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 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)