Ultrathin Dual 14A or Single 28A μModule Regulator with Digital Power System Management

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Part Details
Part Models 2
1ku List Price Starting From $28.39
  • Dual, Fast, Analog Loops with Digital Interface for Control and Monitoring
  • Input Voltage Range: 4.5V to 5.75V Standalone, 2.375V to 5.75V with Aux 5V Bias
  • Output Voltage Range: 0.5V to 3.6V
  • ±0.5% Maximum DC Output Error Over Temperature
  • 14A DC Typical, 17A Peak Output Current, per Channel
  • ±10% Current Readback Accuracy at 10A Load
  • 400kHz PMBus-Compliant I2C Serial Interface
  • Integrated 16-Bit ΔΣ ADC
  • Supports Telemetry Polling Rates Up to 125Hz
  • Constant Frequency Current Mode Control
  • Parallel and Current Share Multiple Modules
  • All 7-Bit Slave Addresses Supported
  • Drop-In Pin-Compatible to Dual 10A LTM4686 and Dual 9A LTM4675 and Dual 13A LTM4676A and Dual 18A LTM4677
  • 16mm × 11.9mm × 1.82mm LGA Package
  • Readable Data
    • Input and Output Voltages, Currents, and Temperatures
    • Running Peak Values, Uptime, Faults and Warnings
    • Onboard EEPROM with ECC and Fault Log Record
  • Writable Data and Configurable Parameters
    • Output Voltage, Voltage Sequencing and Margining
    • Digital Soft-Start/Stop Ramp
    • OV/UV/OT, UVLO, Frequency and Phasing
Additional Details
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The LTM4686B is a dual 14A (17A peak) or single 28A (34A peak) step-down μModule® (micromodule) DC/ DC regulator with 39ms turn-on time. It features remote configurability and telemetry-monitoring of power management parameters over PMBus—an open standard I2C-based digital interface protocol . The LTM4686B is comprised of fast analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors and supporting components. A video on ultrathin module products is available on the website.

The LTM4686B’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. Input and output currents and voltages, output power, temperature, uptime and peak values are readable. Custom configuration of the EEPROM contents is not required. Pin-strap resistors configure start-up settings. The LTpowerPlay® GUI, DC1613 USB-to-PMBus converter, DC2086 programming adapter and demo kits are available.

Pb-free and RoHS compliant, the LTM4686B is available in a 16mm × 11.9mm × 1.82mm LGA package.


  • System Optimization in Prototype and Production
Part Models 2
1ku List Price Starting From $28.39

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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LTM4686B | Ultrathin Dual 14A or Single 28A μModule Regulator with Digital Power System Management



LTM4686B | Ultrathin Dual 14A or Single 28A μModule Regulator with Digital Power System Management

LTM4686B | Ultrathin Dual 14A or Single 28A μModule Regulator with Digital Power System Management

Product Detail

Demonstration circuit 3089A is a dual-output, high efficiency, high density, μModule regulator with 2.7V to 5.75V input range. Each output can supply 14A maximum load current. The demo board has a LTM4686B μModule regulator, which is a dual 14A or single 28A step-down regulator with digital power system management. Please see LTM4686B data sheet for more detailed information.

DC3089A 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 LTC’s 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.

GUI Download

The software can be downloaded from: ltpowerplay

For more details and instructions of LTpowerPlay, please refer to LTpowerPlay GUI for LTM4686B Quick Start Guide.

Tools & Simulations

Tools & Simulations 1

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.

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