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IR3871MPBF

8A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR

International Rectifier 

IR3871MPBF

TYPICAL OPERATING DATA

Tested with demoboard shown in Figure 7, VIN = 12V, VCC = 5V, Vout = 1.05V, Fs = 300kHz, TA = 25oC, no airflow,

unless otherwise specified

95%

EFF @ 8VIN

85%

100%

90%

75%

65%

EFF @ 19VIN

80%

70%

EFF @ 3.3VOUT, L = 3.3µH

55%

45%

EFF @ 12VIN

35%

0.01

0.1

1

10

Output Current (A)

Figure 1. Efficiency vs. Output Current for

VOUT = 1.05V

60%

EFF @ 1.5VOUT, L = 2.2µH

50%

EFF @ 1.05VOUT, L = 1.5µH

40%

0.01

0.1

1

10

Output Current (A)

Figure 2. Efficiency vs. Output Current for

VIN = 12V

350

300

250

200

150

100

50

0

01234567

Output Current (A)

Figure 3. Switching Frequency vs. Output

Current

1200

1000

800

600

400

200

0

8

200

5.0 Vout

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

400

600

800

Frequency (kHz)

Figure 4. Frequency vs. RFF

1000

1.052

1.051

1.050

VOUT @ 19VIN

VOUT @ 12VIN

1.049

VOUT @ 8VIN

1.048

012345678

Output Current (A)

Figure 5. Output Voltage Regulation vs.

Output Current

1.052

1.051

1.050

1.049

1.048

6

8 10 12 14 16 18 20

Input Voltage (V)

Figure 6. Output Voltage Regulation vs.

Input Voltage at IOUT = 8A

7

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