Rainbow Electronics MAX5945 - Manual (Page 3)

MAX5945
Quad Network Power Controller
for Power-Over-LAN
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ELECTRICAL CHARACTERISTICS (continued)
(AGND = +32V to +60V, V EE = 0V, V DD to DGND = +3.3V, all voltages are referenced to V EE , unless otherwise noted. Typical
values are at AGND = +48V, DGND = +48V, V DD = (DGND + 3.3V), T A = +25°C. Currents are positive when entering the pin and
negative otherwise.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Minimum Foldback Current-
Limit Threshold
V TH_FB V OUT_ = V AGND 64 mV
SENSE_ Input Bias Current V SENSE_ = V EE -2 µA
SUPPLY MONITORS
V
EE
Undervoltage Lockout V
EEUVLO
V
AGND
- V
EE
, (V
AGND
- V
EE
) increasing 27 28.5 30 V
V EE Undervoltage-Lockout
Hysteresis
V
EEUVLOH
3 V
V EE Overvoltage V EE_OV (V AGND - V EE ) > V EE_OV , V AGND increasing 61 62.5 64 V
V EE Overvoltage Hysteresis V OVH 1 V
V EE Undervoltage V EE_UV (V AGND - V EE ) < V EE_UV , V AGND decreasing 39 40 41 V
V DD Overvoltage V DD_OV (V DD - V DGND ) > V DD_OV , V DD increasing 3.57 3.71 3.90 V
V DD Undervoltage V DD_UV (V DD - V DGND ) < V DD_UV , V DD decreasing 2.55 2.82 2.97 V
V DD Undervoltage Lockout V DDUVLO
Device operates when (V DD - V DGND ) >
V DDUVLO , V DD increasing
1.7 V
V DD Undervoltage-Lockout
Hysteresis
V DDHYS 120 mV
Thermal-Shutdown Threshold T SHD
Ports shut down and device resets if its junction
temperature exceeds this limit, temperature
increasing
+150 °C
Thermal-Shutdown Hysteresis T SHDH 20 °C
OUTPUT MONITOR
OUT_ Input Current I BOUT V OUT = V AGND , all modes 2 µA
Idle Pullup Current at OUT_ I DIS
OUT_ discharge current, detection and
classification off, port shutdown,
V
OUT_ = V AGND - 2.8V
200 260 µA
PGOOD High Threshold PG TH V OUT_ - V EE , OUT_ decreasing 1.8 2.0 2.2 V
PGOOD Hysteresis PG HYS 220 mV
PGOOD Low-to-High Glitch
Filter
t PGOOD
Minimum time PGOOD has to be high to set bit in
register 10h
2 4 ms
LOAD DISCONNECT
DC Load Disconnect
Threshold
V DCTH
Minimum V SENSE allowed before disconnect (DC
disconnect active), V OUT_ = V EE
3 4 5 mV