AAT2806_07 Datasheet, PDF (7/16 Pages) Advanced Analogic Technologies – Dual High Efficiency Charge Pump for White LED and Flash Applications

AAT2806
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Typical Characteristics– White LED Backlight Driver Section
Turn-On to 1X Mode
(V_IN = 4.2V; 20mA Load)
Turn-On to 1.5X Mode
(V_IN = 3.5V; 20mA Load)
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Time (100µs/div)
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Time (100µs/div)
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Turn-On to 2X Mode
(V_IN = 2.8V; 20mA Load)
Time (100µs/div)
EN
(2V/div)
V_F
(1V/div)
I_IN
(100mA/div)
Turn-Off from 1.5X Mode
(V_IN = 3.5V; 20mA Load)
Time (500µs/div)
Efficiency vs. Supply Voltage
100
10mA
20mA
VF = 3.1V
VF = 3.4V
90
80
70
60
50
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Supply Voltage (V)
Current Matching vs. Temperature
20.4
20.2 ^{Channel 2}
20.0
Channel 4
19.8
19.6
Channel 3 Channel 1
19.4
19.2
19.0
-40
-20
0
20
40
60
80
Temperature (°C)
2806.2007.09.1.9
7