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MAX8798 Datasheet(PDF) 2 Page - Maxim Integrated Products |
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MAX8798 Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 30 page Internal-Switch Boost Regulator with Integrated 3-Channel Scan Driver for TFT LCDs 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (VIN = VDD = VSHDN = +3V, circuit of Figure 2, BOOST = 8V, GON = 23V, GOFF = -12V, VPOS = 0V, VNEG = 1.5V, OE = CPV = STV = OECON = 0V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°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. IN, VL, SHDN to AGND .........................................-0.3V to +7.5V VDD, SDA, SCL, SCLS, WPN, WPP, SET to GND...-0.3V to +4.0V OECON, CPV, OE, STV to AGND..........................-0.3V to +4.0V COMP, FB to AGND ......................................-0.3V to (VL + 0.3V) DISH to GND ............................................................-6V to +0.3V LX to PGND ............................................................-0.3V to +20V OUT, VCOM, NEG, POS to BGND........-0.3V to (BOOST + 0.3V) PGND, BGND, AGND to GND...............................-0.3V to +0.3V GON to AGND ........................................................-0.3V to +40V GOFF to AGND .............................................-30V to (VIN + 0.3V) BOOST to BGND ....................................................-0.3V to +20V CKV, CKVB, STVP, CKVCS, CKVBCS to AGND..................(GOFF - 0.3V) to (GON + 0.3V) LX, PGND RMS Current Rating.............................................2.4A Continuous Power Dissipation (TA = +70°C) NiPd Lead Frame with Nonconductive Epoxy 36-Pin, 6mm x 6mm Thin QFN (derate 27.2mW/°C above +70°C) .........................2179.8mW 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 PARAMETER CONDITIONS MIN TYP MAX UNITS VDD Input Voltage Range 1.8 4.0 V VDD Quiescent Current VDD = 3V 4 10 μA VDD Undervoltage Lockout VDD rising; typical hysteresis 100mV 1.3 1.75 V IN Input Voltage Range (Note 1) 1.8 6.0 V IN Quiescent Current VIN = 3V, VFB = 1.5V, not switching 0.04 0.1 mA IN Undervoltage Lockout IN rising; typical hysteresis 100mV 1.4 1.75 V Thermal Shutdown Rising edge, hysteresis = 15 oC 160 oC BOOTSTRAP LINEAR REGULATOR (VL) VL Output Voltage IVL = 100μA 3.15 3.3 3.45 V VL Undervoltage Lockout VL rising, typical hysteresis 200mV 2.4 2.7 3.0 V VL Maximum Output Current VFB = 1.1V 10 mA MAIN DC-DC CONVERTER LX not switching, no load on VL 1.5 2 BOOST Supply Current LX switching, no load on VL 3 4 mA Operating Frequency 990 1170 1350 kHz Oscillator Maximum Duty Cycle 88 92 96 % FB Regulation Voltage 1.216 1.235 1.254 V FB Load Regulation 0 < ILOAD < 200mA, transient only -1 % FB Line Regulation VIN = 1.8V to 5.5V, FB to COMP -0.15 -0.08 +0.15 %/V FB Input Bias Current VFB = 1.25V 50 125 200 nA FB Transconductance I = 5μA at COMP 70 160 280 μS FB Voltage Gain FB to COMP 2400 V/V FB Fault Timer Trip Threshold Falling edge 0.96 1 1.04 V LX On-Resistance ILX = 1.2A 150 300 m LX Leakage Current VLX = 18V 0.01 20 μA LX Current Limit Duty cycle = 65% 1.6 1.9 2.2 A Current-Sense Transresistance 0.25 0.42 0.55 V/A Soft-Start Period 3 ms |
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