LTC2923 - Power Supply Tracking Controller
Features
- Flexible Power Supply Tracking
- Tracks Both Up and Down
- Power Supply Sequencing
- Supply Stability is Not Affected
- Controls Two Supplies Without Series FETs
- Controls a Third Supply With a Series FET
- Adjustable Ramp Rates
- Electronic Circuit Breaker
- Available in 10-Lead MS and 12-Lead (4mm × 3mm) DFN Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC2923 provides a simple solution to power supply tracking and sequencing requirements. By selecting a few resistors, the supplies can be configured to ramp-up and ramp-down together or with voltage offsets, time delays or different ramp rates.
By introducing currents into the feedback nodes of two independent switching regulators, the LTC2923 causes their outputs to track without inserting any pass element losses. Because the currents are controlled in an openloop manner, the LTC2923 does not affect the transient response or stability of the supplies. Furthermore, it presents a high impedance when power-up is complete, effectively removing it from the DC/DC circuit.
For systems that require a third supply, one supply can be controlled with a series FET. This optional series FET can also control a supply that does not allow direct access to its feedback resistors (e.g., a power module) or a supply whose output cannot be forced to ground (e.g., a 3-terminal linear regulator). When the FET is used, an electronic circuit breaker provides protection from short-circuit conditions.
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 |
|---|---|---|---|---|---|
| LTC2923CDE#PBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LTC2923CDE#TRPBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LTC2923CMS#PBF | MS-10 | MS | C | 05-08-1661 | Yes |
| LTC2923CMS#TRPBF | MS-10 | MS | C | 05-08-1661 | Yes |
| LTC2923IDE#PBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LTC2923IDE#TRPBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LTC2923IMS#PBF | MS-10 | MS | I | 05-08-1661 | Yes |
| LTC2923IMS#TRPBF | MS-10 | MS | I | 05-08-1661 | 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 | |
|---|---|---|---|---|---|---|
| LTC2923CDE#PBF | 4x3 DFN-12 | C | $3.60 | $3.15 | Yes | |
| LTC2923CDE#TRPBF | 4x3 DFN-12 | C | $3.21 | Yes | ||
| LTC2923CMS#PBF | MS-10 | C | $3.90 | $2.95 | Yes | |
| LTC2923CMS#TRPBF | MS-10 | C | $3.01 | Yes | ||
| LTC2923IDE#PBF | 4x3 DFN-12 | I | $4.15 | $3.60 | Yes | |
| LTC2923IDE#TRPBF | 4x3 DFN-12 | I | $3.66 | Yes | ||
| LTC2923IMS#PBF | MS-10 | I | $4.50 | $3.40 | Yes | |
| LTC2923IMS#TRPBF | MS-10 | 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 |
|---|---|---|---|
| DC732A | LTC2923CMS10 | Power Supply Tracking and Sequencing Controller | $50.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC2923IMS#PBF | MS-10 | I | $4.50 | $3.40 | Yes | |
| LTC2923IMS#TRPBF | MS-10 | I | $3.46 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- VCORE and VI/O Supply Tracking
- Microprocessor, DSP and FPGA Supplies
- Servers
- Communication Systems
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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:
LTC2923
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.
