AIM AT1731 Datasheet

AT1731

2-Channel PWM Controller for LCD Bias

Preliminary

Features

• Low input voltage: 2.5V to 7V

• 2-Channels PWM Control:
1 Boost Controller(CH1)
1 Inverting Controller (CH2)

• Adjustable Soft start time and maximum duty
cycle

• Built-in timer latch for short circuit protection:
Delay time=216/(Switching frequency)

• Built-in under-voltage lockout, thermal
shutdown.

• High operating frequency: 100kHz to 1MHz

Applications

• LCD Displays Bias

• Power Supply for general equipment

Block Diagram

General Description

The AT1731 is a PWM DC/DC converter control
IC with 2 channel outputs that can directly drive
power MOSFET. This IC ia suitable for very small
DC/DC converters because of their small and thin
package(1.1 mm max.), and high operation
frequency (up to 1.0 MHz).

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

1

AT1731

2-Channel PWM Controller for LCD Bias

Pin Configuration

Preliminary

Ordering Information

Part number Package Marking

AT1731 TSSOP16 AT1731P

-

Pin Description

Symbol Pin No. Descript Symbol Pin No. Descript

FB1

IN1

NC

GND

PGND

GND

IN2

FB2

1 CH1 error amplifier output

2 CH1 inverting input to

error amplifier

3 Don’t connect

4 Control blocks ground

5 Power blocks ground

6 Control blocks ground

7

CH2 inverting input to

error amplifier

8 CH2 error amplifier output

OUT1

OUT2

NC

VCC

REG

CT

CS2

CS1

9 CH1 output for Nch-

MOSFET

10 CH2 output for Pch-

MOSFET

11 Don’t connect

12 Power Supply

13 Regulated voltage output

14 Oscillator timing

capacitor

15 Sotf-start for CH2

16 Soft-star for CH1

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

2

AT1731

2-Channel PWM Controller for LCD Bias

Absolute Maximum Ratings

Preliminary

Rated ValueParameter Condition

Unit

Min. Max.

Power Supply Voltage — - +8 V
Source Average Current of OUT1

—--50mA
OUT2
Sink Average Current of OUT1

—-50mA
OUT2
Input Voltage to Error Amplifier — - 6.5 V

Continuous power dissipation

TSSOP16（Ta=+25℃）

Operating temperature — -30 +85
Junction temperature — - +125
Storage temperature — -40 +150
Lead temperature — - +300

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may affect device reliability.

-500mW

0

C

0

C

0

C

0

C

Recommended Operating Conditions

(Ta=+250C)

Va lu esParameter Symbol

Min. Typ. Max.

Power supply voltage V
Oscillation frequency f

Operating temperature T

CC

OSC

OP

2.5 -- 7

100 500 1000 KHz

-30 +25 +85 °C

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

3

Unit

Ｖ