LTC2921 - Power Supply Tracker with Input Monitors
Features
- Tracks Multiple Supplies with MOSFET Switches
- Monitors 5 Input Voltages Including VCC
- Guaranteed Threshold Accuracy: ±1% at 0.5V
- Automatic Remote Sense Switching
- Adjustable Supply Ramp Rate
- Overvoltage Monitor
- Adjustable Electronic Circuit Breaker
- Adjustable Power-Good Delay
- Available for VCC Supply Voltages of 5V, 3.3V and 2.5V
- Available in 16-Pin Narrow SSOP (LTC2921 Series) and 20-Pin TSSOP (LTC2922 Series)
Typical Application
Description
The LTC®2921 and LTC2922 monitor up to five supplies and force them to track on power-up in multiple supply systems. Using external N-channel pass transistors, the supplies can be ramped up at an adjustable rate. Automatic remote sense switching allows the DC/DC converters to compensate for series voltage drops in the wiring. An incorrect level on one or more of the supplies triggers disconnect of all supplies. Tight 1% accuracy and glitch immunity on the low 0.5V monitoring level ensure no false error disconnects.
The LTC2921 and LTC2922 each feature an adjustable electronic circuit breaker to protect the VCC supply against short circuits. Capacitance at the TIMER pin programs the delays in the monitoring sequence.
The LTC2921 includes three remote sense switches in a 16-pin narrow SSOP package, while the LTC2922 includes five remote sense switches in a 20-pin TSSOP package. Both parts are available for VCC supply voltages of 5V, 3.3V, and 2.5V.
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 |
|---|---|---|---|---|---|
| LTC2921CGN-2.5#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2921CGN-2.5#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2921CGN-3.3#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2921CGN-3.3#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2921CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2921CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2921IGN-2.5#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2921IGN-2.5#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2921IGN-3.3#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2921IGN-3.3#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2921IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2921IGN#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 | |
|---|---|---|---|---|---|---|
| LTC2921CGN-2.5#PBF | SSOP-16 | C | $4.20 | $3.15 | Yes | |
| LTC2921CGN-2.5#TRPBF | SSOP-16 | C | $3.21 | Yes | ||
| LTC2921CGN-3.3#PBF | SSOP-16 | C | $4.20 | $3.15 | Yes | |
| LTC2921CGN-3.3#TRPBF | SSOP-16 | C | $3.21 | Yes | ||
| LTC2921CGN#PBF | SSOP-16 | C | $4.20 | $3.15 | Yes | |
| LTC2921CGN#TRPBF | SSOP-16 | C | $3.21 | Yes | ||
| LTC2921IGN-2.5#PBF | SSOP-16 | I | $4.85 | $3.65 | Yes | |
| LTC2921IGN-2.5#TRPBF | SSOP-16 | I | $3.71 | Yes | ||
| LTC2921IGN-3.3#PBF | SSOP-16 | I | $4.85 | $3.65 | Yes | |
| LTC2921IGN-3.3#TRPBF | SSOP-16 | I | $3.71 | Yes | ||
| LTC2921IGN#PBF | SSOP-16 | I | $4.85 | $3.65 | Yes | |
| LTC2921IGN#TRPBF | SSOP-16 | I | $3.71 | 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.Click here to view our complete list of demo boards
Applications
- Desktop Computers
- Plug-In Cards
- Telecom Infrastructure
- Supply Sequencing
- Instruments
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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:
LTC2921
LTC2921-2.5
LTC2921-3.3
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.
