AT1730 Preliminary Product Information 2-Channel PWM Controller for LCD Bias Features General Description • 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.) 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: [email protected] 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. /SHDN 1 ON/OFF Function OUT1 9 IN2+ 2 10 IN2- 3 11 Power Supply FB2 SEL 4 5 12 13 Regulated voltage output CH1 error amplifier output GND 6 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 IN1- CH1 output for NchMOSFET Soft-star for CH1 Descript 14 CS2 7 Soft-Start for CH2 SCP 15 OUT2 8 CH2 Output for Nch or Pch MOSFET OSC 16 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: [email protected] 2 AT1730 Preliminary Product Information 2-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 Output current of VREG Input Voltage to Error Amplifier Continuous power dissipation Operating temperature Junction temperature Storage temperature Lead temperature — — Rated Value Min. Max. +6 -50 Unit V mA — - 50 mA — — TSSOP16（Ta=+25℃） — — — — -30 -40 - 10 6.5 500 +85 +125 +150 +300 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 Values Min. 2.4 100 -10 Typ. -500 +25 Unit Max. 5.5 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 AT1730 Preliminary Product Information 2-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 VCC Lockout Undervoltage EA Reference Voltage Entire device Error amplifier EA Reference Voltage line-regulation EA Rference Variation with Temperature 5.5 V UVLO 2.00 2.20 2.35 V VTH1/2 0.98 1.00 1.02 V VTH-Line 2.4 VCC=2.5V to 5.5 Ta =-10℃ to +85℃ Standby current ICCS Operating Current ICC Input Offset Voltage VIO Source Current IFBH Sink Current IFBL ON/OFF=GND VCS2= VCS2=0V IN=FB - - - 10 mV - 0.5 5 % - - 15 μA - 1.0 2.0 mA - 3 10 mV VFB = VREG -0.5V -160 -120 -70 μA VFB = 0.5V 2.0 2.5 3.0 mA Ta =-10℃ to +85℃ - - 20 % Ta =-10℃ to +85℃ - - 20 % fT - 1.6 - MHz VCOM 0 - Vcc0.4 V DC Open Loop Gain AV - 100 - dB Frequency fosc CT =100pF 430 490 580 High Level Voltage CT =100pF - 1.016 - Low Level Voltage CT =100pF - 0.396 - Vcc=2.5V to 5.5V - - 5 Ta =-10℃ to +85℃ - 5 7 Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth Common Mode Input Voltage Range Sawtooth wave Oscillator (OSC) VCC Variation with Power Supply Variation with temperature Regulated Voltage Regulated Voltage for internal Control Block Line Regulator Load Regulator VREF VREF-line VREF-load IREG =no load Vcc=2.5V to 5.5V REG =0~1mA 2.16 2.20 2.24 kHz V V % % V - - 20 mV -20 - 20 mV 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 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 tr1_2 Fall time of OUT1,2 tf1_2 High Level on Resistance of OUT1,2 Low Level on Resistance of OUT1,2 On/OFF Section R1_2AH R1_2AL - 1.5 % 0.38 0.39 0.40 V 0.96 1.01 1.06 V - 1.00 - V - 1.22 - V 0.75 1.25 1.75 μA CO =1000pF between 20 OUT1,2-GND CO =1000pF between 20 OUT1,2-GND IOUT1_2=-50mA 11.5 IOUT1_2=50mA - 25 35 ns 25 35 ns 14 17 Ω 8.5 11 17 Ω Active mode Threshold VONH 2.0 - - V Disable mode Threshold VONL - - 0.8 V 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 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: [email protected] 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: [email protected] 7