AIM AT1732 Datasheet

AT1732

Preliminary

2-Channel PWM Controller for LCD Bias

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

Features

• Low input voltage: 2.5V to 7V

• 2-Channels PWM Control:
2 Boost Controller(CH1,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

General Description

The AT1732 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).

Block Diagram

AT1732

Preliminary

2-Channel PWM Controller for LCD Bias

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

Pin Configuration

Ordering Information

Part number Package Marking

AT1732 TSSOP16 AT1732P

-

Pin Description

Symbol Pin No. Descript Symbol Pin No. Descript

FB1

1 CH1 error amplifier output

OUT1

9 CH1 output for Nch-

MOSFET

IN1

2 CH1 inverting input to

error amplifier

NC

10

Don’t connect

IN2

3

CH2 inverting input to

error amplifier

OUT2

11 CH2 output for Nch-

MOSFET

GND

4 Control blocks ground

VCC

12 Power Supply

PGND

5 Power blocks ground

REG

13 Regulated voltage output

FB2

6 CH2 error amplifier output

CT

14 Oscillator timing

capacitor

NC

7

Don’t connect

REG

13 Regulated voltage output

Connect to pin13

NC

8

Don’t connect CS

16 Soft-star for CH1/2

AT1732

Preliminary

2-Channel PWM Controller for LCD Bias

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

Absolute Maximum Ratings

Rated ValueParameter Condition

Min. Max.

Unit

Power Supply Voltage — - +8 V
Source Average Current of OUT1
OUT2,

—--50mA

Sink Average Current of OUT1
OUT2

—-50mA

Input Voltage to Error Amplifier — - 6.5 V
Continuous power dissipation

TSSOP16（Ta=+25℃）

-500mW

Operating temperature — -30 +85

0

C

Junction temperature — - +125

0

C

Storage temperature — -40 +150

0

C

Lead temperature — - +300

0

C

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.

Recommended Operating Conditions

(Ta=+250C)

Va lu esParameter Symbol

Min. Typ. Max.

Unit

Power supply voltage V

CC

2.5 -- 7

Ｖ

Oscillation frequency f

OSC

100 500 1000 KHz

Operating temperature T

OP

-30 +25 +85 °C