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| AAT2845 Datasheet, PDF (6/19 Pages) Advanced Analogic Technologies – Four-Channel Backlight Driver with Dual LDOs | |||
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AAT2845
Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
CIN = CO1 = CO2 = 2.2µF, C1 = C2 = 1.0µF, CBP = 0.1µF; TA = 25°C, unless otherwise noted. Typical values are
at TA = 25°C and VIN = 3.6V.
Backlight Efficiency vs. Supply Voltage
100
90
80
20mA/ch
70
60
1mA/ch
50
14.7mA/ch
40
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)
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(100mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(200mA/div)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(500mV/div)
IIN
(500mA/div)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/ch Load)
Time (100µs/div)
Turn-Off from 1.5X Mode Backlight
(30mA/ch; Data 1)
EN
(2V/div)
VDIODE
(2V/div)
IIN
(200mA/div)
6
Time (100µs/div)
2845.2006.12.1.0
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