Rainbow Electronics MAX8848Z - Manual (Page 9)

High-Performance Negative Charge Pump
for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848Y/MAX8848Z
_______________________________________________________________________________________ 9
Figure 1. Functional Diagram and Application Circuit
C2
1 µF
C1
1 µF
C1P
GND
IN
SEL
MIN
EP
NEG
LED1
V IN
LED2
LED3
LED4
LED5
LED6
LED7
CURRENT
REGULATOR
INVERTING CHARGE PUMP
C1N
1MHz
OSCILLATOR
C3
1 µF
C4
1
µF
C2P C2N
FB
PWM
DIMMING
360kI
LED
ENABLE
CURRENT
SOURCE
CONTROL
THERMAL
DERATING
AND
PROTECTION
CURRENT
REGULATOR
C25
0.22 µF
<CPWM>
CURRENT
REGULATOR
CURRENT
REGULATOR
CURRENT
REGULATOR
CURRENT
REGULATOR
CURRENT
REGULATOR
NOTE: () FOR MAX8848Y ONLY, < > FOR MAX8848Z ONLY
MAX8848Y
MAX8848Z
ENABLE
AND
DIMMING
CONTROL
INPUTS
V IN
2.7V TO 5.5V
ENA
(ENB)