전자부품 데이터시트 검색엔진 |
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MAX1917 데이터시트(PDF) 5 Page - Maxim Integrated Products |
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MAX1917 데이터시트(HTML) 5 Page - Maxim Integrated Products |
5 / 18 page Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies _______________________________________________________________________________________ 5 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 Reference UVLO V+ = VL = 5V 1.5 1.7 V VTTR VTTR Output Voltage Range 0 1.8 V IVTTR = -5mA to +5mA 49.5 50.5 IVTTR = -25mA to +25mA, VDDR = 1.8V 49 51 VTTR Output Accuracy IVTTR = -25mA to +25mA, VDDR = 3.6V 49.5 50.5 %VDDR OSCILLATOR FSEL = VL 2.18 2.83 FSEL not connected 1.45 1.89 FSEL = REF 1.09 1.41 On Time (Note 1) FSEL = GND 0.82 1.00 µs Minimum Off Time (Note 1) 400 ns CURRENT LIMIT LX to PGND, ILIM = VL 85 110 LX to PGND, RILIM = 100k Ω 35 60 Current-Limit Threshold (Positive Direction) LX to PGND, RILIM = 400k Ω 160 230 mV Current-Limit Threshold (Negative Direction) LX to PGND, ILIM = VL, with percentage of positive current-limit threshold -90 -130 % VL REGULATOR Output Voltage 5.5V < V+ < 14V; 1mA < IVL < 35mA 4.8 5.2 V RMS Output Current 35 mA Bypass Capacitor ESR < 100m Ω 2.2 µF FSEL LOGIC Logic Input Current 3µA Logic GND Level 0.5 V Logic REF Level FSEL = VREF 1.65 2.35 V Logic Float Level FSEL floating 3.15 3.85 V Logic VL Level FSEL = VL VL - 0.4 V EN/HSD LOGIC EN/HSD Shutdown Current IEN/HSD for VEN/HSD = 0.8V 0.5 3.0 µA Logic High VL = V+ = 4.5V to 5.5V, 100mV hysteresis 1.45 V Logic Low VL = V+ = 4.5V to 5.5V 0.8 V POWER-OK OUTPUT Upper VTT Threshold 110 114 %VDDR /2 Lower VTT Threshold 86 90 %VDDR /2 |
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