LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Features

  • Order Custom Programmed Parts
  • 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 5.4V (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

Typical Application

LTC3880 Typical Application
LTC3880 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

6x6 QFN-40

LTC3880 Package Drawing
LTC3880 Package Drawing

Order Info

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 $8.86 $6.20 View
LTC3880IUJ#TRPBF QFN 40 I $6.26 View
LTC3880IUJ-1#PBF QFN 40 I $8.86 $6.20 View
LTC3880IUJ-1#TRPBF QFN 40 I $6.26 View
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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 Linear Technology sales office or authorized distributor.

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 (RSENSE) 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 (DCR) 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 LTC3880/-1 Demo Board I Programming Clamshell Socketed Demo Board $125.00
DC1740A-A LTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT0: 0.5V to 4.1V @ 80A, PMBus Controlled, works w/ DC1613 $250.00
DC1740A-B LTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT0: 0.5V to 4.1V @ 20A, VOUT1: 0.5V to 4.1V @ 60A, PMBus Controlled, works w/ DC1613 $250.00
DC1753A-A LTC3880EUJ Demo Board | Dual Phase Single Output, RSENSE, PSM, 6.5V ≤ VIN ≤ 24V, Vout = 0.5V to 3.3V @ 40A $200.00
DC1753A-B LTC3880EUJ Demo Board | Dual Phase Single Output, PSM, 6.5V ≤ VIN ≤ 24V, Vout = 0.5V to 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
DC1962C-KIT Starter Kit for Power System Management [Includes DC1962C, DC1613A] $125.00
DC2052A LTC3880EUJ/LTC3883EUH, 3-Phase Demo Board, Vin Range: 6.5V to 14V, Vout Range: 0.5V to 1.8V @ 60A, PMBus Controlled, works w/ DC1613 Dongle $250.00
DC2088A LTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT Range: 0.8V to 1.8V @ Up to 50A $250.00
DC2089A-A LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A Contact Factory
DC2089A-B LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A Contact Factory
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Companion Boards

Part Number Description Price Documentation
DC1613A USB-to-PMBus Controller $50.00
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Click here to view our complete list of demo boards

Applications

  • High Current Distributed Power Systems
  • Telecom, Datacom and Storage Systems
  • Intelligent Energy Efficient Power Regulation

Product Notifications

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Design Tools

LTpowerCAD

The LTpowerCAD II design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3880

LTpowerPlay

LTpowerPlay is a powerful development environment supporting Linear Technology's Digital Power System Management (PSM) products, providing unprecedented diagnostic and debug features.

Click here to download LTpowerPlay

LTspiceIV

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. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC3880
LTC3880-1

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