AT1380A

Preliminary Product Information

Switching Regulator Controller for LCD Bias

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

Fax: 886-3-563-0879

4

Electrical Characteristics

Values

Parameter

Symbol

Condition

Min. Typ. Max.

Unit

Reset voltage for

falling Vcc. OUT

remains off if Vcc is

below this level.

V

R

--

1.8

1.9

V

VCC Under voltage

Lockout

(U.V.L.O.)

Startup voltage for

rising Vcc.

V

TH

--

2.4

2.5

2.6

V

Charging current

I

CS

V

-1.5

-1.0

-0.7 μA

Soft start

Voltage at soft start

completion

V

ts

--

0.7

0.8

0.9

V

Charging current

I

CPC

V

-1.5

-1.0

-0.7 μA

Short circuit

detection (S.C.P.)

Threshold voltage

V

tPC

--

0.7

0.8

0.9

V

Oscillation frequency

f

OSC

R

400

500

600

kHz

Frequency input

Stability

f

∆V

V

--

2

10

%

Sawtooth waveform

oscillator (OSC)

Frequency variation

with temperature

f

∆T

5

--

%

Input threshold

Voltage

V

T

V

480

500

520

mV

V

V

T∆V

V

--

5

20

mV

V

Temperature

V

T∆T

1

--

%

Input bias current

I

B

V

-1.0

-0.2

1.0

μ

A

Voltage gain

A

V

--

70

100

145 V/V

Frequency bandwidth

BW

A

--

6

--

MHz

V

OM

+

0.78 0.87

--

V

Maximum output

voltage range

V

OM

_

--

--

0.05

0.2

V

Output source current

I

OM

+

--

-40

-24

μ

A

Error amplifier

Output sink current

I

OM

_

V

24

40

--

μ

A

Idle period

adjustment section

Maximum duty cycle

T

DUTY

R

f

75

--

85

%

V

OH1

R

1.0

1.2

--

V

V

OH2

R

I

0.8

1.0

--

V

V

OL1

R

--

0.1

0.2

V

Output voltage

V

OL2

R

I

--

0.1

0.2

V

Output source current

I

O

+

R

--

-40

-30

mA

Output sink current

I

O

-

R

40

70

--

mA

Output section

Pull down resistance

R

O

--

20

30

40

ｋΩ