AAT2806
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Typical Characteristics–White LED Backlight Driver Section
Turn-On to 1X Mode
(VIN = 4.2V; 20mA Load)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA Load)
EN
(2V/div)
EN
(2V/div)
CP
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
VSINK
(500mV/div)
IIN
(200mA/div)
IIN
(200mA/div)
Time (100µs/div)
Time (100µs/div)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA Load)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
EN
(2V/div)
EN
(2V/div)
VF
(1V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(100mA/div)
IIN
(200mA/div)
Time (100µs/div)
Time (500µs/div)
Efficiency vs. Supply Voltage
Current Matching vs. Temperature
100
90
80
70
60
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
20mA
10mA
VF = 3.4V
VF = 3.1V
Channel 2
Channel 4
Channel 3
Channel 1
50
-40
-20
0
20
40
60
80
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Temperature (°°C)
Supply Voltage (V)
2806.2006.04.1.8
7
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
