19-3263; Rev 1; 7/04
Positive High-Voltage, Hot-Swap Controllers
General Description
The MAX5933A–MAX5933F/MAX5947A/B/C fully integrat-
ed hot-swap controllers for +9V to +80V positive supply
rails (MAX5947A/B/C), allow for the safe insertion and
removal of circuit cards into live backplanes without caus-
ing glitches on the backplane power-supply rail. The
MAX5947B is pin- and function-compatible with the
LT1641-2. The other devices offer added features such
as a choice of active-high or active-low power-good out-
puts (PWRGD/PWRGD), latched/autoretry fault manage-
ment, and autoretry duty-cycle options of 3.75% or 0.94%
(see the
Selector Guide).
The MAX5933A–MAX5933F are available with a default
undervoltage lockout threshold of +31V and operate over
a supply voltage range of +33V to +80V. The
MAX5947A/B/C are available with a default undervoltage
of +8.3V. All devices feature a programmable analog
foldback current limit. If the device remains in current limit
for more than a programmable time, the external
n-channel MOSFET is either latched off (MAX5933A/
MAX5933C/MAX5947A) or is set to automatically restart
after a timeout delay (MAX5933B/MAX5933D/MAX5933E/
MAX5933F/MAX5947B/MAX5947C).
The MAX5933_ and MAX5947_ operate in the extended
temperature range of -40°C to +85°C. These devices are
available in an 8-pin SO package.
Features
♦
Pin- and Function-Compatible with the LT1641-2
(MAX5947B)
♦
Provides Safe Hot Swap for +9V to +80V Power-
Supply Range (MAX5947A/B/C)
♦
Safe Board Insertion and Removal from Live
Backplanes
♦
Latched/Autoretry Management
♦
Active-Low or Active-High Power-Good Output
♦
Programmable Foldback Current Limiting
♦
High-Side Drive for an External N-Channel MOSFET
♦
Built-In Thermal Shutdown
♦
Undervoltage Lockout (UVLO)
♦
Overvoltage Protection
♦
User-Programmable Supply Voltage
Power-Up Rate
MAX5933A–MAX5933F/MAX5947A/B/C
Ordering Information
PART
MAX5933_ESA*
MAX5947_ESA*
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 SO
Applications
Hot Board Insertion
Electronic Circuit Breakers
Industrial High-Side Switch/Circuit Breakers
Network Routers and Switches
24V/48V Industrial/Alarm Systems
*Insert
the desired suffix from the Selector Guide into the blank
to complete the part number.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
Selector Guide
PART
MAX5933A
MAX5933B
MAX5933C
MAX5933D
MAX5933E
MAX5933F
MAX5947A
MAX5947B
MAX5947C
LATCHED
FAULT
PROTECTION
Yes
—
Yes
—
—
—
Yes
—
—
AUTORETRY
FAULT
PROTECTION
—
Yes
—
Yes
Yes
Yes
—
Yes
Yes
PWRGD
OUTPUT LOGIC
High
High
Low
Low
High
Low
Low
High
Low
DUTY CYCLE
(%)
—
3.75
—
3.75
0.94
0.94
—
3.75
3.75
DEFAULT UVLO
(V)
31
31
31
31
31
31
8.3
8.3
8.3
SUPPLY
VOLTAGE
RANGE (V)
33 to 80
33 to 80
33 to 80
33 to 80
33 to 80
33 to 80
9 to 80
9 to 80
9 to 80
________________________________________________________________
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.
