AAT2856_08 Datasheet, PDF (5/18 Pages) Advanced Analogic Technologies – High Current Charge Pump with Dual LDO for Backlight Applications

PRODUCT DATASHEET
AAT2856
ChargePump^TM High Current Charge Pump with Dual LDO for Backlight Applications
Typical Characteristics
Backlight Efficiency vs. Input Voltage
100
90
20mA/ch
80
70
60
50 _10.2mA/ch
40
1.6mA/ch
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
20.5
20
19.5
19
18.5
-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)
Turn On to 2X Mode Backlight
(30mA/ch; Data 1; V_IN = 2.7V)
V_EN
(2V/div)
V_OUT
(2V/div)
V_SINK
(500mV/div)
0V
0V
0V
I_IN
0A
(200mA/div)
Time (200µs/div)
Turn Off from 1.5X Mode Backlight
(30mA/ch; Data 1)
V_EN
(2V/div)
V_OUT
(2V/div)
I_IN
(200mA/div)
0V
0V
0A
Time (100µs/div)
2856.2008.02.1.3
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