FEATURES
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LTM4643
Ultrathin Quad µModule
Regulator with Configurable
3A Output Array
DESCRIPTION
The
LTM
®
4643
is a quad DC/DC step-down µModule
(power module) regulator with 3A per output. Outputs can
be paralleled in an array for up to 12A capability. Included
in the package are the switching controllers, power FETs,
inductors and support components. Operating over an
input voltage range of 4V to 20V or 2.375V to 20V with
an external bias supply, the LTM4643 supports an output
voltage range of 0.6V to 3.3V each set by a single external
resistor. Its high efficiency design delivers 3A continuous
output current per channel. Only bulk input and output
capacitors are needed.
Fault protection features include overvoltage, overcurrent
and overtemperature protection. The LTM4643 is offered
in a 9mm ×15mm × 1.82mm LGA and 9mm × 15mm ×
2.42mm BGA packages with SnPb (BGA) or RoHS compli-
ant terminal finish.
Configurable Output Array*
3A
3A
3A
3A
* Note 4
6A
3A
3A
9A
3A
12A
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Quad Output Step-Down µModule
®
Regulator with
3A per Output
Wide Input Voltage Range: 4V to 20V
n
2.375V to 20V with External Bias
0.6V to 3.3V Output Voltage
3A DC Output Current Each Channel
±1.5% Total Output Voltage Regulation
Current Mode Control, Fast Transient Response
Parallelable for Higher Output Current
Output Voltage Tracking
Internal Temperature Sensing Diode Output
External Frequency Synchronization
Overvoltage, Current and Temperature Protection
9mm × 15mm × 1.82mm LGA and 9mm × 15mm ×
2.42mm BGA Packages
APPLICATIONS
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FPGAs, GPUs and ASICs Applications
PCIe and Backside PCB Mounting
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
4V to 20V Input, Quad 0.9V, 1V, 1.2V and
1.5V Output DC/DC µModule Regulator
4V to 20V
V
IN1
SVIN1
RUN1
V
IN2
SVIN2
RUN2
V
IN3
SVIN3
RUN3
V
IN4
SVIN4
RUN4
TEMP
NOT ALL PINS
ARE SHOWN
SGND
CLKIN
CLKOUT
V
OUT1
FB1
PGOOD1
V
OUT2
FB2
PGOOD2
V
OUT3
FB3
PGOOD3
V
OUT4
FB4
PGOOD4
GND
4643 TA01a
1.5V Output Efficiency and
Power Loss (Each Channel)
1.5V/3A
95
90
85
EFFICIENCY (%)
1.6
1.4
1.2
POWER LOSS (W)
1.0
0.8
0.6
0.4
V
IN
= 5V
V
IN
= 12V
0
0.5
1
1.5
2
LOAD CURRENT (A)
2.5
3
0.2
0.0
22µF
×2
25V
40.2k
47µF
4V
1.2V/3A
LTM4643
47µF
4V
1V/3A
90.9k
47µF
4V
0.9V/3A
121k
47µF
4V
80
75
70
65
60
55
60.4k
4643 TA01b
Document Feedback
For more information
www.analog.com
1
Rev C
LTM4643
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V
IN1
V
IN
, SV
IN
(Per Channel).............................. –0.3V to 22V
V
OUT
(Per Channel) (Note 3) ............–0.3V to SV
IN
or 6V
RUN (Per Channel) ..................................... –0.3V to 22V
INTV
CC
(Per Channel) ............................... –0.3V to 3.6V
PGOOD, MODE, TRACK/SS,
FB (Per Channel) ................................... –0.3V to INTV
CC
CLKOUT (Note 3), CLKIN....................... –0.3V to INTV
CC
Internal Operating Temperature Range
(Notes 2, 5) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Peak Solder Reflow Body Temperature ................. 260°C
TRACK/SS1
4
GND
1
A
GND
2
V
OUT1
3
5
6
7
FB1
B
C
V
OUT2
PGOOD2 PGOOD1 INTV
CC1
COMP1
CLKIN
SV
IN1
MODE1
RUN1
TRACK/SS2
D
GND
FB2
COMP2
SGND
PGOOD3 TEMP
INTV
CC2
E
V
IN2
V
OUT3
GND
V
IN3
V
OUT4
GND
SV
IN2
MODE2
RUN2
F
G
H
INTV
CC3
TRACK/SS3
FB3
COMP3
FB4
SV
IN3
MODE3
RUN3
TRACK/SS4
RUN4
INTV
CC4
COMP4
J
PGOOD4 CLKOUT
K
L
V
IN4
SV
IN4
MODE4
