LTC2925 - Multiple Power Supply Tracking Controller with Power Good Timeout

Features

  • Flexible Power Supply Tracking Up and Down
  • Power Supply Sequencing
  • Supply Stability Is Not Affected
  • Controls Three Supplies Without Series FETs
  • Controls an Optional Fourth Supply with a Series FET
  • Electronic Circuit Breaker
  • Remote Sense Switch Compensates for Voltage Drop Across a Series FET
  • Supply Shutdown Outputs
  • FAULT Output
  • Adjustable Power Good Timeout
  • Available in Narrow 24-Lead SSOP and Tiny 24-Lead QFN Packages

Typical Application

LTC2925 Typical Application
LTC2925 Typical Application
LTC2925 Typical Application

Description

The LTC2925 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.

The LTC2925 controls the outputs of three independent supplies without inserting any pass element losses. For systems that require a fourth supply, or when a supply does not allow direct access to its feedback resistors, one supply can be controlled with a series FET. When the FET is used, an internal remote sense switch compensates for the voltage drop across the FET and current sense resistor, and an electronic circuit breaker provides protection from short-circuit conditions.

The LTC2925 also includes a power good timeout feature that turns off the supplies if an external supply monitor fails to indicate that the supplies have entered regulation within an adjustable time-out period.

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
LTC2925CGN#PBF SSOP-24 GN C 05-08-1641 (GN24) Yes
LTC2925CGN#TRPBF SSOP-24 GN C 05-08-1641 (GN24) Yes
LTC2925CUF#PBF 4x4 QFN-24 UF C 05-08-1697 Yes
LTC2925CUF#TRPBF 4x4 QFN-24 UF C 05-08-1697 Yes
LTC2925IGN#PBF SSOP-24 GN I 05-08-1641 (GN24) Yes
LTC2925IGN#TRPBF SSOP-24 GN I 05-08-1641 (GN24) Yes
LTC2925IUF#PBF 4x4 QFN-24 UF I 05-08-1697 Yes
LTC2925IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 Yes


LTC2925 Package Drawing
LTC2925 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
(1-99)
Price
(1k)*
RoHS
LTC2925CGN#PBF SSOP-24 C $5.36 $3.75 Yes
LTC2925CGN#TRPBF SSOP-24 C $3.85 Yes
LTC2925CUF#PBF 4x4 QFN-24 C $5.63 $3.95 Yes
LTC2925CUF#TRPBF 4x4 QFN-24 C $4.05 Yes
LTC2925IGN#PBF SSOP-24 I $6.07 $4.30 Yes
LTC2925IGN#TRPBF SSOP-24 I $4.40 Yes
LTC2925IUF#PBF 4x4 QFN-24 I $6.43 $4.50 Yes
LTC2925IUF#TRPBF 4x4 QFN-24 I $4.60 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.

Click here to view our complete list of demo boards

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:
LTC2925

Technical Support