LTC3870
RECOMMENDED FOR NEW DESIGNSPolyPhase Step-Down Slave Controller for Digital Power System Management
- Part Models
- 4
- 1ku List Price
- Starting From $3.60
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 2
Technical Articles 1
Informational 1
Product Information 1
Video 1
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 |
|---|---|---|---|
| LTC3870EUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3870EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3870IUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3870IUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3870EUFD#PBF | PRODUCTION | |
| LTC3870EUFD#TRPBF | PRODUCTION | |
| LTC3870IUFD#PBF | PRODUCTION | |
| LTC3870IUFD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 4 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
| LTC3883 LTC3883-1 | Single Phase Step-Down DC/DC Controller with Digital Power System Management | |
|
LTC3886 LTC3886-1 |
60V Dual Output Step-Down Controller with Digital Power System Management | |
|
LTC3887 LTC3887-1 LTC3887-2 |
Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management | |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3870-1 | RECOMMENDED FOR NEW DESIGNS | PolyPhase Step-Down Slave Controller for Digital Power System Management |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3870
- LTC3870-1
LTpowerCAD 3
- LTC3886 & LTC3870 Project - 4 Phase Single Output PMBus Buck (18-54Vin to 12Vout @ 48A)
- LTC3880 & LTC3870 Project - PolyPhase Digital PSM Step-Down with Rsense Sensing Plus Two Slave Controllers (7-14V to 1V @ 80A)
- LTC3880 & LTC3870 Project - PolyPhase Digital PSM Step-Down with Ultra-Low DCR Sensing Plus Two Slave Controllers (7-14V to 1V @ 80A)
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.
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.
Evaluation Kits
LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A
Resources
Software
LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A
Resources
Software
LTC3886UKG/LTC3870UFD Demo Board (RSENSE) | 4 Phase Single Output PMBus Buck 18V≤VIN ≤54V, VOUT=12V at 48A, 150kHz