Rainbow-electronics MAX6948B Manual de usuario descargar pdf (Pagina 8)

High-Efficiency PWM LED Driver with Boost

Converter and Five Constant-Current GPIO Ports

MAX6948B

Pin Description

Pin Configuration

MAX6948B

TOP VIEW

(BUMP IN BOTTOM)

WLP

(2.31mm x 2.31mm)

A2 A3 A4 A5

B1 B2 B3 B4 B5

SCL SDA V+

AD0 V+ V+

GND N.C. I.C. COMP

GND FB PGND PGND

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.

RST

Active-Low Reset Input

A3 SCL I

C-Compatible, Serial-Clock Input

A4 SDA I

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

C Logic Supply Voltage. Bypass V

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

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

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Rainbow-electronics MAX6948B Manual de usuario Pagina 8

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