AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
Typical Characteristics
Backlight Efficiency vs. Input Voltage
100
90
Flash Efficiency vs. Input Voltage
100
20mA/ch
90
72mA/ch
150mA/ch
Efficiency (%)
80
70
60
50
40
30
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Efficiency (%)
80
70
60
50
40
30
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
10.2mA/ch 1.6mA/ch
Input Voltage (V)
Input Voltage (V)
Backlight Current Matching vs. Temperature
(20mA/ch;
Data 1)
21.0
Flash Current Matching vs. Temperature
(150mA/Ch; Data 6)
170
165
LED Current (mA)
20.5
20.0
19.5
19.0
18.5
-40
LED Current (mA)
160
155
150
145
140
135
130
-40
-15
10
35
60
85
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
Turn On to 1X Mode Backlight
(30mA/ch; Data 1; V
IN
= 4.2V)
V
EN
(2V/div)
V
OUT
(2V/div)
V
SINK
(500mV/div)
I
IN
(200mA/div)
Turn On to 1.5X Mode Backlight
(30mA/ch; Data 1; V
IN
= 3.4V)
V
EN
(2V/div)
0V
0V
0V
0V
V
OUT
(2V/div)
V
SINK
(500mV/div)
0A
0V
0V
0A
I
IN
(200mA/div)
Time (200µs/div)
Time (200µs/div)
2846.2007.08.1.0
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
