FAN5354 Datasheet, PDF (5/14 Pages) Fairchild Semiconductor – 3MHz, 3A Synchronous Buck Regulator

Typical Characteristics
Unless otherwise specified, VIN=5V, VOUT=1.2V, circuit of Figure 1, and components per Table 1.
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
VIN = 3.3V, Mode=0
VIN = 3.3V, Mode=1
VIN = 5V, Mode=0
VIN = 5V, Mode=1
0%
1
10
100
1000
I _LOAD Output Current (mA)
10000
Figure 3. Efficiency vs. ILOAD at VOUT=1.2V
100%
90%
80%
70%
60%
50%
40%
30%
20%
VIN = 3.3V, Mode = 0
VIN = 3.3V, Mode = 1
VIN = 5V, Mode = 0
VIN = 5V, Mode = 1
10%
0%
1
10
100
1000
I _LOAD Output Current (mA)
10000
Figure 4. Efficiency vs. ILOAD at VOUT=1.8V
100%
90%
80%
70%
60%
50%
40%
30%
20%
VIN = 3.3V, Mode = 0
VIN = 3.3V, Mode = 1
VIN = 5V, Mode = 0
VIN = 5V, Mode = 1
10%
0%
1
10
100
1000
I _LOAD Output Current (mA)
10000
Figure 5. Efficiency vs. ILOAD at VOUT=2.5V
100%
90%
80%
70%
60%
50%
40%
30%
20%
VIN = 4.2V, Mode = 0
VIN = 4.2V, Mode = 1
VIN = 5V, Mode = 0
VIN = 5V, Mode = 1
10%
0%
1
10
100
1000
I _LOAD Output Current (mA)
10000
Figure 6. Efficiency vs. ILOAD at VOUT=3.3V
1
0.9
0.8
0.7
0.6
0.5
85°C
0.4
25°C
0.3
‐40°C
0.2
0.1
0
2.7
3.2
3.7
4.2
4.7
5.2
Input Voltage(V)
Figure 7. Shutdown Supply Current vs VIN, EN=0
400
375
350
VOUT = 3.3
325
300
VOUT = 1.2
275
250
85°C
25°C
225
–40°C
200
2.7
3.2
3.7
4.2
4.7
5.2
Input Voltage(V)
Figure 8. Quiescent Current in PFM vs. VIN, No Load
© 2009 Fairchild Semiconductor Corporation
FAN5354 • Rev. 1.0.4
5
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