LTC3887/LTC3887-1 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

The LTC®3887/LTC3887-1 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™ a software development tool with graphical user interface (GUI).

Switching frequency, channel phasing, 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 LTC3887 has integrated gate drivers. The LTC3887-1 has three-state PWM pins to drive power blocks or DrMOS power stages. The LTC3887 is an enhanced version of the LTC3880 with greater output voltage range and more digital features. Refer to page 15 for more detail.

Features
  • Order Custom Programmed Parts
  • PMBus/I2C Compliant Serial Interface – Telemetry Read Back includes VIN, IIN, VOUT, IOUT,
  • Temperature, Duty Cycle 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
  • VOUT Range: 0.5V to 5.5V (VOUT0, VOUT1)
  • Internal EEPROM and Fault Logging
  • Integrated N-Channel MOSFET Gate Drivers (LTC3887)
  • Wide VIN Range: 4.5V to 24V
  • Analog Current Mode Control Loop
  • Remote Differential Sense for PolyPhase® Applications
  • Accurate PolyPhase Current Sharing for Up to Six Phases
  • Available in a 40-Pin (6mm × 6mm) QFN Package
  • Download LTpowerPlay software
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)*
LTC3887EUJ-1#PBF6x6 QFN-40E$7.82$5.47
LTC3887EUJ-1#TRPBF6x6 QFN-40E$5.53
LTC3887EUJ#PBF6x6 QFN-40E$7.82$5.47
LTC3887EUJ#TRPBF6x6 QFN-40E$5.53
LTC3887IUJ-1#PBF6x6 QFN-40I$8.99$6.29
LTC3887IUJ-1#TRPBF6x6 QFN-40I$6.35
LTC3887IUJ#PBF6x6 QFN-40I$8.99$6.29
LTC3887IUJ#TRPBF6x6 QFN-40I$6.35
Demo Boards
Part NumberDescriptionPrice
DC2263A-ALTC3887EUJ Demo Board (RSENSE) | Dual PMBus Buck, 7V ≤ VIN ≤ 18V, Vout0/Vout1 = 0.8V to 1.8V @ 25AContact Factory
DC2263A-BLTC3887EUJ Demo Board (DCR SENSE) | 2 Phase PMBus Buck, 7V ≤ VIN ≤ 18V, Vout = 0.8V to 1.8V @ 50AContact Factory
DC2394ALTC3887EUJ-1 Demo Board (DCR Sense) | PMBus Buck with DrMOS, 7V ≤ VIN ≤ 14V, Vout0/Vout1 = 0.8V to 1.8V @ 30AContact Factory
Companion Boards
Part NumberDescriptionPrice
DC1613AUSB-to-PMBus Controller for Use with LTpowerPlay$50.00
Datasheet
Spec Notice
Application Note
Reliability Data
Product Selector Card
Product Info
Press Release
LTpowerCAD
Linduino
Related Product
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Product Errata - LTC3887
AN145 - Overview of the EEPROM in LTC PSM Devices
R526 - Reliability Data
Digital Power System Management
LTC3880 to LTC3887 - Migration Guide
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Dual Synchronous Step-Down DC/DC Controller with Digital Power System Management & Fast 70ms Start-Up
LTC3887 Footprints and Symbols
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LTC3887 - DC2263A.ino
LTC3887 - Linduino CPP File
LTC3887 - Linduino Header File