Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Typical Characteristics–White LED Backlight Driver Section
V
IN
= 3.5V, C
IN
= 2.2µF, C
CP
= C1 = C2 = 1.0µF; T
A
= 25°C, unless otherwise noted.
AAT2801
Efficiency vs. V
IN
(Code 26)
100
90
100
90
Efficiency vs. V
IN
(D1 = 3.5V; D2 = 3.3V; D3 = 3.2V; D4 = 3.0V)
Efficiency (%)
Efficiency (%)
80
70
60
50
40
30
2.9
3.0
3.1
3.0V
F
80
70
60
50
40
30
Code 26
3.5V
F
Code 28
2.9
3.0
3.1
3.2
Code 32
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
Input Voltage (V)
Input Voltage (V)
Efficiency vs. V
IN
(D1-D2 = 3.5V; D3-D4 = 3.2V)
100
90
5.0
Operating Current
(Code 23; EN_FLSH Off)
Code 26
Efficiency (%)
80
4.0
3.0
2.0
1.0
V_D
X
= 3.3V
60
50
40
30
2.9
Code 28
3.0
3.1
3.2
Code 32
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
I
IN
(A)
70
V_D
X
= 3.0V
0.0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Input Voltage (V)
Operating Current
(Code 23; EN_FLSH On; I
OUT
= 100mA)
8.0
7.0
6.0
V_D
X
= 3.3V
I
IN
(A)
5.0
4.0
3.0
2.0
1.0
0.0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
V_D
X
= 3.0V
Input Voltage (V)
2801.2006.04.1.3
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
