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LTC3870
PolyPhase Step-Down Slave Controller for Digital Power System Management
Alternative Parts
Overview
Features and Benefits
- LTC3880 Family Phase Extender Supporting LTC3880/3880-1, LTC3883/3883-1, LTC3886, LTC3887 Master Controllers
- Cascade with Multiple Chips for Very Large Current Applications
- Accurate PolyPhase Current Sharing
- EXTVCC Capable of 5V to 14V Input
- Wide VIN Range: 4.5V to 60V
- Wide Output Voltage Range : 0.5V to 14V
- Wide SYNC Frequency Range: 100kHz to 1MHz
- Pin Programmable of CCM/DCM Operation
- Pin Programmable of Phase-Shift Control
- Integrated Powerful N-Channel MOSFET Gate Drivers
- Available in a 28-Pin (4mm × 5mm) QFN Package
Product Details
The LTC3870 is a PolyPhase® step-down slave controller specially designed for multiphase operation with the LTC3880 family digital power system management DC/DC controllers. It provides a small and cost effective solution for supplying very large currents by cascading it with a master controller. A peak current mode architecture provides the LTC3870 with excellent current sharing from phase to phase and from chip to chip.
Coherently working with the LTC3880 family, the LTC3870 does not require additional I2C addresses, and it supports all programmable features as well as fault protection. The constant switching frequency can be synchronized to an external clock from the master controller from 100kHz to 1MHz.
| Onboard MOSFET Gate Drivers | Package | |
| LTC3870 | Yes | 4x5 QFN-28 |
| LTC3870-1 | No – Works with DrMOS and Power Blocks | 4x4 QFN-24 |
Applications
- High Power Distributed Power Systems
- Telecom Systems
- Industrial Applications
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (3)
Documentation
Reliability Data (1)
Product Information (1)
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
Product Recommendations
LTC3870 Companion Parts
Recommended Related Parts
Reference Materials
Videos (1)
LTC3870 Video Product Brief
Press Releases (1)
Technical Articles (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Support & Discussions
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.