Maxim MAX4505EUK-T, MAX4505EUA Datasheet
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MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
________________________________________________________________
Maxim Integrated Products
1
19-1514; Rev 0; 7/99
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 circuit and only nanoamperes of leakage current flow from
the source, while the switch output (AOUT) furnishes typically 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 supplies are on. On-resistance is 100Ω max, and on-leakage
is less than 0.5nA at TA= +25°C. The MAX4505 is available in 5-pin SOT23 and 8-pin µMAX packages.
Applications
Process Control Systems
Hot-Insertion Boards/Systems
Data-Acquisition Systems
Redundant/Backup Systems
ATE Equipment
Sensitive Instruments
Features
♦ Overvoltage Protection
±40V with Power Off
±36V with Power On
♦ Open Signal Paths with Power Off
♦ Output Clamps to Either Rail with an Input
Overvoltage
♦ 100Ω max On-Resistance
♦ 10ns Overvoltage Turn-On Delay
♦ No Latchup During Power Sequencing
♦ Rail-to-Rail Signal Handling
♦ 500Ω Output Clamp Resistance During
Overvoltage
♦ Tiny 5-Pin SOT23 Package
IN AIN
R
OUT
OUTAOUT
RAIL
SENSOR
V-
V- V+
V-
V+
V+
MAX4505
Typical Operating Circuit Pin Configurations
V+
N.C.AOUT
15V-AIN
MAX4505
SOT23-5
TOP VIEW
2
34
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations continued at end of data sheet.
Ordering Information
PART TEMP. RANGE
PIN-
PACKAGE
TOP
MARK
ADLW
5 SOT23-5-40°C to +85°CMAX4505EUK-T
MAX4505EUA -40°C to +85°C 8 µMAX —
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING GUIDELINES
ELECTRICAL CHARACTERISTICS—Dual Supplies
(V+ = +15V, V- = -15V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltages referenced to GND)
V+........................................................................-0.3V to +44.0V
V- .........................................................................-44.0V to +0.3V
V+ to V-................................................................-0.3V to +44.0V
AIN, AOUT (Notes 1, 2) .......................................................±44V
AIN Overvoltage with Power On ..........................................±36V
AIN Overvoltage with Power Off ..........................................±40V
Continuous Current into Any Terminal..............................±30mA
Peak Current into Any Terminal
(pulsed at 1ms, 10% duty cycle)...............................±70mA
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23-5 (derate 7.10mW/°C above +70°C) ...571mW
8-Pin µMAX (derate 4.10mW/°C above +70°C) ........330mW
Operating Temperature Ranges
MAX4505C_ _ ..................................................0°C to +70°C
MAX4505E_ _ ...............................................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
V+ to GND..............................................................-0.3V to +40V
V- to GND ...............................................................-32V to +0.3V
V+ to V- ..................................................................................40V
AIN.......................................................................................±40V
AOUT...............................................................................V+ to V-
AIN to AOUT.........................................................40V differential
Continuous Current into Any Terminal ..............................≤30mA
Peak Current into Any Terminal
(pulsed at 1ms, 10% duty cycle) ...............................≤70mA
T
A
PARAMETER SYMBOL MIN TYP MAX UNITSCONDITIONS
E
Fault-Free Analog Signal Range
(Note 4)
V
AIN
V- V+ VV
AIN
= ±15V
E 125
Ω
+25°C
Analog Signal-Path Resistance R
ON
65 100
V
AIN
= ±10V, I
AOUT
= 1mA
E -20 20
nA
+25°C
Signal-Path Leakage Current
(Note 5)
I
AOUT(ON)
-0.5 0.5
V
AOUT
= ±10V, V
AIN
= ±10V
or floating
pF+25°CInput Capacitance C
AIN
20V
AIN
= 0, f = 1MHz
E -40 40
V
E
Fault-Protected Analog Signal
Range (Notes 4, 6)
V
AIN
-36 36Applies with power on
Applies with power off
E -200 200
nA
+25°C
Input Signal-Path Leakage
Current, Supplies On
I
AIN(ON)
-20 0.1 20
V
AIN
= ±25V, V
AOUT
= open
E -500 500
nA
+25°C
Input Signal-Path Leakage
Current, Supplies Off
I
AIN(OFF)
-20 0.2 20
V
AIN
= ±40V, V
AOUT
= open
V+ = 0, V- = 0
+25°C -26 -19 -13
mA
+25°C
Output Clamp Current,
Supplies On
I
AOUT
13 19 26V
AIN
= 25V
V
AIN
= -25V
+25°C 0.4 1.0
kΩ
+25°C
Output Clamp Resistance,
Supplies On
R
AOUT
0.5 1.0
I
AOUT
= 1mA
V
AIN
= 25V
V
AIN
= -25V
ns+25°C
±Fault Output Turn-On
Delay Time
10RL= 10kΩ, V
AIN
= ±25V
ANALOG SWITCH
FAULT PROTECTION
Note 1: The AOUT pin is not fault protected. Signals on AOUT exceeding V+ or V- are clamped by internal diodes. Limit forward
diode current to maximum current rating.
