PRODUCT DATASHEET
AAT3104178
ChargePump
TM
Typical Characteristics
V
IN
= 3.6V, C
IN
= C
OUT
= C1 = 1μF; T
A
= 25°C, unless otherwise noted.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
1X Mode Turn-On Waveform
(V
IN
= 4.2V; Load = 120mA)
2X Mode Turn-On Waveform
(V
IN
= 3.6V; Load = 120mA)
V
LED
(2V/div)
I
IN
(200mA/div)
V
OUT
(2V/div)
EN
(1V/div)
0
0
V
LED
(2V/div)
I
IN
(250mA/div)
V
OUT
(2V/div)
EN
(1V/div)
Time (200µs/div)
0
0
0
0
0
0
Time (200µs/div)
2X Mode Turn-Off Waveform
(V
IN
= 3.6V; Load = 120mA)
2X Mode Output Ripple
(V
IN
= 3.6V; Load = 120mA)
I
IN
(250mA/div)
0
V
LED
(2V/div)
0
V
OUT
(AC Coupled)
(20mV/div)
0
EN
(1V/div)
0
V
IN
(AC Coupled)
(5mV/div)
0
Time (200µs/div)
Time (0.4µs/div)
1mA to 30mA LED Current Step
(V
IN
= 4.2V)
V
LED
2V/div
I
IN
200mA/div
V
OUT
2V/div
EN
1V/div
0
0
0
30mA to 1mA LED Current Step
(V
IN
= 4.2V)
V
LED
(2V/div)
I
IN
(200mA/div)
V
OUT
(2V/div)
EN
(1V/div)
0
0
0
0
0
Time (80µs/div)
Time (80µs/div)
3104.2008.09.1.0
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