19-2849; Rev 0; 4/03
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
General Description
The MAX8533 is a single-port, 12V, Infiniband
TM
-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.
Features
o
12V Hot-Swap Controller for 25W or 50W
Infiniband Ports
o
Programmable Overcurrent Protection Regulation
Level
o
EN and LPEN Inputs for Flexible Sequencing
o
Power-Good Signal
o
16V Absolute Maximum Rating Withstands
Inductive Kickbacks
o
Soft-Start Overcurrent Protection During Turn-On
o
Timed Current Regulation Period (Adjustable)
o
100ns IC Response Time to Output Dead Short
o
Adjustable Overvoltage Protection
o
Undervoltage Lockout
o
Adjustable Turn-On Ramp
MAX8533
Ordering Information
PART
MAX8533EUB
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
Typical Operating Circuit
VB_OUT
Applications
12V Hot-Swap
Infiniband Bulk Power
Hot-Swap/Plug/Dock Power Management
Blade Servers
RAID
Network Routers and Switches
VBxEN
LPEN
VB_RET
BACKPLANE
VB_IN
INFINIBAND
MODULE
10V TO 14V
IN
EN
LPEN
ISET
GATE
OUT
OVP
MAX8533
V
IN
Pin Configuration appears at end of data sheet.
Infiniband is a trademark of Infiniband
SM
Trade Association.
CTIM
RET
POK
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
MAX8533
ABSOLUTE MAXIMUM RATINGS
IN, POK to RET .......................................................-0.3V to +16V
GATE to RET ...................................................-0.3V to (V
IN
+ 7V)
OUT, ISET, CTIM to RET ..............................-0.3V to (V
IN
+ 0.3V)
EN, LPEN, OVP to RET .............................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +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
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
IN
= +12V, V
EN
= 0,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
VB BULK SUPPLY CONTROL
IN Supply Voltage Range
ISET Current Source
Current-Limit Offset Voltage
OUT Input Current
Severe Overcurrent Threshold
25W OUT Current Regulation
50W OUT Current Regulation
GATE PARAMETERS
Gate Response Time to Severe
Overcurrent
Gate Response Time to
Overcurrent
Gate Turn-On Current
Gate Pulldown Current
Gate High Voltage
IN PARAMETERS
Quiescent Supply Current
IN UVLO Threshold
POK Undervoltage Threshold
POK Delay
POK Output Voltage
POK Leakage Current
EN Rising Threshold
EN Pullup Voltage
EN Pullup Current
Hysteresis = 300mV
Measured at OUT, rising edge, hysteresis = 300mV
V
POK
rising
V
OUT
< 9.2V, I
POK
= 1.6mA
V
OUT
> 10V, V
POK
= 14V
Hysteresis = 120mV
EN unconnected
1.3
4.5
12
7.5
9.2
100
1.5
8.4
9.6
220
0.1
0.1
1.65
5.5
20
28
3
9.0
10.0
350
0.25
1
2.0
mA
V
V
µs
V
µA
V
V
µA
Overcurrent, V
RSENSE
≥
(current regulation threshold +
100mV) (Note 1)
Severe overcurrent
V
RSENSE
≥
(150mV + current regulation threshold +
50mV) until V
GATE
begins to slew low (Note 1)
V
RSENSE
≥
current regulation threshold + 50mV until
V
GATE
begins to slew low (Note 1)
8.4
100
600
10
2.7
350
V
IN
+ 4 V
IN
+ 5
V
11.6
ns
ns
µA
mA
V
ISET
- V
IN
V
OUT
= 12V
With respect to current regulation threshold
R
ISET
= 3.09kΩ
±1%,
R
SENSE
= 20mΩ
±1%
R
ISET
= 3.09kΩ
±1%,
R
SENSE
= 10mΩ
±1%
2.6
5.2
10
18.5
-4
12
20
0
6
150
3.1
6.2
3.6
7.2
14
21.5
+4
12
V
µA
mV
µA
mV
A
A
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
ELECTRICAL CHARACTERISTICS (continued)
°
°
(V
IN
= +12V, V
EN
= 0,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
LPEN Rising Threshold
LPEN Pullup Voltage
LPEN Pullup Current
OVP Threshold Voltage
OVP Fault Timeout
CTIM PARAMETERS
CTIM Charging Current
CTIM Fault Pullup Current
Current-Limit Timeout Threshold
