DESCRIPTION

The LTM®4683 is a quad 31.25A or single 125A stepdown

μModule® (power micromodule) DC/DC regulator

featuring remote configurability and telemetry monitoring

of power management parameters over PMBus. The

LTM4683 is comprised of digitally programmable analog

control loops, and is optimized for higher bandwidth and

transient response.

The LTM4683’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® graphical

user interface (GUI), DC1613A USB-to-PMBus converter,

and evaluation kits are available.

FEATURES

n Quad Digitally Adjustable Analog Loops with Digital

Interface for Control and Monitoring

n Wide Input Voltage Range: 4.5V to 14V

n Output Voltage Range: 0.3V to 0.7V

n ±0.5 DC Output Accuracy at 0.7V

n ±4.5 Current Readback Accuracy: 0°C to 125°C

n Optimized for Low Output Voltage Ranges

n 400kHz PMBus-Compliant I2C Serial Interface

n Supports Telemetry Polling Rates Up to 125Hz

n Integrated 16-Bit ΔΣ ADC

n Parallel and Current Share Multiple Modules

n 15mm × 22mm × 5.71mm 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/Soft-Stop Ramp, Program Analog Loop

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

APPLICATIONS

n Multi-Rail Processor Power, Configurable Core Power

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