User Manual

Preliminary Datasheet
1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B
Feb. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
8
Typical Performance Characteristics (Continued)
V
IN
=V
E/S
=5V, V
O1
=2.5V, V
O2
=1.2V, L1=L2=3.3µH, C1=C3=10µF, C2=C2’=10µF, T
A
=25°C, unless
otherwise specified.
Figure 8. VO1 Voltage vs. Output Current Figure 9. VO2 Voltage vs. Output Current
Figure 10. VO1 Efficiency vs. Output Current Figure 11. VO2 Efficiency vs. Output Current
200 400 600 800 1000 1200 1400
1.000
1.025
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
1.300
V
O1
=2.5V, I
O1
=1A
VO2 Voltage (V)
Output Current (mA)
200 400 600 800 1000 1200
40
45
50
55
60
65
70
75
80
85
90
95
100
VO1 Efficiency (%)
Output Current (mA)
V
O1
=2.5V
200 400 600 800 1000 1200
2.40
2.42
2.44
2.46
2.48
2.50
2.52
2.54
2.56
2.58
2.60
V
O2
=1.2V, I
O2
=1A
VO1 Voltage (V)
Output Current (mA)
200 400 600 800 1000 1200 1400
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
VO2 Efficiency (%)
Output Current (mA)
V
O2
=1.2V