MAX5913 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – +48V Quad Hot-Swap Controllers For Power-Over-LAN

19-2244; Rev 2; 11/02
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
General Description
The MAX5913/MAX5914 are quadruple hot-swap con-
trollers. The MAX5913/MAX5914 independently control
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. 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 MAX5913/MAX5914 feature an internal undervolt-
age 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 MAX5913 features an active-low relay
driver that sinks current when the relay output is
enabled. The MAX5914 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 MAX5913/
MAX5914 use an external sense resistor to enable all
the internal current-sense functions.
The MAX5913/MAX5914 feature a programmable ana-
log 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 MAX5913/MAX5914 are available in a 44-pin MQFP
package and are specified for the extended -40°C to
+85°C operating temperature range.
Applications
Power-Over-LAN
Power-Over-MDI
IP Phone Switches/Routers
Telecom Line Cards
Network Switches/Routers
Mid-Span Power-Over-MDI
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
PART
MAX5913EMH
MAX5914EMH
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
44 MQFP
44 MQFP
TOP VIEW
Pin Configuration
FAULT 1
STAT1 2
STAT2 3
STAT3 4
STAT4 5
CSP4 6
DRAIN4 7
OUT4 8
GATE4 9
CSP3 10
DRAIN3 11
MAX5913
MAX5914
33 RTRYEN
32 STATOUT
31 OCEN
30 DGND
29 V_CC
28 CSP1
27 DRAIN1
26 GATE1
25 OUT1
24 CSP2
23 DRAIN2
Typical Operating Circiut appears at end of data sheet.
MQFP
________________________________________________________________ Maxim Integrated Products 1
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