AAT2842

High-Current Charge Pump with S

Control and Dual LDO for Backlight and Flash

2842.2007.09.1.2

3

Pin Descriptions (continued)

Pin Configuration

TQFN44-28-0.4

TQFN44-28-0.45

(Top View)

(Top View)

N.B. Not recommended for new designs.

1

2

3

4

5

6

7

89

10

27

28

26

25

24

23

22

11

12

13

14

21

20

19

18

17

16

15

BL1

BSET

FSET

AGND

CT

REF

FBB

IN

PGND

C2-

C2+

ENL

FL4

FL3

1

2

3

4

5

6

7

89

10

28

27

26

25

24

23

22

11

12

13

14

21

20

19

18

17

16

15

BL1

BSET

FSET

AGND

CT

REF

FBB

IN

PGND

C2-

C2+

ENL

FL4

FL3

Pin #

Symbol

Description

24

FENS

Flash enable and serial control input. FENS is the on/off control for the flash and the S

input to serially control the flash LED brightness relative to the maximum current set by the

resistor at FSET.

25

BENS

Backlight enable and serial control input. BENS is the on/off control for the backlight and the

S

set by the resistor at BSET.

26

BL4

Backlight LED 4 current sink. BL4 controls the current through Backlight LED 4. Connect the

cathode of Backlight LED 4 to BL4. If not used, connect BL4 to OUT.

27

BL3

Backlight LED 3 current sink. BL3 controls the current through Backlight LED 3. Connect the

cathode of Backlight LED 3 to BL3. If not used, connect BL3 to OUT.

28

BL2

Backlight LED 2 current sink. BL2 controls the current through Backlight LED 2. Connect the

cathode of Backlight LED 2 to BL2. If not used, connect BL2 to OUT.

EP

Exposed paddle (bottom); connect to PGND as closely as possible to the device.