIN

GND

SOURCE

SOURCE

SOURCE

SOURCE

EN/ FAULT

VIN

VOUT

I_LIMIT

C3

Top Layer

VIN

Bottom Layer

Figure 3

―PCB Layout