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LTC3887LTC3887-1
Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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 Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)
- ±0.5% Output Voltage Accuracy over Temperature
- Integrated 16-Bit ADC
- Compatible with LT1001
- Internal EEPROM with ECC and Fault Logging
- Integrated Powerful N-Channel MOSFET Gate Drivers
Power Conversion
- Wide VIN Range: 4.5V to 24V
- VOUT Range: 0.5V to 5.4V (4V on VOUT0)
- Analog Current Mode Control Loop
- Supports Power-Up Into Pre-Biased Load
- Accurate PolyPhase® Current Sharing for Up to 6 Phases
- Available in a 40-Pin (6mm × 6mm) QFN Package
Product Details
The LTC3880/LTC3880-1 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay™ software development tool with graphical user interface (GUI).
Switching frequency, output voltage, and device address can be programmed using external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface. The LTC3880 incorporates a 5V linear regulator while the LTC3880-1 uses an external 5V supply for minimum power loss. See comparison to LTC3887 below.
| VOUT Start-Up Time | Max VOUT0/1 | Fast ADC Mode for 1 Parameter | |
| LTC3887/LTC3887-1 | 35ms | 5.5V/5.5V | No |
| LTC3880/LTC3880-1 | 120ms | 4V/5.4V | No |
Applications
- High Current Distributed Power Systems
- Telecom, Datacom and Storage Systems
- Intelligent Energy Efficient Power Regulation
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 (14)
Documentation
Reliability Data (1)
Application Notes (7)
Solutions Bulletins & Brochures (1)
Spec Notice (1)
Evaluation Kit Manuals (9)
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
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:
Linduino
Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits.
Design Tools
LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.
Reference Materials
Solutions Bulletins & Brochures (1)
Guide To Ordering Custom Programmed EEPROM Devices
Integration of Analog DC/DC Controller with Digital Power Management
A Guide to Ordering Custom Programmed Digital Power System Management Devices
What Is Digital Power System Management?
LTC3870 Video Product Brief
Technical Articles (8)
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
LTC3880 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.
