High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
Typical Characteristics
V
IN
= 3.5V, C
IN
= C
CP
= C1 = C2 = 1µF, T
A
= 25°C, unless otherwise noted.
Charge Pump to Load Switch
(1.5X Mode, 4x19mA Load)
V
IN
(500mV/div)
V
CP
(1V/div)
V
DIODE
(500mV/div)
I
IN
(50mA/div)
AAT3140
Charge Pump to Load Switch
(1.5X Mode, 4x30mA Load)
V
IN
(500mV/div)
V
CP
(1V/div)
V
DIODE
(500mV/div)
I
IN
(50mA/div)
5ms/div
5ms/div
Charge Pump to Load Switch
(2X Mode, 4x19mA Load)
V
IN
(500mV/div)
V
CP
(1V/div)
V
DIODE
(500mV/div)
I
IN
(50mA/div)
Charge Pump to Load Switch
(2X Mode, 4x30mA Load)
V
IN
(500mV/div)
V
CP
(1V/div)
V
DIODE
(500mV/div)
I
IN
(50mA/div)
5ms/div
5ms/div
Load Switch to Charge Pump
(1.5X Mode, 4x19mA Load)
V
IN
(1V/div)
V
CP
(4V/div)
V
DIODE
(500mV/div)
I
IN
(50mA/div)
V
IN
(1V/div)
V
CP
(4V/div)
V
DIODE
(500mV/div)
I
IN
(50mA/div)
Load Switch to Charge Pump
(1.5X Mode, 4x30mA Load)
2ms/div
2ms/div
3140.2005.03.1.1
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
