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480mA White LED 1x/1.5x/2x Charge Pump for
Backlighting and Camera Flash
Typical Operating Characteristics (continued)
(V IN = 3.6V, EN_ = IN, Circuit of Figure 1, R SETM = 9.09k Ω , R SETF = 4.12k Ω , T A = +25°C, unless otherwise noted.)
100
10
1
LED CURRENT vs. R SETM
100% BRIGHTNESS SETTING
100
10
1
LED CURRENT vs. R SETF
100% BRIGHTNESS SETTING
1
10
100
1
10
100
R SETM (k Ω )
OPERATING WAVEFORMS (1x MODE)
MAX1576 toc12
R SETF (k Ω )
OPERATING WAVEFORMS (1.5x MODE)
MAX1576 toc13
V OUT
V IN
V OUT
4 MAIN LEDs AT 20mA EACH
400ns/div
OPERATING WAVEFORMS (2x MODE)
MAX1576 toc14
50mV/div
AC-COUPLED
20mV/div
AC-COUPLED
V OUT
50mV/div
V OUT
V IN
V EN1F
V EN2F
4 MAIN LEDs AT 20mA EACH
400ns/div
FLASH RESPONSE
MAX1576 toc15
V OUT
50mV/div
AC-COUPLED
V IN
20mV/div
AC-COUPLED
5V/div
AC-COUPLED
V IN
V IN
20mV/div
AC-COUPLED
I IN
500mA/div
500mA/div
I OUT
4 MAIN LEDs AT 20mA EACH
FLASH AT 400mA
500mV/div
AC-COUPLED
400ns/div
V OUT
400 μ s/div
4 MAIN LEDs AT 20mA EACH. 400mA FLASH
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5
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