Monitor, Control and Protection Hot Swap Controllers High Voltage Hot Swap Controllers

LT4250 - Negative 48V Hot Swap Controller

LT1640A - Negative Voltage Hot Swap Controller

Features

  • Allows Safe Board Insertion and Removal from a Live -48V Backplane
  • Operates from -10V to -80V
  • Programmable Inrush Current
  • Allows 50mA of Reverse Drain Pin Current
  • Programmable Electronic Circuit Breaker
  • Programmable Overvoltage Protection
  • Programmable Undervoltage Lockout
  • Power Good Control Output

Typical Application

LT1640A Typical Application
LT1640A Typical Application

Description

The LT1640AL/LT1640AH are 8-pin, negative voltage Hot Swap controllers that allow a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable electronic circuit breaker protects the system against shorts. The PWRGD (LT1640AL) or PWRGD (LT1640AH) signal can be used to directly enable a power module. The LT1640AL is designed for modules with a low enable input and the LT1640AH for modules with a high enable input.

The LT1640AL/LT1640AH are available in 8-pin PDIP and SO packages.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LT1640AHCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1640AHCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1640AHCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1640AHIN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1640AHIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1640AHIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1640ALCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1640ALCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1640ALCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1640ALIN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1640ALIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1640ALIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1640A Package Drawing
LT1640A Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LT1640AHCN8#PBF N-8 C $2.25 $1.90 Yes
LT1640AHCS8#PBF SO-8 C $2.30 $1.95 Yes
LT1640AHCS8#TRPBF SO-8 C $2.01 Yes
LT1640AHIN8#PBF N-8 I $2.50 $2.15 Yes
LT1640AHIS8#PBF SO-8 I $2.55 $2.20 Yes
LT1640AHIS8#TRPBF SO-8 I $2.26 Yes
LT1640ALCN8#PBF N-8 C $2.25 $1.90 Yes
LT1640ALCS8#PBF SO-8 C $2.30 $1.95 Yes
LT1640ALCS8#TRPBF SO-8 C $2.01 Yes
LT1640ALIN8#PBF N-8 I $2.50 $2.15 Yes
LT1640ALIS8#PBF SO-8 I $2.55 $2.20 Yes
LT1640ALIS8#TRPBF SO-8 I $2.26 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Central Office Switching
  • -48V Distributed Power Systems
  • Negative Power Supply Control

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