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MAX5945 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX5945
Description  Quad Network Power Controller for Power-Over-LAN
PDF  44 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX5945 Datasheet(HTML) 6 Page - Maxim Integrated Products

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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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