DESCRIPTION
The LTM®4686B 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 mixedsignal
circuitry, EEPROM, power MOSFETs, inductors
and supporting components. A video on ultrathin module
products is available on the website. Click here .
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.
FEATURES
n Dual, Fast, Analog Loops with Digital Interface for
Control and Monitoring
n Input Voltage Range: 4.5V to 5.75V Standalone,
2.375V to 5.75V with Aux 5V Bias
n Output Voltage Range: 0.5V to 3.6V
n ±0.5% Maximum DC Output Error Over Temperature
n 14A DC Typical, 17A Peak Output Current, per Channel
n ±10% Current Readback Accuracy at 10A Load
n 400kHz PMBus-Compliant I2C Serial Interface
n Integrated 16-Bit ΔΣ ADC
n Supports Telemetry Polling Rates Up to 125Hz
n Constant Frequency Current Mode Control
n Parallel and Current Share Multiple Modules
n All 7-Bit Slave Addresses Supported
n Drop-In Pin-Compatible to Dual 10A LTM4686 and
Dual 9A LTM4675 and Dual 13A LTM4676A and Dual
18A LTM4677
n 16mm × 11.9mm × 1.82mm LGA Package
Readable Data
n Input and Output Voltages, Currents, and Temperatures
n Running Peak Values, Uptime, Faults and Warnings
n Onboard EEPROM with ECC and Fault Log Record
Writable Data and Configurable Parameters
n Output Voltage, Voltage Sequencing and Margining
n Digital Soft-Start/Stop Ramp
n OV/UV/OT, UVLO, Frequency and Phasing

APPLICATIONS
n System Optimization in Prototype and Production