DocumentationDatasheet
Design Note
Reliability Data
Product Selector Card
cad_symbol
Features
- Allows Safe Board Insertion and Removal from a Live Backplane
- System Reset and Power Good Control Outputs
- Programmable Electronic Circuit Breaker
- User Programmable Supply Voltage Power-Up Rate
- High Side Driver for Two External N-Channels
- Controls Supply Voltages from 3V to 12V
- Connection Inputs Detect Board Insertion or Removal
- Undervoltage Lockout
- Power-On Reset Input
Typical Application
Description
The LTC1421/LTC1421-2.5 are Hot Swap™ controllers that allow a board to be safely inserted and removed from a live backplane. Using external N-channel pass transistors, the board supply voltages can be ramped up at a programmable rate. Two high side switch drivers control the N-channel gates for supply voltages ranging from 3V to 12V.A programmable electronic circuit breaker protects agianst shorts. Warning signals indicate that the circuit breaker has tripped, a power failure has occurred or that the switch drivers are turned off. The reset output can be used to generate a system reset when the power cycles or a fault occurs. The two connect inputs can be used with staggered connector pins to indicate board insertion or removal. The power-on reset input can be used to cycle the board power or claer the circuit breaker.
The trip point of the ground sense comparator is set at 0.1V for LTC1421 and 2.5V for LTC1421-2.5.
The LTC1421/LTC1421-2.5 are available in 24-pin SO and SSOP packages.
SSOP-24,SW-24,
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1421CG#PBF | SSOP | 24 | C | $6.90 | $5.20 |
| LTC1421CG#TRPBF | SSOP | 24 | C | $5.30 | |
| LTC1421CG-2.5#PBF | SSOP | 24 | C | $6.90 | $5.20 |
| LTC1421CG-2.5#TRPBF | SSOP | 24 | C | $5.30 | |
| LTC1421CSW#PBF | SO | 24 | C | $6.40 | $4.90 |
| LTC1421CSW#TRPBF | SO | 24 | C | $5.00 | |
| LTC1421CSW-2.5#PBF | SO | 24 | C | $6.40 | $4.90 |
| LTC1421CSW-2.5#TRPBF | SO | 24 | C | $5.00 | |
| LTC1421IG#PBF | SSOP | 24 | I | $7.15 | $5.95 |
| LTC1421IG#TRPBF | SSOP | 24 | I | $6.05 | |
| LTC1421IG-2.5#PBF | SSOP | 24 | I | $7.15 | $5.95 |
| LTC1421IG-2.5#TRPBF | SSOP | 24 | I | $6.05 | |
| LTC1421ISW#PBF | SO | 24 | I | $6.60 | $5.65 |
| LTC1421ISW#TRPBF | SO | 24 | I | $5.75 | |
| LTC1421ISW-2.5#PBF | SO | 24 | I | $6.60 | $5.65 |
| LTC1421ISW-2.5#TRPBF | SO | 24 | I | $5.75 | |
| LTC1421CG | SSOP | 24 | C | $13.80 | $10.40 |
| LTC1421CG#TR | SSOP | 24 | C | $10.60 | |
| LTC1421CG-2.5 | SSOP | 24 | C | $13.80 | $10.40 |
| LTC1421CG-2.5#TR | SSOP | 24 | C | $10.60 | |
| LTC1421CSW | SO | 24 | C | $12.80 | $9.80 |
| LTC1421CSW#TR | SO | 24 | C | $10.00 | |
| LTC1421CSW-2.5 | SO | 24 | C | $12.80 | $9.80 |
| LTC1421CSW-2.5#TR | SO | 24 | C | $10.00 | |
| LTC1421IG | SSOP | 24 | I | $14.30 | $11.90 |
| LTC1421IG#TR | SSOP | 24 | I | $12.10 | |
| LTC1421IG-2.5 | SSOP | 24 | I | $14.30 | $11.90 |
| LTC1421IG-2.5#TR | SSOP | 24 | I | $12.10 | |
| LTC1421ISW | SO | 24 | I | $13.20 | $11.30 |
| LTC1421ISW#TR | SO | 24 | I | $11.50 | |
| LTC1421ISW-2.5 | SO | 24 | I | $13.20 | $11.30 |
| LTC1421ISW-2.5#TR | SO | 24 | I | $11.50 |
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 |
|---|---|---|---|
| DC116A-A | LTC1421CSW Demo Board: Two Positive and One Negative Supply Hot Swap Board (also see DC116A-B) | $25.00 |
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC116A-B | System Backplane Demo Board for DC116A-A (LTC1421 Demo Board) | $25.00 |