FAN53541 Datasheet, PDF (7/15 Pages) Fairchild Semiconductor – 2.4 MHz, 5 A TinyBuck Synchronous Buck Regulator

Typical Characteristics
Unless otherwise specified; V_IN=5 V, V_OUT=1.2 V, V_MODE=0 V, T_A=25°C, circuit in Figure 1, and components per Table 1.
35
30
25
20
15
10
5
0
-5
0
2.7 VIN
3.3 VIN
5.0 VIN
5.5 VIN
1000
2000
3000
4000
5000
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
0
4.2 VIN
5.0 VIN
5.5 VIN
1000
2000
3000
4000
5000
Load Current (mA)
Load Current (mA)
1,400
1,200
1,000
800
600
400
200
0
2.5
Figure 10. Regulation, 1.2 V_OUT
3.0
3.5
4.0
4.5
Input Voltage (V)
PFM Exit
PFM Enter
5.0
5.5
1,400
1,200
1,000
800
600
400
200
0
3.5
Figure 11. Regulation, 3.3 V_OUT
4.0
4.5
Input Voltage (V)
PFM Exit
PFM Enter
5.0
5.5
Figure 12. PFM / PWM Boundaries, 1.2 V_OUT
30
3.6VIN, Auto
3.6VIN, PWM
25
5.0VIN, Auto
5.0VIN, PWM
20
15
10
5
0
0
1000
2000
3000
4000
5000
Load Current (mA)
Figure 13. PFM / PWM Boundaries, 3.3 V_OUT
3,000
2,500
2,000
1,500
1,000
500
3.6VIN, Auto
5.0VIN, Auto
0
0
1000
2000
3000
4000
5000
Load Current (mA)
Figure 14. Output Voltage Ripple
Figure 15. Switching Frequency
© 2013 Fairchild Semiconductor Corporation
FAN53541 • Rev. 1.0.2
7
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