Analog Devices LTC3884

Description

The LTCR3884/LTC3884-1 are dual output PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. Thecontrollers employ a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884/LTC3884-1 are supported by the LTpowerPlayR 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 has integrated gate drivers. The LTC3884-1 has three-state PWM pins to drive power blocks or DrMOS APPLICATIONS power stages.

Features

• PMBus/I2C Compliant Serial Interface
• Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, 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 with ECC and Fault Logging
• Integrated N-Channel MOSFET Gate Drivers (LTC3884) Power Conversion
• Wide VIN Range: 4.5V to 38V
• VOUT 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 48-Lead 7mm × 7mm QFN and5mm × 6mm GQFN Packages.

Typical applications

• Industrial and Point-of-Load Applications
• Telecom, Datacom, and Storage Systems

More information

• Datasheet
• IC product information