Power Management Switching Regulator Step-Down (Buck) Regulators Multiple Output Buck
Power Management Switching Regulator Step-Down (Buck) Regulators External Power Switch Buck Controllers

LTC2960 - 36V Nano-Current Two-Input Voltage Monitor

LTC2974 - 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

LTC3860 - Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing

Features

  • Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs
  • Constant Frequency Voltage Mode Control with Accurate Current Sharing
  • ±0.75% 0.6V Voltage Reference
  • Differential Remote Output Voltage Sense Amplifier
  • Multiphase Capability—Up to 12-Phase Operation
  • Programmable Current Limit
  • Safely Powers a Prebiased Load
  • Programmable or PLL-Synchronizable Switching Frequency Up to 1.25MHz
  • Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor
  • VCC Range: 3V to 5.5V
  • VIN Range: 3V to 24V
  • Power Good Output Voltage Monitor
  • Output Voltage Tracking Capability
  • Programmable Soft-Start
  • Available in a 32- Pin 5mm × 5mm QFN Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages

Typical Application

LTC3860 Typical Application

Description

The LTC3860 is a dual, PolyPhase synchronous stepdown switching regulator controller for high current distributed power systems, digital signal processors, and other telecom and industrial DC/DC power supplies. It uses a constant frequency voltage mode architecture combined with very low offset, high bandwidth error amplifiers and a remote output sense differential amplifier for excellent transient response and output regulation.

The controller incorporates lossless inductor DCR current sensing to maintain current balance between phases and to provide overcurrent protection. The chip operates from a VCC supply between 3V and 5.5V and is designed for stepdown conversion from VIN between 3V and 24V to output voltages between 0.6V and VCC – 0.5V.

The TRACK/SS pins provide programmable soft-start or tracking functions. Inductor current reversal is disabled during soft-start to safely power prebiased loads. The constant operating frequency can be synchronized to an external clock or linearly programmed from 250kHz to 1.25MHz. Up to six LTC3860 controllers can operate in parallel for 1-, 2-, 3-, 4-, 6- or 12-phase operation.

The LTC3860 is available in a 32-pin 5mm × 5mm QFN package.

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
LTC3860EUH#PBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC3860EUH#TRPBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC3860IUH#PBF 5x5 QFN-32 UH I 05-08-1693 Yes
LTC3860IUH#TRPBF 5x5 QFN-32 UH I 05-08-1693 Yes


LTC3860 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
LTC3860EUH#PBF 5x5 QFN-32 E $3.70 $2.59 Yes
LTC3860EUH#TRPBF 5x5 QFN-32 E $2.65 Yes
LTC3860IUH#PBF 5x5 QFN-32 I $4.26 $2.98 Yes
LTC3860IUH#TRPBF 5x5 QFN-32 I $3.04 Yes
Buy Now • Request Samples
* 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
DC1184A LTC3860EUH Demo Board |10V to 14VIN, 1.2V/25A and 1.8V/25A VOUT $150.00
DC1755A LTC3860EUH Demo Board I Vin Range: 6V to 14V, 1.2V/50A and 1.5V/50A VOUT $350.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC3860IUH#PBF 5x5 QFN-32 I $4.26 $2.98 Yes
LTC3860IUH#TRPBF 5x5 QFN-32 I $3.04 Yes
Buy Now • Request Samples
* 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.

Applications

  • High Current Distributed Power Systems
  • Digital Signal Processor and ASIC Supplies
  • Telecom Systems
  • Industrial Power Supplies

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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

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:
LTC3860

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:

  • Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
  • Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
  • Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu

Design tools for the following parts are available in LTpowerCAD:
LTC3860
LTC3860 Parallel

Technical Support