19-4344; Rev 0; 10/08
KIT
ATION
EVALU
BLE
AVAILA
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
General Description
Features
o
Hot Swaps Two 7.5V to 76V Supplies
o
Integrates Low-Voltage-Drop ORing Controller
o
±5% Accuracy Bilevel Active Current Limit/Circuit
Breaker
o
Programmable Current-Limit/Circuit-Breaker
Timeout
o
10µA Power-Off Mode Current
o
Protects Up to Two FireWire Ports
o
System Power-On/Off ORing
o
Latchoff or Autoretry Power Management
o
Independent ON/OFF Control Allows
Undervoltage Lockout Programming
o
Fast Load Disconnect through FOSO Input
(FireWire Port)
MAX5963
The MAX5963 dual hot-swap and diode ORing con-
troller provides complete protection for dual-supply high
availability systems. The device operates from 7.5V to
76V and provides hot-swap and low voltage-drop diode
ORing functionality for two 7.5V to 76V outputs.
The MAX5963 allows for the safe insertion and removal
of system line cards and FireWire
®
peripherals into a
live backplane by providing inrush current control and
active current limiting. The device controls external
n-channel power MOSFETs to perform low-voltage-drop
ORing, inrush current control, and current limiting func-
tions. The current-limit function actively limits the cur-
rent drawn by the load, protecting the load from a
short-circuit condition. The MAX5963 also features a
circuit-breaker function that disconnects the power to
the load if the load current exceeds the circuit-breaker
limit for a programmable circuit-breaker timeout.
The MAX5963 features an autoretry/latchoff input. In
autoretry mode, the MAX5963 automatically restarts the
turned-off channel after a programmable delay. In
latchoff mode, the MAX5963 latches the channel off.
The MAX5963 consumes less than 10µA from the PWR
supply in system power-off mode.
The MAX5963 is available in a 40-pin TQFN package
(6mm x 6mm) and operates over the 0°C to +85°C
upper commercial temperature range.
Ordering Information
PART
MAX5963UTL+
TEMP RANGE
0°C to +85°C
PIN-PACKAGE
40 TQFN-EP*
+Denotes
a lead-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
Applications
FAULTA
FAULTB
GATE2B
Blade Servers
Base-Station Line Cards
Network Switches/Routers
FireWire Desktops/Notebook Ports
FireWire Hubs
GATE1B
RETRY
OUTB
GND
N.C.
N.C.
TOP VIEW
30 29 28 27 26 25 24 23 22 21
TCL 31
TCB 32
ONB 33
ONA 34
FOSO 35
ENZ 36
ENY 37
20 SENSEB
19 OR
18 CL
17 CB
16 N.C.
MAX5963
N.C.
15 PS
14 N.C.
13 BP
12 SENSEA
11 N.C.
10
N.C.
Typical Operating Circuit appears at end of data sheet.
ENX 38
N.C. 39
N.C. 40
1
PWR
+
*EP
2
N.C.
3
GATEOR
4
N.C.
5
GATEPS
6
N.C.
7
GATE2A
8
OUTA
9
GATE1A
FireWire is a registered trademark of Apple, Inc.
