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LTC3880EUJ#TRPBF

Description
DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP T/R
File Size1MB，118 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3880EUJ#TRPBF Overview

DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP T/R

LTC3880EUJ#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs2
TopologyStep Down
Output Voltage (V)0.5 to 5.5
Maximum Switching Frequency (kHz)1000
Minimum Input Voltage (V)4.5
Maximum Input Voltage (V)24
Operating Supply Voltage (V)4.5 to 24
Maximum Supply Current (mA)25(Typ)
Minimum Switching Frequency (kHz)250
Synchronous RectifierYes
Synchronous ClockYes
Control MethodPWM
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)105
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count40
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length6
Package Width6
PCB changed40
Lead ShapeNo Lead

LTC3880EUJ#TRPBF Preview

LTC3880/LTC3880-1
Dual Output PolyPhase Step-Down DC/DC Controller
with Digital Power System Management
FEATURES
PMBus/I
2
C Compliant Serial Interface
n
Telemetry Read Back includes V , I , V
IN IN OUT
, I
OUT
,
Temperature and Faults
n
Programmable Voltage, Current Limit, Digital
Soft-Start/Stop, Sequencing, Margining, OV/UV
and Frequency Synchronization (250kHz to 1MHz)
n
±0.5% Output Voltage Accuracy Over Temperature
n
Integrated 16-Bit ADC
n
Internal EEPROM with ECC and Fault Logging
n
Integrated Powerful N-Channel MOSFET Gate Drivers
Power Conversion
n
Wide V Range: 4.5V to 24V
IN
n
V
OUT
Range: 0.5V to 5.4V (4V on V
OUT0
)
n
Analog Current Mode Control Loop
n
Accurate PolyPhase
®
Current Sharing for Up to 6 Phases
n
Available in a 40-Pin (6mm
×
6mm) QFN Package
n
AEC-Q100 Qualified for Automotive Applications
n
DESCRIPTION
The
LTC
®
3880/LTC3880-1
are dual, PolyPhase DC/DC
synchronous step-down switching regulator controllers
with an I
2
C-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.
V
OUT
Start-Up Time
LTC3887/LTC3887-1
LTC3880/LTC3880-1
35ms
120ms
Max
V
OUT0/1
5.5V/5.5V
4V/5.4V
Fast ADC Mode
for 1 Parameter
Yes
No
APPLICATIONS
n
n
n
High Current Distributed Power Systems
Telecom, Datacom and Storage Systems
Intelligent Energy Efficient Power Regulation
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
V
IN
10µF
V
IN
0.1µF
V
OUT0
3.3V
15A
1.0µH
2.15k
0.2µF
TG0
INTV
CC
TG1
0.1µF
0.56µH
1.74k
0.2µF
V
OUT1
1.8V
20A
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0.01
1
0.1
10
LOAD CURRENT (A)
2
1
0
100
3880 TA01b
1µF
Efficiency and Power Loss
vs Load Current
V
IN
= 12V
V
OUT
= 1.8V
6
5
4
3
POWER LOSS (W)
LTC3880
BOOST0
SW0
BG0
PGND
I
SENSEO+
I
SENSEO–
V
SENSEO+
V
SENSEO–
TSNS0
10nF
6.04k
2200pF
I
THO
BOOST1
SW1
BG1
I
SENSE1+
I
SENSE1–
V
SENSE1
TSNS1
2200pF
I
TH1
10nF
4.99k
530µF
+
+
530µF
SOME DETAILS OMITTED
FOR CLARITY
PMBus
INTERFACE
TO/FROM
OTHER LTC DEVICES
WRITE PROTECT
SDA
GPIO0
SCL
GPIO1
ALERT
RUN0
V
DD33
RUN1
V
DD25
SHARE_CLK
SYNC
SGND
WP
FAULT MANAGEMENT
1µF
1µF
3880 TA01a
Rev. H
Document Feedback
For more information
www.analog.com
1
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 V
OUT
and I
OUT
Faults ........................ 28
Output Overvoltage Fault Response ................... 28
Output Undervoltage Response ......................... 28
Peak Output Overcurrent Fault Response ........... 28
Responses to Timing Faults ....................................29
Responses to V
IN
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 I
2
C
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
I
SENSE+
and I
SENSE–
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
INTV
CC
Regulator.................................................... 47
Topside MOSFET Driver Supply (C
B
, D
B
) ................48
Undervoltage Lockout.............................................48
C
IN
and C
OUT
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
LTC3880/LTC3880-1
TABLE OF CONTENTS
RCONFIG (External Resistor
Configuration Pins) ................................................. 51
Voltage Selection ................................................ 51
Frequency and Phase Selection Using RCONFIG 52
Address Selection Using RCONFIG .....................53
