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MAX5987A Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX5987A
Description  IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, PDs with Integrated DC-DC Converter
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX5987A Datasheet(HTML) 6 Page - Maxim Integrated Products

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MAX5986A/MAX5986B/MAX5987A
IEEE 802.3af-Compliant, High-Efficiency, Class 1/
Class 2, PDs with Integrated DC-DC Converter
6
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 48V, RSIG = 24.9kω, LED, VCC, SL, ULP, WK, RESET, LDO_OUT unconnected, WAD = LDO_EN = LDO_IN = PGND = GND,
C1 = 68nF, C2 = 10µF, C3 = 1µF (see Figure 3), VFB = VAUX = 0V, LX unconnected. All voltages are referenced to GND, unless
otherwise noted. TA = TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
FB Input Bias Current
IFB
VFB = 1.224V
10
200
nA
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE
Output Voltage Range
VOUT
MAX5986A/MAX5987A
3.0
5.6
V
MAX5986B
5.4
14
Cycle by Cycle Overvoltage
Protection
VOUT-OV
Rising (Note 7)
100.5
100.3
108
%
Falling (Note 7)
98.5
INTERNAL COMPENSATION NETWORK
Compensation Network Zero-
Resistance
RZERO
200
kI
Compensation Network Zero-
Capacitance
CZERO
150
pF
CURRENT LIMIT
Peak Current-Limit Threshold
IPEAK-LIMIT
MAX5986A
1.45
64
A
MAX5986B
CLASS2 = GND
0.75
0.81
CLASS2 = VDRV
0.85
0.94
MAX5987A
CLASS2 = GND
1.45
1.64
CLASS2 = VDRV
1.66
1.79
Runaway Current-Limit Threshold
IRUNAWAY-
LIMIT
MAX5986A
1.9
A
MAX5986B
CLASS2 = GND
0.93
CLASS2 = VDRV
1.07
MAX5987A
CLASS2 = GND
1.9
CLASS2 = VDRV
2.2
Valley Current-Limit Threshold
IVALLEY-
LIMIT
MAX5986A/MAX5987A
1.5
A
MAX5986B
0.75
ZX Threshold
IZX
25
mA
TIMINGS
Switching Frequency
fSW
MAX5986A
245
275
305
kHz
MAX5986B/MAX5987A
190
215
238
Frequency Foldback
fSW-FOLD
MAX5986A
122.5
137.5
152.5
kHz
MAX5986B/MAX5987A
95
107.5
119
Consecutive ZX Events for
Entering Foldback
8
Events
Consecutive ZX Events for Exiting
Foldback
8
Events


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