THIN QFN
(6mm x 6mm)
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
MAX5963
ABSOLUTE MAXIMUM RATINGS
PWR, PS to GND ....................................................-0.3V to +85V
OUTA, OUTB, BP, RETRY to GND .........................-0.3V to +85V
BP to PS .................................................................-0.3V to +85V
BP to PWR ...............................................................-85V to +85V
OUTA, OUTB to PS..................................................-40V to +85V
SENSEA, SENSEB to PS...........................................-1V to +0.3V
SENSEA, SENSEB, CL, CB, OR to GND ................-0.3V to +85V
SENSEA, SENSEB to CL, CB, OR ...............................-5V to +5V
CL, CB, OR to PS .....................................................-1V to +0.3V
GATE1A, GATE2A, GATE1B, GATE2B,
GATEPS, GATEOR to GND .................................-0.3V to +85V
GATE1A, GATE2A to OUTA .....................................-0.3V to +8V
GATE1B, GATE2B to OUTB .....................................-0.3V to +8V
GATEPS to PS ..........................................................-0.3V to +8V
GATEOR to PWR ......................................................-0.3V to +8V
FAULTA, FAULTB
to GND......................................-0.3V to +85V
ONA, ONB, FOSO, TCL,
TCB to GND...........-0.3V to the lesser of +85V or (V
BP
+ 0.3V)
TCL, TCB to GND........................................-0.3V to (V
PS
+ 0.3V)
ENX, ENY, ENZ to GND..........................................-0.3V to +85V
Continuous Power Dissipation
40-Pin TQFN (derate 37mW/°C above +70°C) ...........2963mW
Thermal Resistance (Note 1)
θ
JA
.................................................................................28°C/W
θ
JC
...................................................................................1°C/W
Operating Temperature Range...............................0°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Package thermal resistances obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
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
PS
= V
PWR
= 12V, V
FOSO
= 0, V
ENX
= V
ENY
= V
ENZ
= V
PWR
, and T
A
= T
J
= 0°C to +85°C, unless otherwise noted. See the
Typical
Operating Circuit
for connections. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
PS Voltage Range
PS Supply Current
PWR Voltage Range
PWR Supply Current
SYMBOL
V
PS
I
PS
V
PWR
I
PWR
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
,
V
ONA
= V
ONB
= 3V, no load
7.5V
≤
V
PWR
≤
12V, V
ENX
= V
ENY
= V
ENZ
= 0.4V, PS is open
PWR Shutdown Current
I
PWR_SHDN
12V
≤
V
PWR
≤
76V, V
ENX
= V
ENY
= V
ENZ
= 0.4V, PS is open
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
,
V
ENX
= V
ENY
= V
ENZ
= 0.4V
PS rising, V
ENX
= V
ENY
= V
ENZ
= 0,
V
ONA
= V
ONB
= V
BP
6.0
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
,
V
ONA
= V
ONB
= 3V, no load
7.5
400
5
12
50
6.5
0.35
V
PWR_UVLO
V
PWR
rising, PS = GND, V
ONA
= V
ONB
= V
BP
6.0
6.5
0.35
7.0
CONDITIONS
MIN
7.5
4.5
TYP
MAX
76
7
76
600
10
µA
24
75
7.0
µA
V
V
V
V
UNITS
V
mA
V
µA
PWR Standby Current
PS Undervoltage Lockout
Threshold
PS Undervoltage Lockout
Hysteresis
PWR Undervoltage Lockout
Threshold
PWR Undervoltage Lockout
Hysteresis
