19-3302; Rev 1; 1/11
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
General Description
The MAX5913A/MAX5914A are quadruple hot-swap con-
trollers. The MAX5913A/MAX5914A independently con-
trol four external n-channel switches to hot-swap system
loads from a single V
CC
supply line. The devices allow
the safe insertion and removal of power devices from live
network ports. The operating supply voltage range is
between +35V and +72V. The devices are intended for
applications in Power-Over-Media-Dependent Interface
(MDI), but are not limited to such usage.
The MAX5913A/MAX5914A feature an internal under-
voltage lockout (UVLO) function that prevents the FET
from turning on, if V
CC
does not exceed the default
value of +32V. The devices also feature a +12V relay
driver with 100mA current drive capable of driving low-
voltage +3.3V relays. The MAX5913A features an
active-low relay driver that sinks current when the relay
output is enabled. The MAX5914A features an active-
high relay driver output that sources 1mA to drive an
external FET relay driver when the relay output is
enabled. Control circuitry ensures the relays and the
FETs are off until V
CC
reaches the UVLO threshold. The
MAX5913A/MAX5914A use an external sense resistor
to enable all the internal current-sense functions.
The MAX5913A/MAX5914A feature a programmable
analog current-limit circuit. If the switch remains in current
limit for more than a programmable time, the n-channel
FET latches off and the supply can be restarted either by
autoretry or by an external command after the preset off-
time has elapsed.
The MAX5913A/MAX5914A are available in a 44-pin
MQFP package and are specified for the extended
-40°C to +85°C operating temperature range.
Features
o
Wide Operating Input Voltage Range:
+35V to +72V
o
IEEE
®
802.3af Compatible
o
Four Independent Power Switch Controllers
o
Open-Circuit Detector
o
On-Board Charge Pumps to Drive External
n-Channel FETs
o
Current Sense with External Resistor
o
Foldback Current Limiting
o
+32V Input Undervoltage Lockout
o
On-Chip +12V, 100mA Voltage Relay Drivers
MAX5913A/MAX5914A
Ordering Information
PART
MAX5913AEMH+
MAX5913AEMH+T
MAX5914AEMH+
MAX5914AEMH+T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
44 MQFP
44 MQFP
44 MQFP
44 MQFP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration
TOP VIEW
V
DD
RTIM
ON4
RLYON4
ON3
RLYON3
ON2
RLYON2
ON1
RLYON1
DC
44
43
42
41
40
39
38
37
36
35
+
34
Applications
Power-Over-LAN
Power-Over-MDI
IP Phone Switches/Routers
Telecom Line Cards
Network Switches/Routers
Midspan Power-Over-MDI
Typical Operating Circuit appears at end of data sheet.
IEEE is a registered service mark of the Institute of Electrical and
Electronics Engineers, Inc.
FAULT
STAT1
STAT2
STAT3
STAT4
CSP4
DRAIN4
OUT4
GATE4
CSP3
DRAIN3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
33
32
31
30
29
RTRYEN
STATOUT
OCEN
DGND
V
CC
CSP1
DRAIN1
GATE1
OUT1
CSP2
DRAIN2
MAX5913A
MAX5914A
28
27
26
25
24
23
OUT3
GATE3
V
RLY
RLYD3
RLYD4
DGND
RLYD1
RLYD2
AGND
MQFP
________________________________________________________________
Maxim Integrated Products
OUT2
GATE2
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
MAX5913A/MAX5914A
ABSOLUTE MAXIMUM RATINGS
V
CC
to AGND or DGND..........................................-0.6V to +76V
DRAIN_, OUT_ to AGND or DGND .............-0.6V to (V
CC
+0.3V)
CSP_ to V
CC
..........................................................-0.3V to +0.3V
GATE_ to OUT_ .....................................................-0.3V to +13V
V
RLY
to DGND ........................................................-0.3V to +18V
RLYD_ to DGND........................................-0.3V to (V
RLY
+ 0.3V)
ON_, RLYON_, OCEN, RTRYEN, STATOUT,
DC to DGND........................................................-0.3V to +12V
FAULT
to DGND .....................................................-0.3V to +12V
STAT_, RTIM to DGND ...............................-0.3V to (V
DD
+ 0.3V)
V
DD
to DGND ...........................................................-0.3V to +7V
DGND to AGND...........................................................-5V to +5V
Current into RLYD_ .........................................-50mA to +150mA
Current into Any Other Pin................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
44-Pin MQFP (derate 12.7mW/°C above +70°C)......... 1.013W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= V
CSP
_ = +48V, V
AGND
= V
DGND
= 0V, V
DD
= +3.3V, V
RLY
= +12V, T
A
= -40°C to +85°C, unless otherwise noted. Typical val-
ues are at V
CC
= V
CSP
_ = +48V and T
A
= +25°C.)
