Datasheet AT1729 Datasheet (AIM)

Page 1
AT1729
3-Channel PWM Controller for LCD Bias
Preliminary
Features
• Low input voltage: 2.5V to 7V
• 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
Block Diagram
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).
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
Page 2
AT1729
3-Channel PWM Controller for LCD Bias
Pin Configuration
Preliminary
Ordering Information
Part number Package Marking
AT1729 TSSOP16 -
Pin Description
Symbol Pin
No.(A/B)
FB1
IN1
IN2
GND
PGND
FB2
IN3
FB3
1 CH1 error amplifier output
2 CH1 inverting input to
error amplifier
CH2 inverting input to
error amplifier
4 Control blocks ground
5 Power blocks ground 6 CH2 error amplifier output
CH3 inverting input to
error amplifier
8 CH3 error amplifier output
Descript Symbol Pin
No.(A/B)
OUT3
OUT2
VCC
OUT1
REG
CT
CS3
CS1_2
9 CH3 output for Pch-
10 CH2 output for Nch-
11 Power Supply
12 CH1 output for Nch-
13 Regulated voltage output 14 Oscillator timing
15 Sotf-start for CH3
16 Soft-star for CH1/2
Descript
MOSFET
MOSFET
MOSFET
capacitor
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
Page 3
AT1729
3-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, OUT3 Sink Average Current of OUT1
—-50mA OUT2, OUT3 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: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw
Unit
Page 4
AT1729
3-Channel PWM Controller for LCD Bias
Electrical Characteristics
(VCC = 3V,Ta =+25, unless otherwise noted.)
Preliminary
Entire device
Error amplifier
Sawtooth wave oscillator (OSC)
Regulated Voltage for internal Control Block
Input Supply Range
VCC Undervoltage Lockout
Reference Voltage V
Reference Voltage line-regulation
V
CC
UVLO 1.95 2.05 2.15 V
REF
V
REF-Line
Rference Variation with Temperature
Operating Current I
CC
Input Offset Voltage V Source Current (CH1,2,3) Sink Current(CH1,2,3) I
I
OH
OL
Source current Variation with temperature
Sink current Variation with temperature
Unity Gain Bandwidth f Common Mode Input Voltage Range
T
V
COM
DC Open Loop Gain A
Frequency fosc
High Level Voltage
Low Level Voltage
Variation with Power Supply Variation with temperature
Regulated Voltage V
REG
Variation with Power Supply Variation with Temperature
Source Current I
REG
Va lu esParameter Symbol Condition
Min. Typ. Max.
2.5 -- 7.0 V
0.98 1.00 1.02 V
VCC=2.5V to 7.0V
15mV
Ta =-30 to +85
0.5 1.5 %
Duty=50%,
3.0 3.8 mA
-160 -120 -80
IO
f
=500KHz
OSC
VFB = V
REG
-0.5V
VFB = 0.5V 2.0 2.5 3.0 mA Ta =-30 to +85
Ta =-30 to +85
2.0 MHz
0.2 1.5 V
V
C
=150pF 480 550 620
T
=150pF 1.0
C
T
=150pF 0.5
C
T
80 dB
Vcc=2.5V to 7V 2
Ta =-30 to +85
CO =0.1μF
2.16 2.20 2.24 V
Vcc=2.5V to 7V
Ta =-30 to +85
-40 - -15
Unit
10 mV
μA
20 %
20 %
kHz
V
V
%
7%
1.5 %
1.5 %
mA
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
Page 5
AT1729
3-Channel PWM Controller for LCD Bias
Soft-Start and Duty Section
Timer Latch Section (TL)
Thermal Shuntdown Section
Output Section
Charge Current of CS1_2(Source)
Charge Current of CS3(Sink)
Max. Duty of CH1,2
Max. Duty of CH3
Invalid TL threshold voltage of CS1_2
Invalid TL threshold voltage of CS3
Threshold Voltage of FB1,2 Threshold Voltage of FB3
Start up count Count
Start up time T
Threshold Temperature T
Rise time of OUT1,2 t
Rise time of OUT3 t
Fall time of OUT1,2 t
Fall time of OUT3 t
High Level on Resistance of OUT1,2 Low Level on Resistance of OUT1,2 High Level on Resistance of OUT3 Low Level on Resistance of OUT3
I
CS1_2
I
V
TLTH1 2
V
TLTH3
R
1_2AH
R
R
R3
CS3
f
=500KHz
OSC
f
=500KHz
OSC
TL
OH
CO =1000pF between
r1_2
OUT1,2-GND CO =1000pF between
r3
VCC-OUT3 CO =1000pF between
f1_2
OUT1,2-GND CO =1000pF between
f3
VCC-OUT3 I
=-150mA
OUT1_2
I
=150mA
3AH
AL
OUT1_2
I
OUT3
I
OUT1_2
=-150mA
=150mA
1_2AL
Preliminary
-1.0 mA
1.0 mA
80 87 90 %
80 86 90 %
0.3 V
1.32. V
1.32 V
0.3 V
16
105 119 137 ms
140
20 25 35 ns
20 25 35 ns
20 25 35 ns
20 25 35 ns
2.5 4.0 5.5
2.5 4.0 5.5
2.5 4.0 5.5
2.5 4.0 5.5
0
C
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
Page 6
AT1729
3-Channel PWM Controller for LCD Bias
Typical Application Circuit
Preliminary
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
Page 7
AT1729
3-Channel PWM Controller for LCD Bias
Package Outline 16-pin TSSOP
Preliminary
SYMBOL
MILLIMETERS INCHES
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
θ 0° 8° 0° 8°
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
Page 8
AT1729
C
3-Channel PWM Controller for LCD Bias
Reflow Condition (IR/Convection or VPR Reflow)
Reference JEDEC Standard J-STD-020A
Classification Reflow Profiles
Preliminary
Convection or
IR/Convction
Average Heating Rate(180°C to peak) 5°C/second max. 10°C/second max. Preheat Temperature(125±20°C) Temperature maintained above 180°C Time within 5°C of actual Peak
Temperature Peak Temperature Range(Note 1)
Cooling Rate Time 25°C to Peak Temperature
*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.
120 seconds max. 10~150 seconds 10~20 seconds 60 seconds
219~225°C or 235~240°C 6°C /second max. 10°C/second max. 6 minutes max.
219~225°C or 235~240°C
Package Reflow Conditions
Pkg. Thickness 2.5mm and all bags
Convection 219~225 VPR 219~225
°C
IR/Convection 219~225
°C
°C
Pkg. Thickness <2.5mm and
Pkg. Volume 350 mm
Pkg. Thickness <2.5mm and
3
Pkg. Volume <350 mm
Convection 235~240 VPR 235~240 IR/Convection 235~240
VPR
3
°C
°C
°
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
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