LTC3870-1

RECOMMENDED FOR NEW DESIGNS

PolyPhase Step-Down Slave Controller for Digital Power System Management

Part Models: 4
1ku List Price: Starting From $2.84

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Part Details

LTC3887-1 Phase Extender
Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs
Cascade with Multiple Chips for Very Large Current Applications
Accurate PolyPhase Current Sharing
EXTV_CC Capable of 5V to 14V Input
Wide V_IN Range: 4.5V to 60V
Wide Output Voltage Range : 0.5V to 14V
Wide SYNC Frequency Range: 100kHz to 1MHz
Pin Programmable CCM/DCM Operation
Pin Programmable Phase-Shift Control
Available in a 24-Pin (4mm × 4mm) QFN Package

The LTC3870-1 is a PolyPhase^® step-down slave controller specially designed for multiphase operation with LTC's 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 LTC3887-1 controller. A peak current mode architecture provides the LTC3870-1 with excellent current sharing from phase to phase and from chip to chip.

Coherently working with the LTC3887-1, the LTC3870-1 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 LTC3887-1 over a range of 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

Part Models: 4
1ku List Price: Starting From $2.84

Documentation

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3870EUF-1#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3870EUF-1#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3870IUF-1#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3870IUF-1#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
External Power Switch Buck Controllers 1
LTC3887 LTC3887-1 LTC3887-2		Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Parts	Product Life Cycle	Description
LTC3870	RECOMMENDED FOR NEW DESIGNS	PolyPhase Step-Down Slave Controller for Digital Power System Management

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3870
LTC3870-1

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.

Evaluation Kits

LTC3887EUJ-1/LTC3870EUF-1 Demo Board | Dual Phase PMBus Buck Controller with Slave Controller, 7V ≤ VIN ≤ 14V, 0.8V ≤ VOUT ≤ 1.8V @ 100A

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Product Details

Demonstration circuit 2454A is a high current, high efficiency, poly-phase synchronous buck converter featuring the LTC3887EUJ-1, a dual-phase current mode controller, and the LTC3870EUF-1, a dual-phase slave controller. The LTC3887-1 has the PMBus interface and the power system management functions.

Resources

DC2454A - Schematic
101.00K

DC2454A - Design Files
2.00M

DC2454A - Demo Manual
1.00M

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Informational 1