EVALUATION KIT AVAILABLE MAX1518B TFT-LCD DC-DC Converter with Operational Amplifiers General Description Features The MAX1518B includes a high-performance step-up 2.6V to 6.5V Input Supply Range regulator, two linear-regulator controllers, and high-current 1.2MHz Current-Mode Step-Up Regulator operational amplifiers for active-matrix, thin-film transistor Fast Transient Response to Pulsed Load (TFT), liquid-crystal displays (LCDs). Also included is a High-Accuracy Output Voltage (1.5%) logic-controlled, high-voltage switch with adjustable delay. Built-In 14V, 2.4A, 0.16 n-Channel MOSFET High Efficiency (90%) The step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The Linear-Regulator Controllers for V and V GON GOFF converter is a high-frequency (1.2MHz) current-mode High-Performance Operational Amplifiers regulator with an integrated 14V n-channel MOSFET 150mA Output Short-Circuit Current that allows the use of ultra-small inductors and ceramic 13V/s Slew Rate capacitors. It provides fast transient response to pulsed 12MHz, -3dB Bandwidth loads while achieving efficiencies over 85%. Rail-to-Rail Inputs/Outputs The gate-on and gate-off linear-regulator controllers Logic-Controlled, High-Voltage Switch with provide regulated TFT gate-on and gate-off supplies using Adjustable Delay external charge pumps attached to the switching node. The Timer-Delay Fault Latch for All Regulator Outputs MAX1518B includes five high-performance operational Thermal-Overload Protection amplifiers. These amplifiers are designed to drive the LCD backplane (VCOM) and/or the gamma-correction divider 0.6mA Quiescent Current string. The device features high output current (150mA), Minimal Operating Circuit fast slew rate (13V/s), wide bandwidth (12MHz), and rail-to-rail inputs and outputs. V V CN CP The MAX1518B is available in a 32-pin thin QFN package V V IN MAIN with a maximum thickness of 0.8mm for ultra-thin LCD LX panels. IN FB STEP-UP CONTROLLER PGND Applications COMP VCP AGND Notebook Computer Displays MAX1518B DRVP LCD Monitor Panels GATE-ON V GON CONTROLLER FBP SRC Ordering Information DEL COM SWITCH CONTROL CTL V PART TEMP RANGE PIN-PACKAGE CN DRN DRVN GATE-OFF 32 Thin QFN CONTROLLER VGOFF MAX1518BETJ -40C to +100C SUP (5mm x 5mm) NEG1 FBN OUT1 OP1 REF REF POS1 NEG2 NEG4 Pin Configuration appears at end of data sheet. OUT2 OUT4 OP2 OP4 POS2 POS4 NEG5 OUT3 OUT5 OP3 OP5 POS3 POS5 BGND 19-3244 Rev 1 11/14MAX1518B TFT-LCD DC-DC Converter with Operational Amplifiers Absolute Maximum Ratings IN, CTL to AGND......................................................-0.3V to +7V DRN to COM............................................................-30V to +30V COMP, FB, FBP, FBN, DEL, REF to AGND....-0.3V to (V + 0.3V) OUT Maximum Continuous Output Current....................75mA IN PGND, BGND to AGND......................................................0.3V LX Switch Maximum Continuous RMS Output Current.........1.6A LX to PGND............................................................-0.3V to +14V Continuous Power Dissipation (T = +70C) A SUP to AGND.........................................................-0.3V to +14V 32-Pin Thin QFN (derate 21.2mW/C above+70C)...1702mW DRVP, SRC to AGND..............................................-0.3V to +30V Operating Temperature Range ..........................-40C to +100C POS , NEG , OUT to AGND.................-0.3V to (V + 0.3V) Junction Temperature.......................................................+150C SUP DRVN to AGND...................................(V - 30V) to (V + 0.3V) Storage Temperature Range..............................-65C to +150C IN IN DRN to AGND..........................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s)...................................+300C SRC 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. Electrical Characteristics (V = 3V, V = 8V, PGND = AGND = BGND = 0, I = 25A, T = 0C to +85C. Typical values are at T = +25C, unless IN SUP REF A A otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IN Supply Range V 2.6 6.5 V IN IN Undervoltage-Lockout V V rising, typical hysteresis = 200mV 2.25 2.5 2.70 V UVLO IN Threshold V = V = 1.4V, V = 0, FB FBP FBN 0.6 0.8 LX not switching IN Quiescent Current I mA IN V = 1.1V, V = 1.4V, V = 0, FB FBP FBN 6 11 LX switching Duration to Trigger Fault 200 ms Condition REF Output Voltage -2A < I < 50A, V = 2.6V to 5.5V 1.231 1.250 1.269 V REF IN Temperature rising +160 Thermal Shutdown C Hysteresis 15 MAIN STEP-UP REGULATOR Output Voltage Range V V 13 V MAIN IN Operating Frequency f 1020 1200 1380 kHz OSC Oscillator Maximum Duty Cycle 84 87 90 % T = +25C to +85C 1.221 1.233 1.245 A FB Regulation Voltage V No load V FB T = 0C to +85C 1.218 1.233 1.247 A FB Fault Trip Level V falling 1.12 1.16 1.19 V FB FB Load Regulation 0 < I < full load, transient only -1.6 % MAIN FB Line Regulation V = 2.6V to 5.5V +0.04 0.15 %/ V IN FB Input Bias Current V = 1.4V -40 +40 nA FB FB Transconductance I = 5A 75 160 280 S COMP FB Voltage Gain FB to COMP 600 V/ V Maxim Integrated 2 www.maximintegrated.com