Advanced Analog Technology, Inc.
July 2008
AAT1500
TYPICAL OPERATING CHARACTERISTICS
Typical Application
D1
D2
LED
D3
LED
D4
LED
L1 4.7 H
VIN :
2.6V~5.5V
Efficiency vs. V
O
92%
90%
88%
AAT1500
1
2
SW
VDD
6
C1
10 F
86%
84%
82%
C2
10 F
OVP
5
GND
EN
4
3
IE
R1
12.4
80%
78%
76%
3.5
6.5
9.5
12.5
Efficiency vs. V
IN
94%
92%
90%
88%
86%
84%
82%
80%
78%
76%
2.5
3
95%
V
O
(V)
Efficiency vs. LED Current
2-LED
90%
1-LED
85%
3-LED
1-LED
3-LED
4-LED
80%
75%
70%
65%
60%
4-LED
2-LED
3.5
4
4.5
5
5.5
0
5
10
15
20
25
30
V
IN
(V)
22.5
22
21.5
21
20
20.5
20
19.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
19.5
19
18.5
3
4
LED Current (mA)
22
21.5
21
20.5
LED Current vs. V
IN
LED Current vs. V
O
5
6
7
8
9
10
11
V
IN
(V)
V
O
(V)
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Advanced Analog Technology, Inc
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