Efficiency Considerations .......................................54
Checking Transient Response .................................55
PC Board Layout Checklist .....................................56
PC Board Layout Debugging ...................................58
Design Example ...................................................... 59
Connecting the USB to the I
2
C/SMBus/PMBus
Controller to the LTC3880 In System ...................... 61
LTpowerPlay: An Interactive GUI for Digital Power .62
PMBus Communication and Command Processing 63
PMBus Command Details ............................... 65
Addressing and Write Protect .................................65
General Configuration Registers ............................. 67
On/Off/Margin ........................................................68
PWM Config ........................................................... 70
Voltage.................................................................... 72
Input Voltage and Limits..................................... 72
Output Voltage and Limits .................................. 73
Current.................................................................... 76
Input Current Calibration ................................... 76
Output Current Calibration ................................. 76
Input Current ...................................................... 76
Output Current....................................................77
Temperature............................................................ 78
External Temperature Calibration........................ 78
External Temperature Limits............................... 79
Timing ....................................................................80
Timing—On Sequence/Ramp.............................80
Timing—Off Sequence/Ramp ............................ 81
Precondition for Restart ..................................... 81
Fault Response .......................................................82
Fault Responses All Faults ..................................82
Fault Responses Input Voltage ...........................82
Fault Responses Output Voltage .........................83
Fault Responses Output Current .........................86
Fault Responses IC Temperature ........................ 87
Fault Responses External Temperature...............88
Fault Sharing...........................................................89
Fault Sharing Propagation ..................................89
Fault Sharing Response ...................................... 91
Scratchpad ............................................................. 91
Identification ...........................................................92
Fault Warning and Status........................................93
Telemetry .............................................................. 100
NVM Memory Commands .................................... 103
Store/Restore ................................................... 103
Fault Log Operation .......................................... 104
Fault Logging .................................................... 104
Block Memory Write/Read................................ 109
Typical Applications .................................... 111
Package Description ................................... 116
Revision History ........................................ 117
Typical Application ..................................... 118
Related Parts ............................................ 118
Rev. H
For more information
www.analog.com
3
LTC3880/LTC3880-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
Voltage ................................................. –0.3V to 28V
Topside Driver Voltages
BOOST1, BOOST0 .................................. –0.3V to 34V
Switch Voltage (SW1, SW0) .......................... –5V to 28V
EXTV
CC
, INTV
CC
, (BOOST1 – SW1),
(BOOST0 – SW0) ......................................... –0.3V to 6V
V
SENSE0+
, V
SENSE1
, I
SENSE0n
, I
SENSE1n
.......... –0.3V to 6V
RUN0, RUN1, SDA, SCL,
ALERT
................ –0.3V to 5.5V
FREQ_CFG, V
OUTn_CFG
, V
TRIMn_CFG
,
ASEL, V
DD25
............................................ –0.3V to 2.75V
V
DD33
,
GPIO0, GPIO1,
TSNS0, TSNS1, V
SENSE0 –
,
