LTM4675 datasheet(20/128 Pages) LINER

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LTC3884/LTC3884-1

3884fe

For more information www.linear.com/LTC3884

OPERATION

OVERVIEW

The LTC3884-1 has all the features that LTC3884 has,

except the LTC3884 includes MOSFET gate drivers while

the LTC3884-1 does not. LTC3884 is used in applications

where the gate driver is required while the LTC3884-1

is used in applications where the gate driver is external,

for example a DrMOS power stage. In the remainder of

this document, all the descriptions, features, operation

and applications of LTC3884 apply to LTC3884-1, unless

otherwise specified.

The LTC3884 is a dual channel/dual phase, constant-

frequency,analogcurrentmodecontrollerforDC/DCstep-

down applications with a digital interface. The LTC3884

digital interface is compatible with PMBus which supports

bus speeds of up to 400kHz. A Typical Application circuit

is shown on the first page of this data sheet.

LTC3884 is very similar to LTC3880, but has numerous

new features as shown in bold:

Major features include:

Sub-Milliohm DCR Sensing

Dedicated Power Good Indicators

Direct Input and Chip Current Sensing

Programmable Loop Compensation Parameters

TINIT Start-Up Time: 35ms

PWM Synchronization Circuit, (See Frequency and

Phasing Section for Details)

MFR_ADC_CONTROL for Fast ADC Sampling of One

Parameter (as Fast as 8ms) (See PMBus Command

for Details)

Fully Differential Output Sensing for Both Channels;

VOUT0/1 Both Programmable Up to 5.5V

Power-Up and Program EEPROM with EXTVCC

Input Voltage Up to 38V

Dual Diode Temperature Sensing

SYNC Contention Circuit (Refer to Frequency and

Phase Section for Details)

Fault Logging

Programmable Output Voltage

Programmable Input Voltage On and Off Threshold

Voltage

Programmable Current Limit

Programmable Switching Frequency

Programmable OV and UV Threshold voltage

Programmable ON and Off Delay Times

Programmable Output Rise/Fall Times

Phase-Locked Loop for Synchronous PolyPhase

Operation (2, 3, 4 or 6 Phases).

Integrated Gate Drivers (LTC3884)

Nonvolatile Configuration Memory with ECC

Optional External Configuration Resistors for Key

Operating Parameters

Optional Timebase Interconnect for Synchronization

Between Multiple Controllers

WP Pin to Protect Internal Configuration

StandAloneOperationAfterUserFactoryConfiguration

PMBus, Version 1.2, 400kHz Compliant Interface

The PMBus interface provides access to important power

management data during system operation including:

Internal Controller Temperature

External System Temperature via Optional Diode Sense

Elements

Average Output Current

Average Output Voltage

Average Input Voltage

Average Input Current

Average Chip Input Current from VIN

Configurable, Latched and Unlatched Individual Fault

and Warning Status

IndividualchannelsareaccessedthroughthePMBususing

the PAGE command, i.e., PAGE 0 or 1.

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