LTC7883
Info : RECOMMENDED FOR NEW DESIGNS
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LTC7883

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 1
1ku List Price Starting From $10.02
Features
  • 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 tON_MIN) ≤ VOUT ≤ 5.25V
  • ±0.5% Output Voltage Error
  • Programmable PWM Frequency or External Clock Synchronization from 250kHz to 2.5MHz
  • Accurate PolyPhase® Current Sharing
  • Internal EEPROM with Fault Logging and ECC
  • IC Supply Range: 3V to 13.2V
  • Resistor or Inductor DCR Current Sensing
  • Power Good Output Voltage Monitor
  • Supports Start-Up Into a Prebiased Load
  • Optional Resistor Programming for Key Parameters
  • 99-Lead BGA Package (9mm × 7.5mm)
Additional Details
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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.

APPLICATIONS

  • High Current Distributed Power Systems
  • Servers, Network and Storage Equipment
  • Intelligent Energy Efficient Power Regulation
Part Models 1
1ku List Price Starting From $10.02

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC7883AY#PBF
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Software and Part Ecosystem

Software and Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC3170A

4-Phase Step-Down Supply with Power System Management

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DC3170A

4-Phase Step-Down Supply with Power System Management

4-Phase Step-Down Supply with Power System Management

Product Detail

Demonstration circuit DC3170A‐A/‐B features the LTC7883 and LTC7051 in a high current, high efficiency 4-phase step-down converter. The LTC7883 itself is a 4-channel, 4-phase, voltage mode step‐down controller with a PSM interface. The LTC7051 is a SilentMOS™ smart power stage that integrates high speed drivers with low RDS(ON) MOSFETs. The DC3170A‐A/‐B comes in two different assembly types, which are specified below:

DC3170A‐A: LTC7883 + LTC7051 Demo Board with Four Outputs

  • VOA0 = 0.75V/50A
  • VOA1 = 0.9V/50A
  • VOB0 = 1.0V/50A
  • VOB1 = 1.2V/50A

DC3170A‐B: LTC7883 + LTC7051 Demo Board with Single Output

  • VOUT = 1.0V/200A, 4‐phase

The DC3170A‐A/‐B operates with a switching frequency of 500kHz over an input voltage range of 7V to 14V. Each LTC7051 is driven by a three‐state PWM output of the LTC7883, while the LTC7051’s current sense and temperature outputs are monitored by the LTC7883. The DC3170A‐A/‐B does not require external serial bus communications to run. It uses settings pre‐programmed in the non-volatile memory of the LTC7883.

To fully explore the extensive power system management features of the LTC7883, download LTpowerPlay® onto the PC and use ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the LTC7883 while running, store the configuration in non-volatile memory, view telemetry of voltage, current, temperature, fault status, and more. For more details and instructions on LTpowerPlay, see the LTpowerPlay Software GUI section of this manual. The LTC7883 and LTC7051 data sheets provide a complete description of the IC operation and application information and must be read in conjunction with this demo manual.

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