Power Management
Switching Regulator
Step-Down (Buck) Regulators
Poly-Phase Buck Controllers
Power Management
Switching Regulator
Step-Down (Buck) Regulators
External Power Switch Buck Controllers
Power Management
System Supervisor, Monitor and Control
Sequencers, Trackers, and Margining Controllers
Power Management
System Supervisor, Monitor and Control
Power System Management
LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Features
- 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
- Internal EEPROM and Fault Logging
- Integrated Powerful N-Channel MOSFET Gate Drivers
- LTpowerPlay Configuration and Development Tool
Power Conversion
- Wide VIN Range: 4.5V to 24V
- VOUT Range: 0.5V to 5.5V
- 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
Typical Application
Description
The LTC®3880/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. Additionally, 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/LTC3880-1 can be configured for Burst Mode® operation, discontinuous (pulse-skipping) mode or continuous inductor current mode. The LTC3880 incorporates a 5V linear regulator while the LTC3880-1 uses an external 5V supply for minimum power loss.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-40
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC3880EUJ#PBF | QFN | 40 | E | $7.64 | $5.35 | View |
| LTC3880EUJ#TRPBF | QFN | 40 | E | $5.41 | View | |
| LTC3880EUJ-1#PBF | QFN | 40 | E | $7.64 | $5.35 | View |
| LTC3880EUJ-1#TRPBF | QFN | 40 | E | $5.41 | View | |
| LTC3880IUJ#PBF | QFN | 40 | I | $8.40 | $5.88 | View |
| LTC3880IUJ#TRPBF | QFN | 40 | I | $5.94 | View | |
| LTC3880IUJ-1#PBF | QFN | 40 | I | $8.40 | $5.88 | View |
| LTC3880IUJ-1#TRPBF | QFN | 40 | I | $5.94 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1590B-A | LTC3880EUJ Demo Board I RSense Demo Board I Vin Range: 6.5V to 24V, VOUT0: 0.5V to 4V @ 20A, VOUT1 : 0.5V to 5V @ 20A, PMBus Controlled, works w/ DC1613A | $200.00 | |
| DC1590B-B | LTC3880EUJ Demo Board I DCR Sense Demo Board I Vin Range: 6.5V to 24V, VOUT0: 0.5V to 4V @ 20A, VOUT1 : 0.5V to 5V @ 20A, PMBus Controlled, works w/ DC1613A | $200.00 | |
| DC1709A | LTC38880/-1 Demo Board I Programming Clamshell Socketed Demo Board | $125.00 | |
| DC1753A-A | LTC3880EUJ Dual Phase Single Output Demo Board | 6.5V < VIN < 24V; 0.5V < VOUT < 3.3V @ 40A, with RSENSE Current Sense | $200.00 | |
| DC1753A-B | LTC3880EUJ Dual Phase Single Output Demo Board | 6.5V < VIN < 24V; 0.5V < VOUT < 3.3V @ 40A, with DCR Current Sense | $200.00 | |
| DC1962C | Power System Management Demo Board (PowerStick): 14-Supply Management with LTC2977, LTC2974 & LTC3880 [Requires DC1613] | $95.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1613A | USB-to-PMBus Controller | $50.00 | |
| Buy Now | |||
Applications
- High Current Distributed Power Systems
- Telecom, Datacom and Storage Systems
- Intelligent Energy Efficient Power Regulation
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Product Notifications
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Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, 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
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LTC3880-1
LTC3880
LTpowerPlay is the FREE Graphical User Interface (GUI) software provided by Linear Technology for use with our family of digital power products. LTpowerPlay provides unprecedented diagnostic and debug features. It becomes a valuable diagnostic tool during board bring-up to program or tweak the power management scheme in a system or to diagnose power issues when bringing up rails.
- Download LTpowerPlay software
- When LTpowerPlay launches the first time, it will prompt you to request a license, click 'Request a License Key...', enter the required information, then click 'Send License Request'
- Once you have entered the registration information, you will receive an email with your license file and instructions for installing it
- For further information, please visit www.linear.com/ltpowerplay
- Access technical support documents for LTC Digital Power Products by visiting www.ltpowerplay.com/help
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
