AT1729P - Aimtron Technology

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

1

Features

• Low input voltage: 2.5V to 6V

• 3-Channels PWM Control:

2 Boost Controller(CH1,CH2)

1 Inverting Controller (CH3)

• 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 AT1729 is a PWM DC/DC converter control

IC with 3 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 Dia

g

ram

Aimtron reserves the right without notice to change this circuitry and specifications.

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

2

Pin Configuration

Ordering Information

Part number Package Marking

AT1729 TSSOP16 AT1729P

Pin Description

Symbol Pin

No.(A/B)

Descript Symbol Pin

No.(A/B)

Descript

FB1 1 CH1 error amplifier output OUT3 9 CH3 output for Pch-

MOSFET

IN1 2 CH1 inverting input to

error amplifier

OUT2 10 CH2 output for Nch-

MOSFET

IN2 3CH2 inverting input to

error amplifier

VCC 11 Power Supply

GND 4 Control blocks ground OUT1 12 CH1 output for Nch-

MOSFET

PGND 5 Power blocks ground REG 13 Regulated voltage output

FB2 6 CH2 error amplifier output CT 14 Oscillator timing

capacitor

IN3 7 CH3 inverting input to

error amplifier

CS3 15 Sotf-start for CH3

FB3 8 CH3 error amplifier output CS1_2 16 Soft-star for CH1/2

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

3

Absolute Maximum Ratings

Rated ValueParameter Condition

Min. Max.

Unit

Power Supply Voltage — - +6 V

Source Average Current of OUT1

OUT2, OUT3

—--50mA

Sink Average Current of OUT1

OUT2, OUT3

—-50mA

Input Voltage to Error Amplifier — - 6.5 V

Continuous power dissipation TSSOP16（Ta=+25℃） -500mW

Operating temperature — -30 +85 0C

Junction temperature — - +125 0C

Storage temperature — -40 +150 0C

Lead temperature — - +300 0C

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)

ValuesParameter Symbol

Min. Typ. Max.

Unit

Power supply voltage VCC 2.5 -- 5.5 Ｖ

Oscillation frequency fOSC 100 500 1000 KHz

Operating temperature TOP -30 +25 +85 °C

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

4

Electrical Characteristics

(VCC = 3V,Ta =+25℃, unless otherwise noted.)

ValuesParameter Symbol Condition

Min. Typ. Max.

Unit

Input Supply Range VCC 2.5 - 5.5 V

VCC Undervoltage

Lockout UVLO 1.95 2.05 2.15 V

Reference Voltage VTH1/2/3 0.97 1.00 1.03 V

Reference Voltage

line-regulation VTH-Line

VCC=2.5V to 5.5V -110mV

Rference Variation

with Temperature

Ta =-30℃ to +85℃-0.51.5%

Operation Current ICC1 IN=FB 1.2 3.0 3.8 mA

Entire device

Operation Current ICC2 No Switch, No load 1.0 - 1.9 mA

Input Offset Voltage VIO --10mV

Source Current

(CH1,2,3) IOH

VFB = VREG -0.5V -160 -120 -80 μA

Sink Current(CH1,3) IOL VFB = 0.5V 2.0 2.5 3.0 mA

Sink Current(CH2) IOL VFB = 0.5V 0.5 1.0 1.5 mA

Source current Variation

with temperature

Ta =-30℃ to +85℃--20%

Sink current Variation

with temperature

Ta =-30℃ to +85℃--20%

Unity Gain Bandwidth fT-2.0-MHz

Common Mode Input

Voltage Range VCOM 0.2 - 1.5 V

Error amplifier

DC Open Loop Gain AV-80-dB

Frequency fosc CT =150pF 480 550 620 kHz

High Level Voltage CT =150pF 1.0 V

Low Level Voltage CT =150pF 0.5 V

Variation with Power

Supply

Vcc=2.5V to 5.5V2

%

Sawtooth wave

oscillator (OSC)

