AAT2846 Datasheet, PDF (7/25 Pages) Advanced Analogic Technologies – High Current Charge Pump with Dual LDO for Backlight and Flash Applications

AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
Typical Characteristics
Backlight Efficiency vs. Input Voltage
100
90
20mA/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
Input Voltage (V)
Flash Efficiency vs. Input Voltage
100
72mA/ch
90
150mA/ch
80
70
60
50
40
30
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Backlight Current Matching vs. Temperature
(20mA/ch; Data 1)
21.0
20.5
20.0
19.5
19.0
18.5
-40
-15
10
35
60
85
Temperature (°C)
Flash Current Matching vs. Temperature
(150mA/Ch; Data 6)
170
165
160
155
150
145
140
135
130
-40
-15
10
35
60
85
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)
0V
0V
0V
I_IN
0A
(200mA/div)
Time (200µs/div)
Turn On to 1.5X Mode Backlight
(30mA/ch; Data 1; V_IN = 3.4V)
V_EN
(2V/div) _0V
V_OUT
0V
(2V/div)
V_SINK
(500mV/div)
0V
I_IN
0A
(200mA/div)
Time (200µs/div)
2846.2007.08.1.0
7