NCP5608 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

NCP5608

Multiple LED Charge Pump Driver

ON Semiconductor 

NCP5608

PIN FUNCTION DESCRIPTION

Pin

Symbol

Type

Description

1

AGND

GROUND

This pin is the NCP5608 analog ground and shall be connected to the system ground. Care

must be observed to minimize the total parasitic inductance between the pin and the ground

plane.

2

IREFFL OUTPUT, ANALOG This pin is used to set up the current reference for the FLASH output currents (LED5 to

LED8). The reference current is derived from the internal bandgap voltage to ground by

means of an external resistor. (Note 1)

3

IREFBK OUTPUT, ANALOG This pin is used to set up the current reference for the BACK LIGHT output currents (LED1

to LED4). The reference current is derived from the internal bandgap voltage to ground by

means of an external resistor. (Note 1)

4

SDA

INPUT, DIGITAL This pin, associated with the SCL signal, carries the DATA signal to set up the selected

output LED current.

The DATA signal is built with a single SDA line to support the I2C protocol.

5

SCL

INPUT, DIGITAL This is the clock signal associated with the SDA pins. The pin carries the standard CLOCK

signal to operate the I2C protocol.

6

CCMP ANALOG, INPUT This pin is connected to the internal I2C bias network and must be either left open, or

bypassed to ground by a 10 nF ceramic capacitor when the I2C voltage drops below 1.8 V.

Such a capacitor compensate the voltage drop during normal operation, keeping in mind it is

not mandatory when the I2C voltage is 1.8 V and above.

7

LED1

INPUT, POWER This pin sinks to ground the current flowing into the first LED, and is intended to be used in

backlight application. The current is limited to 30 mA max. (Note 2)

8

LED2

INPUT, POWER This pin sinks to ground the current flowing into the second LED, and is intended to be used

in backlight application. The current is limited to 30 mA max. (Note 2)

9

LED3

INPUT, POWER This pin sinks to ground the current flowing into the third LED, and is intended to be used in

backlight application. The current is limited to 30 mA max. (Note 2)

10

LED4

INPUT, POWER This pin sinks to ground the current flowing into the fourth LED, and is intended to be used

in backlight application. The current is limited to 30 mA max. (Note 2)

On the other hand, LED4 can be disconnected when only three LEDs are used in the

backlight application. (Table 1)

11

LED5

INPUT, POWER This pin sinks to ground the current flowing into the fifth LED (100 mA max), and is intended

to be used in Flash application. (Note 2)

12

LED6

INPUT, POWER This pin sinks to ground the current flowing into the sixth LED (100 mA max), and is

intended to be used in Flash or high power application. (Note 2)

13 PWRGND

POWER

This pin provides the ground reference for the power elements and must be connected to

the system ground by a heavy track. Using the ground plane technique is strongly

recommended. Care must be observed to minimize the total parasitic inductance between

the pin and the ground plane.

14

LED7

INPUT, POWER This pin sinks to ground the current flowing into the seventh LED (100 mA max), and is

intended to be used in flash or high power application. (Note 2)

15

LED8

INPUT, POWER This pin sinks to ground the current flowing into the eighth LED (100 mA max), and is

intended to be used in flash or high power application. (Note 2)

16

C1N

POWER

This pin is the second side of the C1 fly capacitor.

17

C1P

POWER

This pin is the first side of the C1 fly capacitor.

18

VOUT OUTPUT, POWER This pin provides the output power to the external LED. Since the regulation is based on a

current loop, the voltage will varies as the output current varies in the application. The Vout

pin must be bypassed to GND by a 4.7 mF ceramic capacitor. (Note 3)

19

PVBAT

INPUT, POWER This pin provides the supply voltage to the charge pump converter. The pin must be

connected to the AVbat supply source and bypassed to GND by a 10 mF/16 V ceramic

capacitor. (Note 3) Using a power plane is recommended.

20

C2N

POWER

This pin is the second side of the C2 fly capacitor.

21

C2P

POWER

This pin is the first side of the C2 fly capacitor.

22

C3P

POWER

This pin is the second side of the C3 fly capacitor.

23

C3N

POWER

This pin is the first side of the C3 fly capacitor.

24

AVbat

INPUT, POWER This pin provides the supply voltage to the analog and digitals blocks. The pin must be

connected to the PVbat supply source and bypassed to GND by a 1 mF/16 V ceramic

capacitor. (Note 3) Using a power plane is recommended.

1. To achieve a good accuracy of the LED current, 1% tolerance resistor, with 100 ppm stability, or better, shall be used. The reference current

is internally mirrored and sized according to the programmed value for a given external LED.

2. Total DC−DC output current is limited to 500 mA.

3. Ceramic X7R, ESR < 50 mW ESL < 0.5 nH, SMD types capacitors are mandatory to achieve the Iout specifications. On the other hand, care

must be observed to take into account the DC bias impact on the capacitance value; see ceramic capacitor manufacturer data sheets.

http://onsemi.com

4

Share Link: