LTC2921/LTC2922 Series: Power Supply Tracker with Input Monitors Data Sheet10/2/2017316K
Features and Benefits
- Tracks Multiple Supplies with MOSFET Switches
- Monitors 5 Input Voltages Including VCC
- Guaranteed Threshold Accuracy: ±1% at 0.5V
- Automatic Remote Sense Switching
- Adjustable Supply Ramp Rate
- Overvoltage Monitor
- Adjustable Electronic Circuit Breaker
- Adjustable Power-Good Delay
- Available for VCC Supply Voltages of 5V, 3.3V and 2.5V
- Available in 16-Pin Narrow SSOP (LTC2921 Series) and 20-Pin TSSOP (LTC2922 Series)
The LTC2921 and LTC2922 monitor up to five supplies and force them to track on power-up in multiple supply systems. Using external N-channel pass transistors, the supplies can be ramped up at an adjustable rate. Automatic remote sense switching allows the DC/DC converters to compensate for series voltage drops in the wiring. An incorrect level on one or more of the supplies triggers disconnect of all supplies. Tight 1% accuracy and glitch immunity on the low 0.5V monitoring level ensure no false error disconnects.
The LTC2921 and LTC2922 each feature an adjustable electronic circuit breaker to protect the VCC supply against short circuits. Capacitance at the TIMER pin programs the delays in the monitoring sequence.
The LTC2921 includes three remote sense switches in a 16-pin narrow SSOP package, while the LTC2922 includes five remote sense switches in a 20-pin TSSOP package. Both parts are available for VCC supply voltages of 5V, 3.3V, and 2.5V.
- Desktop Computers
- Plug-In Cards
- Telecom Infrastructure
- Supply Sequencing
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 (3)
DC740A-A: Demo Board for the LTC2922 Power Supply Tracker with Input Monitors.
DC740A-C: Demo Board for the LTC2922 Power Supply Tracker with Input Monitors.
DC740A-B: Demo Board for the LTC2922 Power Supply Tracker with Input Monitors.
Documentation & Resources
R493 Reliability Data3/26/201820 K
DC740A - Demo Manual9/24/2009185K
Dual 500mA µPower LDO Features Independent 1.8V–20V Inputs and Easy Sequencing in a 4mm × 3mm DFN4/1/2010 LT Journal
Single Device Tracks and Monitors Five Supplies5/1/2004 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:
LTC2922 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|
|LTC2922CF#PBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922CF#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922CF-2.5#PBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922CF-2.5#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922CF-3.3#PBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922CF-3.3#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922IF#PBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922IF#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922IF-2.5#PBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922IF-2.5#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922IF-3.3#PBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|LTC2922IF-3.3#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP|
|Wafer Fabrication Data||R493 Reliability Data|
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
Sample & Buy
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Please see the latest communication from our CCO regarding lead times.
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.