PRODUCT DATASHEET
AAT2847
ChargePump
TM
Typical Characteristics
Backlight Efficiency vs. Input Voltage
100
90
Four-Channel Backlight Driver with Dual LDOs
Backlight Current Matching vs. Temperature
(I
OUT
= 20mA/Channel; V
IN
= 4.2V)
21
Efficiency (%)
80
70
60
50
40
30
2.7
3.1
3.5
3.9
20mA/Channel
LED Current (mA)
5.5
20.5
20
19.5
19
18.5
-40
1mA/Channel
14.5mA/Channel
4.3
4.7
5.1
-15
10
35
60
85
Input Voltage (V)
Temperature (°C)
EN/SET Latch Timeout vs. Input Voltage
350
300
400
EN/SET Off Timeout vs. Input Voltage
-40°C
T
OFF
(µs)
350
300
250
200
150
100
4.3
4.7
5.1
5.5
50
2.7
3.1
-40°C
T
LAT
(µs)
250
200
150
100
50
85°C
25°C
85°C
3.5
3.9
25°C
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
Logic High Threshold Voltage
vs. Input Voltage
1.2
Logic Low Threshold Voltage
vs. Input Voltage
1.2
V
IH(ENA/ENB)
, V
IH(EN/SET)
(V)
V
IL(ENA/ENB)
, V
IL(EN/SET)
(V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
2.7
3.1
-40°C
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
2.7
3.1
3.5
-40°C
25°C
85°C
25°C
85°C
3.5
3.9
4.3
4.7
5.1
5.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
6
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2847.2008.05.1.2
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