Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
C
IN
= C
O1
= C
O2
= 2.2µF, 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 and V
IN
= 3.6V.
AAT2845
EN/SET High Threshold Voltage (V)
EN/SET Low Threshold Voltage (V)
EN/SET Low Threshold Voltage
vs. Supply Voltage
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 High Threshold Voltage
vs. Supply Voltage
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)
LDOA Turn-On Characteristic
LDOB Turn-On Characteristic
ENLDO
(2V/div)
ENLDO
(2V/div)
V
OUT
(500mV/div)
V
OUT
(500mV/div)
Time (50µs/div)
Time (50µs/div)
LDOs A and B Line Regulation
(10mA Load)
0.4
0.3
0.2
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
LDOs A and B Load Regulation
Error (%)
0.1
0.0
-0.1
-0.2
-0.3
OUTA
Error (%)
OUTA
OUTB
OUTB
1
10
100
1000
-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
Input Voltage (V)
Load Current (mA)
8
2845.2006.12.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