I
PWR_SB
V
PS_UVLO
2
_______________________________________________________________________________________
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
PS
= V
PWR
= 12V, V
FOSO
= 0, V
ENX
= V
ENY
= V
ENZ
= V
PWR
, and T
A
= T
J
= 0°C to +85°C, unless otherwise noted. See the
Typical
Operating Circuit
for connections. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
LOGIC INPUTS
ON_ Threshold
ON_ Hysteresis
ON_ Input Bias Current
EN_ Input Logic-Low Voltage
Threshold
EN_ Input Logic-High Voltage
Threshold
EN_ Input Bias Current
RETRY Pulldown Current
RETRY Input Logic-Low Voltage
Threshold
RETRY Input Logic-High
Voltage Threshold
FOSO Threshold
FOSO Hysteresis
FOSO Input Leakage Current
TCL, TCB Input Bias Current in
Shutdown
FAULT_
Output Low Voltage
FAULT_
Output High Leakage
Current
OUT_ Input Current
SENSE_ Input Current
I
FOSOL
I
TCL
, I
TCB
V
OL
I
OH
I
OUT_
I
SENSE_
V
ONTH
V
ONTH_HYS
I
ON
V
EN_L
V
EN_H
I
EN_
I
RTRY
V
RTRYL
V
RTRYH
V
FOSO_TH
V
ONA
or V
ONB
= 3V
V
ONA
or V
ONB
= 3V
V
ENZ
= 0, V
FOSO
= V
PWR
= 76V
V
ENZ
= 0, V
PS
= 76V, V
TCL
= V
TCB
= 76V
Low-impedance state, I
FAULTA
= I
FAULTB
= 5mA
High-impedance state, V
FAULTA
= V
FAULTB
= 76V
V
ENZ
= 0, V
PS
= 76V, V
OUTA
= V
OUTB
= 76.1V
V
ENZ
= 0, V
PS
= V
OR
= V
CL
= V
CB
= 76V,
V
SENSEA
= V
SENSEB
= 76V
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
I
CLSET
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
I
ORSET
I
ORHYS
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
15
1
50
0.12
1.8
1.150
1.240
70
1
4
0.275
1
100
4
1.350
V
EN_
= 76V, V
FOSO
= 0
V
RETRY
= 0.7V
20
0.7
1.8
1
V
ON_
= 76V
V
ON_
rising
1.150
1.240
70
1
0.7
1.350
V
mV
µA
V
V
µA
µA
V
V
V
mV
µA
µA
V
µA
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5963
CIRCUIT-BREAKER, CURRENT-LIMIT, AND ORING THRESHOLDS
Circuit-Breaker Set Current
Circuit-Breaker Comparator
Offset Voltage
Current-Limit Set Current
Current-Limit Comparator Offset
Voltage
ORing Threshold Set Current
ORing Threshold Set Current
Hysteresis
I
CBSET
97.0
-2.5
97.0
-2.5
96.5
47.5
100
50
100.0
100.0
103.2
+2.5
103.2
+2.5
103.5
52.5
µA
mV
µA
mV
µA
µA
_______________________________________________________________________________________
3
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
MAX5963
ELECTRICAL CHARACTERISTICS (continued)
(V
PS
= V
PWR
= 12V, V
FOSO
= 0, V
ENX
= V
ENY
= V
ENZ
= V
PWR
, and T
A
= T
J
= 0°C to +85°C, unless otherwise noted. See the
Typical
Operating Circuit
for connections. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
ORing Threshold Comparator
Offset Voltage
ORing Threshold Comparator
Total Offset Voltage Supply Drift
ORing Threshold Comparator
Total Offset Temperature Drift
Fast Pulldown Current-Limit
Threshold Voltage
TIMING
Circuit-Breaker Timeout
Circuit-Breaker Default Timeout
Circuit-Breaker Timeout Count-
Down/Count-Up Ratio
Current-Limit Timeout
Current-Limit Default Timeout
Current-Limit Timeout Count-
Down/Count-Up Ratio
Automatic Restart Delay after
Current-Limit Timeout
Automatic Restart Delay after
Circuit-Breaker Timeout
Channel A/Channel B FOSO
Turn-On Delay
ON_ Turn-On Response Time
(Time from ON_ Pulled High to
GATE_ Pulled High)
ON_ Turn-Off Response Time
(Time from ON_ Pulled Low to
