Absolute maximum ratings, Electrical characteristics – Rainbow Electronics MAX5945 User Manual
Page 2
MAX5945
Quad Network Power Controller
for Power-Over-LAN
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltages referenced to V
EE
, unless otherwise noted.)
AGND, DGND, DET_, V
DD
, RESET, A3, A2, A1, A0, SHD_,
OSC_IN, SCL, SDAIN, OUT_ and AUTO............-0.3V to +80V
GATE_ (internally clamped, Note 1)....................-0.3V to +11.4V
SENSE_ ..................................................................-0.3V to +24V
V
DD
, RESET, A3, A2, A1, A0, SHD_, OSC_IN, SCL, SDAIN and
AUTO to DGND ....................................................-0.3V to +7V
INT and SDAOUT to DGND....................................-0.3V to +12V
Maximum Current into INT, SDAOUT, DET_ .......................80mA
Maximum Power Dissipation
36-Pin SSOP (derate 11.4mW/°C above +70°C) .........941mW
Operating Temperature Ranges:
MAX5945EAX ..................................................-40°C to +85°C
MAX5945CAX .....................................................0°C to +70°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(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
POWER SUPPLIES
V
AGND
V
AGND
- V
EE
32
60
V
DGND
0
60
V
DD
to V
DGND
,
V
DGND
= V
AGND
1.71
5.50
Operating Voltage Range
V
DD
V
DD
to V
DGND
,
V
DGND
= V
EE
3.0
5.5
V
I
EE
OUT_ = V
EE
, SENSE_ = V
EE
, DET_ = AGND,
all logic inputs open, SCL = SDAIN = V
DD
,
INT and SDAOUT open; measured at AGND
in power mode after GATE_ pullup
4.2
6.8
Supply Currents
I
DIG
All logic inputs high, measured at V
DD
2.7
5.6
mA
GATE DRIVER AND CLAMPING
GATE_ Pullup Current
I
PU
Power mode, gate drive on, V
GATE
= V
EE
(Note
2)
-40
-50
-60
µA
Weak GATE_ Pulldown Current
I
PDW
SHD_ = DGND, V
GATE_
= V
EE
+ 5V
30
40
50
µA
Maximum Pulldown Current
I
PDS
V
SENSE
= 1V, V
GATE_
= V
EE
+ 2V
100
mA
External Gate Drive
V
GS
V
GATE
- V
EE
, power mode, gate drive on
9
10
11
V
CURRENT LIMIT
Current-Limit Clamp Voltage
V
SU_LIM
Maximum V
SENSE_
allowed during current limit,
V
OUT_
= V
EE
(Note 3)
202
212
220
mV
Default, class 0,
class 3, class 4
178.5
196
Class 1
49
61
Overcurrent Threshold After
Startup
V
FLT_LIM
Overcurrent V
SENSE_
threshold
allowed for
t
≤ t
FAULT
after startup;
V
OUT_
= V
EE
Class 2
90
104
mV
Foldback Initial OUT_ Voltage
V
FLBK_ST
V
OUT_
- V
EE
, above which the current-limit trip
voltage starts folding back
30
V
Foldback Final OUT_ Voltage
V
FLBK_END
V
OUT_
- V
EE
, above which the current-limit trip
voltage reaches V
TH_FB
50
V
Note 1: GATE_ is internally clamped to 11.4V above V
EE
. Driving GATE_ higher than 11.4V above V
EE
may damage the device.