ADPL12002/ADPL12003

20V, 2.5A/3.5A, Fully Integrated Synchronous

Buck Converter

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Analog Devices | 15

Inductor Selection

Inductor design is a compromise between the size, efficiency, control-loop bandwidth, and stability of the converter. An

insufficient inductance value increases the inductor current ripple, resulting in higher conduction losses and a higher

output voltage ripple. Since the slope compensation is fixed internally for the ADPL12002/ADPL12003, it might also cause

current-mode-control instability. A large inductor reduces the ripple but increases the size and cost of the solution and

slows the response. Table 2 provides optimized inductor values for the respective switching frequency and output voltage.

Table 2. Recommended Inductor Values

PART NUMBER

FREQUENCY

VOUT (V)

INDUCTOR (μH)

MIN

TYP

MAX

ADPL12002

400kHz

3.3V

4.7

6.8

8.2

5V

6.8

8.2

10

12V

10

12

15

1.5MHz

3.3V

1.5

2.2

2.8

5V

1.8

2.2

3.3

12V

3.3

4.7

5.6

ADPL12003

400kHz

3.3V

4.7

6.8

8.2

5V

4.7

6.8

8.2

12V

8.2

10

12

1.5MHz

3.3V

1.0

2.2

2.8

5V

1.5

2.2

3.3

12V

3.3

4.7

5.6