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PDF ADM1171 Data sheet ( Hoja de datos )
| Número de pieza | ADM1171 | |
| Descripción | Hot Swap Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
2.7 V to 16.5 V Hot Swap Controller
with Current Sense Output
ADM1171
FEATURES
Controls supply rails from 2.7 V to 16.5 V
Allows protected board removal and insertion to a live
backplane
External sense resistor provides adjustable analog current
limit with circuit breaker
Peak fault current limited with fast response
Charge pumped gate drive for external N-FET switch
Current sense output
Soft start inrush current control
Automatic retry or latch-off during current fault
Undervoltage lockout
8-lead, TSOT package
APPLICATIONS
Hot swap board insertion: line cards, raid systems
Industrial high-side switches/circuit breakers
Electronic circuit breakers
GENERAL DESCRIPTION
The ADM1171 is a hot swap controller that safely enables a
printed circuit board to be removed and inserted to a live
backplane. This is achieved using an external N-channel power
MOSFET with a current control loop that monitors the load
current through a sense resistor. An internal charge pump is
used to enhance the gate of the N-channel FET. When an
overcurrent condition is detected, the gate voltage of the FET is
reduced to limit the current flowing through the sense resistor.
During an overcurrent condition, the TIMER cap determines
the amount of time the FET remains at a current limiting mode
of operation until it is shut down. The ON (ON-CLR) pin is the
enable input for the device and can be used to monitor the
input supply voltage. The ADM1171 operates with a supply
voltage ranging from 2.7 V to 16.5 V.
The ADM1171 features soft start to provide the user with a
capacitor programmable ramping reference to the internal
current sense comparator. This provides a linearly increasing
current limit at startup at a rate set by CSS. This helps to reduce
and limit large inrush currents.
The ADM1171 also features a current sense output (CSOUT)
pin. The voltage on the CSOUT pin represents the voltage drop
across the sense resistor gained up by a factor of 20.
This device is available in two options: the ADM1171-1 with
automatic retry for overcurrent fault and the ADM1171-2 with
latch-off for an overcurrent fault. Toggling the ON (ON-CLR)
pin resets a latched fault. The ADM1171 is packaged in an
8-lead TSOT.
VIN = 5V
GND
FUNCTIONAL BLOCK DIAGRAM
LONG
RSENSE
Q1
VCC SENSE
VOUT = 5V
CLOAD
SHORT RON1
GATE
ADM1171-1
ON
RON2
LONG
SS
CSS CSOUT
TIMER
GND
CTIMER
GND
Figure 1.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2006–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADM1171
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
VCC Pin
SENSE Pin
−0.3 V to +20 V
−0.3 V to +20 V
VCC − SENSE
TIMER Pin
ON (ON-CLR) Pin
±5 V
−0.3 V to (VCC + 0.3 V)
−0.3 V to +20 V
SS Pin
CSOUT Pin
GATE Pin
Storage Temperature Range
Operating Temperature Range
Lead Temperature (10 sec)
Junction Temperature
–0.3 V to (VCC + 0.3 V)
–0.3 V to (VCC + 0.3 V)
−0.3 V to (VCC + 11 V)
−65°C to +125°C
−40°C to +85°C
300°C
150°C
Data Sheet
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL CHARACTERISTICS
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
8-Lead TSOT
θJA
152.9
Unit
°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. A | Page 4 of 16
5 Page 
ADM1171
12
10
8
6
4
2
0
0 2 4 6 8 10 12 14 16
SUPPLY VOLTAGE (V)
Figure 28. GATE Current (down) vs. Supply Voltage
18
–8
–9
–10
–11
–12
–13
–14
0 2 4 6 8 10 12 14 16
SUPPLY VOLTAGE (V)
Figure 29. GATE Current (up) vs. Supply Voltage
18
–11.0
–11.2
–11.4
–11.6
–11.8
–12.0
–12.2
–12.4
–12.6
VCC = 5V
VCC = 15V
VCC = 3V
VCC = 12V
–12.8
–13.0
–50
–25 0
25 50 75 100 125
TEMPERATURE (°C)
Figure 30. GATE Current (up) vs. Temperature
150
Data Sheet
–10.4
–10.5
–10.6
VCC = 3V
–10.7
–10.8
–10.9
VCC = 12V
VCC = 5V
VCC = 15V
–11.0
–50
–25 0
25 50 75 100 125
TEMPERATURE (°C)
Figure 31. Soft Start Current vs. Temperature
150
50
45
40
35
30
25
20
15
10
5
0
0 0.2 0.4 0.6 0.8 1.0 1.2
SOFT START VOLTAGE (V)
Figure 32. Circuit Breaker Voltage vs. Soft Start Voltage
0.5
VSENSE = 50mV
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
5 10 15 20 25 30
SUPPLY VOLTAGE (V)
Figure 33 CSOUT Total Output Error vs. Supply Voltage
Rev. A | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ADM1171.PDF ] | |
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