Note 2: The AIN pin is fault protected. Signals on AIN exceeding -36V to +36V may damage the device. These limits apply with
power applied to V+ or V-, or ±40V with V+ = V- = 0.
MAX4505
Fault-Protected, High-Voltage,
Signal-Line Protector
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—Single Supply
(V+ = +12V, V- = 0, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
Note 3: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 4: See Fault-Free Analog Signal Range vs. Supply Voltage graph in the
Typical Operating Characteristics
.
Note 5: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at T
A
= +25°C.
Note 6: Guaranteed by design.
Note 7: Guaranteed by testing with dual supplies.
Note 8: SOT packaged parts are 100% tested at +25°C. Limits at the maximum rated temperature are guaranteed by design and
correlation limits at +25°C. Leakage tests are typical for SOT packaged parts.
EPower-Supply Range V+, V- ±8 ±18 V
T
A
E
PARAMETER SYMBOL MIN TYP MAX UNITS
240
µA
CONDITIONS
+25°C
I+
45 150
V
AIN
= 15V
E
Fault-Free Analog Signal Range
(Note 4)
V
AIN
0V+VV
AIN
= 12V
E -20 20
nA
+25°C
T
A
E
Signal-Path Leakage Current
(Note 5)
I
AOUT(ON)
PARAMETER SYMBOL MIN TYP MAX UNITS
250
-0.5 0.05 0.5
V
AIN
= 10V or floating
Ω
Applies with power off
CONDITIONS
+25°C
Analog Signal-Path Resistance R
ON
125 200
E
V
AIN
= 10V, I
AOUT
= 1mA
E -40 40
E -200 200
V
E
Fault-Protected Analog Signal
Range (Notes 4, 6)
V
AIN
-36 36Applies with power on
µs+25°C
ns
nA
+25°C
+25°C
±Fault Output Turn-On
Delay Time
Input Signal-Path Leakage
Current, Supply On (Note 7)
10
I
AIN(ON)
-20 0.2 20
V
AIN
= ±25V, V
AOUT
= 0
-500 500
±Fault Recovery Time
RL= 10kΩ, V
AIN
= 25V
2.5
nA
+25°C
Input Signal-Path Leakage
Current, Supply Off (Note 7)
I
AIN(OFF)
RL= 10kΩ, V
AIN
= 25V
-20 0.2 20
V
AIN
= ±40V
mA+25°C
Output Clamp Current,
Supply On
I
AOUT
3 5.5 10V
AIN
= 25V
kΩ+25°C
Output Clamp Resistance,
Supply On
R
AOUT
1.0 2.5V
AIN
= ±25V
VEPower-Supply Range V+, V- +9 +36
µA
+25°C
Power-Supply Current I+
525
V
AIN
= 12V
E 40
+25°C±Fault Recovery Time 25 µsRL= 10kΩ, V
AIN
= ±25V
E -240
+25°C
Power-Supply Current
I-
-150 -45
V
AIN
= 15V
POWER SUPPLY
ANALOG SWITCH
FAULT PROTECTION
POWER SUPPLY
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