AAT3151
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, D
X
= 20mA
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(100mA/div)
4.1mA
90
10.2mA
20mA
Efficiency (%)
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, D
X
= 20mA
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(100mA/div)
100µs/div
µ
EN
(2V/div)
CP
(2V/div)
V
SINK
(500mV/div)
I
IN
(100mA/div)
Turn On to 2X Mode
V
IN
= 2.8V, D
X
= 20mA
100µs/div
µ
Turn Off from 1.5X Mode
V
IN
= 3.5V, D
X
= 20mA
EN
(2V/div)
V
F
(1V/div)
I
IN
(200mA/div)
200µs/div
µ
3151.2004.10.0.6
5
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