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MAX5911ESAMAXIMN/a3avai48V Simple Swapper Hot-Swap Switches
MAX5911ESAMAXIM ?N/a10avai48V Simple Swapper Hot-Swap Switches
MAX5912ESEMAXIMN/a5avai48V Simple Swapper Hot-Swap Switches


MAX5911ESA ,48V Simple Swapper Hot-Swap SwitchesFeaturesThe MAX5911/MAX5912 are fully integrated hot-swap Provides Safe Hot Swap for -16V to -65V ..
MAX5911ESA ,48V Simple Swapper Hot-Swap SwitchesApplicationsDGND 4 5 ENABLEIP Phones Internet AppliancesNetwork Routers Power-Over-LAN8 SONetwork S ..
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 ..
MAZ8075G ,Silicon planar typeElectrical Characteristics within Part Numbers T = 25°C±3°CaTemperatureZener Zener riseReversecoef ..
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


MAX5911ESA-MAX5912ESE
48V Simple Swapper Hot-Swap Switches
General Description
The 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
Features
Provides Safe Hot Swap for -16V to -65V Power
Supplies
280mA 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 Switches
Pin Configurationsypical Operating Circuit

19-1832; Rev 0a; 1/01
Ordering Information

Simple Swapper is a trademark of Maxim Integrated Products, Inc.
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
Voltages are with respect to AGND, unless otherwise noted.
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap Switches

SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5911 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
MAX5911 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
ON-RESISTANCE
vs. AMBIENT TEMPERATURE
MAX5911 toc03
TEMPERATURE (°C)
ON-RESISTANCE (
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
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.
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
MAX5912
-48V Simple Swapper Hot-Swap Switches
Pin Description

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.)
MAX5911
MAX5912
-48V Simple Swapper Hot-Swap Switches
Detailed Description

Figure 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
Startup

When 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 Fault

If 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 Fault

The 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 Fault

If |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 Device

The 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
ic,good price


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