Key facts
- Brand
- Linear Technology
- Model
- LT1640AL
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-09
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Linear Technology LT1640AL/LT1640AH Negative Voltage Hot Swap Controller Handbook
The LT1640AL and LT1640AH are 8‑pin negative‑voltage hot‑swap controllers that enable safe insertion and removal of boards from a live –48 V backplane. They limit inrush current, protect against over‑ and under‑voltage conditions, and provide a programmable electronic circuit breaker.
The handbook details the device features, electrical characteristics, pin functions, typical application circuits, timing diagrams, and package dimensions, giving designers the information needed to integrate the controller into power‑sequencing designs.
Linear Technology LT1640AL specifications
| Supply Current | 1.3 mA to 5 mA |
|---|---|
| Power Good Threshold | 14 V (typical) |
| Drain Input Bias Current | 10 pA to 500 pA |
| PWRGD Output Low Voltage (LT1640AL) | 0.48 V to 0.8 V |
Source: Linear Technology LT1640AL/LT1640AH Negative Voltage Hot Swap Controller Handbook
All Linear Technology LT1640AL documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What does the OV pin do?
The OV pin is the analog over‑voltage input; when it exceeds the 1.223 V low‑to‑high threshold it pulls the GATE pin low to protect the circuit.
How is the inrush current limited?
Inrush current is limited by programming the gate voltage of an external N‑channel pass transistor, which controls the current when the board is inserted into a live backplane.
What is the difference between the LT1640AL and LT1640AH?
The LT1640AL is designed for modules with a low enable input, while the LT1640AH is designed for modules with a high enable input.
From: Linear Technology LT1640AL/LT1640AH Negative Voltage Hot Swap Controller Handbook
How does the controller limit inrush current?
Inrush current is limited by programming a value that controls the gate voltage of an external N‑channel pass transistor.
From: Linear Technology LT1640AL/LT1640AH Negative Voltage Hot Swap Controller Handbook