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