AAT3153
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 20mA Load)
100
90
80
70
60
50
10mA
VF = 3.1V
20mA
VF = 3.4V
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Supply Voltage (V)
Time (100µs/div)
Turn-On to 1.5X Mode
(VIN = 3.8V; 20mA Load)
Turn-On to 2X Mode
(VIN = 2.8V; 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-Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
Current Matching vs. Temperature
20.2
Channel 1
Channel 2
EN
(2V/div)
20.0
19.8
19.6
19.4
19.2
Channel 5
VF
(1V/div)
Channel 3
Channel 4
Channel 6
IIN
(100mA/div)
60
-40
-20
0
20
40
80
Time (100µs/div)
Temperature (°C)
3153.2005.12.0.93
5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
