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JANURARY 18, 2013 | DATA SHEET | Rev 3.5

10

IR3898

6A Highly Integrated SupIRBuck

TM

Single-Input Voltage, Synchronous Buck Regulator

PD-97662

78

80

82

84

86

88

90

92

94

96

98

0.6

1.2

1.8

2.4

3

3.6

4.2

4.8

5.4

6

Load Current (A)

1.0V

1.2V

1.8V

3.3V

5.0V

0.1

0.3

0.5

0.7

0.9

1.1

1.3

1.5

0.6

1.2

1.8

2.4

3

3.6

4.2

4.8

5.4

6

Load Current (A)

1.0V

1.2V

1.8V

3.3V

5.0V

TYPICAL EFFICIENCY AND POWER LOSS CURVES

PVin = 12V, Vcc = Internal LDO (4.4V/6.4V), Io = 0A-6A, Fs = 600 kHz, Room Temperature, No Air Flow. Note that the

efficiency and power loss curves include the losses of IR3898, the inductor losses and the losses of the input and output

capacitors. The table below shows the inductors used for each of the output voltages in the efficiency measurement.

VOUT (V)

LOUT (µH)

P/N

DCR (mΩ)

1.0

0.82

SPM6550T-R82M (TDK)

4.2

1.2

1.0

SPM6550T-1R0M (TDK)

4.7

1.8

1.0

SPM6550T-1R0M (TDK)

4.7

3.3

2.2

7443340220(Wurth Elektronik)

4.4

5

2.2

7443340220(Wurth Elektronik)

4.4