MAX5911ESA+ ,-48V, Simple Swapper Hot-Swap SwitchesApplicationsDGND 4 5 ENABLEIP Phones Internet AppliancesNetwork Routers Power-Over-LAN8 SONetwork S ..
MAX5912ESE ,48V Simple Swapper Hot-Swap SwitchesELECTRICAL SPECIFICATIONS(V = -48V, AGND = DGND = 0, UVLO = open circuit, V = +3.3V, and T = -40°C ..
MAX5912ESE+ ,-48V, Simple Swapper Hot-Swap SwitchesELECTRICAL SPECIFICATIONS(V = -48V, AGND = DGND = 0, UVLO = open circuit, V = +3.3V, and T = -40°C ..
MAX5913AEMH ,+48V Quad Hot-Swap Controllers For Power-Over-LANApplicationsSTAT2 3 31 OCENSTAT3 4 30 DGNDPower-Over-LANSTAT4 5 29 VCCPower-Over-MDI CSP1CSP4 6 MAX ..
MAX5913EMH ,+48V Quad Hot-Swap Controllers For Power-Over-LANApplicationsSTAT2 3 31 OCENSTAT3 4 30 DGNDPower-Over-LANSTAT4 5 29 VCCPower-Over-MDI CSP4 6 MAX5913 ..
MAX5915EUI ,Dual PCI 2.2 Hot-Swap ControllersApplicationsOrdering InformationPCI 2.2 ServerFAULT TEMP PIN-PCI ServerPARTMANAGEMENT RANGE PACKAGE ..
MAZ8075-H ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8075-L ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaMarking SymbolParameter Symbol Rating UnitRefer to the list of t ..
MAZ8075-M ,Silicon planar typeFeatures•Extremely low noise voltage caused from the diode (2.4V to 39V,1/3 to 1/10 of our conventi ..
MAZ8082-H ,Silicon planar typeFeatures•Extremely low noise voltage caused from the diode (2.4V to 39V,1/3 to 1/10 of our conventi ..
MAZ8082-L ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8082-M ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAX5911ESA+-MAX5912ESE+
-48V, Simple Swapper Hot-Swap Switches
General DescriptionThe MAX5911/MAX5912 are fully integrated hot-swap
switches for negative supply rails. These devices allow
the safe insertion and removal of circuit cards into live
backplanes or ports without causing problematic glitch-
es on the negative power-supply rail. They also monitor
various circuit parameters and disconnect the load if a
fault condition occurs, alerting the host with a logic-level
FAULToutput. The MAX5911/MAX5912 operate over a
voltage range of -16V to -65V and are designed to permit
hot plugging of an IP phone into a hub, but are not limit-
ed to that operation.
During startup, an internal power FET regulates the cur-
rent between the backplane power source and the load
to 280mA for MAX5911 and 415mA for MAX5912. After
startup, the FET is fully enhanced to reduce its on-resis-
tance. To ensure robust operation, the MAX5911/
MAX5912 contain built-in safety features that prevent
damage to the internal FET. They include an enable
input, which responds to positive logic signals (+3.3V or
+5V), allowing the host system to disconnect the load.
ENABLE is also used to reset the device after a latching
fault condition occurs.
The MAX5911/MAX5912 Simple Swapper™ hot-swap
ICs monitor four parameters for these fault conditions:
undervoltage lockout (UVLO), power-not-good, zero-
current detection, and thermal shutdown. These
devices are available in the extended temperature
range, -40°C to +85°C. The MAX5911 and MAX5912
come in 8-pin and 16-pin SOIC packages, respectively.
Applications
FeaturesProvides Safe Hot Swap for -16V to -65V Power
Supplies280mA Current Limit for MAX5911415mA Current Limit for MAX5912Zero-Current Load Disconnect Integrated Power FET Status Output Reports Fault ConditionInternal Switch-Protection CircuitryBuilt-In Thermal ShutdownDGND Can Vary Up to ±5V with Respect to AGND
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap SwitchesAGND
ENABLEDGND
UVLO
VOUTVIN
FAULT
GATE
8 SOTOP VIEW
MAX5911
VOUT
VIN
N.C.*
N.C.*
UVLO
N.C.*
16 SOMAX5912
ENABLE
N.C.*
VIN
AGND
VIN
GATE
VIN
N.C.*
DGND
FAULT
*THESE PINS ARE NOT INTERNALLY CONNECTED.
