MP5010S

– 5V, 5A PROGRAMMABLE CURRENT LIMIT SWITCH

MP5010S Rev. 1.0

www.MonolithicPower.com

11

8/4/2013

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APPLICATION INFORMATION

Current Limit Setting

The desired current limit is a function of the

external current limit resistor.

Table 2

—Current Limit vs. Current Limit Resistor

15.4

22

51

100

Trip

Current (A)

4

3.1

2.1

1.8

Hold

Current (A)

3

2

0.9

0.5

Rise Time Setting

The rise time is a function of the capacitor

(Cdv/dt) on the dv/dt pin.

Table 3

—Rise Time vs. Cdv/dt

Cdv/dt

none

50pF

500pF

1nF

Rise Time

(TYPICAL)(ms)

1.1

2.2

12.3

23.5

The “rise time” is measured by from 10% to 90%

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 input cap close to Vcc pin. Keep the

N/C pin float. Put vias in thermal pad and ensure

enough copper area near Vcc and source to

achieve better thermal performance.

SOURCE

EN/ FAULT

dv/dt

5

4

3

2

1

6

7

8

9

10

I_LIMIT

N/C

GND

GND

VIN

VOUT

C3

SOURCE

SOURCE

SOURCE

SOURCE

EN/ FAULT

VIN

Top Layer

VIN

Bottom Layer

Figure 3

―PCB Layout

Design Example

Below is a direct current sensing design example

following

the

application

guidelines

for

the

specifications:

Table 4

5V

Trip Current

3.1A

Hold Current

2A

The detailed application schematic is shown in

Figure 4. The typical performance and circuit

waveforms have been shown in the Typical

Performance Characteristics section. For more

device applications, please refer to the related

Evaluation Board Datasheets.