AT1731A

Preliminary Product Information

DC-DC Power IC for TFT Panel

7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

Fax: 886-3-563-0879

2/8/2006 REV:1.1

2

Pin Configurations

1

2

3

413

14

15

16

SHDN

Vin

FB

COMP

VDDN

9

10

11

12

LX

FBN

SWP

PGND

5

6

7

8

VDDP

REF

SCP

GND

SWN

SS

FBP

Ordering Information

Part Number

Package

Marking

AT1731AP

TSSOP-16

Date Code

AT1731AP_GRE

TSSOP-16 , Green

, Date code with one bottom line

: Date Code

Pin Description

Pin N0.

Symbol I / O Description

1

VDDP

P

Positive Charge-Pump Driver Supply Voltage. Bypass to power ground

with 0.1uF capacitor.

2

VDDN

P

Negative Charge-Pump Driver Supply Voltage. Bypass to power

ground with 0.1uF capacitor.

3

LX

I

Main Step-up Regulator N-MOS Drain. Place output diode and

inductor.

4

Vin

P

Input voltage pin of the device .Vin may range from 2.6V to 5.5V

5

COMP

O

Compensation pin for the main step-up converter. A series RC is

connected to this pin.

6

FB

I

Main Step-Up Regulator Feedback Input. Connect a resistive divider

from main output to FB to analog ground.

7

/SHDN

I

Active-low shutdown control input. Pull SHDN low to force the

controller into shutdown. If unused, connect SHDN to Vin for normal

operation.

8

REF

O

Internal Reference Output. External load capability up to 50uA.

9

GND

P

Analog Ground.

10

SS

I

Soft-start input. The capacitor connected to this pin to sets the

current-limited start time.

11

FBP

I

Positive Charge-Pump Regulator Feedback Input. Connect a resistive

divider from the positive charge-pump output to FBP to analog

ground.

12

SCP

I

Short Circuit Protection.

13

FBN

I

Negative Charge-Pump Regulator Feedback Input. Connect a resistive

divider from the negative charge-pump output to FBN to the reference.

14

SWN

O

Negative Charge-Pump Driver Output. Output high level is VDDN and

low level is PGND.

15

SWP

O

Positive Charge-Pump Driver Output. Output high level is VDDP and

low level is PGND.

16

PGND

P

Power Ground.