Rainbow Electronics MAX5953D User Manual
Page 2
MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= (V+ - V
EE
) = 48V, GATE = PGOOD =
PGOOD = unconnected, GND = OUT, HVIN = V+, UVLO = V
EE
, T
J
= 0°C to +125°C, unless
otherwise noted. Typical values are at T
J
= +25°C. All voltages are referenced to V
EE
, unless otherwise noted.) (Note 1)
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.
V+ to V
EE
................................................................-0.3V to +90V
OUT, PGOOD, PGOOD to V
EE
.....................-0.3V to (V+ + 0.3V)
RCLASS, GATE to V
EE
...........................................-0.3V to +12V
UVLO to V
EE
............................................................ -0.3V to +8V
PGOOD to OUT ........................................... -0.3V to (V+ + 0.3V)
HVIN, INBIAS, DRNH, XFRMRH,
XFRMRL to GND.................................................-0.3V to +80V
BST to GND ........................................................... -0.3V to +95V
BST to XFRMRH .................................................... -0.3V to +12V
PGND to GND .......................................................-0.3V to +0.3V
DCUVLO, RAMP, CSS, OPTO, FLTINT, RCFF,
RTCT to GND..................................................... -0.3V to +12V
SRC, CS to GND...................................................... -0.3V to +6V
REGOUT, DRVIN to GND .......................................-0.3V to +12V
REGOUT to HVIN .................................................. -80V to +0.3V
REGOUT to INBIAS ............................................... -80V to +0.3V
PPWM to GND....................................-0.3V to (V
REGOUT
+ 0.3V)
Maximum Input/Output Current (Continuous)
OUT to V
EE
....................................................................500mA
V+, RCLASS to V
EE
.........................................................70mA
UVLO, PGOOD, PGOOD to V
EE
.....................................20mA
GATE to V
EE
....................................................................80mA
REGOUT to GND ............................................................50mA
DRNH, XFRMRH, XFRMRL, SRC to GND (Average),
T
J
= +125°C..................................................................0.9A
PPWM to GND ..............................................................±20mA
Continuous Power Dissipation* (T
A
= +70°C)
48-Pin TQFN 7mm X 7mm
(derate 27.8mW/°C above +70°C) .............................2222mW
θ
JA
................................................................................36°C/W
Operating Ambient Temperature Range ................0°C to +85°C
Operating Junction Temperature Range ..............0°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWERED DEVICE (PD) INTERFACE
DETECTION MODE
Input Offset Current
I
OFFSET
V
IN
= 1.4V to 10.1V (Note 2)
10
µA
Effective Differential Input
Resistance (Note 3)
dR
V
IN
= 1.4V, up to 10.1V with 1V step
550
k
Ω
CLASSIFICATION MODE
Classification Current Turn-Off
Threshold
V
TH,CLASS
V
IN
rising (Note 4)
20.8
21.8
22.5
V
Class 0, R
RCLASS
= 10k
Ω
0
2
Class 1, R
RCLASS
= 732
Ω
9.17
11.83
Class 2, R
RCLASS
= 392
Ω
17.29
19.71
Class 3, R
RCLASS
= 255
Ω
26.45
29.55
Classification Current
I
CLASS
V
IN
= 12.6V
to 20V,
R
DISC
=
25.5k
Ω
(Notes 5, 6)
Class 4, R
RCLASS
= 178
Ω
36.6
41.4
mA
POWER MODE
Operating Supply Voltage
V
IN
V
IN
= (V+ - V
EE
)
67
V
Operating Supply Current
I
IN
Measure at V+, not including R
DISC
,
GATE = V
EE
, HVIN = GND = OUT
0.4
1
mA
MAX5953A/MAX5953C
37.4
38.6
40.2
Default Power Turn-On Voltage
V
UVLO, ON
V
IN
increasing
MAX5953B/MAX5953D
34.3
35.4
36.9
V
Default Power Turn-Off Voltage
V
UVLO,OFF
V
IN
decreasing, MAX5953A/MAX5953C
30
V
*As per JEDEC 51 standard.