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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
Pin Description (continued)
PIN
NAME
FUNCTION
WLED AND RGB
WLED Current Sink Regulator. Current into WLED1 is based upon the programmed internal I 2 C
D7
E7
F6
F7
G6
G5
G4
G3
E6
E5
F5
WLED1
WLED2
WLED3
WLED4
WLED5
WLED6
WLED7
WLED8
RLED
GLED
BLED
registers. Connect WLED1 to the cathodes of external LEDs. WLED1 is high impedance during
shutdown. If unused, short WLED1 to PV3.
WLED Current Sink Regulator. Current into WLED2 is based upon the programmed internal I 2 C
registers. Connect WLED2 to the cathodes of external LEDs. WLED2 is high impedance during
shutdown. If unused, short WLED2 to PV3.
WLED Current Sink Regulator. Current into WLED3 is based upon the programmed internal I 2 C
registers. Connect WLED3 to the cathode of an external WLED. WLED3 is high impedance during
shutdown. If unused, short WLED3 to PV3.
WLED Current Sink Regulator. Current into WLED4 is based upon the programmed internal I 2 C
registers. Connect WLED4 to the cathode of an external LED. WLED4 is high impedance during
shutdown. If unused, short WLED4 to P3.
WLED Current Sink Regulator. Current into WLED5 is based upon the programmed internal I 2 C
registers. Connect WLED5 to the cathode of an external WLED. WLED5 is high impedance during
shutdown. If unused, short WLED5 to either PV3 or disable the regulator.
WLED Current Sink Regulator. Current into WLED6 is based upon the programmed internal I 2 C
registers. Connect WLED6 to the cathode of an external WLED. WLED6 is high impedance during
shutdown. If unused, short WLED6 to either PV3 or disable the regulator.
WLED Current Sink Regulator. Current into WLED7 is based upon the programmed internal I 2 C
registers. Connect WLED7 to the cathode of an external WLED. WLED7 is high impedance during
shutdown. If unused, short WLED7 to either PV3 or disable the regulator.
WLED Current Sink Regulator. Current into WLED8 is based upon the programmed internal I 2 C
registers. Connect WLED8 to the cathode of an external WLED. WLED8 is high impedance during
shutdown. If unused, short WLED8 to either PV3 or disable the regulator.
Red LED Connection. The brightness is set up by I 2 C. ON/OFF is synchronized with the PWM signal
applied to PLAYR pin. RLED maximum brightness is enabled/disabled through the serial interface.
Green LED Connection. The brightness is set up by I 2 C. ON/OFF is synchronized with the PWM signal
applied to PLAYG pin. GLED maximum brightness is enabled/disabled through the serial interface.
Blue LED Connection. The brightness is set up by I 2 C. ON/OFF is synchronized with the PWM signal
applied to PLAYB pin. BLED maximum brightness is enabled/disabled through the serial interface.
BOOST CONVERTER
B6
A6
B7
OUT
SW
LX
Step-Up Converter Output. Bypass OUT to GND with a 1 F F ceramic capacitor. During shutdown, OUT
is pulled to PGND3 by an internal 1M I resistor.
Isolation Switch Output for the Step-Up Converter. SW is internally connected to the drain of a p-channel
MOSFET and used to isolate the output of the step-up from the input during shutdown. If true shutdown is
not required, SW can be left open with the input supply connected directly to the inductor.
Inductor Switching Connection. Connect the inductor between LX and SW. For most applications, use
a 22 F H inductor.
STATUS INDICATOR
F4
Maxim Integrated
CHG
Charging Status Output. CHG is an open-drain output that goes low when the battery is charging.
On/off is operated by I 2 C. CHG is high impedance when the IC is in shutdown mode. Enable CHG
through the I 2 C interface.
19
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