MAX9550/MAX9551/MAX9552 19-3858 Rev 3 10/07 High-Current VCOM Drive Buffers for TFT LCDs General Description Features The MAX9550/MAX9551/MAX9552 provide a VCOM Operates Up To 20V source for TFT LCDs. The MAX9550/MAX9551/ 800mA Peak Output Current MAX9552 source and sink a large current to quickly restore the VCOM voltage, making it ideal for TFT LCDs. Settles to Within 0.1% of V in Less than 2s OUT The output settles to within 0.1% in less than 2s. In Excellent Load Regulation addition, the MAX9550/MAX9551/MAX9552 directly drive the capacitive load in the VCOM layer of the TFT LCDs Thermal-Shutdown Protection without the need for a series resistor. Short-Circuit Protection to Both Rails The MAX9550/MAX9551/MAX9552 feature single, dual, and quad channel VCOM amplifiers, respectively. The Soft-Start to Reduce Inrush Current MAX9550/MAX9551/MAX9552 can drive up to 800mA of peak current per channel and operate up to 20V. The devices feature soft-start to reduce inrush current, output Ordering Information short-circuit protection, and thermal shutdown. PKG TOP The MAX9550 is available in a space-saving 5-pin thin PART AMPS PIN-PACKAGE CODE MARK SOT23 package, and an 8-pin MAX package with an exposed paddle. The MAX9551 is available in an 8-pin MAX9550EZK+T 1 5 Thin SOT23-5 Z5-1 ADSG MAX package with an exposed paddle. The MAX9552 MAX9550EUA+ 1 8 MAX-EP* U8E-2 AABA is available in a 14-pin TSSOP package. All devices are MAX9551EUA+ 2 8 MAX-EP* U8E-2 specified over the -40C to +85C temperature range. MAX9552EUD+ 4 14 TSSOP-EP* U14E-3 Applications Note: All devices specified over the -40C to +85C operating temperature range. TFT-LCD Panels +Denotes lead-free package. Instrument Control Voltage Sources *EP = Exposed paddle. Pin Configuration appears at end of data sheet. Typical Operating Circuit 16V SUPPLY V DD MAX9550 TFT LCD IN+ V REF OUT TFT-LCD IN- 1F CAPACITANCE GND MAX is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEHigh-Current VCOM Drive Buffers for TFT LCDs ABSOLUTE MAXIMUM RATINGS Supply Voltage (V to GND) ................................-0.3V to +22V 8-Pin MAX (derate 10.3mW/C above +70C) ........824.7mW DD Any Other Pin to GND ................................-0.3V to (V + 0.3V) 14-Pin TSSOP (derate 20.8mW/C above +70C) .....1667mW DD IN+/IN- (current) ...............................................................20mA Operating Temperature Range ...........................-40C to +85C OUT, OUT (current)................................................................1A Junction Temperature......................................................+150C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +150C A 5-Pin Thin SOT23 (derate 2.7mW/C above +70C) ...219.1mW Lead Temperature (soldering, 10s) .................................+300C 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 = 16V, GND = 0V, V = V = V / 2, C = 1F, T = T to T , unless otherwise noted. Typical values are at DD CM OUT DD L A MIN MAX T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Inferred from PSRR test and transient Supply Voltage Range V 720V DD load test Quiescent Current I Per channel 2 4 mA CC Low Output Voltage V I = -4mA 0.04 0.1 V OL L V - 0.04 V - 0.1 High Output Voltage V I = +4mA DD DD V OH H Input Offset Voltage V -10 +1 +10 mV OS Input Bias Current I 0.01 1 A B Input Resistance R 1 M IN Common-Mode Input Voltage CMVR Inferred from CMRR 2 V - 2 V DD Common-Mode Rejection Ratio CMRR 2V V (V - 2V) 80 96 dB IN DD Power-Supply Rejection Ratio PSRR V = 3.5V, V = 7V to 16V 80 96 dB OUT DD V = 7V, V = 3.5V, guaranteed by DD OUT Continuous Output Current I 55 mA O load, regulation test I = 0mA to 50mA 6 13 OUT Output Load Regulation LR1 mV I = 0mA to -50mA 6 13 OUT I = 0mA to -55mA 6.5 15 OUT V = 7V, DD Output Load Regulation LR2 mV V = 3.5V OUT I = 0mA to 55mA 6.5 15 OUT Thermal Shutdown +160 C Thermal Hysteresis 15 C 2 MAX9550/MAX9551/MAX9552