MP5087A Rev. 1.0

www.MonolithicPower.com

13

7/18/2014

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Soft Start @ Different Output Capacitance

Soft Start @ Small Capacitance

Soft Start @ Large Capacitance

Soft Start @ Very large

Capacitance

Current Limit

Current Limit

Current Limit

Figure 3: Soft Start Periods at different output

capacitance

Design Example

Some design examples are provided below.

See Table 1 and Figure 4.

Table 1

(V)

Max Load Range

(A)

(kΩ)

SS cap

(nF)

SS time

(ms)

5

3

26.1

22

4

5

5

15.8

47

9

5

7.5

10.5

100

20

Figure 4: Typical Application Schematic

Layout Guide

PCB layout is very important to achieve stable

operation. Please follow these guidelines and

take below figure for reference (take schematic

in Figure 4 as an example). Place ILIM resistor

(R1 in Figure 4) close to ILIM pin, input cap

achieve better thermal performance.

GND

EN

Vin

Vin

Vout

GND

GND

ILIM

VCC

C1

C2

C3

C4

C5

C6

R1

GND

GND

Figure 5: Recommended Layout