MP1492 – 2A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER

MP1492 Rev. 1.1

www.MonolithicPower.com

16

3/13/2012

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Table 6—700kHz Recommended Parameters

with External Ramp Compensation

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

R7

(kΩ)

1.2

2.2

12.1

26.1

330

220

174

2.5

2.2

30

14.3

549

220

348

3.3

2.2

40.2

12.7

698

220

475

According to equation (22) and some design

abundance

are

reserved,

recommended

maximum output capacitor value is shown in

Table 7.

Table 7—Recommended Maximum Output

(V)

1.2

1.8

2.5

3.3

5

(μF)

680

570

390

330

220

The detailed application schematic is shown in

Figure 11, 12 and Figure 13. The typical

performance and circuit waveforms have been

shown

in

the

Typical

Performance

Characteristics section.

For more possible

applications of this device, please refer to related

Evaluation Board Data Sheets.

MP1492

1

5

8

6

7

3

4

2

BYP

EN

FB

SW

BST

FREQ

IN

Figure 11—Typical Application Schematic with No External Ramp

MP1492

1

5

8

6

7

R9

0

3

4

2

BYP

EN

FB

SW

BST

FREQ

IN

Figure 12—Typical Application Schematic with Low ESR Ceramic Capacitor