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
Turn-On to 1X Mode
(4x19mA Load)
EN/SET
(2V/div)
V
CP
(4V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
EN/SET
(2V/div)
V
CP
(4V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Turn-On to 1X Mode
(4x30mA Load)
Time (100µs/div)
Time (100µs/div)
Turn-On to 1.5X Mode
(4x19mA Load)
EN/SET
(2V/div)
V
CP
(4V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Turn-Off from Full-Scale 2X Mode
EN/SET
(2V/div)
V
DIODE
(2V/div)
I
IN
(200mA/div)
Time (100µs/div)
Time (100µs/div)
Flash Section Turn-On
(V
IN
= 3.5V; I
OUT
= 100mA; EN/SET = GND)
Flash Section Turn-On
(V
IN
= 3.5V; I
OUT
= 200mA; EN/SET = GND)
EN_FLSH
(2V/div)
V
OUT
(2V/div)
I
IN
(100mA/div)
EN_FLSH
(2V/div)
V
OUT
(2V/div)
I
IN
(100mA/div)
Time (100µs/div)
Time (100µs/div)
6
2801.2006.04.1.3
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
