LTC4221 - Dual Hot Swap Controller/Power Sequencer with Dual Speed, Dual Level Fault Protection
Features
- Allows Safe Board Insertion and Removal from a Live Backplane
- Configurable Power Supply Sequencing
- Soft-Start with Current Foldback Limits Inrush Current
- No External Gate Capacitor Required
- Adjustable Dual Level Circuit Breaker Protection
- Controls Supply Voltages from 1V to 13.5V
- Independent N-Channel MOSFET High Side Drivers
- FB Pin Monitors VOUT for Overvoltage Protection
- Latch Off or Automatic Retry on Current Fault
- FAULT and PWRGD Outputs
- Narrow 16-Pin SSOP Package
Typical Application
Description
The LTC4221 is a 2-channel Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. Using two independent high side gate drivers to control two external N-channel pass transistors, the output voltages can be ramped up with current foldback to limit the inrush current during the start-up period. No external compensation capacitors are required at the GATE pins. The two channels can be configured to ramp up and down separately or simultaneously for supply voltages ranging from 2.7V to 13.5V and 1V to 13.5V for channels 1 and 2 respectively.
Each channel has two current limit comparators that provide dual level and dual speed overcurrent circuit breaker protection after the start-up period. If any current sense voltage exceeds 100mV for 1µs or 25mV for the timeout delay (set by the CFILTER at the FILTER pin), then the FAULT latch is set and both GATE pins are pulled low.
The FB pins monitor the respective channel output voltages and provide the inputs for the PWRGD comparators as well as overvoltage protection.
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 |
|---|---|---|---|---|---|
| LTC4221CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC4221CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC4221IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC4221IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC4221CGN#PBF | SSOP-16 | C | $4.05 | $3.10 | Yes | |
| LTC4221CGN#TRPBF | SSOP-16 | C | $3.16 | Yes | ||
| LTC4221IGN#PBF | SSOP-16 | I | $4.95 | $3.70 | Yes | |
| LTC4221IGN#TRPBF | SSOP-16 | I | $3.76 | 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 |
|---|---|---|---|
| DC1355A | LTC4221 Dual Hot Swap Controller | $50.00 | |
| Buy Now | |||
Applications
- Electronic Circuit Breaker
- Power Supply Sequencing
- Live Board Insertion and Removal
- Industrial High Side Switch/Circuit Breaker
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LTC4221
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.
