AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
100
10mA
V
F
= 3.1V
90
20mA
V
F
= 3.4V
Turn-On to 1X Mode
(V
IN
= 4.2V; 20mA Load)
Efficiency (%)
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(200mA/div)
80
70
60
50
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Supply Voltage (V)
100µs/div
µ
Turn-On to 1.5X Mode
(V
IN
= 3.5V; 20mA Load)
Turn-On to 2X Mode
(V
IN
= 2.8V; 20mA Load)
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(200mA/div)
100µs/div
µ
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(200mA/div)
100µs/div
µ
Turn-Off from 1.5X Mode
(V
IN
= 3.5V; 20mA Load)
20.4
Current Matching vs. Temperature
EN
(2V/div)
Current (mA)
V
F
(1V/div)
I
IN
(100mA/div)
20.2
20.0
19.8
19.6
19.4
19.2
19.0
-40
Channel 2
Channel 4
Channel 3
Channel 1
-20
0
20
40
60
80
500µs/div
µ
Temperature (°C)
°
3152.2005.08.1.2
5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
