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PDF MAX5933F Data sheet ( Hoja de datos )
| Número de pieza | MAX5933F | |
| Descripción | Positive High-Voltage Hot-Swap Controllers | |
| Fabricantes | Maxim Integrated Products | |
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19-3263; Rev 1; 7/04
www.DataSheet4U.com
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.
Applications
Hot Board Insertion
Electronic Circuit Breakers
Industrial High-Side Switch/Circuit Breakers
Network Routers and Switches
24V/48V Industrial/Alarm Systems
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5933_ESA*
-40°C to +85°C 8 SO
MAX5947_ESA*
-40°C to +85°C 8 SO
*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.
1 page  
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Positive High-Voltage, Hot-Swap Controllers
(VCC = +48V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
33
ICC vs. VCC
TA = +25°C
TA = +85°C
TA = -40°C
40 48 56 64 72 80
VCC (V)
ICC vs. TEMPERATURE
3.0
2.5
2.0
VCC = 48V (MAX5933_/MAX5947_)
1.5
1.0
VCC = 24V (MAX5947_)
0.5
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
-40
FB LOW-VOLTAGE THRESHOLD
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
1.335
1.330
1.325
1.320
1.315
1.310
1.305
1.300
1.295
1.290
1.285
1.280
-40
FB HIGH-VOLTAGE THRESHOLD
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
FB HYSTERESIS vs. TEMPERATURE
0.11
0.10
0.09
0.08
0.07
0.06
0.05
0.04
-40
-15 10 35 60
TEMPERATURE (°C)
85
-5
-6
-7
-8
-9
-10
-11
-12
-13
-40
IGATE PULLUP CURRENT
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
GATE DRIVE vs. TEMPERATURE
15
14 VCC = 48V (MAX5933_/MAX5947_)
13
12
11
10
9
8
7 VCC = 10.8V (MAX5947_)
6
5
-40
-15 10 35 60
TEMPERATURE (°C)
85
MAX5947_
GATE DRIVE vs. VCC
16
14
12
10
8
6
4
2
0
0 10 20 30 40 50 60 70 80
VCC (V)
85
_______________________________________________________________________________________ 5
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Positive High-Voltage, Hot-Swap Controllers
RESPONSE TIME TO OVERCURRENT
14
12
10
8
6
4
2
0
0 100 200
VCC - VSENSE (mV)
Figure 8. Response Time to Overcurrent
300
TIMER
TIMER provides a method for programming the maxi-
mum time the device is allowed to operate in current
limit. When the current-limit circuitry is not active,
TIMER is pulled to GND by a 3µA current source. After
the current-limit circuit becomes active, an 80µA pullup
current source is connected to TIMER, and the voltage
rises with a slope equal to 77µA/CTIMER, as long as the
current-limit circuit remains active. Once the desired
maximum current-limit time is chosen, the capacitor
value is:
C(nF) = 65 x t(ms)
or
TLIMIT = (CTIMER/80µA) x 1.233V
When the current-limit circuit turns off, TIMER is dis-
charged to GND by the 3µA current source.
Whenever TIMER reaches 1.233V, the internal fault
latch is set. GATE is immediately pulled to GND and
TIMER is pulled back to GND by the 3µA current
source. When TIMER falls below 0.5V, ON is pulsed low
to reset the internal fault latch.
The waveform in Figure 9 shows how the output latches
off following a short circuit. The drop across the sense
resistor is held at 12mV as the timer ramps up. Since
the output did not rise, FB remains below 0.5V and the
circuit latches off. For Figure 9, CT = 100nF.
Undervoltage and Overvoltage Detection
ON can be used to detect an undervoltage condition at
the power-supply input. ON is internally connected to
an analog comparator with 80mV of hysteresis. If ON
falls below its threshold voltage (1.233V), GATE is
pulled low and is held low until ON is high again.
SHORT-CIRCUIT WAVEFORMS
OUTPUT
50V/div
ISENSE
1A/div
GATE
50V/div
TIMER
1V/div
10ms/div
Figure 9. Short-Circuit Waveforms
Figure 10 shows an overvoltage detection circuit. When
the input voltage exceeds the Zener diode’s breakdown
voltage, D1 turns on and starts to pull TIMER high. After
TIMER is pulled higher than 1.233V, the fault latch is set
and GATE is pulled to GND immediately, turning off
transistor Q1 (see Figure 11). Operation is restored
either by interrupting power or by pulsing ON low.
Power-Good Detection
The MAX5933_/MAX5947_ include a comparator for mon-
itoring the output voltage. The noninverting input (FB) is
compared against an internal 1.233V precision reference
and exhibits 80mV hysteresis. The comparator’s output
(PWRGD) is open drain and capable of operating from a
pullup as high as 80V. The PWRGD is similar to PWRGD
with an opposite polarity (active low) output.
The PWRGD (PWRGD) can be used to directly
enable/disable a power module with an active-high
enable input. Figure 12 shows how to use PWRGD to
control an active-low enable-input power module. Signal
inversion is accomplished by transistor Q2 and R7.
Supply Transient Protection
The MAX5933_/MAX5947_ are 100% tested and guar-
anteed to be safe from damage with supply voltages
up to 80V. However, spikes above 85V may damage
the device. During a short-circuit condition, the large
change in currents flowing through the power-supply
traces can cause inductive voltage spikes which could
exceed 85V. To minimize the spikes, the power-trace
parasitic inductance should be minimized by using
wider traces or heavier trace plating and a 0.1µF
bypass capacitor placed between VCC and GND. A
transient voltage suppressor (TVS) at the input can also
prevent damage from voltage surges.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX5933F.PDF ] | |
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