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MAX1880EUG Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1880EUG Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 38 page Quad-Output TFT LCD DC-DC Converters with Buffer 10 ______________________________________________________________________________________ Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = +3.3V, SHDN = IN, VMAIN = VSUPP = VSUPN = VSUPB = VSUPL = 8V, BUF- = BUFOUT, BUF+ = FLTSET = TGND = PGND = GND, TA = +25°C.) 30 50 40 70 60 90 80 100 NEGATIVE CHARGE-PUMP EFFICIENCY vs. LOAD CURRENT INEG (mA) 0 10203040 VSUPN = 7V VSUPN = 8V VSUPN = 6V VNEG = -5V -14 -10 -12 -6 -8 -4 -2 26 8 4 101214 MAXIMUM NEGATIVE CHARGE-PUMP OUTPUT VOLTAGE vs. SUPPLY VOLTAGE VSUPN (V) INEG = 10mA INEG = 1mA 1.23 1.24 1.25 1.26 1.27 0 20406080 100 REFERENCE VOLTAGE vs. REFERENCE LOAD CURRENT IREF ( µA) STEP-UP CONVERTER LOAD-TRANSIENT RESPONSE MAX1778 toc13 200mA 0 8.1V 8.0V 7.9V 1A 0 40 µs/div A. IMAIN = 20mA to 200mA, 200mA/div B. VMAIN = 8V, 100mV/div C. INDUCTOR CURRENT, 1A/div CINTG = 1000pF C B A STEP-UP CONVERTER LOAD-TRANSIENT RESPONSE WITHOUT INTEGRATOR MAX1778 toc14 200mA 0 8.1V 8.0V 7.9V 1A 0 40 µs/div A. IMAIN = 20mA to 200mA, 200mA/div B. VMAIN = 8V, 100mV/div C. INDUCTOR CURRENT, 1A/div INTG = REF C B A STEP-UP CONVERTER LOAD-TRANSIENT RESPONSE (1 µs PULSES) MAX1778 toc15 0.5A 0 8.0V 7.9V 1A 0.5A 0 4 µs/div A. IMAIN = 0 to 500mA, 500mA/div B. VMAIN = 8V, 100mV/div C. INDUCTOR CURRENT, 500mA/div C B A |
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