Diodes AP3422 - Manual (Page 7)

Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter AP3422
Feb. 2013 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
7
-60 -40 -20 0 20 40 60 80 100
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
No
rm
a
lize
d
Feed
back Vo
lt
a
g
e
(
%
)
Temperature ( o C)
V
IN
=3.6V
V
OUT1
=1.8V
Typical Performance Characteristics (Continued)
L1=L2=10 µH, C
IN1
=C
IN2
=C
OUT1
=C
OUT2
=10 µF, T
A
=25 ºC, unless otherwise noted.
Figure 8. Normalized Feedback Voltage vs. Temperature Figure 9. Efficiency vs. Output Current
Time 200 µs/div Time 1µs/div
V
OUT1
200mV
I
OUT1
500mA
I
OUT2
500mA
V
OUT2
200mV V
OUT2
20mV
V
OUT1
20mV
V
SW1
5V
V
SW2
5V
Figure 10. Load Transient (V
IN
=4.2V, V
OUT1
=1.8V, V
OUT2
=1.2V,
I
OUT1
=400mA to 800mA, I
OUT2
=400 to 800mA)
Figure 11. Heavy Load Operation (V
IN
=4.2V,
V
OUT1
=1.8V, V
OUT2
=1.2V, I
OUT1
=I
OUT2
=800mA)
0 200 400 600 800
50
60
70
80
90
100
Ef
fici
ency (%)
Output Current (mA)
V
IN
=4.2V
V
OUT1
=1.8V
V
OUT2
=1.2V