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MAX1917 数据表(PDF) 6 Page - Maxim Integrated Products |
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MAX1917 数据表(HTML) 6 Page - Maxim Integrated Products |
6 / 18 page Note 1: On Time and Off Time specifications are measured from 50% point to 50% point at the DH pin with LX forced to 0V, BST forced to 5V, and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching speeds. Note 2: Specifications to -40°C are guaranteed by design and are not production tested. Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies 6 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (V+ = 12V, VEN/HSD = VDDR = 2.5V, CVL = 4.7µF, CVTTR = 1µF, CREF = 0.22µF, VFSEL = 0, ILIM = VL, PGND = LX = POK = GND, BST = VL. Specifications are for TA = -40°C to +85°C, unless otherwise specified.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Upper VTTR Threshold 110 114 %VDDR /2 Lower VTTR Threshold 86 90 %VDDR /2 POK Output Low Level ISINK = 2mA 0.4 V POK Output High Leakage VPOK = 5.5V 5 µA 100 50 0.1 1.0 10.0 EFFICIENCY vs. LOAD CURRENT AT 1.25V OUTPUT 60 55 LOAD CURRENT (A) 70 65 80 85 75 90 95 VIN = 5V VIN = 2V VIN = 2.5V CIRCUIT OF FIGURE 3 96 76 0.1 1.0 10.0 EFFICIENCY vs. LOAD CURRENT AT 0.9V OUTPUT 80 78 LOAD CURRENT (A) 84 82 88 90 86 92 94 VIN = 5V VIN = 2.5V CIRCUIT OF FIGURE 3 100 0 0.1 1.0 10.0 EFFICIENCY vs. LOAD CURRENT AT 1.25V OUTPUT 20 10 LOAD CURRENT (A) 40 30 60 70 50 80 90 VIN = 12V VIN = 2.5V CIRCUIT OF FIGURE 4 VIN = 5V 95 0.1 1.0 10.0 EFFICIENCY vs. LOAD CURRENT AT 0.9V OUTPUT 55 50 LOAD CURRENT (A) 65 60 75 80 70 85 90 CIRCUIT OF FIGURE 4 VIN = 5V VIN = 2.5V 300 350 450 400 550 600 500 650 -8 -4 -2 -6 02468 FREQUENCY vs. LOAD CURRENT AT 1.25V OUTPUT LOAD CURRENT (A) VIN = 12V CIRCUIT OF FIGURE 3 VIN = 5V VIN = 2.5V 300 450 400 350 600 550 500 650 -8 -2 0 -6 -4 2468 FREQUENCY vs. LOAD CURRENT AT 0.9V OUTPUT LOAD CURRENT (A) CIRCUIT OF FIGURE 3 VIN = 5V VIN = 2.5V Typical Operating Characteristics (V+ = 12V, VOUT = 1.25V, TA = +25°C, unless otherwise noted.) |
类似零件编号 - MAX1917 |
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类似说明 - MAX1917 |
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