MAX1516/MAX1517/MAX1518 19-3244 Rev 0 4/04 TFT-LCD DC-DC Converters with Operational Amplifiers General Description Features The MAX1516/MAX1517/MAX1518 include a high-perfor- 2.6V to 5.5V Input Supply Range mance step-up regulator, two linear-regulator controllers, 1.2MHz Current-Mode Step-Up Regulator and high-current operational amplifiers for active-matrix Fast Transient Response to Pulsed Load thin-film transistor (TFT) liquid-crystal displays (LCDs). High-Accuracy Output Voltage (1.5%) Also included is a logic-controlled, high-voltage switch Built-In 14V, 2.4A, 0.16 N-Channel MOSFET with adjustable delay. High Efficiency (90%) The step-up DC-DC converter provides the regulated Linear-Regulator Controllers for V and V supply voltage for the panel source driver ICs. The con- GON GOFF verter is a high-frequency (1.2MHz) current-mode regu- High-Performance Operational Amplifiers lator with an integrated 14V n-channel MOSFET that 150mA Output Short-Circuit Current 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 Adjustable Delay using external charge pumps attached to the switching node. The MAX1518 includes five high-performance Timer-Delay Fault Latch for All Regulator Outputs operational amplifiers, the MAX1517 includes three, Thermal-Overload Protection and the MAX1516 includes one operational amplifier. These amplifiers are designed to drive the LCD back- 0.6mA Quiescent Current plane (VCOM) and/or the gamma-correction divider string. The devices feature high output current Minimal Operating Circuit (150mA), fast slew rate (13V/s), wide bandwidth V V CN CP (12MHz), and rail-to-rail inputs and outputs. The MAX1516/MAX1517/MAX1518 are available in 32- pin thin QFN packages with a maximum thickness of V V IN MAIN LX 0.8mm for ultra-thin LCD panels. IN FB STEP-UP Applications CONTROLLER PGND Notebook Computer Displays COMP VCP AGND LCD Monitor Panels MAX1518 DRVP Automotive Displays GATE-ON V GON CONTROLLER FBP Ordering Information SRC DEL PART TEMP RANGE PIN-PACKAGE COM SWITCH CONTROL CTL MAX1516ETJ -40C to +100C 32 Thin QFN 5mm x 5mm VCN DRN MAX1517ETJ -40C to +100C 32 Thin QFN 5mm x 5mm DRVN GATE-OFF VGOFF CONTROLLER MAX1518ETJ -40C to +100C 32 Thin QFN 5mm x 5mm SUP NEG1 FBN OUT1 OP1 REF REF POS1 NEG2 NEG4 OUT2 OUT4 OP2 OP4 POS2 POS4 NEG5 OUT3 OUT5 OP3 OP5 POS3 POS5 BGND Pin Configurations appear at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLETFT-LCD DC-DC Converters with Operational Amplifiers ABSOLUTE MAXIMUM RATINGS IN, CTL to AGND......................................................-0.3V to +6V COM, DRN to AGND ................................-0.3V to (V + 0.3V) SRC COMP, FB, FBP, FBN, DEL, REF to AGND ....-0.3V to (V + 0.3V) DRN to COM............................................................-30V to +30V IN PGND, BGND to AGND......................................................0.3V OUT Maximum Continuous Output Current....................75mA LX to PGND ............................................................-0.3V to +14V LX Switch Maximum Continuous RMS Output Current.........1.6A SUP to AGND .........................................................-0.3V to +14V Continuous Power Dissipation (T = +70C) A DRVP, SRC to AGND..............................................-0.3V to +30V 32-Pin Thin QFN (derate 21.2mW/C above +70C) ..1702mW POS , NEG , OUT to AGND...................-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +100C SUP POS1 to NEG1, POS2 to NEG2, POS3 to NEG3, Junction Temperature......................................................+150C POS4 to NEG4, POS5 to NEG5...............................-6V to +6V Storage Temperature Range .............................-65C to +150C DRVN to AGND ...................................(V - 30V) to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C IN IN 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 other- IN SUP REF A A wise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IN Supply Range V 2.6 5.5 V IN IN Undervoltage-Lockout V V rising, typical hysteresis = 150mV 2.3 2.5 2.7 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 611 LX switching Duration to Trigger Fault 55 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 0.96 1.00 1.04 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 75 150 280 S COMP FB Voltage Gain FB to COMP 600 V/ V 2 MAX1516/MAX1517/MAX1518