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LTC3882IUJ Datasheet

Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller

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LTC3882
Dual Output PolyPhase
Step-Down DC/DC Voltage Mode Controller
with Digital Power System Management
FEATURES
nn PMBus/I2C Compliant Serial Interface
nn Monitor Voltage, Current, Temperature and Faults
nn Digitally Programmable Voltage, Current Limit,
Soft-Start/Stop, Sequencing, Margining, AVP and
UV/OV Thresholds
nn 3V ≤ VINSNS ≤ 38V, 0.5V ≤ VOUT ≤ 5.25V
nn ±0.5% Output Voltage Accuracy
nn Programmable PWM Frequency or External Clock
Synchronization from 250kHz to 1.25MHz
nn Accurate PolyPhase® Current Sharing
nn Internal EEPROM with Fault Logging and ECC
nn IC Supply Range: 3V to 13.2V
nn Resistor or Inductor DCR Current Sensing
nn Optional Resistor Programming for Key Parameters
nn 40-Pin (6mm × 6mm) QFN Package
nn AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
nn High Current Distributed Power Systems
nn Servers, Network and Storage Equipment
nn Intelligent Energy Efficient Power Regulation
nn Industrial/Telecom/ATE Systems
DESCRIPTION
The LTC®3882 is a dual, 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 0.5V to
5.25V using a wide range of 3.3V compatible power stages,
including power blocks, DrMOS or discrete FET drivers.
Up to four LTC3882s can operate in parallel for 2-, 3-, 4-,
6- or 8-phase operation.
LTC3882 system configuration and monitoring is sup-
ported by the LTpowerPlay® software tool. The device’s
serial interface can be used to read back input voltage,
output voltage and current, temperature and fault status.
A wide range of operating parameters can be set via the
digital interface or stored in internal EEPROM for use at
power up. Switching frequency and phase, output volt-
age and device address can also be programmed using
external configuration resistors.
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.
TYPICAL APPLICATION
VIN
7V TO 13.2V
TO/FROM
MCU
TO/FROM
EXTERNAL DEVICES
TO/FROM OTHER
OTHER PHASES
VCC VINSNS VSENSE0+
FB0
LTC3882
SDA
SCL
ALERT
RUN0
RUN1
WP
GPIO0
GPIO1
SHARE_CLK
SYNC
IAVG0
IAVG1
COMP0
COMP1
PWM0
TSNS0
ISENSE0+
ISENSE0–
VSENSE1+
ISENSE1–
ISENSE1+
PWM1
IAVG_GND
GND
TSNS1
VSENSE0–
FDMF5820DC
VIN
PWM
SW
GND
VIN FDMF5820DC SW
PWM GND
INDUCTORS: COOPER FP1007R1-R22
SOME DETAILS OMITTED FOR CLARITY
VOUT
1V
80A
3882 TA01a
For more information www.analog.com
Efficiency and Power Loss vs
Load Current
92
13
91
90
11
89
88
9
87
86
7
85
84
5
83
82
VIN = 12V
3
81
VOUT = 1V
SYNC = 500kHz
80
1
0 10 20 30 40 50 60 70 80
LOAD CURRENT (A)
3882 TA01b
Rev. C
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3882IUJ Datasheet

Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller

No Preview Available !

LTC3882
TABLE OF CONTENTS
Features.............................................................. 1
Applications......................................................... 1
Typical Application .................................................1
Description.......................................................... 1
Absolute Maximum Ratings.......................................4
Order Information...................................................4
Pin Configuration...................................................4
Electrical Characteristics..........................................5
Block Diagram..................................................... 14
Test Circuit......................................................... 15
Timing Diagram................................................... 15
Operation.......................................................... 15
Overview...................................................................... 15
Main Control Loop........................................................16
Power-Up and Initialization.......................................... 18
Soft-Start..................................................................... 19
Time-Based Output Sequencing................................... 19
Output Ramping Control.............................................. 19
Voltage-Based Output Sequencing............................... 19
Output Disable.............................................................. 19
Minimum Output Disable Times...................................20
Output Short Cycle.......................................................20
Light Load Current Operation.......................................20
Switching Frequency and Phase..................................20
PolyPhase Load Sharing..............................................21
Active Voltage Positioning............................................21
Input Supply Monitoring..............................................21
Output Voltage Sensing and Monitoring......................21
Output Current Sensing and Monitoring......................22
External and Internal Temperature Sense....................22
Resistor Configuration Pins.........................................22
Internal EEPROM with ECC and CRC............................23
Fault Detection.............................................................23
Input Supply Faults......................................................23
Hardwired PWM Response to VOUT Faults...................23
Power Good Indication.................................................24
Hardwired PWM Response to IOUT Faults....................24
Hardwired PWM Response to Temperature Faults.......24
Hardwired PWM Response to Timing Faults................24
External Faults..............................................................25
Fault Handling..............................................................25
Status Registers and ALERT Masking..........................25
Mapping Faults to GPIO Pins........................................27
Other GPIO Uses..........................................................27
Fault Logging................................................................27
Factory Default Operation............................................30
Serial Interface.............................................................31
Serial Bus Addressing..................................................31
Serial Bus Timeout.......................................................35
Serial Communication Errors.......................................35
PMBus Command Summary.................................... 36
PMBus Commands.......................................................36
Data Formats................................................................36
Applications Information........................................ 41
Efficiency Considerations.............................................41
PWM Frequency and Inductor Selection......................41
Power MOSFET Selection.............................................42
MOSFET Driver Selection.............................................43
Using PWM Protocols..................................................43
CIN Selection................................................................44
COUT Selection..............................................................45
Feedback Loop Compensation.....................................45
PCB Layout Considerations..........................................47
Output Current Sensing................................................48
Output Voltage Sensing................................................50
Soft-Start and Stop......................................................50
Time-Based Output Sequencing and Ramping.............51
Voltage-Based Output Sequencing...............................52
Using Output Voltage Servo.........................................53
Using AVP....................................................................53
PWM Frequency Synchronization................................55
PolyPhase Operation and Load Sharing.......................55
External Temperature Sense........................................58
Resistor Configuration Pins.........................................59
Internal Regulator Outputs...........................................60
IC Junction Temperature..............................................61
Derating EEPROM Retention at Temperature...............61
Configuring Open-Drain Pins.......................................61
PMBus Communication and Command Processing.....62
Status and Fault Log Management...............................63
LTpowerPlay – An Interactive Digital Power GUI..........64
Interfacing to the DC1613.............................................64
Design Example............................................................65
PMBus COMMAND DETAILS..................................... 67
Addressing and Write Protect...........................................67
PAGE............................................................................67
PAGE_PLUS_WRITE....................................................67
PAGE_PLUS_READ......................................................68
WRITE_PROTECT........................................................68
MFR_ADDRESS...........................................................69
MFR_RAIL_ADDRESS.................................................69
General Device Configuration...........................................69
PMBUS_REVISION.......................................................69
CAPABILITY.................................................................69
On, Off and Margin Control...............................................70
ON_OFF_CONFIG..........................................................70
MFR_CONFIG_ALL_LTC3882......................................70
OPERATION..................................................................71
MFR_RESET.................................................................71
PWM Configuration..........................................................72
FREQUENCY_SWITCH..................................................72
Rev. C
2
For more information www.analog.com


Part Number LTC3882IUJ
Description Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller
Maker Analog Devices
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