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MAX8533EUB
Smallest, Most Reliable, 12V, InfiniBand-Compliant Hot-Swap Controller
General DescriptionThe MAX8533 is a single-port, 12V, InfinibandTM-compli-
ant (IB) versatile hot-swap controller. The device can be
implemented in both IB Class I (nonisolated) and Class II
(isolated) power-topology applications. Additionally, the
MAX8533 can be used as a reliable power controller on
hot-swappable blade servers, RAID cards, and network
switches or routers that are powered from a 12V bus.
The MAX8533 integrates several features that allow reli-
able insertion and removal of the circuit card, as well as
real-time monitoring of abnormal occurrences. The
MAX8533 allows for an adjustable soft-start ramp during
turn-on of the input voltage, while providing overcurrent
protection. It also provides accurate and consistent cur-
rent-regulated outputs for a programmable period of time
to latch off and soft-start in the presence of overcurrent
conditions (OC). Additionally, it provides a second level
of severe overcurrent (SOC) protection by responding to
a dead short in 100ns. The MAX8533 also includes
adjustable overvoltage protection.
The MAX8533 incorporates undervoltage lockout
(UVLO) and a power-good (POK) signal to the DC-to-
DC converters to confirm the status of output voltage
rails during operation. Two enable inputs EN (logic
enable) and LPEN (local power enable) provide flexible
sequencing. The MAX8533 is specified across the
extended temperature range and has an absolute maxi-
mum rating of 16V to withstand inductive kickback dur-
ing board removal.
The MAX8533 is available in the space-saving 10-pin
µMAX package.
Applications12V Hot-Swap
Infiniband Bulk Power
Hot-Swap/Plug/Dock Power Management
Blade Servers
RAID
Network Routers and Switches
Features12V Hot-Swap Controller for 25W or 50W
Infiniband PortsProgrammable Overcurrent Protection Regulation
LevelEN and LPEN Inputs for Flexible SequencingPower-Good Signal16V Absolute Maximum Rating Withstands
Inductive KickbacksSoft-Start Overcurrent Protection During Turn-OnTimed Current Regulation Period (Adjustable)100ns IC Response Time to Output Dead ShortAdjustable Overvoltage ProtectionUndervoltage LockoutAdjustable Turn-On Ramp
MAX8533
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
Ordering Information19-2849; Rev 0; 4/03
Pin Configuration appears at end of data sheet.Infiniband is a trademark of InfinibandSMTrade Association.
PARTTEMP RANGEPIN-PACKAGEMAX8533EUB-40°C to +85°C 10 µMAX
MAX8533
VB_IN
BACKPLANE
10V TO 14V
INFINIBAND
MODULE
ISETGATEOUT
VB_OUT
VIN
OVP
POKRET
VB_RET
CTIM
LPENLPENVBxEN
ypical Operating Circuit
MAX8533
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +12V, VEN= 0, TA= 0°°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.
IN, POK to RET.......................................................-0.3V to +16V
GATE to RET...................................................-0.3V to (VIN+ 7V)
OUT, ISET, CTIM to RET..............................-0.3V to (VIN+ 0.3V)
EN, LPEN, OVP to RET.............................................-0.3V to +6V
Continuous Power Dissipation (TA= +70°C)
10-Pin µMax (derate 5.6 mW/°C above +70°C).......444.4 mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
VB BULK SUPPLY CONTROL
IN Supply Voltage Range101214V
ISET Current Source18.52021.5µA
Current-Limit Offset VoltageVISET - VIN-40+4mV
OUT Input CurrentVOUT = 12V612µA
Severe Overcurrent ThresholdWith respect to current regulation threshold150mV
25W OUT Current RegulationRISET = 3.09kΩ ±1%, RSENSE = 20mΩ ±1%2.63.13.6A
50W OUT Current RegulationRISET = 3.09kΩ ±1%, RSENSE = 10mΩ ±1%5.26.27.2A
