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| AAT2842 Datasheet, PDF (7/21 Pages) Advanced Analogic Technologies – High-Current Charge Pump with S2Cwire™ Control and Dual LDO for Backlight and Flash | |||
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AAT2842
High-Current Charge Pump with S2Cwireâ¢
Control and Dual LDO for Backlight and Flash
Typical Characteristics
VIN = 3.6V; CIN = 4.7µF; COUT = 2.2µF; C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical
values are at TA = 25°C.
Backlight Efficiency vs. Supply Voltage
Flash Efficiency vs. Supply Voltage
100
90
30mA/ch
80
VF = 3.7V
70
60
7.5mA/ch
50
VF = 3.1V
40
2.1mA/ch
VF = 2.9V
30
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Supply Voltage (V)
100
90
80 150mA total
70
VF = 2.9V
60
50
40
300mA total
VF = 3.0V
200mA total
VF = 2.9V
30
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Supply Voltage (V)
Turn On to 1X Mode Backlight
(30mA/ch; Data 1; VIN = 4.2V)
EN
(2V/div)
OUT
(2V/div)
VSINK
(500mV/div)
IIN
(100mA/div)
Time (200µs/div)
Turn On to 1.5X Mode Backlight
(30mA/ch; Data 1; VIN = 3.5V)
EN
(2V/div)
OUT
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Time (200µs/div)
Turn On to 2X Mode Backlight
(30mA/ch; Data 1; VIN = 3.2V)
EN
(2V/div)
OUT
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Time (200µs/div)
2842.2006.10.1.0
Turn Off from 1.5X Mode Backlight
(30mA/ch; Data 1)
EN
(2V/div)
OUT
(2V/div)
IIN
(200mA/div)
Time (100µs/div)
7
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