FEATURES

n Quad Digitally Adjustable Analog Loops with Digital

Interface for Control and Monitoring

n Wide Input Voltage Range: 4.5V to 16V

n Output Voltage Range: 0.5V to 3.3V

n ±0.5% Maximum DC Output Error Over Temperature

n ±4% Current Readback Accuracy: 0°C to 125°C

n Integrated Input Current Sense Amplifier

n 400kHz PMBus-Compliant I2C Serial Interface

n Supports Telemetry Polling Rates Up to 125Hz

n Integrated 16-Bit ∆Σ ADC

n Parallel and Current Share Multiple Modules

n 15mm × 22mm × 8.17mm BGA Package

Readable Data:

n Input and Output Voltages, Currents, and Temperatures

n Running Peak Values, Uptime, Faults and Warnings

n Onboard EEPROM Fault Log Record

Writable Data and Configurable Parameters:

n Output Voltage, Voltage Sequencing and Margining

n Digital Soft-Start/Stop Ramp, Program Analog Loop

n OV/UV/OT, UVLO, Frequency and Phasing

APPLICATIONS

n Multi-Rail Processor Power, Configurable Core Power

DESCRIPTION

The LTM®4681 is a quad 31.25A or single 125A stepdown µModule® (power module) DC/DC regulator featuring remote configurability and telemetry-monitoring

of power management parameters over PMBus. The

LTM4681 is comprised of digitally programmable analog

control loops, precision mixed-signal circuitry, EEPROM,

power MOSFETs, inductors and supporting components.

The LTM4681’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 pinstrapping resistors. The LTpowerPlay® GUI and DC1613

USB-to-PMBus converter and demo kits are available.

The LTM4681 is offered in a 15mm × 22mm × 8.17mm

BGA package available with SnPb or RoHS compliant

terminal finish.