Charge Pump for Backlight/Flash/RGB LEDs
with Safety Timer
Typical Operating Characteristics (continued)
(T A = +25°C, unless otherwise noted.)
OPERATING WAVEFORMS 1X MODE
MAX8879 toc09
OPERATING WAVEFORMS 1.5X MODE
MAX8879 toc10
V OUT
V IN
I IN
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
100mA/div
V OUT
V IN
I IN
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
100mA/div
1 μ s/div
OPERATING WAVEFORMS 2X MODE
MAX8879 toc11
0
V SDA
1 μ s/div
MAIN BACKLIGHT STARTUP WAVEFORM
MAX8879 toc12
0
5V/div
V OUT
V IN
I IN
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
100mA/div
V OUT
1V/div
0
1 μ s/div
MAIN STARTUP WITH RGB ALREADY ON
MAX8879 toc13
0
I IN
1ms/div
FLASH STARTUP WAVEFORM
MAX8879 toc14
200mA/div
0
V SDA
V OUT
5V/div
1V/div
V SDA
5V/div
1V/div
V OUT
0
0
I IN
1ms/div
200mA/div
0
I IN
1ms/div
200mA/div
0
_______________________________________________________________________________________
5
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