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PDF ADM1172 Data sheet ( Hoja de datos )
| Número de pieza | ADM1172 | |
| 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 Power-Fail Comparator
ADM1172
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
Power-fail comparator
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 ADM1172 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 over-
current 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 pin capacitor
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 ADM1172
operates with a supply voltage ranging from 2.7 V to 16.5 V.
The ADM1172 also features a power-fail comparator. The
voltage on the PFI pin is compared with an internal 0.6 V
reference, and the output of this comparator is presented on
the PFO pin. This device is available in two options: the
ADM1172-1 with automatic retry for overcurrent fault and the
ADM1172-2 with latch-off for an overcurrent fault. Toggling
the ON (ON-CLR) pin resets a latched fault. The ADM1172 is
packaged in an 8-lead TSOT.
VIN = 5V
GND
FUNCTIONAL BLOCK DIAGRAM
LONG
RSENSE
Q1
SHORT RON1
RON2
LONG
VCC SENSE
ON GATE
ADM1172-1
PFI
TIMER
GND
CTIMER
PFO
VOUT = 5V
CLOAD
RPR1
RPR2
GND
Figure 1.
Rev. A
Document Feedback
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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 ©2006–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADM1172
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
PFI Pin
−0.3 V to +20 V
PFO Pin
−0.3 V to +20 V
GATE Pin
Storage Temperature Range
Operating Temperature Range
Lead Temperature (10 sec)
Junction Temperature
−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 
ADM1172
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
0.620
0.615
0.610
0.605
0.600
HIGH THRESHOLD
0.595
0.590
LOW THRESHOLD
0.585
0.580
0
2 4 6 8 10 12 14 16
SUPPLY VOLTAGE (V)
Figure 31. PFI Threshold vs. Supply Voltage
18
0.610
0.605
0.600
HIGH THRESHOLD
0.595
0.590
LOW THRESHOLD
0.585
0.580
–50
0 50 100
TEMPERATURE (°C)
Figure 32. PFI Threshold vs. Temperature
150
–3.0
–3.5
–4.0
–4.5
–5.0
VCC = 5V
VCC = 3V
–5.5
–6.0
–6.5
–7.0
–7.5
VCC = 12V
VCC = 15V
–8.0
–50
0
50 100
TEMPERATURE (°C)
Figure 33. PFO Pull-Up Current vs. Temperature
150
Rev. A | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ADM1172.PDF ] | |
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