MAX8647_0709 Datasheet, PDF (13/15 Pages) Maxim Integrated Products – Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN

Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
1μF
1μF
INPUT
2.7V TO 5.5V
1μF
I²C PORT
ON/OFF AND
BRIGHTNESS
V_LOGIC
1.7V TO 5.5V
0.1μF
C1P
IN
GND
C1N C2P
C2N
NEG
EP
MAX8647
LED1
SDA
LED2
SCL
LED3
LED4
V_DD
LED5
LED6
1μF
WHITE OR
RGB LED
D1
D2
D3
D4
D5
D6
Figure 5. MAX8647 Typical Application Circuit
1μF
1μF
INPUT
2.7V TO 5.5V
1μF
SERIAL-
PULSE
INTERFACE
C1P
IN
GND
C1N C2P
C2N
NEG
EP
MAX8648
LED1
LED2
ENA
LED3
ENB
LED4
ENC
LED5
LED6
1μF
WHITE OR
RGB LED
D1
D2
D3
D4
D5
D6
Figure 6. MAX8648 Typical Application Circuit
1μF
1μF
INPUT
2.7V TO 5.5V
1μF
SERIAL-
PULSE
INTERFACE
C1P
IN
GND
C1N C2P
C2N
NEG
EP
MAX8648
LED1
LED2
ENA
LED3
ENB
LED4
ENC
LED5
LED6
Figure 7. Driving LEDs with Multiple Supplies
1μF
WHITE OR
RGB LED V1
V2
V3
D1
D2
D3
D4
D5
D6
RED CHARGE
INDICATOR
______________________________________________________________________________________ 13