AAT3151 Datasheet, PDF (5/14 Pages) Advanced Analogic Technologies – High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

AAT3151
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
100
90
4.1mA
80
VF = 2.9V
70
60
50
40
1mA
10.2mA
30
VF = 2.7V
VF = 3.1V
20mA
VF = 3.4V
20
10
0
2.6 2.8 2.9 3.1 3.2 3.4 3.6 3.7 3.9 4.0 4.2
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)
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)
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)
3151.2005.12.1.7
5