Dual 50A or Single 100A Digitally Adjustable Outputs with
Digital Interface for Control, Compensation and Monitoring
n
Wide Input Voltage: 4.5V to 16V
n
Output Voltage Range: 0.5V to 1.8V
n
~90% Full Load Efficiency from 12V to 1V
IN
OUT
at 100A
n
±0.5% Maximum DC Output Error Over Temperature
n
±3% Current Readback Accuracy (25°C to 125°C)
n
Integrated Input Current Sense Amplifier
n
400kHz PMBus-Compliant I
2
C Serial Interface
n
Supports Telemetry Polling Rates Up to 125Hz
n
Integrated 16-Bit ∆Σ ADC
n
Constant Frequency Current Mode Control
n
Parallel and Current Share Multiple Modules
n
15mm × 22mm × 7.87mm BGA Package
Readable Data:
n
Input and Output Voltages, Currents, and Temperatures
n
Running Peak Values, Uptime, Faults and Warnings
n
Internal EEPROM and Fault Logging with ECC
Writable Data and Configurable Parameters:
n
Output Voltage, Voltage Sequencing and Margining
n
Digital Soft-Start/Stop Ramp
n
Optimize Analog Loop Compensation
n
OV/UV/OT, UVLO, Frequency and Phasing
n
FEATURES
LTM4700
Dual 50A or Single 100A µModule Regulator
with Digital Power System Management
DESCRIPTION
The
LTM
®
4700
is a dual 50A or single 100A step-down
µModule
®
(power module) DC/DC regulator featuring
remote configurability and telemetry-monitoring of power
management parameters over PMBus—
an open standard
I
2
C-based digital interface protocol. The LTM4700 is
comprised of fast analog control loops, precision mixed-
signal circuitry, EEPROM, power MOSFETs, inductors and
supporting components. The LTM4700 product video is
available on website.
The LTM4700’s 2-wire serial interface allows outputs to
be margined, tuned and ramped up and down at program-
mable slew rates with sequencing delay times. Input and
output currents and voltages, output power, temperatures,
uptime and peak values are readable. Custom configura-
tion of the EEPROM contents is not required. At start-up,
output voltages, switching frequency, and channel phase
angle as-signments can be set by pin-strapping resistors.
The
LTpowerPlay
®
GUI and DC1613 USB-to-PMBus con-
verter and
demo kits
are available.
The LTM4700 is offered in a 15mm × 22mm × 7.87mm
BGA package available with SnPb or RoHS compliant
terminal finish.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258,
7420359, 8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide.
Click to view associated Video Design Idea.
APPLICATIONS
n
n
System Optimization, Characterization and Data Min-
ing in Prototype, Production and Field Environments
Telecom, Datacom, and Storage Systems
TYPICAL APPLICATION
Dual 50A µModule Regulator with Digital Interface
for Control and Monitoring*
V
IN
5.75V TO 16V
22µF
×8
V
IN0
V
IN1
SV
IN
RUN
0
RUN
1
V
OUT0
V
OSNS0
+
V
OSNS0–
LTM4700
V
OUT1
100
95
EFFICIENCY (%)
90
85
80
75
70
V
OUT0
,
ADJUSTABLE
UP TO 50A
220µF
LOAD
0
×8
V
OUT1
,
ADJUSTABLE
UP TO 50A
220µF
LOAD
1
×8
Efficiency vs Current at 12V Input
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
PWM CLOCK AND
TIME-BASE
SYNCHRONIZATION
REGISTER WRITE
PROTECTION
FAULT0
FAULT1
SYNC
SHARE_CLK
WP
V
OSNS1+
V
OSNS1–
SGND
SCL
SDA
ALERT
4700 TA01a
1.5V
OUT
1.0V
OUT
0
10
30
20
LOAD CURRENT (A)
40
50
4700 TA01b
GND
*FOR COMPLETE CIRCUIT, SEE FIGURE 46
I
2
C/SMBus I/F WITH
PMBus COMMAND SET
TO/FROM IPMI OR OTHER BOARD
MANAGEMENT CONTROLLER
Rev 0
Document Feedback
For more information
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1
LTM4700
TABLE OF CONTENTS
Features ..................................................... 1
Applications ................................................ 1
Typical Application ........................................ 1
Description.................................................. 1
Table of Contents .......................................... 2
Absolute Maximum Ratings .............................. 4
Order Information .......................................... 4
Pin Configuration .......................................... 4
Electrical Characteristics ................................. 5
Typical Performance Characteristics .................. 12
Pin Functions .............................................. 15
Simplified Block Diagram ............................... 19
Decoupling Requirements ............................... 19
Functional Diagram ...................................... 20
Test Circuits ............................................... 21
Operation................................................... 23
Power Module Introduction ....................................23
Power Module Overview, Major Features................23
EEPROM with ECC .................................................. 24
Power-Up and Initialization .....................................25
Soft-Start ................................................................26
Time-Based Sequencing .........................................26
Voltage-Based Sequencing .....................................26
Shutdown ............................................................... 27
Light-Load Current Operation ................................. 27
