IR3897MTRPBF International Rectifier, IR3897MTRPBF Datasheet - Page 13

• Manufacturer Part Number: IR3897MTRPBF
• Description: 4A Highly Integrated Single-Input Voltage, Synchronous Buck Regulator in a PQFN package.
• Manufacturer: International Rectifier

Specifications of IR3897MTRPBF

• Part Status: Active and Preferred
• Package: PQFN / 4 x 5
• Circuit: Single Output
• Iout (a): 4
• Switch Freq (khz): 0 - 1500
• Input Range (v): 1.0 - 16
• Output Range (v): 0.5 - 12
• Pbf: PbF Option Available

THERMAL DERATING CURVES
Measurement done on Evaluation board of IRDC3897.PCB is 4 layer board with 2 oz Copper, FR4 material, size 2.23"x2"
PVin = 12V, Vout=1.2V, Vcc = Internal LDO (6.4V), Fs = 600kHz
PVin = 12V, Vout=3.3V, Vcc = Internal LDO (6.4V), Fs = 600kHz
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 amb.temperature upto
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.
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FEBRUARY 02, 2012 |DATA SHEET | Rev 3.2
5.6
5.4
5.2
4.8
4.6
4.4
5.6
5.4
5.2
4.8
4.6
4.4
5
5
25
25
30
30
Single‐Input Voltage, Synchronous Buck Regulator
35
35
40
40
45
45
- 13 -
50
4A Highly Integrated SupIRBuck
Lout-1.5uH,6.7mΩ(Cyntec PCMB065T-1R5MS)
Lout-3.3uH,6.5mΩ(Wurth Elektronik 7443340330)
50
TAmb
TAmb
0 LFM
55
0 LFM
55
60
60
65
65
70
70
75
75
80
80
TM
85
85
IR3897
PD‐97663