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
EN/SET High Threshold Voltage (V)
EN/SET Low Threshold Voltage (V)
EN/SET and ENLDO Low Threshold Voltage
vs. Supply Voltage and Temperature
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
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
EN/SET and ENLDO High Threshold Voltage
vs. Supply Voltage and Temperature
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
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
-40°C
-40°C
25°C
85°C
25°C
85°C
Supply Voltage (V)
Supply Voltage (V)
AAT2845-EE LDOA Turn-On Characteristic
(V
OUTA
= V
FBA
)
AAT2845-EE LDOB Turn-On Characteristic
(V
OUTB
= V
FBB
)
ENLDO
(2V/div)
ENLDO
(2V/div)
V
OUT
(500mV/div)
V
OUT
(500mV/div)
Time (50µs/div)
Time (50µs/div)
AAT2845-QG/QI LDOA Turn-On Characteristic
(V
OUTA
= 2.8V)
AAT2845-QI LDOB Turn-On Characteristic
(V
OUTB
= 1.8V)
ENLDO
(2V/div)
ENLDO
(2V/div)
V
OUT
(1V/div)
V
OUT
(500mV/div)
Time (50µs/div)
Time (50µs/div)
8
www.analogictech.com
2845.2008.05.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
