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MAX1970EEE Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1970EEE Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 / 20 page  Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step- Down Regulator with POR and RSI/PFO _______________________________________________________________________________________ 5 ELECTRICAL CHARACTERISTICS (continued) (VIN = VCC = VEN = 5V, VFB1 = VFB2 = 1.15V, R POR = 100k Ω to IN, RPFO = 100kΩ to IN, RSI = 0, CVCC = 0.1µF, CREF = 0.1µF, FBSEL1 = unconnected, FBSEL2 = unconnected, TA = -40°C to +85°C.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS FBSEL1 = GND 30 120 FB1 Input Resistance Measured from FB1 to GND FBSEL1 = VCC 30 120 k Ω FBSEL2 = GND 22.5 90 FB2 Input Resistance Measured from FB2 to GND FBSEL2 = VCC 22.5 90 k Ω FB_ Input Bias Current FB1 or FB2, FBSEL_ = unconnected, VFB1 = VFB2 = 1.15V 0.1 µA COMP1 AND COMP2 COMP1 Transconductance FB1 = COMP1, VCOMP1 = 1.2V FBSEL1 = unconnected 35 85 µS COMP2 Transconductance FB2 = COMP2, VCOMP2 = 1.2V FBSEL2 = unconnected 35 85 µS LX1 AND LX2 VIN = 5.0V 0.32 Internal High-Side MOSFET On-Resistance ILX = -180mA VIN = 3.3V 0.37 Ω VIN = 5.0V 0.23 Internal Low-Side MOSFET On-Resistance ILX = 180mA VIN = 3.3V 0.25 Ω LX_ Current-Sense Transresistance 0.4 0.6 V/A High side 0.76 1.60 LX_ Current-Limit Threshold Duty cycle = 100%, VIN = 2.6V to 5.5V Low side -1.6 -0.40 A VLX1 = VLX2 = 5.5V 20 LX_ Leakage Current VIN = 5.5V VLX1 = VLX2 = 0 -20 µA MAX1970/MAX1972 1.2 1.6 LX_ Switching Frequency VIN = 2.6V to 5.5V MAX1971 0.60 0.80 MHz MAX1970/MAX1972 20 LX_ Minimum Duty Cycle VIN = 2.6V to 5.5V MAX1971 15 % POR VOUT rising 94 POR Thresholds Percentage of VOUT, VIN = 2.6V to 5.5V VOUT falling 87 % MAX1970 13.3 20 POR Delay Time (TD) MAX1971/MAX1972 140 210 ms POR Output Current, High V POR = 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), IPOR = 1mA 0.05 V POR Start-Up Voltage FB1 = FB2 = GND, IPOR = 100µA, VIN = 1.2V 0.05 V |
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