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MAX1845ETX Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1845ETX Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 27 page Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit _______________________________________________________________________________________ 5 ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, VDD = VCC = 5V, SKIP = AGND, V+ = 15V, TA = -40°C to +85°C, unless otherwise noted.) (Note 5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLERS V+ Battery voltage, V+ 2 28 Input Voltage Range VCC/VDD VCC, VDD 4.5 5.5 V FB1 to AGND 1.773 1.827 FB1 to VCC 1.477 1.523 DC Output Voltage, OUT1 (Note 2) VOUT1 V+ = 2V to 28V, SKIP = VCC, ILOAD = 0 to 10A FB1 to OUT1 0.985 1.015 V FB2 to AGND 2.463 2.537 DC Output Voltage, OUT2 (Note 2) VOUT2 V+ = 2V to 28V, SKIP = VCC, ILOAD = 0 to 10A FB2 to OUT2 0.985 1.015 V Output Voltage Adjust Range OUT1, OUT2 1 5.5 V Dual-Mode Threshold (Low) OVP, FB_ 0.05 0.15 V OVP, ILIM_ VCC - 1.5 VCC - 0.4 Dual-Mode Threshold (High) FB_ 1.9 2.1 V ROUT1 VOUT1 = 1.5V 75 OUT_ Input Resistance ROUT2 VOUT2 = 2.5V 100 k Ω FB_ Input Bias Current IFB -0.1 0.1 µA TON = AGND 120 153 TON = REF 153 195 TON = float 217 272 On-Time, Side 1 (Note 3) tON1 V+ = 24V, VOUT1 = 2V TON = VCC 308 390 ns TON = AGND 160 204 TON = REF 205 263 TON = float 295 371 On-Time, Side 2 (Note 3) tON2 V+ = 24V, VOUT2 = 2V TON = VCC 422 534 ns TON = AGND 125 145 TON = REF 125 145 TON = float 125 145 On-Time Tracking (Note 3) On-time 2, with respect to on-time 1 TON = VCC 125 145 % Minimum Off-Time (Note 3) tOFF 500 ns Quiescent Supply Current (VCC)ICC FB forced above the regulation point 1500 µA Quiescent Supply Current (VDD)IDD FB forced above the regulation point 5 µA Quiescent Supply Current (V+) I+ Measured at V+ 70 µA Reference Voltage VREF VCC = 4.5V to 5.5V, no external REF load 1.98 2.02 V Reference Load Regulation IREF = 0 to 50uA 0.01 V Overvoltage Trip Threshold (Fixed-Threshold Mode) OVP = GND, with respect to FB_ regulation point, no load 112 117 % Output Undervoltage Threshold UVP = VCC, with respect to FB_ regulation point, no load 65 75 % Current-Limit Threshold (Fixed) AGND - VCS_, ILIM_ = VCC 35 65 mV |
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