1x/1.5x/2x White LED Charge Pump with Two
LDOs in 4mm x 4mm Thin QFN
1 μ F
1 μ F
INPUT
2.7V TO 5.5V
C1P
PIN
C1N
C2P
C2N
LDO1
10 μ F
IN
GND
LDO2
1 μ F
1 μ F
OUTPUT
MAIN ON/OFF
ENM2
MAX8631X
MAX8631Y
OUT
10 μ F
UP TO 480mA
MAIN
FLASH
AND DIMMING
ENM1
FLASH ON/OFF
AND DIMMING
ON/OFF
VOLTAGE
SELECTION
ENF
ENLDO
P1
P2
M1
M2
M3
M4
F1
F2
F3
F4
SETM
SETF REFBP
PGND
6.81k Ω
4.12k Ω
0.01 μ F
Figure 3. Dimming Using Single-Wire, Serial-Pulse Interface
1 μ F
1 μ F
INPUT
2.7V TO 5.5V
C1P
PIN
C1N
C2P
C2N
LDO1
10 μ F
IN
GND
LDO2
1 μ F
1 μ F
OUTPUT
10 μ F
ENM2
MAX8631X
MAX8631Y
OUT
UP TO 480mA
MAIN
FLASH
ENM1
ON/OFF AND
VOLTAGE
SELECTION
ENF
ENLDO
P1
P2
M1
M2
M3
M4
F1
F2
F3
F4
SETM
SETF REFBP
PGND
6.81k Ω
4.12k Ω
0.01 μ F
Figure 4. Providing Increased LED Current per LED
12
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