Positive High-Voltage, Hot-Swap Controllers
MAX5933A–MAX5933F/MAX5947A/B/C
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND)
V
CC
.........................................................................-0.3V to +85V
SENSE, FB, ON ..........................................-0.3V to (V
CC
+ 0.3V)
TIMER, PWRGD,
PWRGD.......................................-0.3V
to +85V
GATE ......................................................................-0.3V to +95V
Maximum GATE Current ....................................-50mA, +150mA
Maximum Current into Any Other Pin................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ESD Rating (Human Body Model)......................................2000V
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
CC
= +24V (MAX5947A/B/C), V
CC
= +48V (MAX5933A–MAX5933F), GND = 0V, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout
Hysteresis
FB High-Voltage Threshold
FB Low-Voltage Threshold
FB Hysteresis
FB Input Bias Current
FB Threshold Line Regulation
SENSE Trip Voltage
(V
CC
- V
SENSE
)
GATE Pullup Current
GATE Pulldown Current
SYMBOL
V
CC
I
CC
V
LKO
CONDITIONS
MAX5947A/B/C
MAX5933A–MAX5933F
V
ON
= 3V, V
CC
= 80V
V
CC
low-to-high
transition
MAX5947A/B/C
MAX5933A–MAX5933F
FB low-to-high transition
FB high-to-low transition
V
FB
= 0V
V
CC(MIN)
≤
V
CC
≤
80V, ON = 0V,
T
A
= 0°C to +70°C
V
FB
= 0V, T
A
= 0°C to +70°C
V
FB
= 1V, T
A
= 0°C to +70°C
Charge pump on, V
GATE
= 7V
Any fault condition, V
GATE
= 2V
MAX5933A–MAX5933F
External N-Channel Gate Drive
∆V
GATE
V
GATE
- V
CC
V
CC
= 10.8V to 20V,
MAX5947A/B/C
V
CC
= 20V to 80V,
MAX5947A/B/C
TIMER Pullup Current
TIMER Pulldown Current
ON Logic-High Threshold
ON Logic-Low Threshold
I
TIMERUP
I
TIMERON
V
ONH
V
ONL
V
TIMER
= 0V
V
TIMER
= 1V
MAX5933A–MAX5933D,
MAX5947A/B/C
MAX5933E/MAX5933F
ON low-to-high transition
ON high-to-low transition
8
39
-5
35
10
4.5
10
-24
1.5
0.37
1.280
1.221
12
47
-10
70
13.6
6.2
13.2
-80
3
0.75
1.313
1.233
1.280
1.221
-1
MAX5947A/B/C
MAX5933A–MAX5933F
7.5
29.5
MIN
9
33
1.4
8.3
31
0.4
2
1.313
1.233
80
+1
0.05
17
55
-20
100
18
18.0
18
-120
4.5
1.12
1.345
1.245
V
V
µA
µA
V
1.345
1.245
TYP
MAX
80
V
80
3.5
8.8
V
32.5
V
V
V
mV
µA
mV/V
mV
µA
mA
mA
UNITS
V
LKOHYST
V
FBH
V
FBL
V
FBHYST
I
INFB
∆V
FB
V
SENSETRIP
I
GATEUP
I
GATEDN
2
_______________________________________________________________________________________
Positive High-Voltage, Hot-Swap Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +24V (MAX5947A/B/C), V
CC
= +48V (MAX5933A–MAX5933F), GND = 0V, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
ON Hysteresis
ON Input Bias Current
PWRGD Leakage Current
PWRGD
Leakage Current
PWRGD/PWRGD Output Low
Voltage
SENSE Input Bias Current
Thermal Shutdown
Thermal Shutdown Hysteresis
ON Low-to-GATE Low
Propagation Delay
ON High-to-GATE High
Propagation Delay
FB Low-to-PWRGD Low
Propagation Delay
FB High-to-PWRGD High
Propagation Delay
(V
CC
- V
SENSE
) High-to-GATE
Low Propagation Delay
t
PHLON
t
PLHON
t
PHLFB
t
PLHFB
t
PHLSENSE
C
GATE
= 0, Figures 1, 2
C
GATE
= 0, Figures 1, 2
Figures 1, 3
Figures 1, 3
T
A
= +25°C, C
GATE
= 0, Figures 1, 4
0.5
I
SENSE
SYMBOL
V
ONHYST
I
INON
I
OH
I
OL
V
ON
= 0V
V
PWRGD
= 80V
V
PWRGD
= 80V
I
O
= 2mA
I
O
= 4mA
V
SENSE
= 0V to V
CC
Temperature rising
-1
+150
20
6
1.7
3.2
1.5
2
-1
CONDITIONS
MIN
TYP
80
+1
10
10
0.4
2.5
+3
MAX
UNITS
mV
µA
µA
µA
V
µA
°C
°C
µs
µs
µs
µs
µs
MAX5933A–MAX5933F/MAX5947A/B/C
Note 1:
All currents into the device are positive and all currents out of the device are negative. All voltages are referenced to
ground, unless otherwise noted.