SHARE_CLK, WP, SYNC, ITHn ................. –0.3V to 3.6V
INTV
CC
Peak Output Current ................................100mA
Operating Junction Temperature Range
(Note 2)................................................ –40°C to 125°C*
Storage Temperature Range ................ –65°C to 150°C*
*See Derating EEPROM Retention at Temperature in Applications Informa-
tion section for junction temperatures in excess of 125°C.
PIN CONFIGURATION
LTC3880
TSNS0
TOP VIEW
BOOST0
BOOST1
INTV
CC
PGND
SW0
BG0
BG1
TG0
V
IN
LTC3880-1
TSNS0
TOP VIEW
BOOST0
BOOST1
30 TG1
29 SW1
28 TSNS1
27 V
SENSE1
41
SGND
26 I
TH1
25 V
DD33
24 SHARE_CLK
23 WP
22 V
DD25
21 V
TRIM1_CFG
11 12 13 14 15 16 17 18 19 20
ALERT
GPIO0
GPIO1
RUN0
RUN1
ASEL
FREQ_CFG
V
OUT0_CFG
V
OUT1_CFG
V
TRIM0_CFG
EXTV
CC
PGND
SW0
BG0
BG1
TG0
V
IN
40 39 38 37 36 35 34 33 32 31
V
SENSE0+
1
V
SENSE0–
2
I
SENSE1
I
SENSE1
+
–
40 39 38 37 36 35 34 33 32 31
30 TG1
29 SW1
28 TSNS1
27 V
SENSE1
26 I
TH1
25 V
DD33
24 SHARE_CLK
23 WP
22 V
DD25
21 V
TRIM1_CFG
V
SENSE0+
1
V
SENSE0–
2
I
SENSE1+
3
I
SENSE1–
4
I
TH0
5
I
SENSE0+
6
I
SENSE0–
7
SYNC 8
SCL 9
SDA 10
3
4
41
SGND
I
TH0
5
I
SENSE0+
6
I
SENSE0
–
7
SYNC 8
SCL 9
SDA 10
11 12 13 14 15 16 17 18 19 20
ALERT
GPIO0
GPIO1
RUN0
RUN1
ASEL
FREQ_CFG
V
OUT0_CFG
V
OUT1_CFG
V
TRIM0_CFG
UJ PACKAGE
40-LEAD (6mm
×
6mm) PLASTIC QFN
UJ PACKAGE
40-LEAD (6mm
×
6mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 33°C/W,
θ
JC
= 2.5°C/W
EXPOSED PAD (PIN 41) IS SGND, MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 33°C/W,
θ
JC
= 2.5°C/W
EXPOSED PAD (PIN 41) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3880EUJ#PBF
LTC3880IUJ#PBF
LTC3880EUJ-1#PBF
LTC3880IUJ-1#PBF
TAPE AND REEL
LTC3880EUJ#TRPBF
LTC3880IUJ#TRPBF
LTC3880EUJ-1#TRPBF
LTC3880IUJ-1#TRPBF
PART MARKING*
LTC3880UJ
LTC3880UJ
LTC3880UJ-1
LTC3880UJ-1
PACKAGE DESCRIPTION
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
JUNCTION TEMPERATURE RANGE
–40°C to 105°C
–40°C to 125°C
–40°C to 105°C
–40°C to 125°C
Rev. H
4
For more information
www.analog.com
LTC3880/LTC3880-1
ORDER INFORMATION
LEAD FREE FINISH
LTC3880EUJ#WPBF
LTC3880IUJ#WPBF
LTC3880EUJ-1#WPBF
LTC3880IUJ-1#WPBF
TAPE AND REEL
LTC3880EUJ#WTRPBF
LTC3880IUJ#WTRPBF
LTC3880EUJ-1#WTRPBF
LTC3880IUJ-1#WTRPBF
PART MARKING*
LTC3880UJ
LTC3880UJ
LTC3880UJ-1
LTC3880UJ-1
PACKAGE DESCRIPTION
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
JUNCTION TEMPERATURE RANGE
–40°C to 105°C
–40°C to 125°C
–40°C to 105°C
–40°C to 125°C
AUTOMOTIVE PRODUCTS**
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions
of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
ELECTRICAL CHARACTERISTICS
SYMBOL
Input Voltage
V
IN
I
Q
V
UVLO
t
INIT
Control Loop
V
OUT1R0
Full-Scale Voltage Range 0
Set Point Accuracy (0.6V to 5V)
Resolution
LSB Step Size
Full-Scale Voltage Range 1
Set Point Accuracy (0.6V to 2.5V)
Resolution
LSB Step Size
Full-Scale Voltage Range 0
Set Point Accuracy (0.6V to 4.096V)
Resolution
LSB Step Size
Full-Scale Voltage Range 1
Set Point Accuracy (0.6V to 2.5V)
Resolution
LSB Step Size
Line Regulation
Load Regulation
Input Voltage Range
Input Voltage Supply Current
Normal Operation
Undervoltage Lockout Threshold
when V
IN
> 4.3V
Initialization Time
PARAMETER
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) V
IN
= 12V, V
RUN0,1
= 3.3V, f
SYNC
= 500kHz (externally
driven) unless otherwise specified.
CONDITIONS
(Note 12)
(Note 14)
V
RUN0,1
= 3.3V, No Caps on TG and BG
V
RUN0,1
= 0V
V
INTVCC
/V
EXTVCC
Falling
V
INTVCC
/V
EXTVCC
Rising
Time from V
IN
Applied Until the TON_DELAY
Timer Starts
VOUT_COMMAND(1) = 5.500V (Note 9)
l
l
l
MIN
4.5
TYP
MAX
24
UNITS
V
mA
mA
V
V
ms
25
20
3.7
3.95
120
5.4
–0.5
12
1.375
5.6
0.5
V
%
Bits
mV
V
%
Bits
mV
V
%
Bits
mV
V
%
Bits
mV
%/V
%
%
V
OUT1R1
VOUT_COMMAND(1) = 2.75V (Note 9)
l
l
2.7
–0.5
12
0.6875
2.8
0.5
V
OUT0R0
VOUT_COMMAND(0) = 4.095V (Note 9)
l
l
4.0
–0.5
12
1.375
4.2
0.5
V
OUT0R1
VOUT_COMMAND(0) = 2.75V (Note 9)
l
l
2.7
–0.5
12
0.6875
0.01
–0.01
2.8
0.5
V
LINEREG
V
LOADREG
6V < V
IN
< 24V
∆V
ITH
= 1.35V – 0.7V
∆V
ITH
= 1.35V – 2.0V
l
l
l
±0.02
0.1
–0.1
Rev. H
For more information
www.analog.com
5
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LTC3880EUJ#TRPBF Related Products

