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480mA White LED 1x/1.5x/2x Charge Pump for
Backlighting and Camera Flash
1 μ F
1 μ F
INPUT
2.7V TO 5.5V
C1P
C1N
C2P
C2N
OUTPUT
UP TO 480mA
4.7 μ F
1 μ F
INP
IN
OUT
4.7 μ F
MAIN
FLASH
GND1
MAX1576
LED1
LED2
ON/OFF AND
CURRENT
SETTING
ENM1
ENM2
ENF1
ENF2
LED3
LED4
LED5
LED6
LED7
LED8
SETM
SETF
GND2
PGND
Figure 6. Providing Increased LED Current per LED
1 μ F
1 μ F
INPUT
2.7V TO 5.5V
C1P
C1N
C2P
C2N
OUTPUT
UP TO 260mA
4.7 μ F
1 μ F
INP
IN
OUT
4.7 μ F
MAIN
FLASH
GND1
MAX1576
LED1
LED2
IN
ON/OFF AND
CURRENT
SETTING
ENM1
ENM2
ENF1
ENF2
LED3
LED4
LED5
LED6
LED7
IN
LED8
SETM
SETF
GND2
PGND
Figure 7. Schematic for when Fewer than 8 LEDs is Acceptable
Driving Fewer than 8 LEDs
When driving fewer than 8 LEDs, two different connec-
tion schemes can be used. The first scheme is shown
in Figures 2 and 6, where LED_ is connected to the
adjacent LED_. This method allows increased current
through the LED and effectively allows total LED current
to be I LED multiplied by the number of pins connected.
The second method of connection is shown in Figure 7,
where standard white LEDs are used and fewer than 8
are connected. This scheme does not alter current
through each LED but ensures that the unused LED_ is
properly terminated.
Input Ripple
For LED drivers, input ripple is more important than out-
put ripple. Input ripple is highly dependent on the
source supply’s impedance. Adding a lowpass filter to
the input further reduces input ripple. Alternately,
increasing C IN to 10μF cuts input ripple in half with only
a small increase in footprint. The 1x mode always has
very low input ripple.
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