IR3710MTRPBF_10 Datasheet, PDF (7/20 Pages) International Rectifier – WIDE INPUT AND OUTPUT, SYNCHRONOUS BUCK REGULATOR

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