LTC3880EUJ#TRPBF LTC3880IUJ#PBF LTC3880EUJ#PBF LTC3880EUJ#TRMPBF LTC3880EUJ-1#PBF LTC3880EUJ-1#TRPBF LTC3880IUJ#TRPBF LTC3880IUJ-1#PBF
Description DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP T/R DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP Tube DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP Tube DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP T/R DC/DC Cntrlr Dual-OUT Step Down 1000kHz 40-Pin QFN EP Tube DC/DC Cntrlr Dual-OUT Step Down 1000kHz 40-Pin QFN EP T/R DC/DC Cntrlr Dual-OUT Step Down 1000kHz Automotive 40-Pin QFN EP T/R DC/DC Cntrlr Dual-OUT Step Down 1000kHz 40-Pin QFN EP Tube
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Unconfirmed Active Active Active Active
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Number of Outputs 2 2 2 2 2 2 2 2
Topology Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down
Output Voltage (V) 0.5 to 5.5 0.5 to 5.5 0.5 to 5.5 0.5 to 5.5 0.5 to 5.5 0.5 to 5.5 0.5 to 5.5 0.5 to 5.5
Maximum Switching Frequency (kHz) 1000 1000 1000 1000 1000 1000 1000 1000
Minimum Input Voltage (V) 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5
Maximum Input Voltage (V) 24 24 24 24 24 24 24 24
Operating Supply Voltage (V) 4.5 to 24 4.5 to 24 4.5 to 24 4.5 to 24 4.5 to 24 4.5 to 24 4.5 to 24 4.5 to 24
Maximum Supply Current (mA) 25(Typ) 25(Typ) 25(Typ) 25(Typ) 25(Typ) 25(Typ) 25(Typ) 25(Typ)
Minimum Switching Frequency (kHz) 250 250 250 250 250 250 250 250
Synchronous Rectifier Yes Yes Yes Yes Yes Yes Yes Yes
Synchronous Clock Yes Yes Yes Yes Yes Yes Yes Yes
Control Method PWM PWM PWM PWM PWM PWM PWM PWM
Programmability Yes Yes Yes Yes Yes Yes Yes Yes
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 105 125 105 105 105 105 125 125
Supplier Temperature Grade Extended Industrial Extended Extended Extended Extended Industrial Industrial
Pin Count 40 40 40 40 40 40 40 40
Supplier Package QFN EP QFN EP QFN EP QFN EP QFN EP QFN EP QFN EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 6 6 6 6 6 6 6 6
Package Width 6 6 6 6 6 6 6 6
PCB changed 40 40 40 40 40 40 40 40
Lead Shape No Lead No Lead No Lead No Lead No Lead No Lead No Lead No Lead
Packaging Tape and Reel Tube Tube - Tube Tape and Reel Tape and Reel Tube
Standard Package Name QFN QFN QFN - QFN QFN QFN QFN

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