PRODUCT DATASHEET
AAT2861
TM
ChargePump
Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit
Typical Characteristics
Backlight Efficiency vs. Input Voltage
Flash Efficiency vs. Input Voltage
100
90
100
90
80
70
60
50
40
30
80
70
60
50
30mA/ch, VF = 3.95V
320mA/ch, VF = 3.25V
160mA/ch, VF = 3.15V
15mA/ch, VF = 3.5V
4.2mA/ch, VF = 3.4V
40
30
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
Backlight Current Matching vs. Temperature
Charge Pump Output Turn On Characteristic
(VIN = 3.6V; 20mA/ch)
(VIN = 3.6V; 0mA/ch; COUT = 2.2µF)
22
21
20
19
4.0
2.0
0.0
4.0
3.0
2.0
1.0
0.0
Channel 1 - Channel 6/7
18
17
16
-40
-15
10
35
60
85
Temperature (°C)
Time (50µs/div)
Turn On to 1X Mode Flash
Turn On to 1.5X Mode Flash
(VIN = 4.2V; 300mA/ch)
(VIN = 3.6V; 300mA/ch)
4
2
0
4
2
VFL_EN
(2V/div)
VFL_EN
(2V/div)
0
VOUT
(2V/div)
VFLX
VOUT
4
2
0
4
2
0
(2V/div)
VFLX
(2V/div)
(2V/div)
600
400
200
0
600
400
200
0
IIN
IIN
(200mA/div)
(200mA/div)
Time (50µs/div)
Time (50µs/div)
w w w . a n a l o g i c t e c h . c o m
6
2861.2009.02.1.2
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
