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

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. 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.

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
  • 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

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

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3880EUJ-1#PBF6x6 QFN-40E$7.64$5.35
LTC3880EUJ-1#TRPBF6x6 QFN-40E$5.41
LTC3880EUJ#PBF6x6 QFN-40E$7.64$5.35
LTC3880EUJ#TRPBF6x6 QFN-40E$5.41
LTC3880IUJ-1#PBF6x6 QFN-40I$8.86$6.20
LTC3880IUJ-1#TRPBF6x6 QFN-40I$6.26
LTC3880IUJ#PBF6x6 QFN-40I$8.86$6.20
LTC3880IUJ#TRPBF6x6 QFN-40I$6.26
Demo Boards
Part NumberDescriptionPrice
DC1590B-ALTC3880EUJ 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-BLTC3880EUJ 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
DC1709ALTC3880/-1 Demo Board I Programming Clamshell Socketed Demo Board$125.00
DC1740A-ALTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT0: 0.5V to 4.1V @ 80A, PMBus Controlled, works w/ DC1613$250.00
DC1740A-BLTC3880EUJ 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-ALTC3880EUJ Demo Board (RSENSE) | Dual Phase Single Output, PMBus Buck, 6.5V ≤ VIN ≤ 24V, Vout = 0.5V to 3.3V @ 40A$200.00
DC1753B-ALTC3880EUJ Demo Board (RSENSE) I Dual Phase Single Output PMBus Buck, 6.5V ≤ Vin ≤ 24V, Vout = 0.5V to 3.3V @ 40AContact Factory
DC1753B-BLTC3880EUJ Demo Board (DCR Sense) I Dual Phase Single Output PMBus Buck, 6.5V ≤ Vin ≤ 24V, Vout = 0.5V to 3.3V @ 40AContact Factory
DC1962CPower System Management Demo Board (PowerStick): 14-Supply Management with LTC2977, LTC2974 & LTC3880 [Requires DC1613]$95.00
DC1962C-KITStarter Kit for Power System Management [Includes DC1962C, DC1613A]$125.00
DC2052ALTC3880EUJ/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
DC2088ALTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT Range: 0.8V to 1.8V @ Up to 50A$250.00
DC2089A-ALTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80AContact Factory
DC2089A-BLTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A$275.00
Companion Boards
Part NumberDescriptionPrice
DC1613AUSB-to-PMBus Controller for Use with LTpowerPlay$50.00
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
DC2294ADC2294A - PSM Linduino One Shield [requires DC2026, CA2978]$50.00
Datasheet
Spec Notice
Application Note
Reliability Data
Product Selector Card
LT Journal
Product Info
Press Release
Ad
LTspice
LTpowerCAD
Linduino
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LTC3880 Footprints and Symbols
Digital Power Done Right
LTC3880 Demo Circuit - High Efficiency Dual 500kHz 3.3V/1.8V Step-Down Converter (6-24V to 3.3V @ 15A & 1.8V @ 15A)
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LTC3880 Project - Dual, Step-Down DC/DC Controller with Digital Power System Management & Inductor DCR Current Sensing (6.5-24V to 1.5V @ 20A & 1.8V @ 20A)
LTC3880 Project - Dual, Step-Down DC/DC Controller with Digital Power System Management & Rsense Current Sensing (6.5-24V to 1.5V @ 20A & 1.8V @ 20A)
LTC3880 Project - PolyPhase Step-Down DC/DC Controllers with Digital Power System Management & Inductor DCR Current Sensing (7-14V to 1.2V @ 100A)
LTC3880 Project - PolyPhase Step-Down DC/DC Controllers with Digital Power System Management & Rsense Current Sensing (6.5-24V to 1.8V @ 40A)
LTC3880 - DC1590B Linduino .INO File
LTC3880 - Linduino CPP File
LTC3880 - Linduino Header File
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