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