Switching Frequency and Phase ............................. 28
PWM Loop Compensation ...................................... 28
Output Voltage Sensing .......................................... 28
INTV
CC
and Build-in 5V Bias Converter .................. 28
Output Current Sensing and Sub Milliohm DCR
Current Sensing ......................................................29
Input Current Sensing .............................................29
PolyPhase Load Sharing .........................................29
External/Internal Temperature Sense ......................30
RCONFIG (Resistor Configuration) Pins ..................30
Fault Detection and Handling ..................................33
Status Registers and
ALERT
Masking .................34
Mapping Faults to
FAULT
Pins ............................36
Power Good Pins ................................................36
CRC Protection ...................................................36
Serial Interface .......................................................36
Communication Protection .................................36
Device Addressing ..................................................36
Responses to V
OUT
and I
IN
/I
OUT
Faults ................... 37
Output Overvoltage Fault Response ................... 37
Output Undervoltage Response ..........................38
Peak Output Overcurrent Fault Response ...........38
Responses to Timing Faults ....................................38
Responses to V
IN
OV Faults ....................................38
Responses to OT/UT Faults.....................................38
Internal Overtemperature Fault Response .........38
External Overtemperature and Undertemperature
Fault Response................................................39
Responses to Input Overcurrent and Output
Undercurrent Faults ................................................39
Responses to External Faults.................................. 39
Fault Logging .......................................................... 39
Bus Timeout Protection .......................................... 39
Similarity Between PMBus, SMBus and I
2
C 2-Wire
Interface .................................................................40
PMBus Serial Digital Interface ................................40
Figures 7 to 24 PMBus Protocols ........................... 42
PMBus Command Summary ............................ 45
PMBus Commands .................................................45
Applications Information ................................ 51
V
IN
to V
OUT
Step-Down Ratios ................................ 51
Input Capacitors ..................................................... 51
Output Capacitors ................................................... 51
Light Load Current Operation ................................. 51
Switching Frequency and Phase ............................. 52
Output Current Limit Programming ........................53
Minimum On-Time Considerations..........................54
Variable Delay Time, Soft-Start and Output Voltage
Ramping .................................................................54
Digital Servo Mode .................................................54
Soft Off (Sequenced Off) ........................................55
Undervoltage Lockout.............................................56
Fault Detection and Handling ..................................56
Open-Drain Pins .....................................................56
Phase-Locked Loop and Frequency Synchronization ....57
Input Current Sense Amplifier.................................58
Programmable Loop Compensation .......................58
Rev 0
2
For more information
www.analog.com
LTM4700
TABLE OF CONTENTS
Checking Transient Response ................................. 59
PolyPhase Configuration ....................................60
Connecting The USB to I
2
C/SMBus/PMBus Controller
to the LTM4700 In System......................................60
LTpowerPlay: An Interactive GUI for Digital Power . 61
PMBus Communication and Command Processing .... 61
Thermal Considerations and Output Current Derating ...63
Applications Information-Derating Curves ............ 69
EMI Performance .................................................... 70
Safety Considerations ............................................. 70
Layout Checklist/Example ...................................... 70
Typical Applications ...................................... 72
PMBus Command Details ............................... 77
Addressing and Write Protect .................................77
General Configuration Commands .......................... 79
On/Off/Margin ........................................................80
PWM Configuration ................................................82
Voltage....................................................................85
Input Voltage and Limits.....................................85
Output Voltage and Limits ..................................86
