LTC2927 - Single Power Supply Tracking Controller

Features

  • Flexible Power Supply Tracking
  • Tracks Both Up and Down
  • Power Supply Sequencing
  • Supply Stability is Not Affected
  • Low Pin Count
  • Controls Single Supply without Series FETs
  • Adjustable Ramp Rate
  • Available in 8-Lead ThinSOT and 8-Lead (3mm × 2mm) DFN Packages

Typical Application

LTC2927 Typical Application
LTC2927 Typical Application

Description

The LTC2927 provides a simple solution to power supply tracking and sequencing requirements. By selecting a few resistors, the supply can be configured to ramp-up and ramp-down with differing ramp rates, voltage offsets, or time delays relative to other supplies or a master signal.

By forcing current into a feedback node of an independent supply, the LTC2927 causes the output to track a ramp signal without inserting any pass element losses. Because the current is controlled in an open-loop manner, the LTC2927 does not affect the transient response or stability of the supply. The compact solution at point of load minimizes the trace length of the DC/DC circuit sensitive FB node. Furthermore, it presents a high impedance when power-up is complete, effectively removing it from the DC/DC circuit.

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
LTC2927CDDB#PBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2927CDDB#TRMPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2927CDDB#TRPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2927CTS8#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2927CTS8#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2927CTS8#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2927IDDB#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2927IDDB#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2927IDDB#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2927ITS8#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2927ITS8#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2927ITS8#TRPBF SOT-23 TS8 I 05-08-1637 Yes


LTC2927 Package Drawing
LTC2927 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
LTC2927CDDB#PBF 3x2 DFN-8 C $2.30 Yes
LTC2927CDDB#TRMPBF 3x2 DFN-8 C $2.30 $1.63 Yes
LTC2927CDDB#TRPBF 3x2 DFN-8 C $2.30 $1.61 Yes
LTC2927CTS8#PBF SOT-23 C $2.30 Yes
LTC2927CTS8#TRMPBF SOT-23 C $2.30 $1.63 Yes
LTC2927CTS8#TRPBF SOT-23 C $2.30 $1.61 Yes
LTC2927IDDB#PBF 3x2 DFN-8 I $2.73 Yes
LTC2927IDDB#TRMPBF 3x2 DFN-8 I $2.73 $1.93 Yes
LTC2927IDDB#TRPBF 3x2 DFN-8 I $2.73 $1.91 Yes
LTC2927ITS8#PBF SOT-23 I $2.73 Yes
LTC2927ITS8#TRMPBF SOT-23 I $2.73 $1.93 Yes
LTC2927ITS8#TRPBF SOT-23 I $2.73 $1.91 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
DC817A LTC2927 | Single Pwr Supply Tracking Controller $50.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • VCORE and VI/O Supply Tracking
  • Microprocessor, DSP and FPGA Supplies
  • Multiple Supply Systems
  • Point-of-Load Supplies

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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:
LTC2927

Technical Support