DocumentationDatasheet
Reliability Data
Product Selector Card
LT Journal
cad_symbol
Features
- 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
Typical Application
Description
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.
SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1641-1CS8#PBF | SO | 8 | C | $2.75 | $2.35 |
| LT1641-1CS8#TRPBF | SO | 8 | C | $2.41 | |
| LT1641-1IS8#PBF | SO | 8 | I | $3.00 | $2.60 |
| LT1641-1IS8#TRPBF | SO | 8 | I | $2.66 | |
| LT1641-2CS8#PBF | SO | 8 | C | $2.75 | $2.35 |
| LT1641-2CS8#TRPBF | SO | 8 | C | $2.41 | |
| LT1641-2IS8#PBF | SO | 8 | I | $3.00 | $2.60 |
| LT1641-2IS8#TRPBF | SO | 8 | I | $2.66 | |
| LT1641CS8#PBF | SO | 8 | C | $2.75 | $2.35 |
| LT1641CS8#TRPBF | SO | 8 | C | $2.41 | |
| LT1641IS8#PBF | SO | 8 | I | $3.00 | $2.60 |
| LT1641IS8#TRPBF | SO | 8 | I | $2.66 | |
| LT1641CS8 | SO | 8 | C | $5.50 | $4.70 |
| LT1641CS8#TR | SO | 8 | C | $4.82 | |
| LT1641IS8 | SO | 8 | I | $6.00 | $5.20 |
| LT1641IS8#TR | SO | 8 | I | $5.32 | |
| LT1641-1CS8 | SO | 8 | C | $5.50 | $4.70 |
| LT1641-1CS8#TR | SO | 8 | C | $4.82 | |
| LT1641-1IS8 | SO | 8 | I | $6.00 | $5.20 |
| LT1641-1IS8#TR | SO | 8 | I | $5.32 | |
| LT1641-2CS8 | SO | 8 | C | $5.50 | $4.70 |
| LT1641-2CS8#TR | SO | 8 | C | $4.82 | |
| LT1641-2IS8 | SO | 8 | I | $6.00 | $5.20 |
| LT1641-2IS8#TR | SO | 8 | I | $5.32 |
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.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1354A-C | LT1641-1 | Positive High Voltage Hot Swap Controllers with Latch-off (-1) | $50.00 | |
| DC1354A-D | LT1641-2 | Positive High Voltage Hot Swap Controllers with Auto-Retry(-2) | $50.00 |