ADM8843(Rev0) Просмотр технического описания (PDF) - Analog Devices

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Компоненты Описание

производитель

ADM8843
(Rev.:Rev0)

4 White LED Backlight Driver

Analog Devices 

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADM8843

VOUT 1

C2+ 2

ISET 3

GND 4

PIN 1

INDICATOR

ADM8843

TOP VIEW

(Not to Scale)

12 CTRL2

11 C2–

10 GND

9 GND

Figure 2. Pin Configuration

Table 3. 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 give 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.

5–8

FB1–FB4

LED1–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. 0 | Page 5 of 16

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