Dual 25A or Single 50A µModule Regulator with 0.8% DC and 3% Transient Accuracy
Dual 25A or Single 50A DC/DC μModule Regulator
Dual 18A or Single 36A μModule (Power Module) Regulator with Digital Power System Management
Dual 13A or Single 26A μModule (Power Module) Regulator with Digital Power System Management
Features and Benefits
- Dual Digitally Adjustable Analog Loops with Digital Interface for Control and Monitoring
- Wide Input Voltage Range: 4.5V to 16V
- Output Voltage Range: 0.5V to 3.4V
- ±0.5% Maximum DC Output Error Over Temperature
- ±3.5% Current Readback Accuracy, –20°C to 125°C
- Sub-Milliohm DCR Current Sensing
- Integrated Input Current Sense Amplifier
- 400kHz PMBus-Compliant I2C Serial Interface
- Supports Telemetry Polling Rates up to 125Hz
- Integrated 16-Bit ∆Σ ADC
- Constant Frequency Current Mode Control
- Parallel and Current Share Up to 250A
- 16mm × 16mm × 5.86mm CoP-BGA Package
- Input and Output Voltages, Currents, and Temperatures
- Running Peak Values, Uptime, Faults and Warnings
- Onboard EEPROM Fault Log Record
- Output Voltage, Voltage Sequencing and Margining
- Digital Soft-Start/Stop Ramp, Program Analog Loop
- OV/UV/OT, UVLO, Frequency and Phasing
Writable Data and Configurable Parameters
The LTM4678 is a dual 25A or single 50A step-down µModule® (power module) DC/DC regulator featuring remote configurability and telemetry-monitoring of power management parameters over PMBus—an open standard I2C-based digital interface protocol . The LTM4678 is comprised of digitally programmable analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors and supporting components.
The LTM4678’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. True input current sense, output currents and voltages, output power, temperatures, uptime and peak values are readable. Custom configuration of the EEPROM contents is not required. At start-up, output voltages, switching frequency, and channel phase angle assignments can be set by pin-strapping resistors. The LTpowerPlay® GUI and DC1613 USB-to-PMBus converter and demo kits are available.
The LTM4678 is offered in a 16mm × 16mm × 5.86mm CoP-BGA package available with SnPb or RoHS compliant terminal finish.
- System Optimization, Characterization and Data Mining in Prototype, Production and Field Environments
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 2552A is a dual-output, high efficiency, high density, µModule regulator with 4.5V to 16V input range. Each output can supply 25A maximum load current. The demo board has a LTM4678 µModule regulator, which is a dual 25A or single 50A step-down regulator with digital power system management. Please see LTM4678 data sheet for more detailed information.
DC2552A powers up to default settings and produce power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay® onto your PC and use Analog Devices’ I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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.
Design tools for the following parts are available in LTpowerCAD:
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.