Variation with

temperature

Ta =-30℃ to +85℃7%

Regulated Voltage VREG CO =0.1μF2.16 2.20 2.24 V

Variation with Power

Supply

Vcc=2.5V to 5.5V1.5 %

Variation with

Temperature

Ta =-30℃ to +85℃1.5 %

Regulated Voltage

for internal Control

Block

Source Current IREG -40 - -17 mA

Charge Current of

CS1_2(Source) ICS1_2

CS1_2=0V -3.0 - -5.0 µA

Soft-Start and Duty

Section

Charge Current of

CS3(Sink) ICS3

CS3=0V -3.0 - -5.0 µA

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

5

Max. Duty of CH1,2 fOSC=500KHz 80 87 91 %

Max. Duty of CH3 fOSC=500KHz 77 86 91 %

Invalid TL threshold

voltage of CS1_2 -0.3- V

Invalid TL threshold

voltage of CS3 -1.32.- V

Threshold Voltage of

FB1,2 VTLTH1 2 -1.32- V

Threshold Voltage of

FB3 VTLTH3 -0.3- V

Start up count Count - 216 -

Timer Latch Section

(TL)

Start up time TTL 105 119 137 ms

Rise time of OUT1,2 tr1_2

CO =1000pF between

OUT1,2-GND 20 25 35 ns

Rise time of OUT3 tr3

CO =1000pF between

VCC-OUT3 20 25 35 ns

Fall time of OUT1,2 tf1_2

CO =1000pF between

OUT1,2-GND 20 25 35 ns

Fall time of OUT3 tf3

CO =1000pF between

VCC-OUT3 20 25 35 ns

High Level on

Resistance of OUT1,2 R1_2AH

IOUT1_2= -50mA 3710

Ω

Low Level on

Resistance of OUT1,2 R1_2AL

IOUT1_2=50mA 3711

Ω

High Level on

Resistance of OUT3 R3AH

IOUT3= -50mA 3710

Ω

Output Section

Low Level on

Resistance of OUT3 R3AL

IOUT1_2=50mA 3711

Ω

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

6

Typical Application Circuit

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

7

Package Outline 16-pin TSSOP

MILLIMETERS INCHES

SYMBOL MIN TYP MAX MIN TYP MAX

A 1.05 1.10 1.20 0.041 0.043 0.047

A1 0.05 0.10 0.15 0.002 0.004 0.006

A2 - 1.00 1.05 - 0.039 0.041

b 0.20 0.25 0.28 0.008 0.010 0.011

C - 0.127 - - 0.005 -

D 4.90 5.075 5.10 0.193 0.1998 0.200

E 6.20 6.40 6.60 0.244 0.252 0.260

E1 4.30 4.40 4.50 0.170 0.173 0.177

L 0.50 0.60 0.70 0.020 0.024 0.028

e - 0.65 - - 0.026 -

y - - 0.076 - - 0.003

θ0°8°0°8°

AT1729

Preliminary Product Information

3-Channel PWM 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 WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879 Email: service@aimtron.com.tw

8

Reflow Condition (IR/Convection or VPR Reflow)

Reference JEDEC Standard J-STD-020A

Classification Reflow Profiles

Convection or

IR/Convction

VPR

Average Heating Rate(180°C to peak) 5°C/second max. 10°C/second max.

Preheat Temperature(125±20°C) 120 seconds max.

Temperature maintained above 180°C10~150 seconds

Time within 5°C of actual Peak

Temperature

10~20 seconds 60 seconds

Peak Temperature Range(Note 1) 219~225°C or

235~240°C

219~225°C or

235~240°C

Cooling Rate 6°C /second max. 10°C/second max.

Time 25°C to Peak Temperature 6 minutes max.

*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.

Package Reflow Conditions

Pkg. Thickness ≥2.5mm

and all bags

Pkg. Thickness <2.5mm

and

Pkg. Volume ≥350 mm3

Pkg. Thickness <2.5mm

and

Pkg. Volume <350 mm3

Convection 219~225°CConvection 235~240°C

VPR 219~225°CVPR 235~240°C

IR/Convection 219~225°CIR/Convection 235~240°C