AT1730

AT1730 Preliminary Product Information 2-Channel PWM Controller for LCD Bias Features • Low input voltage: 2.4V to 6V • 2-Channels PWM Control: Nch-MOSFET driving(CH1) Nch/Pch-MOSFET driving(CH2) • Adjustable Soft start time and maximum duty cycle • Built-in timer latch for short circuit protection: • Built-in under-voltage lockout • High operating frequency: 100kHz to 1.0MHz • Low operating current: 2mA (typ.) General Description The AT1730 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 1.0MHz). Applications • LCD Displays Bias • Power Supply for general equipment Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications. 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 AT1730 Preliminary Product Information 2-Channel PWM Controller for LCD Bias Pin Configuration Ordering Information Part number AT1730P AT1730P_GRE Package TSSOP16 TSSOP16, Green Marking AT1730P AT1730P, Date Code with one bottom line Pin Description Symbol Pin No. Descript Symbol Pin No. Descript /SHDN IN2+ IN2FB2 SEL GND CS2 OUT2 1 2 3 4 5 6 7 8 ON/OFF Function OUT1 9 10 11 12 13 14 15 16 CH2 non-inverting input to CS1 error amplifier CH2 inverting input to VCC error amplifier CH2 error amplifier output VREF Selection of type of driven FB1 MOSFET Ground IN1Soft-Start for CH2 CH2 Output for Nch or Pch MOSFET SCP OSC CH1 output for NchMOSFET Soft-star for CH1 Power Supply Regulated voltage output CH1 error amplifier output CH1 inverting input to error amplifier Timing capacitor for timer latch delay Oscillator timing 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 2 AT1730 Preliminary Product Information 2-Channel PWM Controller for LCD Bias Absolute Maximum Ratings Parameter Power Supply Voltage Source Average Current of OUT1 OUT2, OUT3 Sink Average Current of OUT1 OUT2, OUT3 Output current of VREG Input Voltage to Error Amplifier Continuous power dissipation Operating temperature Junction temperature Storage temperature Lead temperature Condition — — — — — TSSOP16（Ta=+25℃） — — — — Rated Value Min. Max. +6 -50 -30 -40 50 10 6.5 500 +85 +125 +150 +300 Unit V mA mA mA 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 Min. 2.4 100 -10 Values Typ. -500 +25 Max. 5.5 1000 +85 Unit 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: service@aimtron.com.tw 3 AT1730 Preliminary Product Information 2-Channel PWM Controller for LCD Bias Electrical Characteristics (VCC = 3V,Ta =+25℃, unless otherwise noted.) Parameter Symbol Condition Values Min. Typ. Max. Unit Input Supply Range VCC Lockout Undervoltage VCC UVLO VTH1/2 VTH-Line VCC=2.5V to 5.5 Ta =-10℃ to +85℃ ICCS ICC VIO IFBH IFBL VFB = VREG -0.5V VFB = 0.5V Ta =-10℃ to +85℃ Ta =-10℃ to +85℃ fT VCOM AV fosc CT =100pF CT =100pF CT =100pF Vcc=2.5V to 5.5V Ta =-10℃ to +85℃ VREF VREF-line VREF-load IREG =no load Vcc=2.5V to 5.5V REG 2.4 - 5.5 V V V mV % μA mA mV μA mA % % MHz V dB kHz V V % % V mV mV 2.00 2.20 2.35 0.98 1.00 1.02 0.5 1.0 3 10 5 15 2.0 10 -70 3.0 20 20 Vcc0.4 580 5 7 EA Reference Voltage Entire device EA Reference Voltage line-regulation EA Rference Variation with Temperature Standby current Operating Current Input Offset Voltage Source Current Sink Current Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth Common Mode Input Voltage Range DC Open Loop Gain Frequency High Level Voltage Sawtooth wave Oscillator (OSC) Low Level Voltage Variation with Power Supply Variation with temperature Regulated Voltage Regulated Voltage for internal Control Block Line Regulator Load Regulator ON/OFF=GND VCS2= VCS2=0V IN=FB -160 -120 2.0 0 430 2.5 1.6 100 490 1.016 0.396 5 Error amplifier 2.16 2.20 2.24 -20 20 20 =0~1mA 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 AT1730 Preliminary Product Information 2-Channel PWM Controller for LCD Bias Variation with Ta =-10℃ to +85℃ Temperature Duty Cycle=0% Threshold voltage of VCS1/2 0 Soft-Start and Duty CS1/2 Section Duty Cycle=100% Threshold voltage of VCS1/2 100 CS1/2 Threshold Voltage of VCPTH CP Timer Latch Section Threshold Voltage of VFBTL (TL) FB1/2 VCP =VREG -0.5V Charge Current of CP ICP Output Section Rise time of OUT1,2 Fall time of OUT1,2 High Level on Resistance of OUT1,2 Low Level on Resistance of OUT1,2 On/OFF Section Active mode Threshold Disable mode Threshold tr1_2 tf1_2 R1_2AH R1_2AL VONH VONL 1.5 % V V V V 0.38 0.39 0.40 0.96 1.01 1.06 1.00 1.22 - 0.75 1.25 1.75 μA 25 25 14 11 35 35 17 17 0.8 ns ns Ω Ω V V CO =1000pF between 20 OUT1,2-GND CO =1000pF between 20 OUT1,2-GND IOUT1_2=-50mA 11.5 IOUT1_2=50mA 8.5 2.0 - 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 AT1730 Preliminary Product Information 2-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: service@aimtron.com.tw 6 AT1730 Preliminary Product Information 2-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: service@aimtron.com.tw 7