Pin ConfigurationsVIN
FAULT
ENABLE
DGND
UVLO
AGND
POSITIVE
LOGIC
0.1μF
3.3kΩ
+3.3V
VOUT
LOAD
VIN (-48V)
MAX5911
MAX5912
AGNDDGND
ypical Operating Circuit19-1832; Rev 0a; 1/01
Ordering InformationSimple Swapper is a trademark of Maxim Integrated Products, Inc.
PARTTEMP. RANGEPIN-PACKAGE
MAX5911ESA-40°C to +85°C8 SO
MAX5912ESE-40°C to +85°C16 SO
IP Phones
Network Routers
Network Switches
Internet Appliances
Power-Over-LAN
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap Switches
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL SPECIFICATIONS(VIN= -48V, AGND = DGND = 0, UVLO = open circuit, VENABLE= +3.3V, and TA= -40°C to +85°C, unless otherwise noted. Typical
values are at TA= +25°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.
VIN..........................................................................+0.3V to -70V
VOUT............................................................+0.3V to (VIN- 0.3V)
ENABLE to DGND..................................................-0.3V to +11V
ENABLE to VIN.......................................................-0.3V to +70V
FAULTto DGND.....................................................-0.3V to +11V
UVLO to VIN............................................................-0.3V to +11V
DGND..........................................................................-5V to +5V
DGND to VIN...........................................................-0.3V to +70V
FAULTSink Current............................................................10mA
Continuous Output Current...............................Internally Limited
Continuous Power Dissipation (TA= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
16-Pin SO (derate 12.9mW/°C above +70°C)...........1039mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSInput Voltage RangeVIN-65-16V
Supply CurrentIINMeasured at AGND at the end of output
voltage slew1.52.5mA
MAX5911-310-280-250Maximum VOUT CurrentIOUT(MAX)VOUT = VIN + 5VMAX5912-457-415-373mA
DMOS On-ResistanceRDS(ON)MAX5911 IOUT = -225mA,
MAX5912 IOUT = -350mA2.54Ω
VOUT Leakage CurrentMeasured on VOUT when internal DMOS is
shut off10µA
ENABLE Low VoltageVILReferenced to DGND0.8V
ENABLE High VoltageVIHReferenced to DGND2.0V
ENABLE High Input CurrentIIHVENABLE = +3.3V140300µA
ENABLE Low Pulse Width
(Note 1)tEPW200ns
FAULT Output Low VoltageVOLI FAULT = 3mA0.4V
FAULT Output Leakage CurrentIOHV FAULT = +3.3V10μA
Zero-Current Detection
ThresholdIFTHDecreasing load current-12-8-4mA
Zero-Current Detection
Threshold HysteresisIFHY1.5mA
Zero-Current Detection Delay
(Note 2)IFDEL280350520ms
Current-Limit Delay (Note 3)tLIMITVOUT shorted to AGND1020µs
Power-Good ThresholdVPG|VIN - VOUT|, |VIN - VOUT| decreasing1.952.152.35V
Power-Good HysteresisPGHYS% of VPG5%
Voltages are with respect to AGND, unless otherwise noted.
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap SwitchesSUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5911 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
NO LOAD
SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
MAX5911 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
NO LOAD
ON-RESISTANCE
vs. AMBIENT TEMPERATURE
MAX5911 toc03
TEMPERATURE (°C)
ON-RESISTANCE (
ILOAD = 150mA
Typical Operating Characteristics (VIN= -48V, AGND = DGND = 0, UVLO = open circuit, VENABLE= +3.3V, RLOAD= 1.8kΩ, TA= +25°C, unless otherwise noted.)
ELECTRICAL SPECIFICATIONS (continued)(VIN= -48V, AGND = DGND = 0, UVLO = open circuit, VENABLE= +3.3V, and TA= -40°C to +85°C, unless otherwise noted. Typical
values are at TA= +25°C.)
Note 1:Minimum ENABLE low pulse width required to unlatch fault condition.
Note 2:The delay from IOUTfalling below the zero-current threshold until FAULTis latched low and VOUTis disabled.
Note 3:The time from an output overcurrent or short-circuit condition until the output goes into current limit.
