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JANURARY 18, 2013 | DATA SHEET | Rev 3.5

13

IR3898

6A Highly Integrated SupIRBuck

TM

Single-Input Voltage, Synchronous Buck Regulator

PD-97662

6

6.25

6.5

6.75

7

7.25

7.5

25

30

35

40

45

50

55

60

65

70

75

80

85

TAmb

0 LFM

200 LFM

Lout-1uH,4.7m

Ω(TDK SPM6550T-1R0)

5.5

5.75

6

6.25

6.5

6.75

7

7.25

25

30

35

40

45

50

55

60

65

70

75

80

85

TAmb

0 LFM

200 LFM

Lout-1.5uH,6.7m

Ω(Cyntec PCMB065T-1R5MS)

THERMAL DERATING CURVES

Measurement is done on IRDC3898 Evaluation board, a 4-layer board with 2 oz Copper, FR4 material, size 2.23"x2"

PVin = 12V, Vout=1.2V, Vcc = Internal LDO (6.4V), Fs = 600 kHz

PVin = 12V, Vout=3.3V, Vcc = Internal LDO (6.4V), Fs = 600 kHz

Note: International Rectifier Corporation specifies current rating of SupIRBuck devices conservatively. The continuous current

load capability might be higher than the rating of the device if input voltage is 12V typical and switching frequency is below

750 kHz. The above derating curves are generated at 12V input, 600kHz with 0-200LFM air flow and ambient temperature up

to 85°C.Detailed thermal derating information can be found in the Application Note AN-1174

“Thermal Derating of DC DC

Convertors using IR3899/98/97”. However, the maximum current is limited by the internal current limit and designers need to

consider enough guard bands between load current and minimum current limit to guarantee that the device does not trip at

steady state condition.