Voltage
V
CTIM
< 1.5V
V
CTIM
= 6V
16
6
1.5
20
8
1.8
24
12
2.1
µA
mA
V
Hysteresis = 10mV, V
OVP
rising
Hysteresis = 120mV
LPEN unconnected
CONDITIONS
MIN
1.3
4.5
12
1.96
TYP
1.65
5.5
20
2.00
1.5
28
2.04
MAX
2.0
UNITS
V
V
µA
V
ms
MAX8533
ELECTRICAL CHARACTERISTICS
°
°
(V
IN
= +12V, V
EN
= 0,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
VB BULK SUPPLY CONTROL
IN Supply Voltage Range
ISET Current Source
Current-Limit Offset Voltage
OUT Input Current
25W OUT Current Regulation
50W OUT Current Regulation
GATE PARAMETERS
Gate Turn-On Current
Gate High Voltage
IN PARAMETERS
Quiescent Supply Current
IN UVLO Threshold
POK Undervoltage Threshold
POK Delay
POK Output Voltage
POK Leakage Current
EN Rising Threshold
EN Pullup Voltage
EN Pullup Current
Hysteresis = 300mV
Measured at OUT, rising edge, hysteresis = 300mV
V
POK
rising
V
OUT
< 9.2V, I
POK
= 1.6mA
V
OUT
> 10V, V
POK
= 14V
Hysteresis = 120mV
EN unconnected
1.3
4.5
12
28
7.5
9.0
100
3
9.0
10.2
350
0.25
1
2.0
mA
V
V
µs
V
µA
V
V
µA
8
V
IN
+ 4
12
µA
V
Current regulation threshold = I
SET
x R
ISET
V
ISET
- V
IN
V
OUT
= 12V
R
ISET
= 3.09kΩ
±1%,
R
SENSE
= 20mΩ
±1%
R
ISET
= 3.09kΩ
±1%,
R
SENSE
= 10mΩ
±1%
2.5
5.0
10
18
-4
14
22
+4
12
3.7
7.4
V
µA
mV
µA
A
A
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
MAX8533
ELECTRICAL CHARACTERISTICS (continued)
°
°
(V
IN
= +12V, V
EN
= 0,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
LPEN Rising Threshold
LPEN Pullup Voltage
LPEN Pullup Current
OVP Threshold Voltage
CTIM PARAMETERS
CTIM Charging Current
CTIM Fault Pullup Current
Current-Limit Timeout Threshold
Voltage
V
CTIM
< 1.5V
V
CTIM
= 6V
15
6
1.4
25
12
2.2
µA
mA
V
Hysteresis = 10mV, V
OVP
rising
Hysteresis = 120mV
LPEN unconnected
CONDITIONS
MIN
1.3
4.5
12
1.96
28
2.04
TYP
MAX
2.0
UNITS
V
V
µA
V
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.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
HOT PLUG WITH 10V INPUT
INTO 50W LOAD
MAX8533 toc01
HOT PLUG WITH 14V INPUT
INTO 65W LOAD
MAX8533 toc02
HOT PLUG INTO SHORT CIRCUIT
MAX8533 toc03
V
IN
10V/div
0V
10V/div
V
IN
0V
10V/div
V
POK
0V
V
POK
10V/div
V
OUT
0V
5A/div
0A
20ms/div
V
IN
10V/div
0V
V
POK
10V/div
0V
0V
0V
5A/div
0A
V
OUT
I
IN
10V/div
0V
5A/div
0A
20ms/div
V
OUT
I
IN
I
IN
20ms/div
ON/OFF CONTROL WITH EN TOGGLED
MAX8533 toc04
ON/OFF CONTROL WITH LPEN TOGGLED
MAX8533 toc05
V
EN
10V/div
0V
V
LPEN
5V/div
0V
10V/div
0V
10V/div
V
OUT
0V
5A/div
0A
V
POK
V
OUT
10V/div
0V
10V/div
0V
5A/div
0A
V
POK
I
IN
I
IN
200ms/div
200ms/div
4
_______________________________________________________________________________________
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
MAX8533
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
HOT PLUG INTO
INPUT OVERVOLTAGE CONDITION
MAX8533 toc06
INPUT OVERVOLTAGE PROTECTION
FAULT CONDITION
MAX8533 toc07
10V/div
V
IN
0V
V
GATE
10V/div
0V
V
OUT
10V/div
0V
V
GATE
10V/div
0V
I
IN
V
OUT
10V/div
0V
0A
40ms/div
2ms/div
5V/div
SHORT-CIRCUIT CURRENT PROTECTION
MAX8533 toc08
OUTPUT-VOLTAGE RISE TIME AS
A FUNCTION OF GATE CAPACITOR (C2)
MAX8533 toc09
0.047µF 0.1µF
V
OUT
10V/div
0.022µF
0V
V
IN
V
GATE
12V
10V/div
0V
I
IN
2A/div
0A
V
OUT
0.22µF
0.47µF
5V/div
0V
10µs/div
40ms/div
INPUT-CURRENT RISE TIME AS
A FUNCTION OF GATE CAPACITOR (C2)
MAX8533 toc10
HOT UNPLUG
MAX8533 toc11
0.047µF 0.1µF
0.022µF
0.22µF
0.47µF
V
IN
2A/div
10V/div
0V
V
OUT
10V/div
0V
I
IN
0A
I
IN
2A/div
0A
40ms/div
4ms/div
_______________________________________________________________________________________
5
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