Output Current and Limits ......................................89
Input Current and Limits..................................... 91
Temperature............................................................92
External Temperature Calibration........................92
Timing ....................................................................93
Timing—On Sequence/Ramp.............................93
Timing—Off Sequence/Ramp ............................94
Precondition for Restart .....................................95
Fault Response .......................................................95
Fault Responses All Faults ..................................95
Fault Responses Input Voltage ...........................96
Fault Responses Output Voltage .........................96
Fault Responses Output Current .........................99
Fault Responses IC Temperature ...................... 100
Fault Responses External Temperature............. 101
Fault Sharing......................................................... 102
Fault Sharing Propagation ................................ 102
Fault Sharing Response .................................... 104
Scratchpad ........................................................... 104
Identification ......................................................... 105
Fault Warning and Status...................................... 106
Telemetry .............................................................. 112
NVM Memory Commands .................................... 116
Store/Restore ................................................... 116
Fault Logging .................................................... 117
Block Memory Write/Read................................ 121
Package Description ................................... 122
Typical Applications .................................... 124
Package Photograph ................................... 126
Related Parts ............................................ 126
Rev 0
For more information
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3
LTM4700
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
1
A
GND
GND
GND
GND
GND
GND
V
DD25
GND
GND
GND
GND
GND
GND
GND
GND TSNS1b
Terminal Voltages:
V
INn
(Note 4), SV
IN
, I
IN+
, I
IN−
...................... –0.3V to 18V
SW0, SW1 .................. −1V to 18V, −5V to 25V Transient
V
OUTn
........................................................ –0.3V to 3.6V
INTV
CC
, V
BIAS
.............................................. –0.3V to 6V
V
OSNS0+
, V
OSNS1+
......................................... –0.3V to 6V
V
OSNS0−
, V
OSNS1−
...................................... –0.3V to 0.3V
RUNn, SDA, SCL,
ALERT
........................... –0.3V to 5.5V
F
SWPH_CFG
, V
OUTn_CFG
, V
TRIMn_CFG
, ASEL ...–0.3V to 2.75V
FAULTn,
SYNC, SHARE_CLK, WP,
PGOOD0, PGOOD1.................................... −0.3V to 3.6V
(SV
IN
– IN
+
), (I
IN+
– I
IN –
) ......................... –0.3V to +0.3V
COMPna, COMPnb, .................................. –0.3V to 2.7V
TSNS0a, TSNS1a ...................................... –0.3V to 2.2V
TSNS0b, TSNS1b ...................................... –0.3V to 0.8V
RUNP ........................................................ –0.3V to SV
IN
Temperatures
Internal Operating Temperature Range
(Notes 2, 13, 17, 18) ............................... –40°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Peak Solder Reflow Package Body Temperature ... 245°C
2
3
4
5
6
7
8
9
GND
10
GND
11
GND
12
13
14
15
B
GND
C
D
E
F
SW1
V
IN1
GND
GND
GND
GND
V
OUT1
G
H
J
K
V
TRIM1_CFG
V
OUT1_CFG
ASEL
FAULT1 FAULT0
SDA
WP V
TRIM0_CFG
V
OUT0_CFG
FSWPH_CFG RUN0
ALERT
SHARE_CLK V
DD33
GND
COMP1a COMP1b
GND
SCL
RUN1 TSNS0a SYNC
TSNS1a GND
GND
GND
L
M
N
P
R
GND
V
OSNS1–
V
OSNS1+
GND
GND
PGOOD1 GND
GND
GND
GND
GND
INTV
CC
GND
GND
GND
GND
RUNP
GND
GND
SGND
GND
GND
GND
V
BIAS
GND
GND
GND
GND
GND
GND
COMP0b GND
GND COMP0a V
OSNS0–
GND
GND
GND
I
IN–
I
IN+
V
OSNS0+
PGOOD0
GND TSNS0b
T
U
V
W
Y
AA
AB
1
2
3
4
5
6
7
8
SW0
V
IN0
GND
SV
IN
GND
GND
GND
GND
V
OUT0
9
10
11
12
13
14
15
BGA PACKAGE
330-PIN (15mm
×
22mm
×
7.87mm)
T
JMAX
= 125°C,
θ
JCtop
= 3.1°C/W,
θ
JCbottom
= 1°C/W,
θ
JB
= 1.75°C/W,
θ
JA
= 8.5°C/W
θ
VALUES DETERMINED PER JESD51-12
WEIGHT = 9.5g
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM4700EY#PBF
LTM4700IY#PBF
LTM4700IY
PAD OR BALL FINISH
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM4700Y
LTM4700Y
LTM4700Y
FINISH CODE
e4
e0
PACKAGE
TYPE
BGA
BGA
MSL
RATING
4
4
TEMPERATURE RANGE
(SEE NOTE 2)
–40°C to 125°C
–40°C to 125°C
• Contact the factory for parts specified with wider operating temperature
ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures
•
LGA and BGA Package and Tray Drawings
Rev 0
4
For more information
www.analog.com
LTM4700
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2). Specified as each individual output channel (Note 4). T
A
= 25°C, V
IN
= 12V, RUNn = 3.3V,
FREQUENCY_SWITCH = 350kHz and V
OUTn
commanded to 1.000V unless otherwise noted. Configured with factory-default EEPROM
settings and per Test Circuit 1, unless otherwise noted.
