FAN5358 Datasheet, PDF (5/13 Pages) Fairchild Semiconductor – 2MHz, 500mA, SC70 Synchronous Buck Regulator

Typical Characteristics
Unless otherwise noted, VIN = VEN = 3.6V, VOUT = 1.8V, and TA = 25°C.
95
90
85
80
75
70
2.7V_IN
65
3.6V_IN
60
4.2V_IN
0.001
0.01
0.1
1
Load Current (A)
Figure 4. Efficiency vs. Load Current and Input Supply
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
0
2.7V_IN
3.6V_IN
4.2V_IN
5.5V_IN
0.1 0.2 0.3 0.4 0.5 0.6
Load Current (A)
Figure 6. Voltage Regulation
3.0
2.5
2.0
1.5
1.0
0.5
0
0
2.7V_IN
3.6V_IN
5.5V_IN
0.1
0.2
0.3
0.4
0.5
0.6
Load Current (A)
Figure 8. Switching Frequency vs. Load Current
100
V_IN=3.6V
90
80
70
-40°C
25°C
85°C
60
0.001
0.01
0.1
1
Load Current (A)
Figure 5. Efficiency vs. Load Current and Temperature
20
15
10
5
2.7V_IN
3.6V_IN
0
5.5V_IN
1
10
100
Load Current (mA)
1000
Figure 7. Peak-to-Peak Output Voltage Ripple
180
PFM Border
160
Always PWM
PWM Border
140
The switching mode
changes at these borders
120
100
Always PFM
80
2.7
3.2
3.7
4.2
4.7
5.2
Input Voltage (V)
Figure 9. PFM / PWM Boundaries
© 2009 Fairchild Semiconductor Corporation
FAN5358 • Rev. 1.0.1
5
www.fairchildsemi.com