PRODUCT DATASHEET
AAT2845
ChargePump
TM
Typical Characteristics
IN = 3.6V; C
IN
= C
OUTA
= C
OUTB
= 2.2µF; C
OUT
= 1µF; C
1
= C
2
= 1.0µF; C
BP
= 0.1µF; T
A
= 25°C, unless otherwise noted.
Typical values are at T
A
= 25°C.
Four-Channel Backlight Driver with Dual LDOs
AAT2845-QG LDOB Turn-On Characteristic
(V
OUTB
= 1.5V)
LDOs A and B Line Regulation, All Options
(10mA Load)
0.4
0.3
Error (%)
ENLDO
(2V/div)
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
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
OUTA
V
OUT
(500mV/div)
OUTB
Time (50µs/div)
Supply Voltage (V)
LDOs A and B Load Regulation, All Options
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
1
10
100
1000
LDOB Line Transient Response, All Options
(10mA Load)
V
IN
(400mV/div)
V
IN
= 4.2V
OUTA
V
OUT
(10mV/div)
V
IN
= 3.7V
Error (%)
OUTB
Load Current (mA)
Time (40µs/div)
LDOB Line Transient Response, All Options
(10mA Load)
V
IN
(400mV/div)
V
IN
= 4.2V
V
IN
= 3.7V
V
OUT
(10mV/div)
Time (40µs/div)
2845.2008.05.1.2
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