AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Typical Characteristics
Unless otherwise noted, V
IN
= 3.5V, C
IN
= C
OUT
= C
1
= C
2
= 1µF, T
A
= 25°C.
Turn-On to Full-Scale Charge Pump
EN/SET
(1V/div)
OUT
(2V/div)
V
DIODE
(1V/div)
I
IN
(200mA/div)
Time (50µs/div)
Turn-On to Full-Scale Load Switch
EN/SET
(1V/div)
OUT
(2V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Time (50µs/div)
Charge Pump to Load Switch
(80mA)
V
IN
(10mV/div)
OUT
(2V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Time (50µs/div)
V
IN
(20mV/div)
OUT
(1V/div)
V
DIODE
(1V/div)
I
IN
(200mV/div)
Load Switch to Charge Pump
(80mA)
Time (50µs/div)
Turn-Off
V
IN
EN/SET
(1V/div)
20mV/div
80mA Load Characteristics
V
DIODE
(2V/div)
OUT
I
IN
(100mA/div)
V
DIODE
Time (200µs/div)
Time (1µs/div)
6
3123.2005.12.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
