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MAX1844ETP Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1844ETP Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 24 page High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers _______________________________________________________________________________________ 5 PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Off-Time (Note 2) 500 ns Quiescent Supply Current (VCC) FB forced above the regulation point 800 µA Quiescent Supply Current (VDD) FB forced above the regulation point 5 µA Quiescent Supply Current (V+) Measured at V+ 40 µA Shutdown Supply Current (VCC) SHDN = GND 5 µA Shutdown Supply Current (VDD) SHDN = GND 5 µA Shutdown Supply Current (V+) SHDN = GND, V+ = 28V, VCC = VDD = 0 or 5V 5 µA Reference Voltage VCC = 4.5V to 5.5V, no external REF load 1.98 2.02 V Overvoltage Trip Threshold (Fixed-Threshold Mode) With respect to error comparator threshold, no load OVP = GND, rising edge, hysteresis = 1% 12 17 % External feedback, measured at FB with respect to VOVP, 1V < VOVP 1.8V, rising edge, hysteresis = 1% -30 +30 mV Overvoltage Comparator Offset (Adjustable-Threshold Mode) Internal feedback, measured at OUT with respect to the nominal OUT regulation voltage, 1V < VOVP < 1.8V -3.5 +3.5 % PGOOD Trip Threshold (Lower) With respect to error comparator threshold, no load OUT falling edge, hysteresis = 1% -12.5 -7.5 % PGOOD Trip Threshold (Upper) With respect to error comparator threshold, no load OUT rising edge, hysteresis = 1% 7.5 12.5 % PGOOD Output Low Voltage ISINK = 1mA 0.4 V PGOOD Leakage Current High state, forced to 5.5V 1 µA Current-Limit Threshold (Fixed) GND - VCS, ILIM = VCC 85 115 mV GND - VCS, VILIM = 0.5V 35 65 Current-Limit Threshold (Adjustable) GND - VCS, VILIM = 2V 160 240 mV VCC Undervoltage Lockout Threshold Rising edge, hysteresis = 20mV, PWM disabled below this level 4.1 4.4 V Logic Input High Voltage LATCH, SHDN, SKIP 2.4 V Logic Input Low Voltage LATCH, SHDN, SKIP 0.8 V Logic Input Current LATCH, SHDN, SKIP -1 1 µA ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, V+ = 15V, VCC = VDD = 5V, SKIP = GND, TA = -40 °C to +85°C, unless otherwise noted.) (Note 3) Note 1: When the inductor is in continuous conduction, the output voltage will have a DC regulation level higher than the error com- parator threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage will have a DC regulation level higher than the trip level by approximately 1.5% due to slope compensation. Note 2: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, VBST = 5V, and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching speeds. Note 3: Specifications to -40°C are guaranteed by design, not production tested. Note 4: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the QFN package. The MAX1844EEP, MAX1844EGP, and MAX1844ETP contain the same die and the QFN package imposes no additional resistance in-circuit. |
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