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AUGUST 08, 2012 | DATA SHEET | Rev 3.3

11

IR3898

Single-Input Voltage, Synchronous Buck Regulator

PD-97662

83

85

87

89

91

93

95

97

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

1.7

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 = External 5V, 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