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| AAT1118/A/B Details are subject to change without notice. ADJUSTABLE TRIPLE-CHANNEL TFT LCD DC-DC CONVERTER Features Built in 1.6A, 0.2 Switching NMOS Fault and Thermal Protection Internal Soft-Start Function Internal Power Up Sequencing Dual Adjustable Charge Pump Output Positive Output to 40V Negative Output to - 40V Power Good Output TSSOP-16 Package General Description The AAT1118/A/B is an adjustable triple-channel TFT LCD DC-DC converter that provides one current mode PWM, one positive charge pump and one negative charge pump. Built-in functions include soft-start and power up sequencing. When power is turned on, soft-start avoids inrush current. Power up sequencing feature provides compensation for LCD panel to maintain a smooth voltage during a turn-on cycle. The DC-DC converter consists of an on-chip voltage reference, error amplifier, current sense, pulse width modulation controller, under-voltage lockout protection, thermal detect, soft-start, and fault protection circuit. When the two charge pumps are in operation, the GND1 SW GND2 Pin Configuration (Top View) PGO IN1 EO 1 2 3 4 5 6 7 8 16 15 output voltage would be doubled and the generated VP3 and VP2 (Note 1) could switch on or off TFT gate. With the minimal external components, the AAT1118/A/B offers a simple and economical solution for TFT LCD power. VDD GND AAT1118/A/B 14 13 12 11 10 9 VDD2 / VCH3 OUT3 VREF IN3 IN2 VDD1 OUT2 SHDN Note 1: Please refer to page 13 and 14 for VP3 and VP2. (TSSOP-16 Package) - - " ~ H ] Page 1 of 18 o - - V 1.0 AAT1118/A/B Pin Description PIN NO. NAME I/O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PGO IN1 EO O I I O I I I O O O O HV Switch Output Inverting Input Pin of PWM Error Amplifier Output Pin of PWM Error Amplifier Power Supply Ground Reference Voltage Output Charge Pump Channel 3 Feedback Input Charge Pump Channel 2 Feedback Input Shutdown Control Pin; High for Enable Charge Pump Channel 2 Output High Voltage Power Supply Charge Pump Channel 3 Output High Voltage Power Supply Power Output for Channel 3 (AAT1118B Only) Ground Switch Pin SW MOS Ground DESCRIPTION VDD GND VREF IN3 IN2 SHDN OUT2 VDD1 OUT3 VDD2 VCH3 GND2 SW GND1 - - " ~ H ] Page 2 of 18 o - - V 1.0 AAT1118/A/B Absolute Maximum Ratings PARAMETER SYMBOL VALUE 7 18 16 VDD +0.3 UNIT V V V V V V VDD to GND SW to GND VDD1 , VDD2 to GND Input Voltage 1 (IN1, IN2, IN3, SHDN) Output Voltage 1 (EO, VREF ) Output Voltage 2 (OUT2, OUT3, SW, PGO) Operating Free-Air Temperature Range Storage Temperature Range Power Dissipation VDD VSW VDDH V I1 VO1 VO2 TC VDD +0.3 VDDH +0.3 - 40 to + 85 - 45 to + 125 C C mW Tstorage Pd 750 - - " ~ H ] Page 3 of 18 o - - V 1.0 AAT1118/A/B Electrical Characteristics, VDD= 