LTC7883

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Quad Output PolyPhase

Step-Down DC/DC Voltage Mode Controller

with Digital Power System Management

APPLICATIONS

All registered trademarks and trademarks are the property of their respective owners. Protected

by U.S. patents, including 5396245, 5859606, 6144194, 6937178, 7420359 and 7000125.

Load Step Transient Current Sharing

(Using FDMF5820DC DrMOS)

The LTC®7883 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, sup-

porting 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.

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Monitor Voltage, Current, Temperature and Faults

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Program Voltage, Soft-Start/Stop, Sequencing,

Margining, AVP and UV/OV/OC Limits

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3V ≤ VINSNS ≤ 38V, 0.1V (Limited by DrMOS

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±0.5% Output Voltage Error

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Programmable PWM Frequency or External Clock

Synchronization from 250kHz to 2.5MHz

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Internal EEPROM with Fault Logging and ECC

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IC Supply Range: 3V to 13.2V

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Resistor or Inductor DCR Current Sensing

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Power Good Output Voltage Monitor

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Supports Start-Up Into a Prebiased Load

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Optional Resistor Programming for Key Parameters

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99-Lead BGA Package (9mm × 7.5mm)

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High Current Distributed Power Systems

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Servers, Network and Storage Equipment

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Intelligent Energy Efficient Power Regulation

50µs/DIV

10A/DIV

10A/DIV

7883 TA01b

1/2 LTC7883

SDA_A

RUNA1

CSA0P

CSA0M

RUNA0

FLT1A1

FLTA0

FBA0

COMPA0

TSNSA0

TSNSA1

GND

7883 TA01a

IAVGNDA

PWMA0

CSA1M

CSA1P

PWMA1

7V TO 13.2V

TO/FROM

MCU

SCL_A

ALERTA

COMPA1

FDMF5820DC

FDMF5820DC

INDUCTORS: COOPER FP1007R1-R22

SOME DETAILS OMITTED FOR CLARITY

PWM

1V

100A

SW

GND

IAVGA1

IAVGA0

TO/FROM

EXTERNAL DEVICES

PGA1

SYNCA

CLKA

PGA0

PWM

SW

GND

L1

L0