AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
100
Turn On to 1X Mode
(V
IN
= 4.2V; 20mA Load)
10mA
90
20mA
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)
200µs/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)
200µs/div
µ
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(200mA/div)
200µs/div
µ
Turn Off from 1.5X Mode
(V
IN
= 3.5V; 20mA Load)
EN
(2V/div)
V
F
(1V/div)
I
IN
(100mA/div)
200µs/div
µ
3152.2004.12.0.9
5