Features

• PMBus/I²C Compliant Serial Interface
  – Telemetry Read-Back Includes VI_N, I_IN, V_OUT, I_OUT, Temperature and Faults
  – Programmable Voltage, Current Limit, Digital Soft- Start/Stop, Sequencing, Margining, OV/UV/OC
• Sub-Milliohm DCR Current Sensing
• Digitally Adjustable Loop Compensation Parameters
• ±0.5% Output Voltage Accuracy Over Temperature
• Integrated Input Current Sense Amplifier
• Internal EEPROM and Fault Logging
• Integrated N-Channel MOSFET Gate Drivers

Power Conversion

• Wide V_IN Range: 4.5V to 38V
• V_OUT Range: 0.5V to 3.5V (with Low DCR Setting); 0.5V to 5.5V (without Low DCR Setting)
• Accurate PolyPhase® Current Sharing for Up to 6 Phases
• Available in a 48-Lead (7mm × 7mm) QFN Package

Typical Application

Description

The LTC®3884 is a dual output PolyPhase DC/DC synchronous step-down switching regulator controller with an I²C-based PMBus compliant serial interface. The controller employs a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884 is supported by the LTpowerPlay® software development tool with graphical user interface (GUI).

Programmable loop compensation allows the controller to be compensated digitally. Switching frequency, channel phasing output voltage, and device address can be programmed both by the digital interface as well as external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Both outputs have independent power good indicators and FAULT function.

The LTC3884 can be configured for discontinuous (pulseskipping) mode or continuous inductor current mode.