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MAX5942BCSE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
_______________________________________________________________________________________ 7
INRUSH CURRENT CONTROL
(V
IN
= 48V)
MAX5942A/B toc10
V
GATE
5V/div
I
INRUSH
100mA/div
V
OUT
50V/div
P
GOOD
50V/div
2ms/div
INRUSH CURRENT CONTROL
(V
IN
= 67V)
MAX5942A/B toc11
V
GATE
5V/div
I
INRUSH
100mA/div
V
OUT
50V/div
P
GOOD
50V/div
2ms/div
0.999
1.000
1.001
1.002
1.003
-40 0-20 20 40 60 80
V
SS_SHDN
vs. TEMPERATURE
(AT THE END OF SOFT-START)
MAX5942 toc12
TEMPERATURE (
°
C)
V
FB
= V-
V
SS_SHDN
(V) (NORMALIZED TO V
REF
= 2.4V)
80.4
80.6
80.5
80.8
80.7
80.9
81.0
-40 20 40-20 0 60 80
MAX5942A
MAXIMUM DUTY CYCLE vs. TEMPERATURE
MAX5942 toc14
TEMPERATURE (
°
C)
MAXIMUM DUTY CYCLE (%)
FB = V-
46.8
47.2
47.0
47.6
47.4
47.8
48.0
-40 20 40-20 0 60 80
MAX5942B
MAXIMUM DUTY CYCLE vs. TEMPERATURE
MAX5942 toc15
TEMPERATURE (
°
C)
MAXIMUM DUTY CYCLE (%)
FB = V-
V+ SUPPLY CURRENT
vs. TEMPERATURE
MAX5942 toc16
1.55
1.56
1.58
1.57
1.62
1.63
1.61
1.60
1.59
1.64
V+ SUPPLY CURRENT (mA)
-40 0 20-20
40
60 80
TEMPERATURE (°C)
FB = V
DD
= V-
4.40
4.43
4.42
4.41
4.45
4.44
4.49
4.48
4.47
4.46
4.50
-40 -20 0 20 40 60 80
SOFT-START SOURCE CURRENT
vs. TEMPERATURE
MAX5942 toc17
TEMPERATURE (°C)
SOFT-START SOURCE CURRENT (µA)
V
DD
= FB = SS_SHDN = V-
V+ = 67V
13.50
13.55
13.70
13.65
13.60
13.75
13.80
-40 0-20 20 40 60 80
V+ INPUT CURRENT vs.
TEMPERATURE (AFTER STARTUP)
MAX5942 toc18
TEMPERATURE (°C)
V+ INPUT CURRENT (µA)
V+ = 67V, V
DD
= 13V, FB = V-
Typical Operating Characteristics (continued)
(V
IN
= (GND - V
EE
) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = V
EE
, V
DD
= 13V, NDRV floating, T
A
= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C. All voltages are referenced to V
EE
(for graphs 1–11 in the Typical Operating Characteristics); all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.
273
274
276
275
277
278
-40 0-20 20 40 60 80
NDRV FREQUENCY
vs. TEMPERATURE
MAX5942 toc13
TEMPERATURE (
°
C)
NDRV FREQUENCY (kHz)
FB = V-
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
8 _______________________________________________________________________________________
0.483
0.484
0.486
0.485
0.487
0.488
-40 0-20 20 40 60 80
CS THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX5942 toc20
TEMPERATURE (
°
C)
CS THRESHOLD VOLTAGE (V)
FB = V-
NDRV RESISTANCE
vs. TEMPERATURE
MAX5942 toc21
1.0
1.5
2.5
2.0
4.0
4.5
3.5
3.0
5.0
NDRV RESISTANCE (Ω)
-40 0 20-20
40
60 80
TEMPERATURE (
°
C)
HIGH-SIDE DRIVER
LOW-SIDE DRIVER
-40 -20 0 20 40 60 80
CURRENT-LIMIT DELAY
vs. TEMPERATURE
MAX5942 toc22
TEMPERATURE (
°
C)
CURRENT-LIMIT DELAY (ns)
188
190
192
194
196
198
200
202
204
206
208
210
FB = V-, 100mV OVERDRIVE ON CS
2.400
2.402
2.406
2.404
2.408
2.410
010155 2025303540
V
SS_SHDN
vs. V
DD
MAX5942 toc23
V
DD
(V)
V
SS_SHDN
(V)
267.0
268.0
267.5
269.0
268.5
269.5
270.0
270.5
271.0
010155 2025303540
NDRV FREQUENCY vs. V
DD
MAX5942 toc24
V
DD
(V)
NDRV FREQUENCY (kHz)
FB = V-
Typical Operating Characteristics (continued)
(V
IN
= (GND - V
EE
) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = V
EE
, V
DD
= 13V, NDRV floating, T
A
= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C. All voltages are referenced to V
EE
(for graphs 1–11 in the Typical Operating Characteristics); all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.