SYMBOL
V
IN
V
OUTn
PARAMETER
Input DC Voltage
CONDITIONS
Test Circuit 1
Test Circuit 2; VIN_OFF < VIN_ON = 4V
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
5.75
4.5
0.5
0.5
TYP
MAX
16
5.75
1.8
1.8
UNITS
V
V
V
V
Range of Output Voltage Regulation V
OUT0
Differentially Sensed on V
OSNS0+
/V
OSNS0–
Pin-Pair;
V
OUT1
Differentially Sensed on V
OSNS1+
/V
OSNS1–
Pin-Pair;
Commanded by Serial Bus or with Resistors Present at
Start-Up on V
OUTn_CFG
Output Voltage, Total Variation with Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Line and Load
Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b)
V
OUTn
Commanded to 1.000V, V
OUTn
Low Range
(MFR_PWM_MODEn[1] = 1b) (Note 5)
Undervoltage Lockout Threshold,
When V
IN
< 4.3V
Input Inrush Current at
Start-Up
Input Supply Bias Current
V
INTVCC
Falling
V
INTVCC
Rising
Test Circuit 1, V
OUTn
=1V, V
IN
= 12V; No Load Besides
Capacitors; TON_RISE
n
= 3ms
Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b
RUNn = 3.3V
Shutdown, RUN0 = RUN1 = 0V
Pulse-Skipping Mode, MFR_PWM_MODEn[0] = 0b,
I
OUTn
= 100mA
Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b
I
OUTn
= 100mA
I
OUTn
= 50A
Shutdown, RUNn = 0V
(Note 6) Utilizing MFR_PWM_MODE[7] = 1 and Using
~I
OUT
= 50A, Page 90
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b)
SV
IN
and V
INn
Electrically Shorted Together and INTV
CC
Open Circuit; I
OUTn
= 0A, 5.0V ≤ V
IN
≤ 16V, V
OUT
Low Range
(MFR_PWM_MODEn[1] = 1b), FREQUENCY_SWITCH =
350kHz (Note 5)
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b)
0A ≤ I
OUTn
≤ 50A, V
OUT
Low Range, (MFR_PWM_
MODEn[1] = 1b) (Note 5)
FREQUENCY_SWITCH Set to 350kHz (0xFABC)
TON_RISEn = 3ms (Note 12)
Time from V
IN
Toggling from 0V to 12V to Rising Edge
PGOODn. TON_DELAYn = 0ms, TON_RISEn = 3ms
Time from First Rising Edge of RUNn to Rising Edge of
PGOODn . TON_DELAYn = 0ms, TON_RISEn = 3ms,
V
IN
Having Been Established for at Least 70ms
Load: 0A to 12.5A and 12.5A to 0A at 10A/µs,
V
OUTn
= 1V, V
IN
= 12V (Note 12)
V
OUTn(DC)
l
0.995
1.000
0.985 1.000
1.005
1.015
V
V
V
UVLO
3.55
3.90
100
V
V
mA
Input Specifications
I
INRUSH(VIN)
I
Q(SVIN)
I
S(VINn,PSM)
I
S(VINn,FCM)
50
25
20
mA
mA
mA
Input Supply Current in Pulse-
Skipping Mode Operation
Input Supply Current in Forced-
Continuous Mode Operation
110
5.8
500
0
0.03
0.3
50
mA
A
µA
A
%/V
%/V
I
S(VINn,SHUTDOWN)
Input Supply Current in Shutdown
Output Specifications
I
OUTn
∆V
OUTn(LINE)
V
OUTn
Output Continuous Current Range
Line Regulation Accuracy
l
0.5
∆V
OUTn(LOAD)
V
OUTn
V
OUTn(AC)
∆V
OUTn(START)
t
START
t
DELAY(0ms)
∆V
OUTn(LS)
Load Regulation Accuracy
l
0.03
0.2
0.75
%
%
Output Voltage Ripple
l
10
320
350
8
l
l
mV
P-P
370
kHz
mV
ms
3.75
ms
f
S
(Each Channel) V
OUTn
Ripple Frequency
Turn-On Overshoot
Turn-On Start-Up Time
Turn-On Delay Time
30
2.95
3.3
Peak Output Voltage Deviation for
Dynamic Load Step
55
mV
Rev 0
For more information
www.analog.com
5
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