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