3.3V, VDDH= 10V Operating Power PARAMETER Input Supply Voltage Range VDD Under Voltage Lockout SYMBOL VDD VUVLO TEST CONDITION Falling Rising MIN TYP MAX UNIT 5.5 V 2.6 2.1 2.2 2.3 V 2.3 2.4 2.5 V 6 14 0.5 3 0.1 160 0.8 6 10.0 V mA mA Regulated Output Voltage Range Quiescent Current Shutdown Current Thermal Shutdown VP1 I VDD I SHDN VIN1 =1.3V, not switching VIN1 =1.1V, switching VSHDN =GND A C Reference Voltage PARAMETER Reference Voltage Line Regulation Load Regulation SYMBOL TEST CONDITION VREF IVref = 100A IVref = 100A, VRI VDD =2.5V~5V VRO IVref = 0~100A MIN TYP MAX UNIT 1.238 1.250 1.262 V - 2 1 5 5 mV mV EA (Error Amplifier) PARAMETER Feedback Voltage Input Bias Current Feedback-Voltage Line Regulation Transconductance Voltage Gain Fault Detect Trigger Voltage SYMBOL VIN1 TEST CONDITION VEO = O VIN1=1.24V VEO = O MIN TYP MAX UNIT V 1.238 1.250 1.262 0 0.05 105 1,500 1.07 1.10 1.14 I B1 VRI 40 0.15 240 nA % /V gm AV VFI OVDD O I=5 A 70 A /V V /V V - - " ~ H ] Page 4 of 18 o - - V 1.0 AAT1118/A/B Electrical Characteristics, VDD= 3.3V, VDDH= 10V Oscillator PARAMETER SYMBOL f OSC D MAX TEST CONDITION MIN 1,100 79 TYP 1,320 85 MAX 1,600 92 UNIT kHz % Oscillation Frequency Maximum Duty Cycle N-Channel Switch PARAMETER Current Limit On-Resistance Leakage Current SYMBOL I LIM R ON I SWOFF TEST CONDITION I SW =1.2A VSW =12V MIN 1.1 TYP 1.6 0.28 0.01 MAX 2.1 0.50 20.00 UNIT A L A Control Inputs Characteristics PARAMETER Input Low Voltage Input High Voltage Hysteresis SHDN Pull Up Current SYMBOL VIL TEST CONDITION MIN TYP MAX 0.3 VDD UNIT V V VIH VHYS 0.7 VDD 0.1 VDD 0.001 1.000 V I PH A - - " ~ H ] Page 5 of 18 o - - V 1.0 AAT1118/A/B Electrical Characteristics, VDD= 3.3V, VDDH= 10V Soft Start & Fault Detect Time PARAMETER Channel 1 Soft Start Time Channel 2 Soft Start Time Channel 3 Soft Start Time Channel 1 to Channel 2 Delay Channel 2 to Channel 3 Delay During Fault Protect Trigger Time IN1 Fault Protection Voltage IN2 Fault Protection Voltage IN3 Fault Protection Voltage SYMBOL t SS1 t SS2 t SS3 TEST CONDITION MIN TYP 14 3.5 3.5 MAX UNIT ms ms ms ms ms ms t D12 t D23 t FP VF1 AAT1118A AAT1118B 1.05 0.08 1.05 7 10.5 83 1.10 0.13 1.10 1.15 0.18 1.15 V V V VF2 VF3 - - " ~ H ] Page 6 of 18 o - - V 1.0 AAT1118/A/B Electrical Characteristics, VDD= 3.3V, VDDH= 10V Charge Pump Regulator Characteristics PARAMETER VDD1 Input Supply Range VDD2 Input Supply Range IN2 Threshold Voltage IN3 Threshold Voltage IN2 Input Bias Current IN3 Input Bias Current Charge Pump Frequency OUT2 Switch R-on SYMBOL TEST CONDITION MIN 6 6 TYP MAX 15 15 UNIT V V mV V VDD1 VDD2 IN2 IN3 - 50 1.20 VIN2= - 0.05V V IN3= - 1.5V 0 1.25 50 1.30 50 50 I B2 I B3 f OSCP R ONP2 R ONN2 R ONP3 - 50 - 50 540 640 3 3 3 3 nA nA kHz L L L L 740 20 20 