Analog Devices LTC3887-1

Description

The LTCR3887/LTC3887-1 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlayR a software development tool with graphical user interface (GUI). Switching frequency, channel phasing, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface.The LTC3887 has integrated gate drivers. The LTC3887-1 has three-state PWM pins to drive power blocks or DrMOS power stages. The LTC3887 is an enhanced version of theLTC3880 with greater output voltage range and more digital features. Refer to page 15 for more detail.

Features

• PMBus/I2C Compliant Serial Interface
• Telemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature, Duty Cycle and Faults
• Programmable Voltage, Current Limit, DigitalSoft-Start/Stop, Sequencing, Margining, OV/UVand Frequency Synchronization (250kHz to 1MHz)
• ±0.5% Output Voltage Accuracy Over Temperature
• Integrated 16-Bit ADC
• VOUT Range: 0.5V to 5.5V (VOUT0, VOUT1)
• Internal EEPROM and Fault Logging with ECC
• Integrated N-Channel MOSFET Gate Drivers (LTC3887)
• Minimum On-Time 45ns
• Wide VIN Range: 4.5V to 24V
• Analog Current Mode Control Loop
• Remote Differential Sense for PolyPhase® Applications
• Accurate PolyPhase Current Sharing for Up to Six Phases
• Available in a 40-Pin (6mm × 6mm) QFN Package

Typical applications

• High Current Distributed Power Systems / Intelligent Energy Efficient Power Regulation
• Telecom, Datacom and Storage Systems

More information

• Datasheet
• IC product information