ADD5203

Rev. 0 | Page 8 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

PWMI

2

SEL1

3

SEL2

4

VDDIO

5

SDA

6

SCL

7

FB1

18 R_FPWM

19 C_FPWM

20 PGND

21 PGND

NOTES

1. NC = NO CONNECT.

2. CONNECT THE EXPOSED PADDLE TO GND.

16 NC

15 FB8

ADD5203

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 7. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

PWMI

PWM Signal Input.

2

SEL1

Dimming Mode Selection 1.

3

SEL2

Dimming Mode Selection 2.

4

VDDIO

Internal Linear Regulator Output. This regulator provides power to the ADD5203.

5

SDA

Serial Data Input/Output.

6

SCL

Serial Clock Input.

7

FB1

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin.

8

FB2

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin.

9

FB3

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin.

10

FB4

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin.

11

AGND

Analog Ground.

12

FB5

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin. If unused, connect to GND.

13

FB6

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin. If unused, connect to GND.

14

FB7

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin. If unused, connect to GND.

15

FB8

Regulated Current Sink. Connect the bottom cathode of the LED string to this pin. If unused, connect to GND.

16

NC

No Connection.

17

Full-Scale LED Current Set. A resistor from this pin to ground sets the LED current up to 30 mA.

18

R_FPWM

Dimming frequency adjustment pin with an external resistor.

19

C_FPWM

Dimming frequency adjustment pin with an external capacitor.

20

PGND

Power Ground.

21

PGND

Power Ground.

22

OVP

Overvoltage Protection.

23

SW

Drain Connection of the Internal Power FET.

24

SW

Drain Connection of the Internal Power FET.

25

SHDN

Shutdown Control for PWM Input Operation Mode. Active low.

26

VIN

Supply Input. Must be locally bypassed with a capacitor to ground.

27

FSLCT

Frequency Select. A resistor from this pin to ground sets the boost switching frequency from 350 kHz to 1 MHz.

28

COMP

Compensation for Boost Converter. A capacitor and a resistor are connected in series between ground and

this pin for stable operation and an optional capacitor can be connected from this pin to ground.

EP

Exposed Paddle. Connect the exposed paddle to ground.