Rainbow-electronics MAX8848Z Bedienungsanleitung PDF herunterladen (Seite 7)

High-Performance Negative Charge Pump

for 7 White LEDs in 3mm x 3mm Thin QFN

MAX8848Y/MAX8848Z

_______________________________________________________________________________________ 7

Pin Description

Pin Configuration

GND

C2P

LED4

LED2

LED5

1 2

LED7

12 11 9

CPWM (ENB)

ENA

( ) FOR MAX8848Y ONLY

LED1

NEG

C1N

C2N

MAX8848Y

MAX8848Z

C1P LED3

LED6

THIN QFN

TOP VIEW

NAME FUNCTION

MAX8848Y MAX8848Z

1 1 IN

Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Bypass IN to GND

with a 1FF ceramic capacitor as close as possible to the IC. IN is high imped-

ance during shutdown. Connect IN to the anodes of all the LEDs.

2 2 GND

Ground. Connect GND to system ground and the input bypass capacitor as

close as possible to the IC.

3 3 C1P

Transfer Capacitor 1 Positive Connection. Connect a 1FF ceramic capacitor from

C1P to C1N.

4 4 C2P

Transfer Capacitor 2 Positive Connection. Connect a 1FF ceramic capacitor from

C2P to C2N.

5 5 C2N

Transfer Capacitor 2 Negative Connection. Connect a 1FF ceramic capacitor

from C2P to C2N. An internal 10kI resistor pulls C2N to GND during shutdown.

6 6 C1N

Transfer Capacitor 1 Negative Connection. Connect a 1FF ceramic capacitor

from C1P to C1N.

7 7 NEG

Charge-Pump Negative Output. Connect a 1FF ceramic capacitor from NEG to

GND. In shutdown, an internal 10kI resistor pulls NEG to GND. Connect the

exposed pad to NEG directly under the IC.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

MAX8848Y/MAX8848Z 1

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