179.0
180.0
179.5
180.5
182.0
181.5
181.0
182.5
-40 -20 0 20 40 60 80
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5942 toc19
TEMPERATURE (
°
C)
V+ SHUTDOWN CURRENT (µA)
V+ = 67V, FB = SS_SHDN = V-
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
_______________________________________________________________________________________ 9
0
2
14
6
4
8
10
12
16
0403010 20 50 60 70 80 90 110
V+ SUPPLY CURRENT vs. V+ VOLTAGE
(AFTER STARTUP)
MAX5942 toc28
V+ VOLTAGE (V)
V+ LEAKAGE CURRENT (µA)
100
V
DD
= 13V, FB = V-
1.51
1.53
1.52
1.56
1.55
1.54
1.59
1.58
1.57
1.60
04020 60 80 100
V+ SUPPLY CURRENT vs.
V+ VOLTAGE
MAX5942 toc27
V+ VOLTAGE (V)
V+ SUPPLY CURRENT (mA)
V
FB
= V
DD
= V-
9.0
9.4
9.2
9.8
9.6
10.2
10.0
10.4
V
CC
VOLTAGE vs. V
CC
CURRENT
MAX5942 toc29
V
CC
CURRENT (mA)
V
CC
VOLTAGE (V)
0 5 10 15 20
V+ = +67V, V
FB
= 4V
V
DD
= 36V
V
DD
= 13V
9.0
9.3
9.2
9.1
9.4
9.5
9.6
9.7
9.8
9.9
10.0
0 5 10 15 20
V
CC
VOLTAGE vs. V
CC
CURRENT
MAX5942 toc30
V
CC
CURRENT (mA)
V
CC
VOLTAGE (V)
V
DD
= GND, V
FB
= 4V
V+ = 67V
V+ = 48V
V+ = 36V
V+ = 24V
Typical Operating Characteristics (continued)
(V
IN
= (GND - V
EE
) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = V
EE
, V
DD
= 13V, NDRV floating, T
A
= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C. All voltages are referenced to V
EE
(for graphs 1–11 in the Typical Operating Characteristics); all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.
47.0
47.2
47.1
47.4
47.3
47.6
47.5
47.7
47.9
47.8
48.0
010155 2025303540
MAX5942B
MAXIMUM DUTY CYCLE vs. V
DD
MAX5942 toc25
V
DD
(V)
MAXIMUM DUTY CYCLE (%)
V
FB
= 4V, CS = V-
DEVICE POWERED
FROM V+
DEVICE POWERED
FROM V
DD
9.5
9.6
9.8
9.7
10.0
10.1
9.9
10.2
010155 2025303540
V
CC
vs. V
DD
MAX5942 toc26
V
DD
(V)
V
CC
(V)
DEVICE POWERED FROM V
DD
DEVICE POWERED
FROM V+
FB = V-
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX5942BCSE+T

Mfr. #:
Buy MAX5942BCSE+T
Manufacturer:
Maxim Integrated
Description:
I/O Controller Interface IC IEEE 802.3af POE Int/PWM Controller
Lifecycle:
New from this manufacturer.
Delivery:
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