ADM8843 데이터 시트보기 (PDF) - Analog Devices

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ADM8843

Four White LED Backlight Driver

Analog Devices 

Data Sheet

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADM8843

VOUT 1

C2+ 2

ISET 3

GND 4

ADM8843

TOP VIEW

(Not to Scale)

12 CTRL2

11 C2–

10 GND

9 GND

NOTES

1. CONNECT THE EXPOSED PADDLE TO GND.

Figure 2. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1

VOUT

Charge Pump Output. A 2.2 µF capacitor to ground is required on this pin. Connect VOUT to the anodes of all the LEDs.

2

C2+

Flying Capacitor 2 Positive Connection.

3

ISET

Bias Current Set Input. The current flowing through the RSET resistor, ISET, is gained up by 120 to provide the ILED

current. Connect a resistor, RSET, to GND to set the bias current as VSET/RSET. Note that VSET = 1.18 V.

4, 9, 10 GND

Device Ground Pins.

5 to 8 FB1 to FB4

LED1 to LED4 Cathode Connection and Charge Pump Feedback. The current flowing in these LEDs is 120 times

the current flowing through RSET, ISET. When using fewer than four LEDs, this pin can be left unconnected or

connected to GND.

11

C2−

Flying Capacitor 2 Negative Connection.

12

CTRL2

Digital Input. 3 V CMOS Logic. Used with CTRL1 to control the shutdown operation of the main and sub LEDs.

13

CTRL1

Digital Input. 3 V CMOS Logic. Used with CTRL2 to control the shutdown operation of the main and sub LEDs.

14

C1−

Flying Capacitor 1 Negative Connection.

15

VCC

Positive Supply Voltage Input. Connect this pin to a 2.6 V to 5.5 V supply with a 4.7 µF decoupling capacitor.

16

C1+

Flying Capacitor 1 Positive Connection.

–

EP

Expose Paddle. Connect the exposed paddle to GND.

Rev. E | Page 5 of 16

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