GATE_ Pulled Low)
FOSO Turn-Off Response Time
(Time from FOSO Rising Edge
to GATE_ Pulled Low)
Minimum Delay from ENZ Low
to Low-Current Shutdown Mode
t
OFFCL
t
OFFCB
t
FOSOF
V
ONA
= V
ONB
= 3V, FOSO falling
0.4
t
CL
R
TCL
= 4kΩ (Note 4)
V
TCL
= V
BP
0.85
0.85
t
CB
R
TCB
= 4kΩ (Note 4)
V
TCB
= V
BP
0.85
2.2
1.02
3.0
1
1.02
1.02
128
t
CL
x
128
t
CB
x
128
1.0
1.5
ms
ms
s
1.23
1.23
ms
ms
1.23
3.8
ms
ms
V
THF
SYMBOL
CONDITIONS
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
(Note 3)
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
0°C
≤
T
A
≤
+85°C, V
PS
= V
PWR
7.5V
≤
V
PWR
≤
76V, V
PS
= V
PWR
MIN
-0.4
TYP
0
100
40
V
CL
+
57
MAX
+0.4
UNITS
mV
µV
µV
mV
t
ON_
2
ms
t
ON_OFF
V
ON_
< V
ONTH_HYST
, (V
GATE_
- V
OUT
_)
< 1V, GATE_A and GATE_B are open
10
µs
t
FOSO_OFF
(V
GATE_A
- V
OUTA
) < 1V, (V
GATE_B
- V
OUTB
)
< 1V, GATE_A and GATE_B are open
ENZ steps from 1.3V to 0.4V
0.34
0.60
µs
t
SHDN
50
µs
4
_______________________________________________________________________________________
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
MAX5963
ELECTRICAL CHARACTERISTICS (continued)
(V
PS
= V
PWR
= 12V, V
FOSO
= 0, V
ENX
= V
ENY
= V
ENZ
= V
PWR
, and T
A
= T
J
= 0°C to +85°C, unless otherwise noted. See the
Typical
Operating Circuit
for connections. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
GATE CONTROLS
GATE_ Pullup Current
I
GU_
V
GATE1A
,
V
GATE2A
,
V
GATE1B
,
V
GATE2B
,
V
GATEPS
,
V
GATEOR
V
GATE1A
- V
OUTA
,
V
GATE2A
- V
OUTA
,
V
GATE1B
- V
OUTB
,
V
GATE2B
- V
OUTB
,
V
GATEPS
- V
PS
,
V
GATEOR
- V
PWR
V
PWR
= V
PS
,
7.5V
≤
V
PWR
≤
8V,
V
OUTA
= V
OUTB
= V
PS
V
PWR
= V
PS
,
8V
≤
V
PWR
≤
76V,
V
OUTA
= V
OUTB
= V
PS
35
4.00
48
4.75
60
6.00
V
4.50
5.50
6.50
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GATE_ High Voltage
GATE_ Pulldown Current
I
GDA1
,
I
GDA2
,
V
CL
< (V
PS
- V
SENSE_
) < V
THF
I
GDB1
, I
GDB2
I
GDFA1
,
I
GDFA2
,
I
GDFB1
,
I
GDFB2
I
GDPA1
,
I
GDPA2
,
I
GDPB1
,
I
GDPB2
I
GOFFA1
,
I
GOFFA2
,
I
GOFFB1
,
I
GOFFB2
I
GDPS
R
GATEOR
350
500
650
µA
GATE_ Fast Pulldown Current
(V
PS
- V
SENSE_
) > V
THF
,
V
GATE_
= (V
OUT_
+ 4.5V)
40
125
190
mA
GATE_ Peak Pulldown Current
(V
PS
- V
SENSE_
) = 1V
1.0
A
GATE_ Pulldown Current During
Any GATE_ Turn-Off Condition
GATEPS Pulldown Current
GATEOR Turn-Off Switch
On-Resistance
V
GATE_
= (V
OUT_
+ 4.5V), V
PS
> V
PS_UVLO
V
GATE_
= (V
OUT_
+ 4.5V), V
PS
= 6V
V
ENZ
= 0, V
GATEPS
- V
PS
= 4.5V
Measured between GATEOR and V
PWR
,
(V
SENSEA
+ V
SENSEB
)/2 > V
OR
,
V
GATEOR
- V
PWR
= 2V
40
30
45
125
200
mA
150
125
2
200
3
mA
Ω
Note 2:
All min/max parameters are tested at T
A
= +25°C and T
A
= +85°C. Limits through the temperature range are guaranteed by
design.
Note 3:
This is the offset value immediately after initialization. The MAX5963 minimizes offset at startup according to the temperature
at that time. After initialization the temperature offset voltage drift and supply voltage drift apply.
Note 4:
Connect TCL/TCB to BP or PS for the default timeout period or connect a resistor from TCL/TCB to GND to program the cur-
rent-limit timeout.
_______________________________________________________________________________________
5
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