LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Datasheet 
VideosDocumentationDatasheet
Spec Notice
Application Note
- AN135 - Implementing Robust PMBus System Software for the LTC3880
- AN137 - Accurate Temperature Sensing with an External P-N Junction
- AN145 - Overview of the EEPROM in LTC PSM Devices
- AN152 - Power System Management Addressing
- AN153 - Linduino for Power System Management
- AN155 - Fault Log Decoding with Linduino PSM
Reliability Data
Product Selector Card
- Digital Power System Management
- PMBus DC/DC Converters with Power System Management
- PMBus Power System Managers
- Power and Thermal Monitoring
- Power System Management
LT Journal
Product Info
Press Release
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LTpowerCAD
- 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)
- LTC3880 Project - Dual, Step-Down DC/DC Controller with Digital Power System Management & Inductor DCR Current Sensing (6.5-24V to 1.5V @ 20A & 1.8V @ 20A)
- LTC3880 Project - Dual, Step-Down DC/DC Controller with Digital Power System Management & Rsense Current Sensing (6.5-24V to 1.5V @ 20A & 1.8V @ 20A)
- LTC3880 Project - PolyPhase Step-Down DC/DC Controllers with Digital Power System Management & Inductor DCR Current Sensing (7-14V to 1.2V @ 100A)
- LTC3880 Project - PolyPhase Step-Down DC/DC Controllers with Digital Power System Management & Rsense Current Sensing (6.5-24V to 1.8V @ 40A)
Linduino
Features
- Order Custom Programmed Parts
- PMBus/I2C Compliant Serial Interface
– Telemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature and Faults
– Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz) - ±0.5% Output Voltage Accuracy over Temperature
- Integrated 16-Bit ADC
- Internal EEPROM and Fault Logging
- Integrated Powerful N-Channel MOSFET Gate Drivers
- LTpowerPlay Configuration and Development Tool
Power Conversion
- Wide VIN Range: 4.5V to 24V
- VOUT Range: 0.5V to 5.4V (4V on VOUT0)
- Analog Current Mode Control Loop
- Supports Power-Up Into Pre-Biased Load
- Accurate PolyPhase® Current Sharing for Up to 6 Phases
- Available in a 40-Pin (6mm × 6mm) QFN Package
Typical Application
Description
The LTC®3880/LTC3880-1 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay™ software development tool with graphical user interface (GUI).
Switching frequency, output voltage, and device address can be programmed using external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface. The LTC3880 incorporates a 5V linear regulator while the LTC3880-1 uses an external 5V supply for minimum power loss. See comparison to LTC3887 below.
| VOUT Start-Up Time | Max VOUT0/1 | Fast ADC Mode for 1 Parameter | |
| LTC3887/LTC3887-1 | 70ms | 5.5V/5.5V | Yes |
| LTC3880/LTC3880-1 | 145ms | 4V/5.4V | No |
6x6 QFN-40
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3880EUJ#PBF | QFN | 40 | E | $7.64 | $5.35 |
| LTC3880EUJ#TRPBF | QFN | 40 | E | $5.41 | |
| LTC3880EUJ-1#PBF | QFN | 40 | E | $7.64 | $5.35 |
| LTC3880EUJ-1#TRPBF | QFN | 40 | E | $5.41 | |
| LTC3880IUJ#PBF | QFN | 40 | I | $8.86 | $6.20 |
| LTC3880IUJ#TRPBF | QFN | 40 | I | $6.26 | |
| LTC3880IUJ-1#PBF | QFN | 40 | I | $8.86 | $6.20 |
| LTC3880IUJ-1#TRPBF | QFN | 40 | I | $6.26 |
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 |
|---|---|---|---|
| DC1590B-A | LTC3880EUJ Demo Board (RSENSE) I Vin Range: 6.5V to 24V, VOUT0 = 0.5V to 4V @ 20A, VOUT1 = 0.5V to 5V @ 20A, PMBus Controlled, works w/ DC1613A | $200.00 | |
| DC1590B-B | LTC3880EUJ Demo Board (DCR) I Vin Range: 6.5V to 24V, VOUT0 = 0.5V to 4V @ 20A, VOUT1 = 0.5V to 5V @ 20A, PMBus Controlled, works w/ DC1613A | $200.00 | |
| DC1709A | LTC3880/-1 & LTC3887/-1 Demo Board I Programming Clamshell Socketed Demo Board | $125.00 | |
| DC1740A-A | LTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT0: 0.5V to 4.1V @ 80A, PMBus Controlled, works w/ DC1613 | $250.00 | |
| DC1740A-B | LTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT0: 0.5V to 4.1V @ 20A, VOUT1: 0.5V to 4.1V @ 60A, PMBus Controlled, works w/ DC1613 | $250.00 | |
| DC1753A-A | LTC3880EUJ Demo Board (RSENSE) | Dual Phase Single Output, PMBus Buck, 6.5V ≤ VIN ≤ 24V, Vout = 0.5V to 3.3V @ 40A | $200.00 | |
| DC1753B-A | LTC3880EUJ Demo Board (RSENSE) I Dual Phase Single Output PMBus Buck, 6.5V ≤ Vin ≤ 24V, Vout = 0.5V to 3.3V @ 40A | Contact Factory | |
| DC1753B-B | LTC3880EUJ Demo Board (DCR Sense) I Dual Phase Single Output PMBus Buck, 6.5V ≤ Vin ≤ 24V, Vout = 0.5V to 3.3V @ 40A | Contact Factory | |
| DC1962C | Power System Management Demo Board (PowerStick): 14-Supply Management with LTC2977, LTC2974 & LTC3880 [Requires DC1613] | $95.00 | |
| DC1962C-KIT | Starter Kit for Power System Management [Includes DC1962C, DC1613A] | $125.00 | |
| DC2052A | LTC3880EUJ/LTC3883EUH, 3-Phase Demo Board, Vin Range: 6.5V to 14V, Vout Range: 0.5V to 1.8V @ 60A, PMBus Controlled, works w/ DC1613 Dongle | $250.00 | |
| DC2088A | LTC3880EUJ Demo Board | 7V ≤ VIN ≤ 14V; VOUT Range: 0.8V to 1.8V @ Up to 50A | $250.00 | |
| 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 |
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1613A | USB-to-PMBus Controller for Use with LTpowerPlay | $50.00 | |
| DC2026C | Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform | $75.00 | |
| DC2294A | DC2294A - PSM Linduino One Shield [requires DC2026, CA2978] | $50.00 |