LTC3884 - Dual Output PolyPhase Step-Down Controller with Sub-Milliohm DCR Sensing and 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/OC
  • Sub-Milliohm DCR Current Sensing
  • Digitally Adjustable Loop Compensation Parameters
  • ±0.5% Output Voltage Accuracy Over Temperature
  • Integrated Input Current Sense Amplifier
  • Internal EEPROM  with ECC and Fault Logging
  • Integrated N-Channel MOSFET Gate Drivers

Power Conversion

  • Wide VIN Range: 4.5V to 38V
  • VOUT Range: 0.5V to 3.5V (with Low DCR Setting); 0.5V to 5.5V (without Low DCR Setting)
  • Accurate PolyPhase® Current Sharing for Up to 6 Phases
  • Available in a 48-Lead (7mm × 7mm) QFN Package

Typical Application

LTC3884 Typical Application
LTC3884 Typical Application

Description

The LTC®3884 is a dual output PolyPhase DC/DC synchronous step-down switching regulator controller with an I2C-based PMBus compliant serial interface. The controller employs a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884 is supported by the LTpowerPlay® software development tool with graphical user interface (GUI).

Programmable loop compensation allows the controller to be compensated digitally. Switching frequency, channel phasing output voltage, and device address can be programmed both by the digital interface as well as external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Both outputs have independent power good indicators and FAULT function.

The LTC3884-1 has all the features that the LTC3884 has except the LTC3884 includes MOSFET gate drivers while the LTC3884-1 does not.

 

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3884ERHE-1#PBF 5x6 GQFN-48 RHE E 05-08-1527 Yes
LTC3884ERHE-1#TRPBF 5x6 GQFN-48 RHE E 05-08-1527 Yes
LTC3884ERHE#PBF 5x6 GQFN-48 RHE E 05-08-1527 Yes
LTC3884ERHE#TRPBF 5x6 GQFN-48 RHE E 05-08-1527 Yes
LTC3884EUK#PBF 7x7 QFN-48 UK E 05-08-1704 Yes
LTC3884EUK#TRPBF 7x7 QFN-48 UK E 05-08-1704 Yes
LTC3884IRHE-1#PBF 5x6 GQFN-48 RHE I 05-08-1527 Yes
LTC3884IRHE-1#TRPBF 5x6 GQFN-48 RHE I 05-08-1527 Yes
LTC3884IRHE#PBF 5x6 GQFN-48 RHE I 05-08-1527 Yes
LTC3884IRHE#TRPBF 5x6 GQFN-48 RHE I 05-08-1527 Yes
LTC3884IUK#PBF 7x7 QFN-48 UK I 05-08-1704 Yes
LTC3884IUK#TRPBF 7x7 QFN-48 UK I 05-08-1704 Yes


LTC3884 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • 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 Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3884ERHE-1#PBF 5x6 GQFN-48 E $9.07 $6.35 Yes
LTC3884ERHE-1#TRPBF 5x6 GQFN-48 E $9.13 $6.41 Yes
LTC3884ERHE#PBF 5x6 GQFN-48 E $9.07 $6.35 Yes
LTC3884ERHE#TRPBF 5x6 GQFN-48 E $9.13 $6.41 Yes
LTC3884EUK#PBF 7x7 QFN-48 E $9.07 $6.35 Yes
LTC3884EUK#TRPBF 7x7 QFN-48 E $6.41 Yes
LTC3884IRHE-1#PBF 5x6 GQFN-48 I $9.91 $6.94 Yes
LTC3884IRHE-1#TRPBF 5x6 GQFN-48 I $9.97 $7.00 Yes
LTC3884IRHE#PBF 5x6 GQFN-48 I $9.91 $6.94 Yes
LTC3884IRHE#TRPBF 5x6 GQFN-48 I $9.97 $7.00 Yes
LTC3884IUK#PBF 7x7 QFN-48 I $9.91 $6.94 Yes
LTC3884IUK#TRPBF 7x7 QFN-48 I $7.00 Yes
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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
DC2084A LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, Vout = 0.5V to 1.5V @ 240A Contact Factory
DC2165A LTC3884EUK Demo Board | Dual PMBus Buck, 4.5V ≤ Vin ≤ 14V, Vout0/Vout1 = 0.5V to 1.8V @ 30A $200.00
DC2283A LTC3884EUK Demo Board | LTC3884(x2) 4-Phase PMBus Buck, 7V ≤ VIN ≤ 14V; 0.5V ≤ VOUT ≤ 1.5V @ 160A Contact Factory
DC2298A LTC3884 Demo Board I Programming Clamshell Socketed Demo Board Contact Factory
Buy Now

Companion Boards

Part Number Description Price Documentation
DC1613A USB-to-PMBus Controller for Use with LTpowerPlay $50.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Telecom, Datacom, and Storage Systems
  • Industrial and Point-of-Load Applications

Product Notifications

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Design Tools

LTspice

LTspice® software 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

Models for the following parts are available in LTspice:
LTC3884

LTpowerCAD

The LTpowerCAD 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

To open the project file for this circuit:

Design tools for the following parts are available in LTpowerCAD:
LTC3884
LTC3884 Parallel
LTC3884+LTC3874 Parallel

Technical Support