LTC3884 - Dual Output PolyPhase Step-Down Controller with Sub-Milliohm DCR Sensing and Digital Power System Management
Features
- 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/OC - Sub-Milliohm DCR Current Sensing
- Digitally Adjustable Loop Compensation Parameters
- ±0.5% Output Voltage Accuracy Over Temperature
- Integrated Input Current Sense Amplifier
- Internal EEPROM and Fault Logging
- Integrated N-Channel MOSFET Gate Drivers
Power Conversion
- Wide VIN Range: 4.5V to 38V
- VOUT Range: 0.5V to 3.5V (with Low DCR Setting); 0.5V to 5.5V (without Low DCR Setting)
- Accurate PolyPhase® Current Sharing for Up to 6 Phases
- Available in a 48-Lead (7mm × 7mm) QFN Package
Typical Application
Description
The LTC®3884 is a dual output PolyPhase DC/DC synchronous step-down switching regulator controller with an I2C-based PMBus compliant serial interface. The controller employs a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884 is supported by the LTpowerPlay® software development tool with graphical user interface (GUI).
Programmable loop compensation allows the controller to be compensated digitally. Switching frequency, channel phasing output voltage, and device address can be programmed both by the digital interface as well as external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Both outputs have independent power good indicators and FAULT function.
The LTC3884 can be configured for discontinuous (pulseskipping) mode or continuous inductor current mode.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3884EUK#PBF | 7x7 QFN-48 | UK | E | 05-08-1704 | Yes |
| LTC3884EUK#TRPBF | 7x7 QFN-48 | UK | E | 05-08-1704 | Yes |
| LTC3884IUK#PBF | 7x7 QFN-48 | UK | I | 05-08-1704 | Yes |
| LTC3884IUK#TRPBF | 7x7 QFN-48 | UK | I | 05-08-1704 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3884EUK#PBF | 7x7 QFN-48 | E | $9.07 | $6.35 | Yes | |
| LTC3884EUK#TRPBF | 7x7 QFN-48 | E | $6.41 | Yes | ||
| LTC3884IUK#PBF | 7x7 QFN-48 | I | $9.91 | $6.94 | Yes | |
| LTC3884IUK#TRPBF | 7x7 QFN-48 | I | $7.00 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
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 |
|---|---|---|---|
| DC2084A | LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, Vout = 0.5V to 1.5V @ 240A | Contact Factory | |
| DC2165A | LTC3884EUK Demo Board | Dual PMBus Buck, 4.5V ≤ Vin ≤ 14V, Vout0/Vout1 = 0.5V to 1.8V @ 30A | $200.00 | |
| DC2283A | LTC3884EUK Demo Board | LTC3884(x2) 4-Phase PMBus Buck, 7V ≤ VIN ≤ 14V; 0.5V ≤ VOUT ≤ 1.5V @ 160A | Contact Factory | |
| DC2298A | LTC3884 Demo Board I Programming Clamshell Socketed Demo Board | Contact Factory | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1613A | USB-to-PMBus Controller for Use with LTpowerPlay | $50.00 | |
| Buy Now | |||
Applications
- Telecom, Datacom, and Storage Systems
- Industrial and Point-of-Load Applications
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Product Notifications
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3884
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
To open the project file for this circuit:
- Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
- Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
- Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu
Design tools for the following parts are available in LTpowerCAD:
LTC3884
LTC3884 Parallel
LTC3884+LTC3874 Parallel
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