Note 4:The time from VOUTfalling until FAULTis asserted low. FAULTis not latched for Power-Not-Good condition.
Note 5:When the device goes into thermal shutdown, the output is disabled and FAULTis latched low.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSPower-Not-Good Output Delay
(Note 4)PGDELAfter |VIN - VOUT| increases above
(VPG + PGHYS)81420ms
Thermal Shutdown Temperature
(Note 5)TJ140oC
Default UVLOUVLO open circuit, |VIN| increasing-30-28-26V
UVLO HysteresisUVLO open circuit, percentage of UVLO
threshold12%
UVLO Comparator ThresholdReferenced to VIN, UVLO open circuit,
|VIN| increasing+1.258V
UVLO Input ResistanceRUVLO95kΩ
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap Switches
Typical Operating Characteristics (continued)(VIN= -48V, AGND = DGND = 0, UVLO = open circuit, VENABLE= +3.3V, RLOAD= 1.8kΩ, TA= +25°C, unless otherwise noted.)
MAX5911 TURN-OFF WAVEFORMS
(RL = 1.8kΩ, CL = NONE)MAX5911 toc06
t = 10μs/div
A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
t = 100ms/div
MAX5911 TURN-OFF WAVEFORMS
(RL = 1.8kΩ, CL = 47µF)A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
MAX5911 toc07
MAX5911 TURN-ON WAVEFORMS
(RL = 1.8kΩ, CL = NONE)MAX5911 toc04
t = 10μs/div
A: ENABLE, 5V/div
B: VOUT, 20V/div
C: FAULT, 2V/div
t = 2ms/div
MAX5911 TURN-ON WAVEFORMS
(RL = 1.8kΩ, CL = 47µF)A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
MAX5911 toc05
MAX5911
OVERCURRENT RESPONSEMAX5911 toc08
t = 50ms/div
B: VOUT, 50V/div
A: FAULT, 5V/div C: IOUT, 200mA/div
MAX5911
ZERO-CURRENT RESPONSEMAX5911 toc09
t = 50ms/div
B: VOUT, 50V/div
A: FAULT, 5V/div C: IOUT, 50mA/div
t = 10µs/div
MAX5912 TURN-ON WAVEFORMS
(RL = 1.8kΩ, CL = NONE)A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
MAX5911 toc10
t = 1ms/div
MAX5912 TURN-ON WAVEFORMS
(RL = 1.8kΩ, CL = 47µF)MAX5911 toc11
A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
t = 10µs/div
MAX5912 TURN-OFF WAVEFORMS
(RL = 1.8kΩ, CL = NONE)A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
MAX5911 toc12
MAX5911
MAX5912
-48V Simple Swapper Hot-Swap Switches
Pin Description
PIN
MAX5911MAX5912
NAMEFUNCTION3GATE
Gate of the Internal Power MOSFET. Normally leave open circuit. To slow
down the output voltage ramp, connect two capacitors, one to VIN and one to
VOUT. See GATE Connections for details.4, 5, 12, 13VINVoltage Input Terminal. Bypass VIN, to AGND with a 0.1µF capacitor to
improve noise immunity.FAULTFault Logic Output, open-drain. Tie FAULT to the positive logic supply with a
3.3kΩ resistor. Referenced to DGND.7DGND
Digital Ground. Ground reference level for the external positive logic, FAULT,
and ENABLE. DGND can vary up to ±5V with respect to AGND to
accommodate differential ground voltages in large systems.10ENABLE
ENABLE Input. Turns on and off the internal FET. ENABLE is a positive logic-
level input referenced to DGND. Drive ENABLE high to enable VOUT. Drive
ENABLE low to disable VOUT. Pulse ENABLE low to reset the MAX5911/
MAX5912 after a latched fault condition occurs.11AGNDAnalog Ground. Ground reference level for VIN, VOUT, and UVLO.
714VOUTVoltage Output Terminal15UVLO
Undervoltage Lockout Input. Leave UVLO open circuit for default setting
of -28V. Alternatively, UVLO can be connected to a resistive divider to set the
lockout voltage (see the Changing the Undervoltage Lockout Setting section).
