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MAX5945 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX5945 Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 44 page ![]() Quad Network Power Controller for Power-Over-LAN 6 _______________________________________________________________________________________ Note 2: Default values. The charge/discharge currents are programmable through the serial interface (see the Register Map and Description section). Note 3: Default values. The current-limit thresholds are programmed through the I2C-compatible serial interface (see the Register Map and Description section). Note 4: This is the default value. Threshold can be programmed through serial interface R23h[2:0]. Note 5: AC disconnect works only if VDD - VDGND ≥ 3V. Note 6: tDISC can also be programmed through the serial interface (R29h) (see the Register Map and Description section). Note 7: RD = (VOUT_2 - VOUT_1) / (IDET_2 - IDET_1). VOUT_1, VOUT_2, IDET_2 and IDET_1 represent the voltage at OUT_ and the current at DET_ during phase 1 and 2 of the detection. Note 8: Default values. The startup and fault times can also be programmed through the I2C serial interface (see the Register Map and Description section). Note 9: Guaranteed by design. Not subject to production testing. ANALOG SUPPLY CURRENT vs. INPUT VOLTAGE INPUT VOLTAGE (V) 57 52 47 42 37 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 3.5 32 62 MEASURED AT AGND ANALOG SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE ( °C) 60 35 10 -15 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 3.0 -40 85 DIGITAL SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE ( °C) 60 35 10 -15 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 -40 85 Typical Operating Characteristics (VEE = -48V, VDD = +3.3V, AUTO = AGND = DGND = 0V, RESET = SHD_ = unconnected, RSENSE = 0.5 Ω, all registers = default setting, TA = +25°C, unless otherwise noted.) ELECTRICAL CHARACTERISTICS (continued) (AGND = +32V to +60V, VEE = 0V, VDD to DGND = +3.3V, all voltages are referenced to VEE, unless otherwise noted. Typical values are at AGND = +48V, DGND = +48V, VDD = (DGND + 3.3V), TA = +25°C. Currents are positive when entering the pin and negative otherwise.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Setup Time for a Repeated START Condition (Sr) tSU, STA (Note 9) 0.6 µs Data Hold Time tHD, DAT (Note 9) 0 150 ns Data Setup Time tSU, DAT (Note 9) 100 ns Rise Time of Both SDA and SCL Signals, Receiving tR (Note 9) 20 + 0.1CB 300 ns Fall Time of SDA Transmitting tF (Note 9) 20 + 0.1CB 300 ns Setup Time for STOP Condition tSU, STO (Note 9) 0.6 µs Capacitive Load for Each Bus Line CB (Note 9) 400 pF Pulse Width of Spike Suppressed tSP (Note 9) 50 ns |
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