Features

• Order Custom Programmed Parts
• PMBus/I²C Compliant Serial Interface
  – Telemetry Read Back includes V_IN, I_IN, V_OUT, I_OUT,
• Temperature, Duty Cycle and Faults
  – Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)
• ±0.5% Output Voltage Accuracy Over Temperature
• Integrated 16-Bit ADC
• V_OUT Range: 0.5V to 5.5V (V_OUT0, V_OUT1)
• Internal EEPROM and Fault Logging
• Integrated N-Channel MOSFET Gate Drivers (LTC3887)
• Wide V_IN 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
• Download LTpowerPlay software

Typical Application

Description

The LTC®3887/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 LTpowerPlay™ 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 the LTC3880 with greater output voltage range and more digital features. Refer to page 15 for more detail.