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Product Info
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LTpowerCAD
Features
- 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
Typical Application
Description
The LTC®3870 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 |
4x5 QFN-28
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3870EUFD#PBF | QFN | 28 | E | $3.36 | $2.35 |
| LTC3870EUFD#TRPBF | QFN | 28 | E | $2.41 | |
| LTC3870IUFD#PBF | QFN | 28 | I | $3.62 | $2.53 |
| LTC3870IUFD#TRPBF | QFN | 28 | I | $2.59 | |
| LTC3870EUF-1#TRPBF | QFN | 24 | E | $2.41 | |
| LTC3870IUF-1#PBF | QFN | 24 | I | $3.62 | $2.53 |
| LTC3870IUF-1#TRPBF | QFN | 24 | I | $2.59 | |
| LTC3870EUF-1#PBF | QFN | 24 | E | $3.36 | $2.35 |
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 |
|---|---|---|---|
| DC2089A-A | LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A | Contact Factory | |
| DC2089A-B | LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A | $275.00 | |
| DC2155A-B | LTC3886UKG/LTC3870UFD Demo Board (RSENSE) | 4 Phase Single Output PMBus Buck 18V≤VIN ≤54V, VOUT=12V at 48A, 150kHz | Contact Factory |
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1613A | USB-to-PMBus Controller for Use with LTpowerPlay | $50.00 |