FAN5362 Datasheet, PDF (5/14 Pages) Fairchild Semiconductor – 3MHz, 500mA / 750mA Synchronous Buck Regulator

Typical Characteristics
Unless otherwise noted, VIN=VEN=3.6V,VMODE=0 (AUTO), VOUT=2.9V, COUT=10µF, and TA=25°C.
100%
98%
96%
94%
92%
90%
88%
86%
84%
82%
80%
1
VIN = 3.2, Mode=0
VIN = 3.6, Mode=0
VIN = 4.2, Mode=0
VIN = 3.2, Mode=1
VIN = 3.6, Mode=1
VIN = 4.2, Mode=1
10
100
I _LOAD Output Current (mA)
1000
Figure 4. Efficiency vs. Load Current and Input Supply
90
80
3.2VIN_Auto
70
3.6VIN_AUTO
60
50
40
30
20
10
0
0
100
200
300
400
500
Load current (mA)
Figure 6. Ripple
500
100
450 ^%
d.c.
400
350
Always PWM
300
250
Hysteresis
200
150
Always PFM
100
50
0
3
3.5
4
4.5
5
5.5
Input Voltage(V)
Figure 8. PFM / PWM Boundaries
2.910
2.905
2.900
2.895
2.890
Auto 3.6VIN
Auto 3.2VIN
2.885
-
100
200
300
400
500
I _LOAD Output Current (mA)
Figure 5. Load Regulation
3500
3000
2500
2000
1500
1000
500
0
0
3.2VIN_AUTO
3.6VIN_AUTO
3.6VIN_FPWM
3.2VIN_FPWM
50 100 150 200 250 300 350 400 450 500
Load Current(mA)
Figure 7. Effect of tOFF(MIN) on Reducing Switching
Frequency
1300
1200
1100
1000
900
800
‐40C
700
+25C
+85C
600
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Figure 9. Peak Inductor Current
© 2009 Fairchild Semiconductor Corporation
FAN5362 • Rev. 1.0.1
5
www.fairchildsemi.com