LTC1645 - Dual-Channel Hot Swap Controller/Power Sequencer
Features
- Allows Safe Board Insertion and Removal from a Live Backplane
- Programmable Power Supply Sequencing
- Programmable Electronic Circuit Breaker
- User-Programmable Supply Voltage Power-Up and Power-Down Rate
- High Side Drivers for External N-Channel FETs
- Controls Supply Voltages from 1.2V to 12V
- Ensures Proper Power-Up Behavior
- Undervoltage Lockout
- Glitch Filter Protects Against Spurious RESET Signals
- 8- and 14-Pin SO Packages
Typical Application
Description
The LTC®1645 is a 2-channel Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. Using external N-channel pass transistors, the supply voltages can be ramped at a programmable rate. Two high side switch drivers control the N-channel gates for supply voltages ranging from 1.2V to 12V. The two channels can be set to ramp up and down separately, or they can be programmed to rise and fall simultaneously, ensuring power supply tracking at the two outputs.
Programmable electronic circuit breakers protect against shorts at either output. The RESET output can be used to generate a system reset when a supply voltage falls below a user-programmed voltage. An additional spare comparator is available for monitoring a second supply voltage.
The LTC1645 is available in the 8- and 14-pin SO packages.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1645CS#PBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1645CS#TRPBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1645CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1645CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1645IS#PBF | SO-14 | S | I | 05-08-1610 (S14) | Yes |
| LTC1645IS#TRPBF | SO-14 | S | I | 05-08-1610 (S14) | Yes |
| LTC1645IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1645IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1645CS#PBF | SO-14 | C | $3.95 | $3.30 | Yes | |
| LTC1645CS#TRPBF | SO-14 | C | $3.36 | Yes | ||
| LTC1645CS8#PBF | SO-8 | C | $3.50 | $2.95 | Yes | |
| LTC1645CS8#TRPBF | SO-8 | C | $3.01 | Yes | ||
| LTC1645IS#PBF | SO-14 | I | $4.50 | $3.80 | Yes | |
| LTC1645IS#TRPBF | SO-14 | I | $3.86 | Yes | ||
| LTC1645IS8#PBF | SO-8 | I | $4.00 | $3.40 | Yes | |
| LTC1645IS8#TRPBF | SO-8 | I | $3.46 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
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 |
|---|---|---|---|
| DC1356A | LTC1645CS8 Demoboard | 2-Supply Hot Swap Controller and Sequencer [5V/5A, 3.3V/7A] | $50.00 | |
| Buy Now | |||
Applications
- Hot Board Insertion
- Power Supply Sequencing
- Electronic Circuit Breaker
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC1645
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
