IR3476 Datasheet, PDF (9/21 Pages) International Rectifier – 12A Highly Integrated SupIRBuck IR3476 TM

12A Highly Integrated SupIRBuck^TM
IR3476
TYPICAL OPERATING DATA
Tested with demoboard shown in Figure 4, VIN = 12V, VCC = 5V, VOUT = 1.05V, Fs = 300kHz, T_A = 25^oC, no airflow,
unless otherwise specified.
95%
85%
75%
65%
55%
19VIN
12VIN
8VIN
45%
0.01
0.1
1
10
100
Load Current (A)
Figure 5: Efficiency vs. Load Current for VOUT = 1.05V
400
350
300
250
200
150
100
50
0
0
3
6
9
12
Load Current (A)
Figure 7: Switching Frequency vs. Load Current
1.060
1.058
1.056
1.054
1.052
1.050
0
19VIN
12VIN
8VIN
2
4
6
8
Load Current (A)
Figure 9: Load Regulation
10 12
100%
90%
80%
70%
60%
VOUT = 1.05V; L = 1.5µH, 3.8mΩ
VOUT = 1.5V; L = 2.2µH, 4.6mΩ
VOUT = 3.3V; L = 3.3µH, 7.7mΩ
50%
0.01
0.1
1
10
100
Load Current (A)
Figure 6: Efficiency vs. Load Current for VIN = 12V
1400
1200
1000
800
5.0 Vout
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
600
400
200
0
200 250 300 350 400 450 500 550 600 650 700 750
Switching Frequency (kHz)
Figure 8: R_FF vs. Switching Frequency
1.060
1.058
1.056
1.054
1.052
1.050
8
9 10 11 12 13 14 15 16 17 18 19
Input Voltage (V)
Figure 10: Line Regulation at I_OUT = 12A
9 August 8, 2012 | ADVANCED DATASHEET | V2.1 | PD97603