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PDF ADM1270 Data sheet ( Hoja de datos )
| Número de pieza | ADM1270 | |
| Descripción | High Voltage Input Protection Device | |
| Fabricantes | Analog Devices | |
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Data Sheet
High Voltage Input Protection Device
ADM1270
FEATURES
Controls supply voltages from 4 V to 60 V
Gate drive for low voltage drop reverse supply protection
Gate drive for P-channel FETs
Inrush current limiting control
Adjustable current limit
Foldback current limiting
Automatic retry or latch-off on current fault
Programmable current-limit timer for safe operating area (SOA)
Power-good and fault outputs
Analog undervoltage (UV) and overvoltage (OV) protection
16-lead, 3 mm × 3 mm LFCSP
16-lead QSOP
APPLICATIONS
Industrial modules
Battery-powered/portable instrumentation
GENERAL DESCRIPTION
The ADM1270 is a current-limiting controller that provides
inrush current limiting and overcurrent protection for modular
or battery-powered systems. When circuit boards are inserted
into a live backplane, discharged supply bypass capacitors draw
large transient currents from the backplane power bus as they
charge. These transient currents can cause permanent damage
to connector pins, as well as dips on the backplane supply that
can reset other boards in the system.
The ADM1270 is designed to control the inrush current, when
powering on the system, via an external P-channel field effect
transistor (FET).
To protect the system from a reverse polarity input supply, there
is a provision made to control an additional external P-channel
FET. This feature prevents reverse current flow in case of a reverse
polarity connection, which can damage the load or the ADM1270.
The ADM1270 is available in a 3 mm × 3 mm, 16-lead LFCSP and
a 16-lead QSOP.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
VCC/SENSE+ SENSE–
RPFG
VCAP
LDO
+–
ADM1270
UV
1V
OV
1V
+
–
–
+
IOUT
GATE DRIVE/
LOGIC
GATE
ISET
REF
SELECT
CURRENT-
LIMIT
CONTROL
TIMEOUT
CURRENT
+ LIMIT
–
TIMER
ON
TIMER
VCB
ENABLE FAULT PWRGD GND
Figure 1.
FLB
FB_PG
TIMER_OFF
TIMER
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 ©2014–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADM1270
Data Sheet
Parameter
CURRENT SENSE VOLTAGE
Sense Voltage Current Limit
(VSENSE+ − VSENSE−)
Foldback Inactive
Foldback Active
Circuit Breaker Offset
SEVERE OVERCURRENT
Voltage Threshold
Glitch Filter Duration
Response Time
TIMER PIN
TIMER Pull-Up Current
TIMER High Threshold
TIMER Low Threshold
TIMER Pull-Down Current
TIMER_OFF PIN
Power-On Reset Pull-Up Current
Retry Pull-Up Current
TIMER_OFF High Threshold
FOLDBACK (FLB PIN)
Input Current
PWRGD FEEDBACK INPUT (FB_PG PIN)
Input Current
PWRGD Rising Threshold
PWRGD Threshold Hysteresis
Power-Good Glitch Filter
FAULT PIN
Output Low Voltage
Leakage Current
ENABLE PIN
Input High Voltage
Input Low Voltage
Leakage Current
PWRGD PIN
Output Low Voltage
Output Low Voltage
Leakage Current
Symbol Min Typ Max Unit Test Conditions/Comments