PARAMETER
POWER SUPPLIES
Analog Supply Voltage
Analog Supply Current
Digital Supply Voltage
Digital Supply Current
Analog Supply Undervoltage
Lockout
UVLO Hysteresis
UVLO Deglitch Delay
Relay Driver Supply
Ground Potential Difference
OUT Sense Bias Current
Initial Feedback Voltage
Current-Limit Threshold Voltage
Foldback Voltage
Fast Discharge Threshold
Switch-On Threshold
Switch-On Comparator Hysteresis
MOSFET DRIVERS
Gate Overdrive Voltage
Gate Charge Current
V
GS
I
GATE
V
GATE
- V
CC
when switch is fully on
0°C to +85°C
T
A
= -40°C to 0°C
V
GATE
= 0V
7
7
7
9
9
10
11
12
13
µA
V
V
CC
I
S
V
DD
I
DD
V
UVLO
V
UVLO,H
t
D,UVLO
V
RLY
V
GG
I
FP
V
FB
_
S
V
SC
V
FLBK
V
FC
V
SWON
V
SWON
_
H
Maximum V
CC
- V
OUT
at which the switch is
defined as fully on, V
OUT
increasing
V
ON
= 3.3V, V
RLYON
= 3.3V (Figure 1)
Measured with respect to DGND
Voltage difference between DGND and AGND
V
OUT
_ = V
CC
Voltage under which the foldback circuit
starts reducing the current-limit value
(Note 1)
Maximum
∆V
across R
SENSE
at V
OUT
> V
FB
_
S
Maximum
∆V
across R
SENSE
at V
OUT
= 0V
125
42
360
1.2
18
142.5
48
420
1.5
160
160
54
480
1.8
-4
12.8
Measured with respect to AGND
V
CC
= V
CSP
_ = 72V
I
S
= I
CC
+ I
CSP
T
A
= 0°C to +85°C
T
A
= -40°C to 0°C
2.5
3.3
1.1
29
32
3
25.6
38.4
14
4
2
35
2.7
72
4
5
3.7
3
35
V
mA
V
mA
V
V
ms
V
V
µA
V
mV
mV
mV
V
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Measured with respect to DGND
All logic outputs high, RTIM unconnected
V
CC
rising, circuits enabled
FEEDBACK INPUT AND CURRENT SENSE
2
_______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CSP
_ = +48V, V
AGND
= V
DGND
= 0V, V
DD
= +3.3V, V
RLY
= +12V, T
A
= -40°C to +85°C, unless otherwise noted. Typical val-
ues are at V
CC
= V
CSP
_ = +48V and T
A
= +25°C.)
