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LTC3880IUJ Datasheet

Dual Output PolyPhase Step-Down DC/DC Controller

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LTC3880/LTC3880-1
Dual Output PolyPhase Step-Down DC/DC Controller
with Digital Power System Management
FEATURES
nn PMBus/I2C Compliant Serial Interface
nn Telemetry Read Back includes VIN, IIN, VOUT, IOUT,
Temperature and Faults
nn Programmable Voltage, Current Limit, Digital
Soft-Start/Stop, Sequencing, Margining, OV/UV
and Frequency Synchronization (250kHz to 1MHz)
nn ±0.5% Output Voltage Accuracy Over Temperature
nn Integrated 16-Bit ADC
nn Internal EEPROM with ECC and Fault Logging
nn Integrated Powerful N-Channel MOSFET Gate Drivers
Power Conversion
nn Wide VIN Range: 4.5V to 24V
nn VOUT Range: 0.5V to 5.4V (4V on VOUT0)
nn Analog Current Mode Control Loop
nn Accurate PolyPhase® Current Sharing for Up to 6 Phases
nn Available in a 40-Pin (6mm × 6mm) QFN Package
nn AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
nn High Current Distributed Power Systems
nn Telecom, Datacom and Storage Systems
nn Intelligent Energy Efficient Power Regulation
DESCRIPTION
The LTC®3880/LTC3880-1 are dual, PolyPhase DC/DC
synchronous step-down switching regulator controllers
with an I2C-based PMBus compliant serial interface.
The controllers use a constant frequency, current mode
architecture that is supported by LTpowerPlay™ software
development tool with graphical user interface (GUI).
Switching frequency, output voltage, and device address
can be programmed using external configuration resistors.
Parameters can be set via the digital interface or stored in
EEPROM. Voltage, current, internal/external temperature
and fault status can be read back through the bus interface.
The LTC3880 incorporates a 5V linear regulator while the
LTC3880-1 uses an external 5V supply for minimum power
loss. See comparison to LTC3887 below.
LTC3887/LTC3887-1
LTC3880/LTC3880-1
VOUT
Start-Up Time
35ms
120ms
Max
VOUT0/1
5.5V/5.5V
4V/5.4V
Fast ADC Mode
for 1 Parameter
Yes
No
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 5408150,
7420359. Licensed under U.S. Patent 7000125 and other related patents worldwide.
TYPICAL APPLICATION
VIN
VOUT0
3.3V
15A
1.0µH
2.15k
0.2µF
10µF
0.1µF
VIN INTVCC
TG0
TG1
LTC3880
BOOST0 BOOST1
SW0
SW1
BG0
BG1
PGND
1µF
0.1µF
0.56µH
1.74k
0.2µF
+
530µF
10nF 2200pF
6.04k
ISENSEO+ ISENSE1+
ISENSEO– ISENSE1–
VSENSEO+ VSENSE1
VSENSEO–
TSNS0 TSNS1
2200pF
4.99k
ITHO
ITH1
10nF
SOME DETAILS OMITTED
PMBus
FOR CLARITY
INTERFACE
TO/FROM
OTHER LTC DEVICES
WRITE PROTECT
SDA
GPIO0
SCL
GPIO1
ALERT
RUN0
RUN1
VDD33
VDD25
SHARE_CLK
SYNC
SGND
WP
FAULT MANAGEMENT
1µF
1µF
VOUT1
1.8V
20A
+
530µF
3880 TA01a
Document Feedback
For more information www.analog.com
Efficiency and Power Loss
vs Load Current
100
6
90
VIN = 12V
VOUT = 1.8V
80
5
70
4
60
50
3
40
30
2
20
1
10
0
0
0.01
0.1
1
10
100
LOAD CURRENT (A)
3880 TA01b
Rev. H
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3880IUJ Datasheet

Dual Output PolyPhase Step-Down DC/DC Controller

No Preview Available !

LTC3880/LTC3880-1
TABLE OF CONTENTS
Features...................................................... 1
Applications................................................. 1
Typical Application......................................... 1
Description.................................................. 1
Table of Contents........................................... 2
Absolute Maximum Ratings............................... 4
Pin Configuration........................................... 4
Order Information........................................... 4
Electrical Characteristics.................................. 5
Typical Performance Characteristics................... 11
Pin Functions............................................... 15
Block Diagram.............................................. 17
Operation................................................... 18
Overview.................................................................. 18
Main Control Loop................................................... 18
EEPROM.................................................................. 19
Power Up and Initialization......................................20
Soft-Start................................................................. 20
Sequencing.............................................................. 21
Voltage-Based Sequencing...................................... 21
Shutdown................................................................ 21
Light Load Current Operation..................................22
Switching Frequency and Phase..............................22
Output Voltage Sensing...........................................23
Current Sensing.......................................................23
Load Sharing........................................................... 24
External/Internal Temperature Sense....................... 24
RCONFIG (Resistor Configuration) Pins...................25
Fault Detection and Handling................................... 25
Internal Memory with CRC and ECC....................26
Serial Interface........................................................ 27
Communication Failure ....................................... 27
Device Addressing................................................... 27
Responses to VOUT and IOUT Faults......................... 28
Output Overvoltage Fault Response.................... 28
Output Undervoltage Response .......................... 28
Peak Output Overcurrent Fault Response............ 28
Responses to Timing Faults.....................................29
Responses to VIN OV Faults.....................................29
Responses to OT/UT Faults......................................29
Overtemperature Fault Response—Internal .......29
Overtemperature and Undertemperature
Fault Response—Externals ................................29
Responses to External Faults ..................................29
Bus Timeout Failure.................................................30
Similarity Between PMBus, SMBus and I2C
2-Wire Interface.......................................................30
PMBus Serial Digital Interface................................. 31
PMBus Command Summary............................. 34
PMBus Commands..................................................34
*Data Format...........................................................39
Applications Information................................. 40
Current Limit Programming.....................................40
ISENSE+ and ISENSE– Pins..........................................40
Low Value Resistor Current Sensing........................ 41
Inductor DCR Current Sensing................................. 42
Slope Compensation and Inductor Peak Current.....43
Inductor Value Calculation.......................................43
Inductor Core Selection...........................................44
Power MOSFET and Schottky Diode (Optional)
Selection.................................................................. 44
Variable Delay Time, Soft-Start and Output Voltage
Ramping.................................................................. 45
Digital Servo Mode..................................................46
Soft Off (Sequenced Off).........................................46
INTVCC Regulator..................................................... 47
Topside MOSFET Driver Supply (CB, DB).................48
Undervoltage Lockout..............................................48
CIN and COUT Selection............................................48
Fault Conditions....................................................... 49
Open-Drain Pins......................................................50
Phase-Locked Loop and Frequency
Synchronization....................................................... 50
Minimum On-Time Considerations.......................... 51
Rev. H
2
For more information www.analog.com


Part Number LTC3880IUJ
Description Dual Output PolyPhase Step-Down DC/DC Controller
Maker Analog Devices
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