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Overview
Features and Benefits
- PMBus/I2C Compliant Serial Interface
- Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and Faults
- Programmable Voltage, Current Limit, Digital SoftStart/Stop, Sequencing, Margining, OV/UV/OC
- Sub-Milliohm DCR Current Sensing
- Digitally Adjustable Loop Compensation Parameters
- ±0.5% Output Voltage Accuracy Over Temperature
- Integrated Input Current Sense Amplifier
- Internal EEPROM with ECC and Fault Logging
- Integrated N-Channel MOSFET Gate Drivers (LTC3884)
- Wide VIN Range: 4.5V to 38V
- VOUT Range: 0.5V to 3.5V (with Low DCR Setting); 0.5V to 5.5V (without Low DCR Setting)
- Accurate PolyPhase® Current Sharing for Up to 6 Phases
- Available in 48-Lead 7mm × 7mm QFN and 5mm × 6mm GQFN Packages.
Product Details
The LTC3884 is a dual output PolyPhase DC/DC synchronous step-down switching regulator controller with an I2C-based PMBus compliant serial interface. The controller employs a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884 is supported by the LTpowerPlay® software development tool with graphical user interface (GUI).
Programmable loop compensation allows the controller to be compensated digitally. Switching frequency, channel phasing output voltage, and device address can be programmed both by the digital interface as well as external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Both outputs have independent power good indicators and FAULT function.
The LTC3884-1 has all the features that the LTC3884 has except the LTC3884 includes MOSFET gate drivers while the LTC3884-1 does not.
Applications
- Telecom, Datacom, and Storage Systems
- Industrial and Point-of-Load Applications
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (5)
Documentation
Reliability Data (1)
Application Notes (7)
Spec Notice (1)
Tools & Simulations
LTspice
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:
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
LTpowerCAD Project Files
Design tools for the following parts are available in LTpowerCAD:
Reference Materials
Product Selector Card (1)
Press Releases (1)
Design Resources
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.
Discussions
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Sample & Buy
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.
