Single Channel Protector in a SOT-23 Package and a MSOP Package Data Sheet ADG465 FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD SS Fault and overvoltage protection up to 40 V Signal paths open circuit with power off V V D1 S1 Signal path resistance of R with power on V V ON IN OUT Supply maximum ratings (V to V ): 44 V ADG465 DD SS V V IN OUT Low on resistance (R ): 80 t ypical ON V DD 1 nA maximum path current leakage at 25C V DD Low power dissipation: 0.8 W typical Latch-up proof construction OUTPUT CLAMPED AT V 1.5V DD APPLICATIONS Figure 1. ATE equipment Sensitive measurement equipment Hot insertion rack systems ADC input channel protection GENERAL DESCRIPTION The ADG465 is a single channel protector that comes in SOT-23 The ADG465 can operate from both bipolar and unipolar supplies. and MSOP packages. The channel protector is in series with the The channels are normally on when power is connected, and signal path and protects sensitive components from voltage open circuit when power is disconnected. With power supplies of transience in the signal path whether or not the power supplies 15 V, the on resistance of the ADG465 is 80 typ ical, with a are present. Because the channel protection works regardless of leakage current of 1 nA maximum. When power is disconnected, the presence of the supplies, the channel protectors are ideal for the input leakage current is approximately 0.005 A typical. use in applications where correct power sequencing cannot The ADG465 is available in a 6-lead SOT-23 package, and an always be guaranteed to protect the analog inputs (for example, hot 8-lead MSOP package. insertion rack systems). See the Applications Information section PRODUCT HIGHLIGHTS for further details. 1. Fault Protection. A channel protector consists of an N channel, metal-oxide The ADG465 can withstand continuous voltage inputs from semiconductor field-effect transistor (MOSFET), a P channel 40 V to +40 V. When a fault occurs due to the power supplies MOSFET, and another N channel MOSFET connected in series. being turned off, or due to an overvoltage being applied to The channel protector behaves like a series resistor during normal the ADG465, the output is clamped. When power is turned operation, that is, (V + 1.5 V) < V < (V 1.5 V). When the SS IN DD off, current is limited to the nanoampere level. analog input of a channel exceeds the power supplies (including 2. Low Power Dissipation. VDD and VSS = 0 V), one of the MOSFETs switches off, clamping 3. Low R 80 typical. ON the output to either VSS + 1.5 V or VDD 1.5 V. Circuitry and 4. Trench Isolation Latch-Up Proof Construction. signal source protection are provided in the event of an overvoltage A dielectric trench separates the P channel and the or power loss. The channel protectors can withstand overvoltage N channel MOSFETs thereby preventing latch up. inputs from 40 V to +40 V. See the Theory of Operation section for further details. Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 19972018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 09538-001ADG465 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications ....................................................................................... 1 Test Circuits ........................................................................................8 Functional Block Diagram .............................................................. 1 Theory of Operation .........................................................................9 General Description ......................................................................... 1 Overvoltage Protection .................................................................9 Product Highlights ........................................................................... 1 Trench Isolation .......................................................................... 10 Revision History ............................................................................... 2 Applications Information .............................................................. 11 Specifications ..................................................................................... 3 Overvoltage and Power Supply Sequencing Protection ............ 11 Dual Supply ................................................................................... 3 High Voltage Surge Suppression .............................................. 11 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ....................................................................... 12 Thermal Resistance ...................................................................... 4 Ordering Guide .......................................................................... 12 ESD Caution .................................................................................. 4 Pin Configurations and Function Descriptions ........................... 5 REVISION HISTORY 8/2018Rev. B to Rev. C Added Figure 10 ................................................................................ 7 Changes to VS, VD, Analog Input Overvoltage with Power Off Added Test Circuits Section and Figure 11 to Figure 13 .............. 8 Parameter, Table 2 ............................................................................. 4 Changed Circuit Information Section to Theory of Operation Change to High Voltage Surge Suppression Section ................. 11 Section .................................................................................................9 Changes to Figure 16 ......................................................................... 9 12/2017Rev. A to Rev. B Changes to Overvoltage Protection ............................................. 10 Updated Format .................................................................. Universal Changes to Overvoltage and Power Supply Sequencing Protection Changes to Product Title and General Description Section ....... 1 Section .............................................................................................. 11 Changes to Table 1 ............................................................................ 3 Updated Outline Dimensions ....................................................... 12 Added Thermal Resistance Section and Table 3 Renumbered Changes to Ordering Guide .......................................................... 12 Sequentially ....................................................................................... 4 Changes to Figure 2, Figure 3, and Table 4 ................................... 5 1/1997Revision 0: Initial Version Changes to Figure 4 to Figure 8 ...................................................... 6 Added Figure 9 Renumbered Sequentially .................................. 6 Rev. C Page 2 of 12