LTC1421ISW-2.5#TRPBF

Hot Swap Controllers Overview

The LTC1421ISW-2.5#TRPBF is a hot swap controller manufactured by Analog Devices Inc., designed for safe board insertion and removal from live backplane systems. It operates within a supply voltage range of 3V to 12V and utilizes external N-channel pass transistors to ramp up board supply voltages at a programmable rate. The device features a fixed 2.5V threshold for its programmable electronic circuit breaker, which protects against overcurrent conditions. Integrated high-side switch drivers control the gates of two external N-channel MOSFETs. Additional functionalities include system reset and power good control outputs, undervoltage lockout, and connection inputs that detect board insertion or removal events.

Hot Swap Controllers Feature Summary

• Enables safe insertion and removal of boards from live backplanes using external N-channel pass transistors with programmable voltage ramp rates.
• Provides protection via a programmable electronic circuit breaker with a fixed 2.5V threshold and includes system reset and power good control outputs.
• Detects board insertion or removal through dedicated connection inputs and incorporates undervoltage lockout for reliable operation.

Hot Swap Controllers Applications

• PCI slot hot-swappable implementations
• Peripheral insertion or removal in live systems
• Backplane board insertion and removal

Hot Swap Controllers Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm the ISW variant meets industrial temperature specifications required for the application. Ensure the fixed 2.5V circuit breaker threshold aligns with the external sense resistor selection for the target current limit. Cross-reference the datasheet for the SSOP-24 package dimensions to validate PCB footprint compatibility before finalizing procurement.

Hot Swap Controllers Selection Notes

Select this component when a fixed 2.5V overcurrent trip point is suitable for the design, eliminating the need for external programming resistors for the breaker threshold. It is appropriate for systems requiring control of supply voltages between 3V and 12V. Consider the SSOP-24 package size relative to available board space. Verify that the external N-channel MOSFETs selected can handle the expected load currents and voltage ratings supported by the controller's high-side drivers.

Hot Swap Controllers Part Context

This part belongs to the LTC1421 family of hot swap controllers from Analog Devices. It shares core functionality with variants like the LTC1421IG-2.5#PBF but differs in package type and manufacturing lot specifications. The family is designed to manage power sequencing and protection during hot insertion events, ensuring system integrity while peripherals are added or removed without shutting down the main power supply.

Hot Swap Controllers Replacement Considerations

LTC1421IG-2.5#PBF offers identical electrical characteristics and the same 2.5V fixed threshold but uses an SSOP-24 tube package instead of tape-and-reel. Substitution requires verifying that the reel packaging does not impact the assembly process and that the pinout remains compatible with the existing PCB layout.