GATE PARAMETERS
Gate Response Time to Severe
Overcurrent
VRSENSE ≥ (150mV + current regulation threshold +
50mV) until VGATE begins to slew low (Note 1)100ns
Gate Response Time to
Overcurrent
VRSENSE ≥ current regulation threshold + 50mV until
VGATE begins to slew low (Note 1)600ns
Gate Turn-On Current8.41011.6µA
Overcurrent, VRSENSE ≥ (current regulation threshold +
100mV) (Note 1)2.7Gate Pulldown Current
Severe overcurrent350
Gate High VoltageVIN + 4VIN + 5V
IN PARAMETERS
Quiescent Supply Current1.53mA
IN UVLO ThresholdHysteresis = 300mV7.58.49.0V
POK Undervoltage ThresholdMeasured at OUT, rising edge, hysteresis = 300mV9.29.610.0V
POK DelayVPOK rising100220350µs
POK Output VoltageVOUT < 9.2V, IPOK = 1.6mA0.10.25V
POK Leakage CurrentVOUT > 10V, VPOK = 14V0.11µA
EN Rising ThresholdHysteresis = 120mV1.31.652.0V
EN Pullup VoltageEN unconnected4.55.5V
EN Pullup Current122028µA
MAX8533
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
PARAMETERCONDITIONSMINTYPMAXUNITS
LPEN Rising ThresholdHysteresis = 120mV1.31.652.0V
LPEN Pullup VoltageLPEN unconnected4.55.5V
LPEN Pullup Current122028µA
OVP Threshold VoltageHysteresis = 10mV, VOVP rising1.962.002.04V
OVP Fault Timeout1.5ms
CTIM PARAMETERS
CTIM Charging CurrentVCTIM < 1.5V162024µA
CTIM Fault Pullup CurrentVCTIM = 6V6812mA
Current-Limit Timeout Threshold
Voltage1.51.82.1V
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +12V, VEN= 0, TA= 0°°C to +85°°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
VB BULK SUPPLY CONTROL
IN Supply Voltage Range1014V
ISET Current SourceCurrent regulation threshold = ISET x RISET1822µA
Current-Limit Offset VoltageVISET - VIN-4+4mV
OUT Input CurrentVOUT = 12V12µA
25W OUT Current RegulationRISET = 3.09kΩ ±1%, RSENSE = 20mΩ ±1%2.53.7A
50W OUT Current RegulationRISET = 3.09kΩ ±1%, RSENSE = 10mΩ ±1%5.07.4A
GATE PARAMETERS
Gate Turn-On Current812µA
Gate High VoltageVIN + 4V
IN PARAMETERS
Quiescent Supply Current3mA
IN UVLO ThresholdHysteresis = 300mV7.59.0V
POK Undervoltage ThresholdMeasured at OUT, rising edge, hysteresis = 300mV9.010.2V
POK DelayVPOK rising100350µs
POK Output VoltageVOUT < 9.2V, IPOK = 1.6mA0.25V
POK Leakage CurrentVOUT > 10V, VPOK = 14V1µA
EN Rising ThresholdHysteresis = 120mV1.32.0V
EN Pullup VoltageEN unconnected4.5V
EN Pullup Current1228µA
ELECTRICAL CHARACTERISTICS
(VIN= +12V, VEN= 0, TA= -40°°C to +85°°C, unless otherwise noted.) (Note 2)
HOT PLUG WITH 10V INPUT
INTO 50W LOAD
MAX8533 toc01
VIN
IIN
VOUT
VPOK10V/div
10V/div
20ms/div
5A/div
10V/div
HOT PLUG WITH 14V INPUT
INTO 65W LOAD
MAX8533 toc02
VIN
IIN
VOUT
VPOK
10V/div
10V/div
20ms/div
5A/div
10V/div
HOT PLUG INTO SHORT CIRCUIT
MAX8533 toc03
VIN
IIN
VOUT
VPOK
20ms/div
5A/div
10V/div
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
ON/OFF CONTROL WITH EN TOGGLED
MAX8533 toc04
VEN
IIN
VOUT
VPOK10V/div
200ms/div
5A/div
10V/div
10V/div
ON/OFF CONTROL WITH LPEN TOGGLED
MAX8533 toc05
VLPEN
IIN
VOUT
VPOK10V/div
200ms/div
5A/div
5V/div
10V/div
MAX8533
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
PARAMETERCONDITIONSMINTYPMAXUNITS
LPEN Rising ThresholdHysteresis = 120mV1.32.0V
LPEN Pullup VoltageLPEN unconnected4.5V
LPEN Pullup Current1228µA
OVP Threshold VoltageHysteresis = 10mV, VOVP rising1.962.04V
CTIM PARAMETERS
CTIM Charging CurrentVCTIM < 1.5V1525µA
CTIM Fault Pullup CurrentVCTIM = 6V612mA
Current-Limit Timeout Threshold
Voltage1.42.2V
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +12V, VEN= 0, TA= -40°°C to +85°°C, unless otherwise noted.) (Note 2)
Note 1:The current regulation threshold is set by R3 (Figure 2). It is equal to 20µA x R3.
Note 2:Specifications to -40°C are guaranteed by design and not production tested.