VSENSECL
VCBOS
47 50 53 mV VISET > 2.65 V, VFLB > 1.1 V, ΔVGATE = 3 V, IGATE = 0 µA
62.5
mV VISET = 2.5 V, VFLB > 1.35 V, ΔVGATE = 3 V, IGATE = 0 µA
47 50 53 mV VISET = 2 V, VFLB > 1.1 V, ΔVGATE = 3 V, IGATE = 0 µA
22.5 25.0 27.5 mV VISET = 1 V, VFLB > 0.57 V, ΔVGATE = 3 V, IGATE = 0 µA
10.0 12.5 15.0 mV VISET = 0.5 V, VFLB > 0.3 V, ΔVGATE = 3 V, IGATE = 0 µA
7 10 13 mV VFLB = 0 V, ΔVGATE = 3 V, IGATE = 0 µA
22 25 28 mV VISET > 2 V, VFLB = 0.5 V, ΔVGATE = 3 V, IGATE = 0 µA
0.5 1
1.5 mV Circuit breaker trip voltage, VCB = VSENSECL − VCBOS
VSENSEOC
90
20
0.4
100 110 mV VISET > 2.65 V
25 30 mV VISET = 0.5 V
1.6 µs
2.0 3.5 µs
ITIMERUP
VTIMERH
VTIMERL
ITIMERPD
−18 −20 −22 µA Overcurrent fault, 0.2 V ≤ VTIMER ≤ 2 V
1.96 2.0 2.04 V
0.075 0.10 0.12 V
0.85 1.15 µA Timer pin voltage = 0.2 V
75 105 µA Timer pin voltage = 0.05 V
IPOR
ITMROFF
VTMROFFH
−18
−0.85
1.96
−20
−1
2.0
−22
−1.15
2.04
µA
µA
V
Initial power-on reset, VTIMER_OFF = 1 V
After fault when GATE is off, VTIMER_OFF = 1 V
IFLB 0.005 0.2 µA VFLB ≤ 5.5 V, TA = −40°C to +85°C
0.005 1
µA VFLB ≤ 5.5 V, TA = −40°C to +125°C
IFBPG
VPGTH
PGHYST
PGGF
0.985
25
0.5
0.005
0.005
1.0
30
0.2
1
1.015
35
1.5
µA
µA
V
mV
µs
VFB_PG ≤ 5.5 V, TA = −40°C to +85°C
VFB_PG ≤ 5.5 V, TA = −40°C to +125°C
FB_PG rising
50 mV overdrive
VOL_FAULT
IFAULT
0.005
0.1
0.4
1
V IFAULT = 100 µA
V IFAULT = 1 mA
µA VFAULT = 5.5 V, FAULT output high-Z
VIH 1.2
V
VIL 0.4 V
IEN
0.005 1
µA VEN = 5.5 V
VOL_PWRGD
VOL_PWRGD
IPWRGD
0.005
0.1
0.4
0.4
1
V IPWRGD = 100 µA
V IPWRGD = 1 mA
V VCC = 1.7 V, ISINK = 100 µA,
µA VPWRGD = 60 V, PWRGD output high-Z
Rev. A | Page 4 of 21
5 Page 
ADM1270
20
VIN = 4.5V
18
VIN = 6V
VIN = 10V
16
14
12
10
8
6
4
2
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
Figure 10. VVCAP Overcurrent (OC) Threshold vs. Temperature,
Different Input Voltages
13.0
12.8
12.6
VIN = 14V
VIN = 25V
VIN = 50V
12.4
12.2
12.0
11.8
11.6
11.4
11.2
11.0
–60 –40 –20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 11. GATE Voltage (VGATE) vs. Temperature, Different Input Voltages
13.0
12.8
12.6
VIN = 14V
VIN = 25V
VIN = 50V
12.4
12.2
12.0
11.8
11.6
11.4
11.2
11.0
–60 –40 –20
0 20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 12. RPFG Voltage (VRPFG) vs. Temperature, Different Input Voltages
Data Sheet
10.0
9.8
9.6
VIN = 14V
VIN = 25V
VIN = 50V
9.4
9.2
9.0
8.8
8.6
8.4
8.2
8.0
–60 –40 –20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 13. RPFG Pull-Down Current (IRPFGND) vs. Temperature,
Different Input Voltages
0.070
0.065
4V
25V
50V
0.060
0.055
0.050
0.045
2.50 2.52 2.54 2.56 2.58 2.60 2.62 2.64 2.66 2.68 2.70
VISET (V)
Figure 14. Current Sense Voltage vs. ISET Voltage (VISET),
Different Input Voltages
2.65
2.60
2.55
2.50
–60 –40 –20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 15. Reference Select Threshold Voltage (VISETRSTH) vs. Temperature,
VIN = 4 V
Rev. A | Page 10 of 21
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ADM1270.PDF ] | |
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