PARAMETER
Gate Discharge Current
SYMBOL
I
GATE
,
DIS
V
ON
= 0V
(V
CSP
_ - V
DRAIN
_) > V
FC
Source-Gate Clamp Voltage
OPEN-CIRCUIT DETECTOR
Open-Circuit Current-Threshold
Voltage
Delay to Open-Circuit Detect
Deglitch Delay
RELAY DRIVERS
Maximum Low Voltage (MAX5913A)
Relay Pullup Current (MAX5914A)
Clamp Diode Voltage
Relay Output Leakage
TIMING
Short-Circuit and Startup Timer
(Note 2)
t
O
R
RTIM
= 2kΩ
On time for continuous
R
RTIM
= 40kΩ
overcurrent conditions
R
RTIM
=
∞
DC = logic low
Auto-Retry Duty Cycle
Port Turn-On Delay
Relay Turn-Off Delay
DIGITAL INTERFACE
DC Pin Input-Voltage High
DC Pin Input-Voltage Low
DC Pin Input Impedance
Logic Input High
Logic Input Low
Logic Input Leakage
FAULT
Output-Voltage Low
FAULT
High Input Leakage
Logic Output-Voltage High
Logic Output-Voltage Low
V
OH
V
OL
STAT_ outputs sourcing 0.5mA
STAT_ outputs sinking 0.5mA
V
DD
- 0.4
0.4
V
FL
I
SINK
= 4mA
V
IH
_
DC
V
IL
_
DC
R
IN
_
DC
V
IH
V
IL
2.5V
≤
V
DD
≤
3.7V
2.5V
≤
V
DD
≤
3.7V
0.8 x V
DD
0.3 x V
DD
1
0.4
1
2.5V
≤
V
DD
≤
3.7V
2.5V
≤
V
DD
≤
3.7V
1
0.7 x V
DD
0.3 x V
DD
V
V
kΩ
V
V
µA
V
µA
mV
V
t
ON
_
DEL
DC = logic high
DC = unconnected
V
ON
= 3.3V (Figure 3)
12.8
1.6
t
OFF
_
DEL
After RLYON_ goes low (Figure 3)
4.8
76
3.2
6.4
128
6.4
1
2
4
25.6
3.2
38.4
4.8
ms
ms
%
8.0
180
9.6
ms
V
RLOW
I
RPLUP
V
RCLAMP
RLYON = high, I
RLYD
_ = 100mA
RLYON = high, V
RLYD
_ = 0V
Force 100mA into RLYD, measure V
RLYD
-
V
RLY
RLYON_ = low, V
RLYD
_ = V
RLY
1
0.3
0.8
0.5
1.3
2
V
mA
V
µA
V
OC
t
OC
t
LPFD
Minimum
∆V
across R
SENSE
to detect an
open circuit
(Figure 2)
(V
CSP
_ - V
DRAIN
__
) < V
OC
(Figure 2)
1.5
450
106
3
900
204
4.5
1350
302
mV
ms
ms
V
SGZ
V
OUT
_ = 0V, force 30mA into GATE_,
measure V
GATE
- V
OUT
14
CONDITIONS
During current regulation
MIN
TYP
8
1
15
16.5
18
MAX
UNITS
µA
mA
mA
V
MAX5913A/MAX5914A
Note 1:
See
Typical Operating Characteristics
for Current-Limit Foldback, and refer to
Current Sensing and Regulation
section.
Note 2:
The resistor at RTIM can range from 2kΩ to 40kΩ.
Note 3:
Limits are 100% tested at T
A
= +25°C and T
A
= +85°C. Limits at -40°C are guaranteed by design and characterization, but
are not production tested.
_______________________________________________________________________________________
3
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
MAX5913A/MAX5914A
Typical Operating Characteristics
(V
CSP
_ = V
CC
= +48V, V
DD
= +3.3V, V
RLY
= +12V, V
AGND
= V
DGND
= 0V, RTIM = open, T
A
= +25°C, unless otherwise specified.)
SUPPLY CURRENT
SUPPLY CURRENT
UNDERVOLTAGE LOCKOUT
vs. INPUT VOLTAGE
vs. TEMPERATURE
vs. TEMPERATURE
MAX5913A/14A toc01
MAX5913A/14A toc02
3.8
3.6
SUPPLY CURRENT (mA)
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
T
A
= -40°C
T
A
= +85°C
3.4
3.3
SUPPLY CURRENT (mA)
3.2
V
CC
= +72V
31
V
CC
RISING
UVLO (V)
30
V
CC
FALLING
T
A
= +25°C