_______________________________________________________________________________________
3
Positive High-Voltage, Hot-Swap Controllers
MAX5933A–MAX5933F/MAX5947A/B/C
Test Circuit and Timing Diagrams
ON
V
CC
24V
FB
SENSE
1.313V
FB
t
PLHFB
PWRGD
10nF
1V
1.233V
t
PHLFB
1V
MAX5933_
MAX5947_
V+ = 5V
PWRGD
5kΩ
GATE
GND
TIMER
Figure 1. Test Circuit
Figure 3. FB to PWRGD Timing
1.313V
ON
t
PLHON
GATE
5V
1.233V
t
PHLON
V
CC
- SENSE
GATE
1V
47mV
t
PHLSENSE
V
CC
Figure 2. ON to GATE Timing
Figure 4. SENSE to GATE Timing
4
_______________________________________________________________________________________
Positive High-Voltage, Hot-Swap Controllers
Typical Operating Characteristics
(V
CC
= +48V, T
A
= +25°C, unless otherwise noted.)
FB LOW-VOLTAGE THRESHOLD
vs. TEMPERATURE
MAX5933 toc02
MAX5933A–MAX5933F/MAX5947A/B/C
I
CC
vs. V
CC
MAX5933 toc01
I
CC
vs. TEMPERATURE
3.0
2.5
2.0
I
CC
(mA)
1.5
1.0
0.5
V
CC
= 24V (MAX5947_)
V
CC
= 48V (MAX5933_/MAX5947_)
1.250
1.245
FB LOW-VOLTAGE THRESHOLD (V)
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
0
1.200
-40
-15
10
35
60
85
-40
2.4
2.1
1.8
I
CC
(mA)
1.5
1.2
0.9
0.6
0.3
0
33
40
48
56
V
CC
(V)
64
72
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
80
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
FB HIGH-VOLTAGE THRESHOLD
vs. TEMPERATURE
MAX5933 toc04
FB HYSTERESIS vs. TEMPERATURE
MAX5933 toc05
I
GATE
PULLUP CURRENT
vs. TEMPERATURE
-6
I
GATE
PULLUP CURRENT (µA)
-7
-8
-9
-10
-11
-12
-13
MAX5933 toc06
1.335
1.330
FB HIGH-VOLTAGE THRESHOLD (V)
1.325
1.320
1.315
1.310
1.305
1.300
1.295
1.290
1.285
1.280
-40
-15
10
35
60
0.11
0.10
FB HYSTERESIS (V)
0.09
0.08
0.07
0.06
0.05
0.04
-5
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
GATE DRIVE vs. TEMPERATURE
MAX5933 toc07
MAX5947_
GATE DRIVE vs. V
CC
14
GATE DRIVE (V
GATE
- V
CC
) (V)
12
10
8
6
4
2
MAX5933 toc08
15
14
GATE DRIVE (V
GATE
- V
CC
) (V)
13
12
11
10
9
8
7
6
5
-40
-15
10
35
60
V
CC
= 10.8V (MAX5947_)
V
CC
= 48V (MAX5933_/MAX5947_)
16
85
0
0
10
20
30
40
V
CC
(V)
50
60
70
80
TEMPERATURE (°C)
_______________________________________________________________________________________
MAX5933 toc03
2.7
5
