Rainbow Electronics MAX5969B - Manual (Page 3)

IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
MAX5969A/MAX5969B
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ELECTRICAL CHARACTERISTICS (continued)
(V IN = (V DD - V SS ) = 48V, R DET = 24.9kω, R CLS = 615ω. RTN, WAD, PG, and 2EC unconnected, all voltages are referenced to V SS,
unless otherwise noted. T
A
= T
J
= -40 N C to +85 N C, unless otherwise noted. Typical values are at T
A
= +25 N C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V IN Turn-On Voltage V ON V IN rising
MAX5969A 34.3 35.4 36.6
V
MAX5969B 37.2 38.6 40
V IN Turn-Off Voltage V OFF V IN falling 30 V
V IN Turn-On/-Off Hysteresis
(Note 7)
V
HYST_UVLO
MAX5969A 4.2
V
MAX5969B 7.3
V IN Deglitch Time t OFF_DLY V IN falling from 40V to 20V (Note 8) 30 120 F s
Inrush to Operating Mode
Delay
t DELAY
t DELAY = minimum PG current pulse width
after entering into power mode
80 96 112 ms
Isolation Power MOSFET
On-Resistance
R ON_ISO I RTN = 600mA
T J = +25NC 0.5 0.7
I T J = +85NC 0.65 1
T J = +125NC 0.8
RTN Leakage Current I RTN_LKG V RTN = 12.5V to 30V 10
F
A
CURRENT LIMIT
Inrush Current Limit I INRUSH
During initial turn-on period,
V
RTN = 1.5V
90 135 180 mA
Current Limit During Normal
Operation
I LIM
After inrush completed,
V
RTN = 1V
720 800 880 mA
Foldback Threshold V RTN (Note 9) 13 16.5 V
LOGIC
WAD Detection Threshold V WAD-REF
V WAD rising, V IN = 14V to 48V (referenced
to RTN)
8 9 10
V
WAD Detection Threshold
Hysteresis V WAD falling, V RTN = 0V, V SS
unconnected
0.725
WAD Input Current I
WAD-LKG
V
WAD
= 10V (referenced to RTN) 3.5
F A
2EC Sink Current
V 2EC = 3.5V (referenced to RTN), V SS
unconnected
1 1.5 2.25 mA
2EC Off-Leakage Current V 2EC = 48V 1 F A
PG Sink Current
V RTN = 1.5V, V PG = 0.8V, during inrush
period
125 230 375
F
A
PG Off-Leakage Current V PG = 48V 1 F A
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
T SD T J rising +140 N C
Thermal-Shutdown Hysteresis T J falling 28 N C