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MAX1542 Dataheets PDF



Part Number MAX1542
Manufacturers Maxim
Logo Maxim
Description TFT LCD DC-to-DC Converter with Operational Amplifiers
Datasheet MAX1542 DatasheetMAX1542 Datasheet (PDF)

19-2741; Rev 0; 4/03 KIT ATION EVALU LE B A IL A AV TFT LCD DC-to-DC Converter with Operational Amplifiers General Description Features o Ultra-High-Performance Step-Up Regulator Fast Transient Response to Pulsed Load Using Current-Mode Control Architecture High-Accuracy Output Voltage (1.3%) Built-In 14V, 1.2A, 0.2Ω N-Channel Power MOSFET with Lossless Current-Sensing High Efficiency (85%) 8-Step Current-Controlled Digital Soft-Start o Two High-Performance Operational Amplifiers 150mA Output .

  MAX1542   MAX1542


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19-2741; Rev 0; 4/03 KIT ATION EVALU LE B A IL A AV TFT LCD DC-to-DC Converter with Operational Amplifiers General Description Features o Ultra-High-Performance Step-Up Regulator Fast Transient Response to Pulsed Load Using Current-Mode Control Architecture High-Accuracy Output Voltage (1.3%) Built-In 14V, 1.2A, 0.2Ω N-Channel Power MOSFET with Lossless Current-Sensing High Efficiency (85%) 8-Step Current-Controlled Digital Soft-Start o Two High-Performance Operational Amplifiers 150mA Output Short-Circuit Current 7.5V/µs Slew Rate 12MHz -3dB Bandwidth Rail-to-Rail Inputs/Outputs Unity Gain Stable o Logic-Controlled High-Voltage Switch with Adjustable Delay o Timer Delay Latch FB Fault Protection o Thermal Protection o 2.6V to 5.5V Input Operating Voltage Range o 3.6mA (Switching), 0.45mA (Not Switching) Quiescent Current o Ultra-Thin 20-Pin Thin QFN Package (5mm x 5mm x 0.8mm) MAX1542/MAX1543 The MAX1542/MAX1543 include a high-performance boost regulator and two high-current operational amplifiers for active matrix, thin-film transistor (TFT), liquidcrystal displays (LCDs). Also included is a logiccontrolled, high-voltage switch with adjustable delay. The MAX1543 includes an additional high-voltage load switch and features pin-selectable boost regulator switching frequency. The step-up DC-to-DC converter is a high-frequency 640kHz (MAX1543)/1.2MHz (MAX1542/MAX1543) current-mode regulator with a built-in power MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loads while producing efficiencies over 85%. The two easy-to-use, high-performance operational amplifiers can drive the LCD backplane (VCOM) and/or the gamma correction divider string. The devices feature high short-circuit current (150mA), fast slew rate (7.5V/µs), wide bandwidth (12MHz), and Rail-to-Rail® inputs and outputs. The MAX1542/MAX1543 are available in 20-pin thin QFN packages with a maximum thickness of 0.8mm for ultra-thin LCD panel design. Applications Notebook Computer Displays LCD Monitor Panels PDAs Car Navigation Displays Pin Configurations DRN CTL DEL FB Ordering Information PART MAX1542ETP MAX1543ETP TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 Thin QFN (5mm x 5mm) 20 Thin QFN (5mm x 5mm) TOP VIEW 20 19 18 17 COMP COM SRC I.C. PGND AGND 1 2 3 4 5 NEG2 10 16 15 14 FREQ IN LX SUP POS2 MAX1543 13 12 11 6 7 8 OUT1 POS1 THIN QFN (5mm x 5mm) Pin Configurations continued at end of data sheet. NEG1 OUT2 9 Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. 1 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. TFT LCD DC-to-DC Converter with Operational Amplifiers MAX1542/MAX1543 ABSOLUTE MAXIMUM RATINGS IN, CTL, COMP, FB, DEL, FREQ (MAX1543) to AGND ...............................................................-0.3V to +6V COMP, FB, DEL to AGND .............................-0.3V to (IN + 0.3V) PGND to AGND ..................................................................±0.3V LX to PGND ............................................................-0.3V to +14V SUP, POS1, NEG1, OUT1, POS2, NEG2, OUT2 to AGND .......................................-0.3V to +14V POS1, NEG1, OUT1, POS2, NEG2, OUT2 to AGND ......................................-0.3V to (SUP + 0.3V) SRC, COM to AGND...............................................-0.3V to +30V SRC to COM ...........................................................-0.3V to +30V SRC to DRN (MAX1543).........................................-0.3V to +30V COM to AGND ...........................................-0.3V to (SRC + 0.3V) DRN (MAX1543) to AGND .........................-0.3V to (SRC + 0.3V) DRN (MAX1543) to COM.........................................-30V to +30V MAX1542 COM RMS Output Current ...............................+75mA MAX1543 COM RMS Output Current ...............................±50mA OUT1, OUT2 Continuous Output Current.........................±75mA Continuous Power Dissipation (TA = +70°C) 20-Pin Thin QFN 5mm x 5mm (derate 20.8mW/°C above +70°C) .............................1667mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .....................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°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. ELECTRICAL.


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