20 20 30 OUT3 Switch R-on Continuous Output Current R ONN3 I OUT - - " ~ H ] Page 7 of 18 o - - V 1.0 AAT1118/A/B BLOCK DIAGRAM AAT1118/A EO Error Amplifier Comparator Bandgap & Soft Start Control Logic SHDN Thermal SHDN VDD SHDN SW IN1 VREF PGO 1.24v Driver Clock GND1 Slope Compensation Current sense GND Oscillator OSC VDD2 EN3 OUT3 OSC IN1 Power Up Sequence Fault Detect EN1 EN2 VDD1 OSC OUT2 GND2 1.24v IN3 IN2 GND2 - - " ~ H ] Page 8 of 18 o - - V 1.0 AAT1118/A/B BLOCK DIAGRAM AAT1118B EO Error Amplifier Comparator Bandgap & Soft Start Control Logic SHDN Thermal SHDN VDD SHDN SW IN1 VREF PGO 1.24v Driver Clock GND1 Slope Compensation Current sense GND Oscillator OSC VDD2 EN3 OUT3 OSC IN1 Power Up Sequence Fault Detect EN1 EN2 VDD1 OSC OUT2 GND2 1.24v IN3 IN2 GND2 - - " ~ H ] Page 9 of 18 o - - V 1.0 AAT1118/A/B Typical Operating Characteristics (VIN = 3.3V, TC = +25C, unless otherwise noted.) 10.04 10.02 10 9.98 9.96 9.94 9.92 9.9 9.88 9.86 9.84 0 100 200 300 400 500 600 700 800 95 90 85 80 75 70 65 0 100 200 300 400 500 100 90 100 95 90 85 80 85 80 75 70 75 70 65 0 100 200 300 400 500 65 60 0 50 100 150 200 250 300 350 -5.8 55 -5.85 50 45 -5.9 40 -5.95 35 30 25 -6 -6.05 0 5 10 15 20 25 30 35 40 20 0 5 10 15 20 25 30 35 40 - - " ~ H ] o - - V 1.0 Page 10 of 18 AAT1118/A/B Typical Operating Characteristics (Continued) (VIN = 3.3V, TC = +25C, unless otherwise noted.) 18.05 18 17.95 17.9 17.85 80 75 70 65 60 55 17.8 17.75 17.7 0 2 4 6 8 10 12 14 16 18 20 50 45 40 0 2 4 6 8 10 12 14 16 18 20 1.2 1.15 1.1 1.05 1 0.95 0.9 0.85 2.5 3 3.5 4 4.5 5 5.5 - - " ~ H ] o - - V 1.0 Page 11 of 18 AAT1118/A/B Typical Operating Characteristics (Continued) (VIN = 3.3V, TC = +25C, unless otherwise noted.) - - " ~ H ] o - - V 1.0 Page 12 of 18 AAT1118/A/B Application Circuit AAT1118/A VP1 IN1 EO VDD SW VP1 SHDN AAT1118/A SHDN OUT2 VP1 VP2 VP2 PGO VDD1 VDD2 IN2 OUT3 VP3 VREF IN3 GND1 GND GND2 VP3 - - " ~ H ] o - - V 1.0 Page 13 of 18 AAT1118/A/B Application Circuit AAT1118B VP1 VDD SW VP1 IN1 EO SHDN AAT1118B SHDN OUT2 VP2 VP2 PGO VDD1 VCH3 VP1 IN2 OUT3 VP3 VREF IN3 GND1 GND GND2 VP3 ! ! ! ! ! ! ! - - " ~ H ] o - - V 1.0 Page 14 of 18 AAT1118/A/B Timing Chart AAT1118 V DD SHDN 90% V V 9V 0V P1 P2 -8V 25V V P3 0V 14ms Max. 3.5ms 3.5ms PGO - - " ~ H ] o - - V 1.0 Page 15 of 18 AAT1118/A/B Timing Chart AAT1118A V DD SHDN V V 9V 0V P2 P1 -8V 25V V P3 0V 14ms Max 7ms 3.5ms 3.5ms PGO - - " ~ H ] o - - V 1.0 Page 16 of 18 AAT1118/A/B Timing Chart AAT1118B ! ! !V ! DD !SHDN ! ! !VP1 ! ! !V P2 ! ! ! ! ! !V P3 90% 9V 0V -8V 25V 14ms Max 3.5ms 10.5ms 3.5ms 0V PGO - - " ~ H ] o - - V 1.0 Page 17 of 18 AAT1118/A/B Package Dimension 16-Pin TSSOP ! ! ! ! - - " ~ H ] o - - V 1.0 Page 18 of 18 |
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