Diodes AP3421/A/B - Manual (Page 9)

Preliminary Datasheet
1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B
Feb. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
9
I
O1
500mA/div
V
O1
(AC)
100mV/div
I
O2
500mA/div
V
O2
(AC)
50mV/div
V
IN
2V/div
V
O1
2V/div
V
O2
1V/div
V
POR
2V/div
V
01
2V/div
V
O2
1V/div
V
POR
5V/div
V
IN
5V/div
Typical Performance Characteristics (Continued)
V
IN
=V
E/S
=5V, V
O1
=2.5V, V
O2
=1.2V, L1=L2=3.3
µH, C1=C3=10µF, C2=C2’=10µF, T
A
=25°C, unless
otherwise specified.
Time 4ms/div Time 400 µs/div
Figure 12. Start-up from VIN Figure 13. Power-down from VIN
Time 100
µs/div
Time 100
µs/div
Figure 14. Load Transient Figure 15. Load Transient
(V
O
=2.5V I
O
=0.5A to 1.0A) (V
O
=1.2V I
O
=0.5A to 1.0A)