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MAX1977EEI Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1977EEI Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 32 page High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers 6 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12.0.V, ON3 = ON5 = VCC, V SHDN = 5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS LDO5 Bootstrap Switch Threshold Falling edge of OUT5, rising edge at OUT5 regulation point 4.43 4.69 V LDO5 Bootstrap Switch Resistance LDO5 to OUT5, VOUT5 = 5V 3.2 Ω LDO3 Output Voltage ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO3 < 100mA 3.27 3.43 V LDO3 Bootstrap Switch Threshold Falling edge of OUT3, rising edge at OUT3 regulation point 2.80 3.02 V LDO3 Bootstrap Switch Resistance LDO3 to OUT3, VOUT3 = 3.2V 3.5 Ω REF Output Voltage No external load 1.975 2.025 V REF Load Regulation 0 < ILOAD < 50µA 10 mV REF Sink Current REF in regulation 10 µA V+ Operating Supply Current LDO5 switched over to OUT5, 5V SMPS 50 µA V+ Standby Supply Current V+ = 6V to 24V, both SMPSs off, includes ISHDN 300 µA V+ Shutdown Supply Current V+ = 4.5V to 24V 15 µA Quiescent Power Consumption Both SMPSs on, FB3 = FB5 = SKIP = GND, VOUT3 = 3.5V, VOUT5 = 5.3V 4.5 mW FAULT DETECTION Overvoltage Trip Threshold FB3 or FB5 with respect to nominal regulation point +8 +14 % PGOOD Threshold FB3 or FB5 with respect to nominal output, falling edge, typical hysteresis = 1% -12 -7 % PGOOD Output Low Voltage ISINK = 4mA 0.3 V PGOOD Leakage Current High state, forced to 5.5V 1 µA Output Undervoltage Shutdown Threshold FB3 or FB5 with respect to nominal output voltage 65 75 % Output Undervoltage Shutdown Blanking Time From ON_ signal 10 40 ms INPUTS AND OUTPUTS Feedback Input Leakage Current VFB3 = VFB5 = 2.2V -200 +200 nA Low level 0.6 PRO Input Voltage High level 1.5 V Low level 0.8 Float level 1.7 2.3 SKIP Input Voltage High level 2.4 V Low level 0.8 TON Input Voltage High level 2.4 V |
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