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PDF MAX4505 Data sheet ( Hoja de datos )
| Número de pieza | MAX4505 | |
| Descripción | Fault-Protected / High-Voltage / Signal-Line Protector | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX4505 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-1514; Rev 0; 7/99
Fault-Protected, High-Voltage,
Signal-Line Protector
General Description
The MAX4505 is a single signal-line protector featuring a
fault-protected input and Rail-to-Rail® signal handling
capability. The input is protected from overvoltage faults
up to ±36V with power on or ±40V with power off. During
a fault condition, the input terminal becomes an open cir-
cuit and only nanoamperes of leakage current flow from
the source, while the switch output (AOUT) furnishes typ-
ically 19mA from the appropriate polarity supply to the
load. This ensures an unambiguous rail-to-rail output
when a fault begins and ends.
The MAX4505 protects both unipolar and bipolar analog
signals using either unipolar (+9V to +36V) or bipolar
(±8V to ±18V) power supplies. The device has no logic
control inputs; the protector is always on when the sup-
plies are on. On-resistance is 100Ω max, and on-leakage
is less than 0.5nA at TA = +25°C. The MAX4505 is avail-
able in 5-pin SOT23 and 8-pin µMAX packages.
Features
o Overvoltage Protection
±40V with Power Off
±36V with Power On
o Open Signal Paths with Power Off
o Output Clamps to Either Rail with an Input
Overvoltage
o 100Ω max On-Resistance
o 10ns Overvoltage Turn-On Delay
o No Latchup During Power Sequencing
o Rail-to-Rail Signal Handling
o 500Ω Output Clamp Resistance During
Overvoltage
o Tiny 5-Pin SOT23 Package
Applications
Process Control Systems
Hot-Insertion Boards/Systems
Data-Acquisition Systems
Redundant/Backup Systems
ATE Equipment
Sensitive Instruments
Ordering Information
PART
TEMP. RANGE
MAX4505EUK-T -40°C to +85°C
MAX4505EUA -40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
8 µMAX
TOP
MARK
ADLW
—
Typical Operating Circuit
Pin Configurations
TOP VIEW
V-
V-
MAX4505
V- V+
V+
V+
RAIL
SENSOR
AIN 1
5 V-
MAX4505
V+ 2
AOUT 3
4 N.C.
IN AIN
AOUT
OUT
ROUT
SOT23-5
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Fault-Protected, High-Voltage,
Signal-Line Protector
(TA = +25°C, unless otherwise noted.)
FAULT-FREE OUTPUT LEAKAGE CURRENT
(SUPPLIES ON)
100n
VOUT = ±10V
10n
1n IOUT (V+ = +15V, V- = -15V)
100p
10p IOUT (V+ = +12V, V- = 0)
1p
0.1p
0.01p
-55 -30
-5 20 45 70 95
TEMPERATURE (°C)
120 145
Typical Operating Characteristics (continued)
INPUT FAULT LEAKAGE CURRENT
(SUPPLIES ON)
1µ
100n
10n IIN AT +25V (V+ = +15V, V- = -15V)
1n
100p
10p IIN AT +25V (V+ = +12V, V - = 0)
1p
0.1p
-55 -35 -15 5 25 45 65 85 105 125
TEMPERATURE (°C)
POWER SUPPLY CURRENT
vs. TEMPERATURE
80
V+ = +15V
60
V- = -15V
I+
40
20
I+ SINGLE SUPPLY +12V
0
-20
-40 I-
-60
-80
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
SUPPLY CURRENT vs. INPUT VOLTAGE
60
I+
40
20
0
-20
-40
-60
-15
I-
-10 -5
0
5 10 15
INPUT VOLTAGE (V)
FREQUENCY RESPONSE
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90 V+ = +15V
V- = -15V
-100
0.01 0.1
1
10 100
FREQUENCY (MHz)
1000
INPUT OVERVOLTAGE
vs. OUTPUT CLAMPING
MAX4505 toc17
+25V
IN_ IN_
5V/div
0
FAULT-FREE SIGNAL PERFORMANCE
MAX4505 toc16
+15V
IN_
10V/div
-15V
+15V
OUT_
0
10V/div
-15V
5µs/div
FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING
WITH ±15V SUPPLIES
FAULT RECOVERY
MAX4505 toc18
+16V
-25V
0
OUT_
+15V 0
OUT_
0 5V/div
-15V 0
+15V
V+ = +15V
V- = -15V
5µs/div
±25V OVERVOLTAGE INPUT WITH THE OUTPUT
CLAMPED AT ±15V
5µs/div
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX4505.PDF ] | |
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