AAT3156
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
100
90
4.1mA
V
F
= 2.9V
10.2mA
V
F
= 3.1V
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
= 3.8V; 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)
20.2
Current Matching vs. Temperature
Channel 2
20.0
Channel 1
EN
(2V/div)
Current (mA)
V
F
(1V/div)
I
IN
(100mA/div)
19.8
19.6
Channel 3
19.4
19.2
-40
-20
0
20
40
60
Channel 5
Channel 4
Channel 6
80
100µs/div
µ
Temperature (°C)
°
3156.2005.06.1.1
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
