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MAX1971EEE Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX1971EEE Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 21 page Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VIN = VCC = VEN = 5V, R POR = 100kΩ to IN, RPFO = 100kΩ to IN, VRSI = 0, CREF = 0.1µF, FBSEL1 = unconnected, FBSEL2 = unconnected, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN TYP MAX UNITS COMP1 AND COMP2 COMP1 Transconductance FB1 = COMP1, VCOMP1 = 1.2V FBSEL1 = unconnected 35 55 85 µS COMP2 Transconductance FB2 = COMP2, VCOMP2 = 1.2V FBSEL2 = unconnected 35 55 85 µS LX1 AND LX2 VIN = 5.0V 0.20 0.32 VIN = 3.3V 0.24 0.37 Internal High-Side MOSFET On-Resistance ILX = -180mA VIN =2.6V 0.28 Ω VIN = 5.0V 0.12 0.23 VIN = 3.3V 0.14 0.25 Internal Low-Side MOSFET On-Resistance ILX = 180mA VIN = 2.6V 0.16 Ω LX_ Current-Sense Transresistance 0.4 0.5 0.6 V/A High side 0.80 1.2 1.60 LX_ Current-Limit Threshold Duty Cycle = 100%, VIN = 2.6V to 5.5V Low side -1.6 -0.85 -0.40 A VLX1 = VLX2 = 5.5V 20 LX_ Leakage Current VIN = 5.5V VLX1 = VLX2 = 0 -20 µA MAX1970/MAX1972 1.2 1.4 1.6 LX_ Switching Frequency VIN = 2.6V to 5.5V MAX1971 0.60 0.70 0.80 MHz LX_ Maximum Duty Cycle 100 % MAX1970/MAX1972 15 20 LX_ Minimum Duty Cycle VIN = 2.6V to 5.5V MAX1971 10 15 % POR VOUT rising 92 94 POR Thresholds Percentage of VOUT, VIN = 2.6V to 5.5V VOUT falling 87 90 % MAX1970 13.3 16.6 20 POR Delay Time (TD) MAX1971/MAX1972 140 175 210 ms POR Output Current, High VPOR = VIN = 5.5V, VFB1 = VFB2 = 1.15V -1 1 µA POR Output Voltage, Low VFB1 = 1.05V or VFB2 = 1.05V or RSI = IN (MAX1971 only), I POR = 1mA 0.01 0.05 V POR Startup Voltage FB1 = FB2 = GND, IPOR = 100µA, VIN = 1.2V 0.01 0.05 V |
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