AT1729 Preliminary 3-Channel PWM Controller for LCD Bias 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 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). Applications • LCD Displays Bias • Power Supply for general equipment Block Diagram 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: [email protected] 1 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Pin Configuration Ordering Information Part number AT1729 Package TSSOP16 Marking - Pin Description Symbol Pin No.(A/B) Descript Symbol Pin No.(A/B) FB1 1 CH1 error amplifier output OUT3 9 IN1 2 10 IN2 3 GND 4 CH1 inverting input to OUT2 error amplifier CH2 inverting input to VCC error amplifier Control blocks ground OUT1 PGND FB2 5 6 Power blocks ground CH2 error amplifier output 13 14 IN3 7 FB3 8 CH3 inverting input to CS3 error amplifier CH3 error amplifier output CS1_2 REG CT 11 12 Descript CH3 output for PchMOSFET CH2 output for NchMOSFET Power Supply 15 CH1 output for NchMOSFET Regulated voltage output Oscillator timing capacitor Sotf-start for CH3 16 Soft-star for CH1/2 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: [email protected] 2 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Absolute Maximum Ratings Parameter Condition Power Supply Voltage Source Average Current of OUT1 OUT2, OUT3 Sink Average Current of OUT1 OUT2, OUT3 Input Voltage to Error Amplifier Continuous power dissipation Operating temperature Junction temperature Storage temperature Lead temperature — — Rated Value Min. Max. +8 -50 Unit V mA — - 50 mA — TSSOP16（Ta=+25℃） — — — — -30 -40 - 6.5 500 +85 +125 +150 +300 V mW 0 C 0 C 0 C 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) Parameter Power supply voltage Oscillation frequency Operating temperature Symbol VCC fOSC TOP Values Min. 2.5 100 -30 Typ. -500 +25 Unit Max. 7 1000 +85 Ｖ KHz °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: [email protected] 3 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Electrical Characteristics (VCC = 3V,Ta =+25℃, unless otherwise noted.) Parameter Symbol Condition Values Unit Min. Typ. Max. Input Supply Range 7.0 V UVLO 1.95 2.05 2.15 V Reference Voltage VREF 0.98 1.00 1.02 V Reference Voltage line-regulation VREF-Line 1 5 mV 0.5 1.5 % 3.0 3.8 mA 10 mV -160 -120 -80 μA 2.0 3.0 mA 20 % 20 % VCC Lockout Entire device VCC Undervoltage Operating Current ICC Input Offset Voltage Source Current (CH1,2,3) Sink Current(CH1,2,3) Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth Common Mode Input Voltage Range DC Open Loop Gain VIO Frequency IOH IOL Duty=50%, fOSC=500KHz VFB = VREG -0.5V VFB = 0.5V Ta =-30℃ to +85℃ -- 2.5 Ta =-30℃ to +85℃ fT 2.0 VCOM 0.2 AV fosc High Level Voltage Sawtooth wave oscillator (OSC) Low Level Voltage Variation with Power Supply Variation with temperature Regulated Voltage Variation with Power Regulated Voltage Supply for internal Control Variation with Block Temperature Source Current VCC=2.5V to 7.0V Ta =-30℃ to +85℃ Rference Variation with Temperature Error amplifier 2.5 VREG CT =150pF 480 1.5 80 550 V dB 620 kHz CT =150pF 1.0 V CT =150pF 0.5 V Vcc=2.5V to 7V 2 Ta =-30℃ to +85℃ 7 CO =0.1μF Vcc=2.5V to 7V % % 2.16 2.20 2.24 V 1.5 % 1.5 % -15 mA Ta =-30℃ to +85℃ IREG MHz -40 - 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: [email protected] 4 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Charge Current of CS1_2(Source) Charge Current of CS3(Sink) Soft-Start and Duty Max. Duty of CH1,2 Section Max. Duty of CH3 Invalid TL threshold voltage of CS1_2 Invalid TL threshold voltage of CS3 Threshold Voltage of FB1,2 Timer Latch Section Threshold Voltage of (TL) FB3 Start up count Start up time Thermal Shuntdown Threshold Temperature Section Output Section ICS1_2 -1.0 mA ICS3 1.0 mA fOSC=500KHz fOSC=500KHz 90 90 % % V 1.32. V VTLTH1 2 1.32 V VTLTH3 0.3 V Count TTL 216 119 105 TOH tr1_2 Rise time of OUT3 tr3 Fall time of OUT1,2 tf1_2 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 87 86 0.3 Rise time of OUT1,2 Fall time of OUT3 80 80 tf3 R1_2AH R1_2AL R3AH R3AL 137 0 140 CO =1000pF between OUT1,2-GND CO =1000pF between VCC-OUT3 CO =1000pF between OUT1,2-GND CO =1000pF between VCC-OUT3 IOUT1_2=-150mA ms C 20 25 35 ns 20 25 35 ns 20 25 35 ns 20 25 35 ns 2.5 4.0 5.5 Ω IOUT1_2=150mA 2.5 4.0 5.5 Ω IOUT3=-150mA 2.5 4.0 5.5 Ω IOUT1_2=150mA 2.5 4.0 5.5 Ω 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: [email protected] 5 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Typical Application Circuit 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: [email protected] 6 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Package Outline 16-pin TSSOP SYMBOL A A1 A2 b C D E E1 L e y θ MILLIMETERS MIN TYP MAX 1.05 1.10 1.20 0.05 0.10 0.15 1.00 1.05 0.20 0.25 0.28 0.127 4.90 5.075 5.10 6.20 6.40 6.60 4.30 4.40 4.50 0.50 0.60 0.70 0.65 0.076 0° 8° MIN 0.041 0.002 0.008 0.193 0.244 0.170 0.020 0° INCHES TYP 0.043 0.004 0.039 0.010 0.005 0.1998 0.252 0.173 0.024 0.026 - MAX 0.047 0.006 0.041 0.011 0.200 0.260 0.177 0.028 0.003 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: [email protected] 7 AT1729 Preliminary 3-Channel PWM Controller for LCD Bias Reflow Condition (IR/Convection or VPR Reflow) Reference JEDEC Standard J-STD-020A Classification Reflow Profiles Convection or IR/Convction Average Heating Rate(180°C to peak) 5°C/second max. 120 seconds max. Preheat Temperature(125±20°C) 10~150 seconds Temperature maintained above 180°C Time within 5°C of actual Peak 10~20 seconds Temperature Peak Temperature Range(Note 1) 219~225°C or 235~240°C Cooling Rate 6°C /second max. 6 minutes max. Time 25°C to Peak Temperature VPR 10°C/second max. 60 seconds 219~225°C or 235~240°C 10°C/second max. *1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions. Package Reflow Conditions Pkg. Thickness ≥2.5mm Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm and and and all bags Pkg. Volume ≥350 mm3 Pkg. Volume <350 mm3 Convection 219~225°C VPR 219~225°C IR/Convection 219~225°C Convection 235~240°C VPR 235~240°C IR/Convection 235~240°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: [email protected] 8