MP28256 – 21V, 3A, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER

MP28256 Rev. 1.0

www.MonolithicPower.com

4

11/3/2011

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© 2011 MPS. All Rights Reserved.

TYPICAL PERFORMANCE CHARACTERISTICS

Performance curves are tested on the evaluation board of the Design Example section.

INPUT VOLTAGE (V)

E nable Supply Current vs .

Input V oltage

Operating Range

Vcc Regulator Line Regulation

INPUT VOLTAGE (V)

DUTY CYCLE (%)

Line Regulation

INPUT VOLTAGE (V)

Case Temperature Rise vs.

Output Current

INPUT VOLTAGE (V)

LOAD CURRENT (A)

Disabled Supply Current vs .

Input Voltage

Current Limit vs.

Duty Cycle

Load Regulation

500

550

600

650

700

750

800

850

900

950

1000

0

5

10

15

20

25

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

5

10

15

20

25

4.3

4.4

4.5

4.6

4.7

4.8

4.9

5

5.1

5.2

0

5

10

15

20

25

0 10 20304050 607080

0.1

1

10

100

0

5

10

15

20

25

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.5

0

1 1.5

2 2.5

3 3.5

LOAD CURRENT (A)

V

V

V

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0

5

10

15

20

25

I

I

I

0

2

4

6

8

10

12

0 0.5

1 1.5

2 2.5

3 3.5

0

1

2

3

4

5

6

7

8

Minimum on Time Limit