MAX8533
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
INPUT OVERVOLTAGE PROTECTION
FAULT CONDITION
MAX8533 toc07
IIN
VOUT
VGATE10V/div
2ms/div
10V/div
5V/div
SHORT-CIRCUIT CURRENT PROTECTION
MAX8533 toc08
IIN
VOUT
VGATE
12V
10μs/div
10V/div
2A/div
VIN
10V/div
OUTPUT-VOLTAGE RISE TIME AS
A FUNCTION OF GATE CAPACITOR (C2)
MAX8533 toc09
VOUT0V
40ms/div
5V/div
0.022μF
0.047μF0.1μF0.22μF0.47μF
INPUT-CURRENT RISE TIME AS
A FUNCTION OF GATE CAPACITOR (C2)
MAX8533 toc10
IIN0A
40ms/div
2A/div
0.022μF
0.047μF0.1μF0.22μF0.47μF
HOT UNPLUG
MAX8533 toc11
IIN
VOUT
VIN
10V/div
4ms/div
10V/div
2A/div
HOT PLUG INTO
INPUT OVERVOLTAGE CONDITION
MAX8533 toc06
VIN
VOUT
VGATE10V/div
40ms/div
10V/div
10V/divypical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX8533
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
Pin Description
PINNAMEFUNCTIONISETCurrent-Limit Threshold Programming Input. Connect to the low side of the current-limit threshold
programming resistor.INBulk Power Supply. Connect to the input power supply and positive terminal of the current-sense resistor.GATE
External MOSFET-Gate-Drive Output. Connect to the gate of the external N-channel MOSFET. A series
resistor and capacitor connected from GATE to RET sets the turn-on ramp rate. At turn-on, this capacitor is
charged to VIN + 5V (typ) by an internal current source. GATE is pulled to RET when EN is high and/or LPEN
is low. GATE is pulled to RET during a fault condition.CTIM
Current Regulation Time Programming Input. Connect a capacitor from CTIM to RET. The capacitance at
CTIM determines the time delay between an overcurrent event and chip output shutdown (current-limit
timeout). CTIM is pulled low, resetting the fault latch when either EN is high or LPEN is low.RETBulk Power GroundOVPOvervoltage Protection Input. Connect to common point of a resistor-divider from OUT to RET. GATE pulls
low when VOVP exceeds the 2V threshold for at least 1.5ms and the IC is latched off.OUTOutput Voltage. Connect to the output of the circuit.
8POKP ow er - Good Outp ut. P O K i s an op en- d r ai n outp ut that b ecom es hi g h i m p ed ance w hen V OU T r eaches 9.6V . P ul l OK up to the sup p l y r ai l usi ng an exter nal p ul l up r esi stor . P OK i s p ul l ed to RE T unti l the M AX 8533 i s enab l ed .LPENLocal Power-Enable Input. LPEN is a positive-assertion enable input to turn on the IC. Pull LPEN low to
disable the output. LPEN has an internal pullup to 5V.ENChip-Enable Input. EN is an active-low input that enables the IC.
Detailed Description
The MAX8533 is a single-port, 12V, IB-compliant versa-
tile hot-swap controller IC designed for applications
where a line card is inserted into a live backplane. The
MAX8533 can be implemented in both IB Class I (non-
isolated) and Class II (isolated) power-topology appli-
cations. Normally, when a line card is plugged into a
live backplane, the low impedance of the card’s dis-
charged filter capacitors can momentarily collapse the
input supply voltage. The MAX8533 is designed to
reside on the line card and to provide inrush current-
limiting and short-circuit protection. This is achieved
using an external N-channel MOSFET, current-sense
resistor, and current-limit set resistor, along with two
on-chip comparators (Figure 1).
UVLO and Startup
The MAX8533 has an undervoltage lockout protection
circuit. The circuit is disabled when VINis below 8.4V
(typ). The gate of the MOSFET, CTIM, LPEN, and POK is
pulled to RET until VINexceeds the UVLO threshold.
Once VINexceeds the UVLO threshold and LPEN and
EN are enabled, the capacitor on the gate of the exter-
nal MOSFET is charged and the MOSFET turns on. The
charging of this capacitor provides soft-start to prevent
high inrush currents.
On/Off Control
The MAX8533 is enabled/disabled using LPEN and EN.
Drive EN low and LPEN high to enable the device. LPEN
can also be left unconnected as it is internally connected
to 5V. Drive LPEN low or EN high to disable the output.
Table 1 is the truth table for these inputs.LPENOUTPUT0OFFON0OFF1OFF
Table 1. Truth Table
Zero is a logic-low input, 1 is a logic-high input or unconnected
input.
