AAT3151B Datasheet, PDF (5/15 Pages) Advanced Analogic Technologies – High Efficiency 1X/1.5X Charge Pump For White LED Applications

AAT3151B
High Efficiency 1X/1.5X Charge Pump
For White LED Applications
Typical Characteristics
3151B Backlight Efficiency vs. Supply Voltage
100
90
20mA
80
70
60
50
1mA
10.2mA
40
30
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
Supply Voltage (V)
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Turn-On to 1X Mode
(V_IN = 4.2V; 20mA Load)
Time (100µs/div)
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Turn-On to 1.5X Mode
(V_IN = 3.5V; 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)
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)
3151B.2007.09.1.0
5