Analog Integrated Circuit Device Data

Freescale Semiconductor

3

34844

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 34844 Pin Connections

Table 1. 34844 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 12.

Pin Number

Pin Name

Pin Function

Formal Name

Definition

1

VIN

Power

Input voltage

Input supply

2

PGNDB

Power

Power Ground

Power ground

3

SWB

Input

Switch node B

Boost switch connection B

4

SWA

Input

Switch node A

Boost switch connection A

5

PGNDA

Power

Power Ground

Power ground

6

A0/SEN

Input

Device Select

Address select, device select pin or OVP HW control

7

EN

Input

Enable

Enable pin (active high, internal pull-up)

8 - 17

I0-I9

Input

LED Channel

LED string connections

18

FAIL

Open Drain

Fault detection

Fault detected pin (open drain):

No Failure = Low impedance

Failure = High Impedance

19

ISET

Passive

Current set

LED current setting resistor

20

PIN

Input

Positive current scale

Positive input analog current control

21

NIN

Input

Negative current scale Negative input analog current control

22

SLOPE

Passive

Boost Slope

Boost slope compensation Setting resistor

23

VDC3

Output

Internal Regulator 3

Decoupling capacitor for internal phase locked loop power

24

CK

Input/Output

Clock signal

Clock synchronization pin (input for M/~S = low - internal pull-up, output

for M/~S = high)

25

PWM

Input

External PWM

External PWM input (internal pull-down)

VIN

PGNDB

SWB

SWA

PGNDA

A0/SEN

EN

IO

CK

VDC3

SLOPE

NIN

PIN

ISET

FAIL

I9

I1

I2

I3

I4

I5

I6

I7

I8

25

32

31

30

29

28

27

26

24

17

18

19

20

21

22

23

1

8

7

6

5

4

3

2

16

9

10

1112

131415

QFN - EP

5MM X 5MM

32 LEAD

EP GND

EP = Exposed Pad

TRANSPARENT

TOP VIEW