3.1
3.0
2.9
2.8
2.7
2.6
2.5
-40
-15
10
V
CC
= +57V
V
CC
= +48V
29
28
V
CC
= +36V
27
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
33 36 39 42 45 48 51 54 57 60 63 66 69 72
INPUT VOLTAGE (V)
GATE OVERDRIVE VOLTAGE
vs. INPUT VOLTAGE
MAX5913A/14A toc04
GATE OVERDRIVE VOLTAGE
vs. TEMPERATURE
MAX5913A/14A toc05
STARTUP WAVEFORMS
MAX5913A/14A toc06
9.50
T
A
= -40°C
GATE OVERDRIVE (V)
9.25
T
A
= +25°C
9.5
V
CC
= +57V
GATE OVERDRIVE (V)
V
CC
= +72V
0
0
B
9.0
V
CC
= +48V
8.5
V
CC
= +36V
0
C
9.00
8.75
T
A
= +85°C
0
D
8.50
33 36 39 42 45 48 51 54 57 60 63 66 69 72
INPUT VOLTAGE (V)
8.0
-40
-15
10
35
60
85
4ms/div
A: V
ON
= V
RLYON
, 5V/div
B: V
RLYD
, 20V/div
C: V
OUT
, 20V/div
D: V
GATE
, 20V/div
TEMPERATURE (°C)
TURN-OFF WAVEFORMS
MAX5913A/14A toc07
GATE TURN-OFF WAVEFORM
MAX5913A/14A toc08
UVLO TURN-ON DELAY
MAX5913A/14A toc09
0
0
A
B
0
A
B
0
B
0
0
0
C
C
0
0
0
D
4ms/div
A: V
ON
= V
RLYON
, 5V/div
B: V
RLYD
, 20V/div
C: V
OUT
, 20V/div
D: V
GATE
, 20V/div
A: V
RLYD
, 20V/div
B: V
RLYON
, 5V/div
C: V
ON
, 5V/div
D: V
GATE
, 20V/div
0
D
0
4ms/div
RLYON = V
DD
A: V
ON
, 5V/div
B: V
CC
, 10V/div
C: V
OUT
, 50V/div
D: V
GATE
, 50V/div
C
D
10ms/div
4
_______________________________________________________________________________________
MAX5913A/14A toc03
4.0
3.5
32
A
A
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
Typical Operating Characteristics (continued)
(V
CSP
_ = V
CC
= +48V, V
DD
= +3.3V, V
RLY
= +12V, V
AGND
= V
DGND
= 0V, RTIM = open, T
A
= +25°C, unless otherwise specified.)
TURN-ON INTO CAPACITIVE LOAD
(C
L
= 0.47µF)
0
MAX5913A/MAX5914A
MAX5913A/14A toc10
TURN-ON INTO CAPACITIVE LOAD
(C
L
= 47µF)
A
B
C
0
MAX5913A/14A toc11
TURN-ON INTO CAPACITIVE LOAD
(C
L
= 470µF)
A
B
C
0
MAX5913A/14A toc12
A
B
C
0
0
0
0
0
0
0
400µs/div
RLYON = V
DD
A: V
ON
, 5V/div
B: V
GATE
, 20V/div
C: V
OUT
, 20V/div
D: I
OUT
, 100mA/div
D
0
1ms/div
RLYON = V
DD
, R
RTIM
= 2kΩ
A: V
ON
, 5V/div
B: V
GATE
, 20V/div
C: V
OUT
, 20V/div
D: I
OUT
, 200mA/div
D
0
10ms/div
RLYON = V
DD
, R
RTIM
= 40kΩ
A: V
ON
, 5V/div
B: V
GATE
, 20V/div
C: V
OUT
, 20V/div
D: I
OUT
, 200mA/div
D
CURRENT-LIMIT FOLDBACK
(V
CC
= +36V)
0
MAX5913A/14A toc13
CURRENT-LIMIT FOLDBACK
(V
CC
= +48V)
A
B
0
MAX5913A/14A toc14
CURRENT-LIMIT FOLDBACK
(V
CC
= +57V)
A
B
0
MAX5913A/14A toc15
A
B
0
C
0
C
0
0
10ms/div
RLYON = V
DD
, R
L
= 100Ω, R
RTIM
= 40kΩ, C
LOAD
= 470µF
A: V
ON
, 5V/div
B: V
OUT
, 10V/div
C: I
OUT
, 200mA/div
0
0
10ms/div
RLYON = V
DD
, R
L
= 139Ω, R
RTIM
= 40kΩ, C
LOAD
= 470µF
A: V
ON
, 5V/div
B: V
OUT
, 10V/div
C: I
OUT
, 200mA/div
10ms/div
RLYON = V
DD
, R
L
= 162Ω, R
RTIM
= 40kΩ, C
LOAD
= 470µF
A: V
ON
, 5V/div
B: V
OUT
, 10V/div
C: I
OUT
, 200mA/div
C
_______________________________________________________________________________________
5
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