AAT2848 Datasheet, PDF (6/19 Pages) Advanced Analogic Technologies – High-Current Charge Pump For Backlight Display and Flash Applications

ChargePump^TM
PRODUCT DATASHEET
AAT2848
High-Current Charge Pump For Backlight Display and Flash Applications
Typical Characteristics
Backlight Efficiency vs. Input Voltage
100
30mA/ch, VF = 3.4V
90
15mA/ch, VF = 3.2V
7.5mA/ch, VF = 3.0V
80
70
60
50
40
2.7
3.1
3.5
3.9
4.3
4.7
Input Voltage (V)
5.1
5.5
Backlight Current Matching vs. Temperature
(V_IN = 3.6V; 30mA/Channel)
30.5
30.0
29.5
29.0
-40
D1
D2
D3
D4
-15
10
35
60
85
Temperature (°C)
Flash Efficiency vs. Input Voltage
100
151mA/ch, VF = 3.0V
90
70mA/ch, VF = 2.9V
80
70
60
50
40
2.7
3.1
3.5
3.9
4.3
4.7
Input Voltage (V)
5.1
5.5
Flash Current Matching vs. Temperature
(V_IN = 3.6V; 150mA/Channel)
152
151
150
149
148
D1
D2
147
-40
-15
10
35
60
85
Temperature (°C)
Turn-On to 1x Mode Backlight
(V_IN = 4.5V; 30mA/Channel)
V_EN/SET
(2V/div) _0V
V_OUT
(2V/div) _0V
V_BLX 0V
(2V/div)
I_{IN 0A}
(200mA/div)
Time (100μs/div)
Turn-On to 1.5x Mode Backlight
(V_IN = 3.6V; 30mA/Channel)
V_EN/SET
(2V/div) _0V
V_OUT
(2V/div) _0V
V_BLX 0V
(2V/div)
I_{IN 0A}
(200mA/div)
Time (100μs/div)
6
www.analogictech.com
2848.2008.05.1.0