LTC3877
RECOMMENDED FOR NEW DESIGNSDual Phase Step-Down Synchronous Controller with VID Output Voltage Programming and Low Value DCR Sensing
- Part Models
- 4
- 1ku List Price
- Starting From $5.97
Overview
- 6-Bit Parallel VID (Voltage Identification) Inputs Set Output Voltage from 0.6V to 1.23V in 10mV Steps
- Output Voltage Range: 0.6V to 5V (Without VID)
- Ultra Low Value DCR/RSENSE Current Sensing
- ±1% Maximum Total Regulation Voltage Accuracy Over Temperature
- Dual Differential Remote Sensing Amplifiers
- tON(MIN) = 40ns, Capable of Very Low Duty Cycles at High Frequency
- Phase-Lockable Frequency from 250kHz to 1MHz
- Current Mismatch Between Channels: 5% Max
- Adjustable Soft-Start Current Ramping or Tracking
- Multi-IC Operation Up To 12 Phases
- Wide VIN Range: 4.5V to 38V
- Dual Power Good Output Voltage Monitors
- Output Overvoltage Protection
- Foldback Output Current Limiting and Soft Recovery
The LTC3877 is a VID-programmable, constant frequency current mode step-down controller using an advanced and proprietary architecture. This new architecture enhances the signal-to-noise ratio of the current sense signal, allowing the use of very low DC resistance power inductors to maximize efficiency in high current applications. This feature also dramatically reduces the current sensing error, so that current sharing is greatly improved in multi-phase low DCR applications. In addition, the controller achieves a minimum on-time of just 40ns, permitting the use of high switching frequency at high step-down ratios.
The LTC3877 features dual high speed remote sense differential amplifiers, programmable current sense limits and DCR temperature compensation to limit the maximum output current precisely over temperature. The LTC3877 also features a precise 0.6V reference with guaranteed accuracy of ±0.5%. The LTC3877 is available in a low profile 44-lead 7mm × 7mm QFN package.
Applications
- FPGAs and Processor Power
- Servers and Computing
Documentation
Data Sheet 1
User Guide 1
Design Note 2
Technical Articles 3
Video 1
Press Release 1
Webcast 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 |
|---|---|---|---|
| LTC3877EUK#PBF | 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP) | ||
| LTC3877EUK#TRPBF | 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP) | ||
| LTC3877IUK#PBF | 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP) | ||
| LTC3877IUK#TRPBF | 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3877EUK#PBF | PRODUCTION | |
| LTC3877EUK#TRPBF | PRODUCTION | |
| LTC3877IUK#PBF | PRODUCTION | |
| LTC3877IUK#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2980 | RECOMMENDED FOR NEW DESIGNS | 16-Channel PMBus Power System Manager |
Evaluation Kits
LTC3877 Demo Board | Dual Buck Controller, Sub-mΩ DCR Sensing, 6V ≤ VIN ≤ 14V, VOUT1 is VID Programmable from 0.6V to 1.23V @ 30A, VOUT2 is 1.5V @ 30A
Resources
LTC3877/LTC3874 Demo Board | 4-Phase Buck Controller with VID Inputs, Sub-mΩ DCR Sensing, 6V ≤ VIN ≤ 14V, VOUT = 0.6V to 1.23V at 120A
Resources
Reference Designs
