LT1640A - Negative Voltage Hot Swap Controller
Datasheet 
DocumentationDatasheet
Reliability Data
Product Selector Card
LT Journal
cad_symbol
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
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.
,N-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1640AHCN8#PBF | PDIP | 8 | C | $2.25 | $1.90 |
| LT1640AHCS8#PBF | SO | 8 | C | $2.30 | $1.95 |
| LT1640AHCS8#TRPBF | SO | 8 | C | $2.01 | |
| LT1640AHIN8#PBF | PDIP | 8 | I | $2.50 | $2.15 |
| LT1640AHIS8#PBF | SO | 8 | I | $2.55 | $2.20 |
| LT1640AHIS8#TRPBF | SO | 8 | I | $2.26 | |
| LT1640ALCN8#PBF | PDIP | 8 | C | $2.25 | $1.90 |
| LT1640ALCS8#PBF | SO | 8 | C | $2.30 | $1.95 |
| LT1640ALCS8#TRPBF | SO | 8 | C | $2.01 | |
| LT1640ALIN8#PBF | PDIP | 8 | I | $2.50 | $2.15 |
| LT1640ALIS8#PBF | SO | 8 | I | $2.55 | $2.20 |
| LT1640ALIS8#TRPBF | SO | 8 | I | $2.26 | |
| LT1640HCN8#PBF | PDIP | 8 | C | $2.25 | $1.90 |
| LT1640HCS8#PBF | SO | 8 | C | $2.30 | $1.95 |
| LT1640HCS8#TRPBF | SO | 8 | C | $2.01 | |
| LT1640HIN8#PBF | PDIP | 8 | I | $2.50 | $2.15 |
| LT1640HIS8#PBF | SO | 8 | I | $2.55 | $2.20 |
| LT1640HIS8#TRPBF | SO | 8 | I | $2.26 | |
| LT1640LCN8#PBF | PDIP | 8 | C | $2.25 | $1.90 |
| LT1640LCS8#PBF | SO | 8 | C | $2.30 | $1.95 |
| LT1640LCS8#TRPBF | SO | 8 | C | $2.01 | |
| LT1640LIN8#PBF | PDIP | 8 | I | $2.50 | $2.15 |
| LT1640LIS8#PBF | SO | 8 | I | $2.55 | $2.20 |
| LT1640LIS8#TRPBF | SO | 8 | I | $2.26 | |
| LT1640HCN8 | PDIP | 8 | C | $4.50 | $3.80 |
| LT1640HCS8 | SO | 8 | C | $4.60 | $3.90 |
| LT1640HCS8#TR | SO | 8 | C | $4.02 | |
| LT1640HIN8 | PDIP | 8 | I | $5.00 | $4.30 |
| LT1640HIS8 | SO | 8 | I | $5.10 | $4.40 |
| LT1640HIS8#TR | SO | 8 | I | $4.52 | |
| LT1640LCN8 | PDIP | 8 | C | $4.50 | $3.80 |
| LT1640LCS8 | SO | 8 | C | $4.60 | $3.90 |
| LT1640LCS8#TR | SO | 8 | C | $4.02 | |
| LT1640LIN8 | PDIP | 8 | I | $5.00 | $4.30 |
| LT1640LIS8 | SO | 8 | I | $5.10 | $4.40 |
| LT1640LIS8#TR | SO | 8 | I | $4.52 | |
| LT1640AHCN8 | PDIP | 8 | C | $4.50 | $3.80 |
| LT1640AHCS8 | SO | 8 | C | $4.60 | $3.90 |
| LT1640AHCS8#TR | SO | 8 | C | $4.02 | |
| LT1640AHIN8 | PDIP | 8 | I | $5.00 | $4.30 |
| LT1640AHIS8 | SO | 8 | I | $5.10 | $4.40 |
| LT1640AHIS8#TR | SO | 8 | I | $4.52 | |
| LT1640ALCN8 | PDIP | 8 | C | $4.50 | $3.80 |
| LT1640ALCS8 | SO | 8 | C | $4.60 | $3.90 |
| LT1640ALCS8#TR | SO | 8 | C | $4.02 | |
| LT1640ALIN8 | PDIP | 8 | I | $5.00 | $4.30 |
| LT1640ALIS8 | SO | 8 | I | $5.10 | $4.40 |
| LT1640ALIS8#TR | SO | 8 | I | $4.52 |
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.