Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Typical Characteristics–White LED Backlight Driver Section
V
IN
= 3.5V, C
IN
= 2.2µF, C
CP
= C1 = C2 = 1.0µF; T
A
= 25°C, unless otherwise noted.
AAT2801
Line Response
(1X Mode; 4x19mA Load)
Line Response
(1X Mode; 4x30mA Load)
V
IN
(0.5V/div)
V
LED
(20mV/div)
V
CP
(0.5V/div)
I
D
(10mA/div)
Time (1ms/div)
V
IN
(0.5V/div)
V
LED
(20mV/div)
V
CP
(0.5V/div)
I
D
(10mA/div)
Time (1ms/div)
Line Response
(1.5X Mode; 4x19mA Load)
V
IN
(0.5V/div)
V
DX
(20mV/div)
V
CP
(0.5V/div)
I
DX
(10mA/div)
Time (1ms/div)
Line Response
(1.5X Mode; 4x30mA Load)
V
IN
(0.5V/div)
V
LED
(20mV/div)
V
CP
(0.5V/div)
I
D
(10mA/div)
Time (1ms/div)
Line Response
(I
OUT
= 100mA; I_D
X
= 4x19mA; 1.5X Mode)
V
IN
(0.5V/div)
V
CP
(0.5V/div)
V
DX
(20mV/div)
I
DX
(10mA/div)
V
F
(10mV/div)
Time (1ms/div)
8
2801.2006.04.1.3