MP5000A – 12V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH

MP5000A Rev. 1.01

www.MonolithicPower.com

12

10/16/2014

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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

15.4

18.2

22

30

51

100

Trip

Current (A)

5.93

5.26

4.70

3.71

2.84

2.28

Hold

Current (A)

5.28

4.37

3.60

2.56

1.52

0.81

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.

U

100%

0%

Rise Time

t

Input

Output

Enable

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