Quad Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

The LTC7883 is a quad, PolyPhase DC/DC synchronous step-down switching regulator controller with PMBus compliant serial interface. It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. Each PWM channel can produce output voltages from 0.1V to 5.25V using a wide range of 3.3V compatible power stages, including power blocks, DrMOS or discrete FET drivers. LTC7883 devices can operate in parallel, supporting ideal phasor positioning for PolyPhase rails up to 8 phases.

System configuration and monitoring is supported by the LTpowerPlay® software tool. The LTC7883 serial interfaces can read back input voltage, output voltage and current, temperature and fault status. Most operating parameters can be set via the digital interfaces or stored in internal EEPROM for use at power-up. Switching frequency and phase, output voltage and device address can also be set using external configuration resistors.

Note: ADI does not recommend using the following PWM frequencies in new designs: 600kHz, 750kHz, 900kHz, and 1MHz.

Applications

* High Current Distributed Power Systems

* Servers, Network and Storage Equipment

* Intelligent Energy Efficient Power Regulation

* PMBus/I2C Compliant Serial Interface

* Monitor Voltage, Current, Temperature and Faults

* Program Voltage, Soft-Start/Stop, Sequencing, Margining, AVP and UV/OV/OC Limits

* 3V ≤ VINSNS ≤ 38V, 0.1V (Limited by DrMOS tONMIN) ≤ VOUT ≤ 5.25V

* ±0.5% Output Voltage Error

* Programmable PWM Frequency or External Clock Synchronization from 250kHz to 2.5MHz