MAX8648 Maxim Integrated Products, MAX8648 Datasheet - Page 7

• Manufacturer Part Number: MAX8648
• Description: (MAX8647 / MAX8648) Ultra-Efficient Charge Pumps
• Manufacturer: Maxim Integrated Products

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MAX8647
8–13
14
15
16
—
—
1
2
3
4
5
6
7
Six White/RGB LEDs in 3mm x 3mm Thin QFN
PIN
MAX8648
14, 15, 16
8–13
—
—
—
—
1
2
3
4
5
6
7
_______________________________________________________________________________________
ENC, ENB, ENA
LED6–LED1
NAME
GND
NEG
C1P
C2P
C2N
C1N
SDA
SCL
V
EP
IN
DD
Ultra-Efficient Charge Pumps for
Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Bypass IN to GND with a
1µF ceramic capacitor as close as possible to the IC. IN is high impedance during
shutdown. Connect IN to the anodes of all the LEDs.
Ground. Connect GND to system ground and the input bypass capacitor as close as
possible to the IC.
Transfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor from C1P
to C1N.
Transfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P
to C2N.
Transfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor from C2P
to C2N. An internal 10kΩ resistor pulls C2N to GND during shutdown.
Transfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor from C1P
to C1N.
Charge-Pump Negative Output. Connect a 1µF ceramic capacitor from NEG to GND. In
shutdown, an internal 10kΩ resistor pulls NEG to GND. Connect the exposed paddle to
NEG directly under the IC.
LED Current Regulators. Current flowing into LED_ is based on the internal registers.
Connect LED_ to the cathodes of the external LEDs. LED_ is high impedance during
shutdown. For the MAX8647, program any unused LED_ to off and LED_ can be
shorted to ground or left unconnected. For the MAX8648, short any unused LED_ to IN
prior to power-up to disable the corresponding current regulator.
I
I
Logic-Input Supply Voltage. Connect to the supply voltage driving SDA and SCL.
Bypass V
Enable and Serial-Pulse Dimming Control. ENA controls LED1, LED2, and LED3. ENB
controls LED4 and LED5. ENC controls LED6. Drive EN_ logic-high to turn on the IC
and enable the corresponding LED_ at 24mA each. Drive an individual EN_ logic-low
for greater than 4ms to turn off the corresponding-current regulators or drive all three
EN_ low to place the IC in shutdown. See the Serial-Pulse Dimming Control (MAX8648)
section.
Exposed Paddle. Connect to NEG.
2
2
C Data Input. Data is read on the rising edge of SCL.
C Clock Input. Data is read on the rising edge of SCL.
DD
to GND with a 0.1µF ceramic capacitor.
FUNCTION
Pin Description
7