LTC2923 - Power Supply Tracking Controller


  • 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

Typical Application

LTC2923 Typical Application
LTC2923 Typical Application


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.


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
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

LTC2923 Package Drawing
LTC2923 Package Drawing

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
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
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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
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