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IR3710MTRPBF
TYPICAL OPERATING DATA
(Circuit of Figure 18, VCC = 3.3V, V5 = 5V, V IN = 12.6V, Unless otherwise noted.)
1000000
19Vin
12Vin
Ploss-19Vin
Ploss-12Vin
1000
90
6.0
Rff ( 0.5 , fsw )
Rff ( 1 , fsw )
88
5.0
Rff ( 1.5 , fsw )
Rff ( 2 , fsw )
Rff ( 2.5 , fsw )
Rff ( 3 , fsw )
Rff ( 3.5 , fsw )
Rff ( 4 , fsw )
Rff ( 4.5 , fsw )
Rff ( 5 , fsw )
V OUT = 5V
86
84
82
80
78
4.0
3.0
2.0
1.0
0 200000
200
000000 V OUT = 0.5V
fsw
Switching Frequency
Switching Frequency (KHz)
1000000
1000
76
0
2
4
6
8 10 12 14 16 18 20 22 24
Output Current(A)
0.0
Figure 1. Feedforward Resistance vs Switching Freq:
0.5V V OUT step, FCCM = HIGH.
Figure 4. System Efficiency
350
Freq vs Load
7.4
Fs =300kHz; Ccpo=1uF
Fs=1.34MHz ;Ccpo=1uF
300
250
200
150
100
50
7.2
7
6.8
6.6
6.4
6.2
0
0
2
4
6
8
10
12
14
16
18
20
22
24
6
0
5
10
15
20
25
30
35
40
45
Output Current (A)
Figure 2. Switching Frequency vs Output Current
Gate Charge (nC)
Figure 5. Charge Pump Regulation
12Vin@0C
12Vin@65C
19Vin@0C
19Vin@65C
5V Drive
Ploss-5V Drive
Enhanced Gate
Ploss-Enhanced Gate
1.10150
1.10100
1.10050
90
88
86
5.0
4.5
4.0
3.5
1.10000
1.09950
84
3.0
2.5
2.0
1.09900
1.09850
1.09800
82
80
78
1.5
1.0
0.5
0.0
0
2
4
6
8
10 12 14 16 18 20 22 24
0
2
4
6
8
10
12
Output Current(A)
Figure 3. Output Voltage Regulation versus Input
Voltage and Ambient Temperature
Output Current(A)
Figure 6. Charge Pump Efficiency Comparison:
1.25Vout, 12.6Vin, 300kHz,
IRF8721/8721, 0.82uH (4.2mOhm DCR)
Page 7 of 20
www.irf.com
IR Confidential
4/26/10
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