The comparator threshold level is +1.258V with respect to VIN.1, 2, 8, 9, 16N.C.No Connection. No internal connection.
t = 100ms/div
MAX5912 TURN-OFF WAVEFORMS
(RL = 1.8kΩ, CL = 47µF)A: ENABLE, 5V/div C: FAULT, 2V/div
B: VOUT, 20V/div
MAX5911 toc13
Typical Operating Characteristics (continued)(VIN= -48V, AGND = DGND = 0, UVLO = open circuit, VENABLE= +3.3V, RLOAD= 1.8kΩ, TA= +25°C, unless otherwise noted.)
t = 40ms/div
MAX5912
OVERCURRENT RESPONSEA: FAULT, 5V/div C: IOUT, 200mA/div
B: VOUT, 20V/div
MAX5911 toc14
t = 40ms/div
MAX5912
ZERO-CURRENT RESPONSEA: FAULT, 5V/div C: IOUT, 100mA/div
B: VOUT, 20V/div
MAX5911 toc15
MAX5911
MAX5912
-48V Simple Swapper Hot-Swap Switches
Detailed DescriptionFigure 1 shows a functional block diagram. The
MAX5911/MAX5912 are hot-swap switches for negative
supply rails. The devices allow the safe insertion and
removal of circuit cards into live backplanes or ports
without causing undue glitches on the negative power-
supply rail. They operate over the -16V to -65V voltage
range. The devices act as a current regulator, using
their on-board FET to limit the amount of current drawn
from the backplane to 280mA for MAX5911 and 415mA
for MAX5912. If the load current exceeds that current
limit, the internal switch behaves like a constant current
source.
The MAX5911/MAX5912 monitor the input voltage, the
output voltage, the output current, and the die tempera-
ture. They assert their FAULToutput if they detect an
error condition.
A zero-current load disconnect feature activates if the
load current drops below 8mA for over 350ms. They also
include an enable input that responds to positive logic,
allowing the host system to turn the FET switch on or off.
The enable input is also used to reset the devices after
an error condition has latched the output FET off.
Normal Operation
StartupWhen power is first applied with ENABLE high, or when
ENABLE is asserted, the MAX5911/MAX5912 limit the
current to the load to 280mA/415mA. If the output volt-
age has not reached the power-good threshold within
the 14ms power-good delay, FAULTis pulled low.
FAULTstays low until the output voltage exceeds the
power-good threshold, at which time it is released and
becomes high impedance.
Undervoltage Lockout FaultIf VIN≤UVLO, where UVLO is the desired voltage
at which the UVLO fault occurs, FAULTis pulled low
and the internal FET is turned off. If the condition per-
sists for over 350ms (IFDEL), the FET is latched off. The
default UVLO voltage is -28V, but it can be adjusted
using an external resistive divider (see the Changing
the Undervoltage Lockout Settingsection). Once the
FET is latched off, ENABLE must be pulsed low then
brought back high to release FAULTand enable VOUT.
Thermal Shutdown FaultThe MAX5911/MAX5912 monitor their internal die tem-
peratures. If the temperature of the die exceeds
+140°C, FAULTis pulled low and the internal FET is
latched off. ENABLE must be pulsed low and then
brought high again to reset the FET latch, and release
FAULT, provided the die is below the thermal shutdown
temperature by 5°C (typ).
Power-Not-Good FaultIf |VIN - VOUT| is more than the power-good threshold
for over 14ms, FAULTis pulled low. When the output
voltage exceeds the power-good threshold, FAULTis
released. FAULToutput is not latched during a power-
not-good fault.
Zero-Current Detection If the load current drops below 8mA for over 350ms,
FAULTis pulled low and the FET is latched off. ENABLE
must be pulsed low and then brought high again to
release FAULTand enable VOUT.
Applications Information
Chosing A DeviceThe MAX5911 will output up to 280mA (typ) and the
MAX5912 up to 415mA (typ). In applications where
high heat is expected, use the MAX5912 for its superior
UVLO
AGND
ENABLE
VIN
FAULT
DGND
LEVEL
SHIFTER
CONTROL
LOGIC
2.11MΩ
99.5kΩ
+1.258VREF
VOUT
MAX5911/MAX5912
GATE
|VIN|
VPG (min) = 1.8V
VPG |VIN - VOUT|,
VPG (typ) = 2V
VPG (max) = 2.2V
|VOUT|
POWER GOOD POWER-NOT-GOOD DELAY
POWER-GOOD
HYSTERESIS
(5% OF VPG)
Figure 1. Functional Block Diagram
