Overview
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
Product Details
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.
Applications
- VCORE and VI/O Supply Tracking
- Microprocessor, DSP and FPGA Supplies
- Servers
- Communication Systems
Product Categories
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
Data Sheets (1)
Reliability Data (1)
User Guides (1)
Design Notes (1)
Tools & Simulations
LTspice
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Models for the following parts are available in LTspice:
Reference Materials
Technical Articles (5)
LT Journal
Design Resources
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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.