SI3452 SILABS [Silicon Laboratories], SI3452 Datasheet - Page 5

• Manufacturer Part Number: SI3452
• Description: QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE+ PSES
• Manufacturer: SILABS [Silicon Laboratories]

Table 2. Recommended Operating Conditions
Table 3. UVLO, and Reset Specifications
Description
Ambient operating tem-
perature
Thermal impedance*
Power Supply Voltages
V
V
Power Supply Currents
V
V
*Note: Modeled with six parts evenly spaced on a 30 x 120 mm2, four-layer board with 25 thermal vias to a Vneg plane on the
Description
V
V
RST input high voltage
RST input low voltage
RST input leakage
Reset time delay
Reset assertion time
V
V
*Note: If VDD ramp time is slower than 1 ms, hold the reset pins low until VDD is above 3.0 V to insure proper reset
EE
DD
EE
DD
DD
DD
EE
EE
supply voltage
supply current
monitor accuracy
UVLO threshold
supply voltage
supply current
reset threshold
power-on ramp
back.
operation.
*
T
Symbol
V
V
RSTDLY
V
T
EEMON
UVLO
RST
RST
Symbol
V
V
θ
I
I
T
DD
EE
DD
JA
EE
A
Time between end of reset and begin-
Measured V
RST low time to generate system
Point at which VEE UVLO is
ning of normal operation
Ramp from 0 V to 3.0 V
All ports on, excluding load current.
for V
For IEEE 802.3af (15.4 W) apps.
VEE going negative
VEE going positive
For IEEE 802.3at (30 W) apps.
Test Conditions
All ports in shutdown mode
EE
EE
RST = 0 V
declared.
“–GM” part numbers
“–IM” part numbers
(–44 to –57 V)
relative to actual V
reset
Test Conditions
Rev. 1.0
1 m/s airflow
No airflow
EE
0.7 x V
Min
–38
15
–4
—
—
—
—
—
—
DD
Min
–10
–40
–57
–57
3.0
—
—
—
—
—
Typ
–36
–33
2.2
—
—
—
—
—
—
—
Typ
–48
–54
3.3
3.7
32
28
—
—
1
8
Si3452/3
Max
100
–31
0.8
40
—
—
—
—
Max
1
4
–45
–51
3.6
6.0
85
85
14
—
—
2
°C/W
Unit
Unit
mA
mA
ms
ms
°C
μA
μs
%
V
V
V
V
V
V
5