Features and Benefits
- Allows Safe Board Insertion and Removal from a Live Backplane
- Controls Supply Voltage from 9V to 80V
- Programmable Analog Foldback Current Limiting
- High Side Drive for an External N-Channel
- Latched Operation Mode (LT1641-1)
- Automatic Retry (LT1641-2)
- User Programmable Supply Voltage Power-Up Rate
- Undervoltage Lockout
- Overvoltage Protection
- Both are available in 8-Lead SO Package
The LT1641-1/LT1641-2 are 8-pin Hot Swap™ controllers that allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped up at a programmable rate. A high side switch driver controls an N-channel gate for supply voltages ranging from 9V to 80V.
The chips feature a programmable analog foldback current limit circuit. If the chips remain in current limit for more than a programmable time, the N-channel pass transistor is either latched off (LT1641-1) or is set to automatically restart after a time-out delay (LT1641-2).
The PWRGD output indicates when the output voltage, sensed by the FB pin, is within tolerance. The ON pin provides programmable undervoltage lockout.
The LT1641-1/LT1641-2 are available in the 8-lead SO package.
- Hot Board Insertion
- Electronic Circuit Breaker
- Industrial High Side Switch/Circuit Breaker
- 24V/48V Industrial/Alarm Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
Demonstration circuit 1354B is a positive high voltage hot swap controller featuring either the LT®1641-1, LT1641-2, LT4256-1, or LT4256-2.
The board facilitates measurement of transient conditions, steady state operation with different loads, and fault conditions. The Controller responds to fault conditions such as input undervoltage(UV), output power good (PWRGD) fault, and overcurrent and response can be verified by the output voltage (VOUT) LED state and PWRGD pin signal. The LT1641-1 and LT4256-1 latch off if MOSFET shuts off under overcurrent condition, while LT1641-2 and LT4256-2 automatically restart after time-out delay.
The DC1354B contains one hot swap controller, power MOSFET, current sense resistor, enable circuit, input voltage clamp, gate protection circuit, resistive output voltage divider for feedback signal, and three LEDs to indicate the presence of input and output voltages and power good condition.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LT1641-1 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.