NCP5623B データシートの表示（PDF） - ON Semiconductor

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NCP5623B

Triple Output I2C Controlled RGB LED Driver

ON Semiconductor 

NCP5623B

PIN ASSIGNMENT

PIN Name

Type

Description

1

C1P

POWER One side of the external charge pump capacitor (CFLY ) is connected to this pin, associated with C1N,

pin 12 (Note 1).

2

GND

POWER This pin is the GROUND signal for the analog and digital blocks and must be connected to the system

ground. This pin is the GROUND reference for the DC/DC converter and the output current control.

The pin must be connected to the system ground, a ground plane being strongly recommended.

3

LED3

INPUT, This pin sinks to ground and monitors the current flowing into the LED3, intended to be used in illu-

POWER mination application (Note 2). The Anode of the associated LED shall be connected to the Vout pin.

4

LED2

INPUT, This pin sinks to ground and monitors the current flowing into the LED2, intended to be used in illu-

POWER mination application (Note 2). The Anode of the associated LED shall be connected to the Vout pin.

5

LED1

INPUT, This pin sinks to ground and monitors the current flowing into the LED1, intended to be used in illu-

POWER mination application (Note 2).

6

AGND ANALOG This pin copies the Analog Ground and must be connected to the system ground plane.

GROUND

7

SDA

INPUT, This pin carries the data provided by the I2C protocol. The content of the SDA byte is used to pro-

DIGITAL gram the mode of operation and to set up the output current (Note 1).

8

IREF

INPUT, This pin provides the reference current, based on the internal band−gap voltage reference, to control

ANALOG the output current flowing in the LED. A 1% tolerance, or better, resistor shall be used to get the

highest accuracy of the LED biases. An external current mirror can be used to bias this pin to dynam-

ically set up the I−LED peak current.

In no case shall the voltage at IREF pin be forced either higher or lower than the 600 mV provided by

the internal reference.

9

SCL

INPUT, This pin carries the I2C clock to control the Charge Pump converter and to set up the output current.

DIGITAL The SCL clock is associated with the SDA signal.

10

VOUT OUTPUT, This pin provides the output voltage supplied by the Charge Pump converter. The Vout pin must be

POWER bypassed by 1 mF ceramic capacitor located as close as possible to the VOUT pin to properly bypass

the output voltage to ground. The circuit shall not operate without such bypass capacitor connected

across the Vout pin and Ground (Note 1).

The output voltage is internally clamped to 5.5 V maximum in the event of a no load situation. On the

other hand, the output current is limited to 40 mA (typical) in the event of a short circuit to ground.

11

VBAT

INPUT, This pin is the input Battery voltage to supply the analog and digital blocks. The pin must be de-

POWER coupled to ground by a 1mF or higher ceramic capacitor (Note 1).

12

C1N

POWER One side of the external charge pump capacitor (CFLY ) is connected to this pin, associated with C1P,

pin 1 (Note 1)

1. Using low ESR ceramic capacitor, X5R type, is mandatory to optimize the Charge Pump efficiency and to reduce the EMI.

2. The peak current is 37 mA for each LED, the total charge pump output DC current being limited to 75 mA

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