Datasheet

Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
8
Maxim Integrated
MAX5988A/MAX5988B
IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2,
Powered Devices with Integrated DC-DC Converter
DETECTION CURRENT vs. INPUT VOLTAGE
MAX5988A toc01
INPUT VOLTAGE (V)
DETECTION CURRENT (mA)
8.97.45.94.42.9
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0
1.4 10.1
INPUT OFFSET CURRENT
vs. INPUT VOLTAGE
MAX5988A toc04
SUPPLY VOLTAGE (V)
OFFSET CURRENT (µA)
7.45.94.42.9
-2
-1
0
1
2
3
-3
1.4 10.18.9
INRUSH CURRENT LIMIT vs. V
CC
VOLTAGE
MAX5988A toc07
V
CC
(V)
INRUSH CURRENT (mA)
4236302418126
44
48
52
56
60
40
04
8
QUIESCENT CURRENT vs. SUPPLY
VOLTAGE (ULTRA-LOW POWER MODE)
MAX5988A toc02
SUPPLY VOLTAGE (V)
QUIESCENT CURRENT (mA)
55504540
2.75
3.00
3.25
3.50
3.75
4.00
2.50
35 60
CLASSIFICATION CURRENT
vs. INPUT VOLTAGE
MAX5988A toc05
INPUT VOLTAGE (V)
CLASSIFICATION CURRENT (mA)
222018161412
7
9
11
13
15
17
19
21
23
25
5
10 24
CLASS2
CLASS1
LED CURRENT vs. R
SL
MAX5988A toc08
R
SL
(kI)
LED CURRENT (mA)
706050403020
12
18
20
24
28
8
10 80
SIGNATURE RESISTANCE
vs. SUPPLY VOLTAGE
MAX5988A toc03
SUPPLY VOLTAGE (V)
DIFFERENTIAL RESISTANCE (kI)
7.45.94.42.9
23
24
25
26
27
28
22
1.4 10.18.9
CLASSIFICATION SETTLING TIME
MAX5988A toc06
V
DD
10V/div
GND
I
DD
10mA/div
0mA
400µs/div
LED CURRENT vs. LED VOLTAGE
MAX5988A toc09
LED VOLTAGE (V)
LED CURRENT (mA)
5.253.501.75
10
15
20
25
5
0 7.00
R
SL
= 30.2kI
R
SL
= 60.4kI