Features and Benefits
- 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
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.
- VCORE and VI/O Supply Tracking
- Microprocessor, DSP and FPGA Supplies
- Communication Systems
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
R413 Reliability Data3/26/2018
DC732A - Demo Manual9/24/2009
Dual 500mA µPower LDO Features Independent 1.8V–20V Inputs and Easy Sequencing in a 4mm × 3mm DFN4/1/2010 LT Journal
MOSFETs Make Sense for Tracking and Sequencing Power Supplies3/1/2006 LT Journal
Power Supply Tracking for Linear Regulators11/1/2004 LT Journal
Versatile Power Supply Tracking without MOSFETs2/1/2004 LT Journal
Low Voltage Wizardry Provides the Ultimate Power-On Reset Circuit12/1/2003 LT Journal
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC2923 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC2923CDE#PBF||Material Declaration||Reliability Data||12-Lead DFN (4mm x 3mm w/ EP)|
|LTC2923CDE#TRPBF||Material Declaration||Reliability Data||12-Lead DFN (4mm x 3mm w/ EP)|
|LTC2923CMS#PBF||Material Declaration||Reliability Data||10-Lead MSOP|
|LTC2923CMS#TRPBF||Material Declaration||Reliability Data||10-Lead MSOP|
|LTC2923IDE#PBF||Material Declaration||Reliability Data||12-Lead DFN (4mm x 3mm w/ EP)|
|LTC2923IDE#TRPBF||Material Declaration||Reliability Data||12-Lead DFN (4mm x 3mm w/ EP)|
|LTC2923IMS#PBF||Material Declaration||Reliability Data||10-Lead MSOP|
|LTC2923IMS#TRPBF||Material Declaration||Reliability Data||10-Lead MSOP|
|Wafer Fabrication Data||R413 Reliability Data|
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.