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

4

Electrical Characteristics

(Vin=3.0V, SHDN=Vin, VDDP=VDDN=10V, Ta=+25℃, unless otherwise noted)

Parameter

Symbol

Test Condition

Min. Typ. Max Units

Input operating voltage

Vin

2.6

―

5.5

V

Input under-voltage threshold

Vin Rising

2.45

2.5

2.55

V

Vin UVLO hysteresis

―

120

―

mV

Vin Quiescent Current

Iin

1

1.5

mA

Vin Shutdown Current

SHDN=GND

1

10

uA

VDDP Quiescent Current

0.5

0.8

mA

VDDP Shutdown Current

SHDN=GND, VDDP=15V

1

10

uA

VDDN Quiescent Current

0.5

0.8

mA

VDDN Shutdown Current

SHDN=GND, VDDN=15V

1

10

uA

Main Step-Up Converter

Main Output Voltage Range

Vin

15

V

Feedback Regulation voltage

Ta=+25℃

1.21 1.23 1.24

V

FB Input Bias Current

-50

―

50

nA

Operating Frequency

Ta=+25℃

1.1

1.2

1.3

MHz

Oscillator Maximum Duty Cycle

80

85

90

%

Load Regulation

0.2

%

Line Regulation

2.6V < Vin < 5.5V

0.1

%/V

Trans-conductance

317

us

LX Switch On-Resistance

)

0.25

0.5

Ω

LX Leakage Current

0.1

20

uA

LX Current Limit

Vin=3.3V

2.0

2.2

2.5

A

Maximum RMS LX Current

1.87

A

Current

Iss

2

uA

Soft-Start

Reset switch

resistance

100

Ω

Short- circuit Capacitor charge

current

-

1.0

-

uA

Negative Charge-Pump

VDDN Input Supply Range

Vin

15

V

Operating Frequency

Hz

FBN Feedback Regulation

Voltage

-50

0

+50

mV

FBN Input Bias Current

-50

+50

nA

P-ch On-Resistance

(ON)

5

10

Ω

2

4

Ω

N-ch On-Resistance

(ON)

20

KΩ

Maximum RMS SWN Current

50

mA

Positive Charge-Pump

VDDP Input Supply Range

Vin

15

V

Operating Frequency

Hz

FBP Feedback Regulation

Voltage

1.21 1.23 1.24

V

FBP Input Bias Current

-50

+50

nA

P-ch On-Resistance

5

10

Ω