Analog Devices LTM4678 | Demoboard DC2638A-B

Description

The LTM®4678 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 I 2C-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.

Features

• Dual Digitally Adjustable Analog Loops with DigitalInterface 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 PackageReadable Data
• Input and Output Voltages, Currents, and Temperatures
• Running Peak Values, Uptime, Faults and Warnings
• Onboard EEPROM Fault Log RecordWritable Data and Configurable Parameters
• Output Voltage, Voltage Sequencing and Margining
• Digital Soft-Start/Stop Ramp, Program Analog Loop
• OV/UV/OT, UVLO, Frequency and Phasing

Typical applications

• System Optimization, Characterization and Data Mining in Prototype, Production and Field Environments

More information

• Datasheet