FAN2315MPX Datasheet, PDF (7/19 Pages) Fairchild Semiconductor – FAN2315 TinyBuck 15 A Integrated Synchronous Buck Regulator

Typical Performance Characteristics
Tested using evaluation board circuit shown in Figure 1 with V_IN=12 V, V_OUT=1.2 V, f_SW=500 kHz, T_A=25°C, and no
airflow; unless otherwise specified.
100
100
90
90
80
80
70
70
60
50
40
30
0.01
Vo=5V, L=1.2uH
Vo=3.3V, L=1.2uH
Vo=1.2V, L=0.56uH
Vo=1.05, L=0.4uH
0.1
1
10
Load Current (A)
60
50
40
30
0.01
Fsw=300kHz, L=0.72uH
Fsw=500kHz, L=0.56uH
Fsw=1MHz, L=0.3uH
0.1
1
10
Load Current (A)
Figure 5. Efficiency vs. Load Current with
V_IN=12 V and f_SW=500 kHz
Figure 6. Efficiency vs. Load Current with
V_IN=12 V and V_OUT=1.2 V
100
95
90
85
80
75
0
12VIN_5VOUT_500KHZ_1.2UH
12VIN_3.3VOUT_500KHZ_1.2UH
12VIN_1.2VOUT_300KHZ_0.72UH
12VIN_1.2VOUT_500KHZ_0.56UH
12VIN_1.05VOUT_500KHZ_0.4UH
12VIN_1.2VOUT_1MHZ_0.3UH
5
10
15
20
Load Current (A)
100
90
80
70
60
50
40
30
20
10
0.001
Vin=5V, L=0.4uH
Vin=8V, L=0.4uH
Vin=12V, L=0.56uH
0.01 0.1
1
10
Load Current (A)
Figure 7. Efficiency vs. Load Current with V_IN=12 V
Figure 8. Efficiency vs. Load Current with
V_OUT=1.2 V and f_SW=500 kHz
80
70
12Vi, 1.2Vo, 1MHz
60
12Vi, 1.2Vo, 500kHz
50
12Vi, 1.2Vo, 300kkHz
40
30
20
10
0
0
5
10
15
20
Load Current (A)
1.22
1.215
1.21
1.205
1.2
1.195
1.19
0
5
10
15
Load Current (A)
Figure 9. Case Temperature Rise vs. Load Current
on 4-Layer PCB, 1 oz Copper, 7 cm x 7 cm
Figure 10. Load Regulation
© 2011 Fairchild Semiconductor Corporation
FAN2315 • Rev. 1.0.4
7
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