Rainbow Electronics MAX6948B - Manual (Page 8)

High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
8
MAX6948B
Pin Description
Pin Configuration
MAX6948B
TOP VIEW
(BUMP IN BOTTOM)
WLP
(2.31mm x 2.31mm)
A1
P0
P1
A2 A3 A4 A5
B1 B2 B3 B4 B5
SCL SDA V+
VDD AD0 V+ V+
P2 GND N.C. I.C. COMP
P3 GND FB PGND PGND
P4 OUT LEDSW LX LX
RST
C1 C2 C3 C4 C5
D1 D2 D3 D4 D5
E1 E2 E3 E4 E5
PIN NAME FUNCTION
A1 P0 GPIO Port. Open-drain I/O. P0 can be configured as a 30mA (max) constant sink current output.
A2 RST Active-Low Reset Input
A3 SCL I 2 C-Compatible, Serial-Clock Input
A4 SDA I 2 C-Compatible, Serial-Data I/O
A5, B4, B5 V+
Boost-Converter Supply Voltage and Positive Supply Voltage. Bypass V+ to GND with a 2.2FF or
higher value ceramic capacitor.
B1 P1 GPIO Port. Open-drain I/O. P1 can be configured as a 30mA (max) constant sink current output.
B2 V DD I 2 C Logic Supply Voltage. Bypass V DD to GND with a 0.1FF or higher value ceramic capacitor.
B3 AD0 Address Input. AD0 selects up to four device slave addresses (Table 13).
C1 P2 GPIO Port. Open-drain I/O. P2 can be configured as a 10mA (max) constant sink current output.
C2, D2 GND Ground. Connect to PGND.
C3 N.C. No Connection. Internally not connected.
C4 I.C. Internally Connected. Connect I.C. to GND for normal operation.
C5 COMP
Compensation Terminal for the Boost Converter. A capacitor from COMP to PGND determines the
boost-converter stability.
D1 P3 GPIO Port. Open-drain I/O. P3 can be configured as a 10mA maximum constant sink current output.
D3 FB
Load Current-Sense Voltage Feedback for the Boost Converter. A resistor between FB and PGND
sets the maximum load current.
D4, D5 PGND Power Ground. Connect PGND to GND.
E1 P4 GPIO Port. Open-drain I/O. P4 can be configured as a 10mA (max) constant sink current output.
E2 OUT Output Voltage Sense Input for Boost Converter
E3 LEDSW High-Voltage, Constant-Current Input. Connect LEDSW to the cathode-end of the WLED string.
E4, E5 LX Inductor Switch Node