LGA PACKAGE (WEIGHT = 0.70g)
77-LEAD (9mm × 15mm × 1.82mm)
BGA PACKAGE (WEIGHT = 0.83g)
77-LEAD (9mm × 15mm × 2.42mm)
T
JMAX
= 125°C,
θ
JCtop
= 17°C/W,
θ
JCbottom
= 2.75°C/W,
θ
JB
+
θ
BA
= 11°C/W,
θ
JA
= 10°C/W
θ
VALUES PER JESD 51-12
ORDER INFORMATION
PART NUMBER
LTM4643EV#PBF
LTM4643IV#PBF
LTM4643MPV#PBF
LTM4643EY#PBF
LTM4643IY#PBF
LTM4643MPY#PBF
LTM4643IY
LTM4643MPY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SnPb (63/37)
http://www.linear.com/product/LTM4643#orderinfo
PART MARKING*
DEVICE
LTM4643V
LTM4643V
LTM4643V
LTM4643Y
LTM4643Y
LTM4643Y
LTM4643Y
LTM4643Y
FINISH CODE
e4
e4
e4
e1
e1
e1
e0
e0
PACKAGE
TYPE
LGA
LGA
LGA
BGA
BGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
3
3
3
TEMPERATURE RANGE
(SEE NOTE 2)
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–55°C to 125°C
Consult Marketing for parts specified with wider operating temperature
ranges. *Device temperature grade is indicated by a label on the shipping
container. Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal Finish Part Markings:
www.linear.com/leadfree
• Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
• Package and Tray Drawings:
www.linear.com/packaging
2
Rev C
For more information
www.analog.com
LTM4643
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
, SV
IN
V
OUT(RANGE)
V
OUT(DC)
V
RUN
I
Q(SVIN)
I
S(VIN)
I
OUT(DC)
ΔV
OUT
(Line)/V
OUT
V
OUT(AC)
ΔV
OUT(START)
t
START
ΔV
OUTLS
t
SETTLE
I
OUTPK
V
FB
I
FB
R
FBHI
I
TRACK/SS
V
IN(UVLO)
t
ON(MIN)
t
OFF(MIN)
V
PGOOD
I
PGOOD
V
PGL
V
INTVCC
V
INTVCC
Load Reg
f
OSC
CLKIN
PARAMETER
Input DC Voltage
Output Voltage Range
Output Voltage, Total Variation
with Line and Load
RUN Pin On Threshold
Input Supply Bias Current
Switching Regulator Section: per Channel
SV
IN
= V
IN
l
l
The
l
denotes the specifications which apply over the specified internal
operating junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, per the typical application.
CONDITIONS
MIN
4
0.6
1.477
1.1
1.50
1.2
6
2
11
0.45
0
l
l
TYP
MAX
20
3.3
1.523
1.3
UNITS
V
V
V
V
mA
mA
µA
A
C
IN
= 22µF, C
OUT
= 100µF Ceramic, R
FB
= 40.2k,
MODE = INTV
CC
,V
IN
= 4V to 20V, I
OUT
= 0A to 3A (Note 4)
l
V
RUN
Rising
V
IN
= 12V, V
OUT
= 1.5V, MODE = INTV
CC
V
IN
= 12V, V
OUT
= 1.5V, MODE = GND
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 3A
Input Supply Current
Output Continuous Current Range V
IN
= 12V, V
OUT
= 1.5V (Note 4)
Line Regulation Accuracy
V
OUT
= 1.5V, V
IN
= 4V to 20V, I
OUT
= 0A
V
OUT
= 1.5V, I
OUT
= 0A to 3A
I
OUT
= 0A, C
OUT
= 100µF Ceramic, V
IN
= 12V,
V
OUT
= 1.5V
I
OUT
= 0A, C
OUT
= 100µF Ceramic, V
IN
= 12V,
V
OUT
= 1.5V
C
OUT
= 100µF Ceramic, No Load, TRACK/SS = 0.01µF,
V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load, C
OUT
= 47µF
Ceramic, V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load, C
OUT
= 47µF
Ceramic, V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 12V, V
OUT
= 1.5V
I
OUT
= 0A, V
OUT
= 1.5V, –40°C to 125°C
(Note 3)
Output Ripple Voltage
Turn-On Overshoot
Turn-On Time
Peak Deviation for Dynamic Load
Settling Time for Dynamic Load
Step
Output Current Limit
Voltage at FB Pin
Current at FB Pin
Resistor Between V
OUT
and FB
Pins
Track Pin Soft-Start Pull-Up
Current
V
IN
Undervoltage Lockout
Minimum On-Time
Minimum Off-Time
PGOOD Trip Level
TRACK/SS = 0V
V
IN
Falling
V
IN
Hysteresis
(Note 3)
(Note 3)
V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
I
PGOOD
= 1mA
SV
IN
= 4V to 20V
I
CC
= 0mA to 20mA
3
0.01
0.5
5
30
2.5
160
40
0.05
1.0
A
%/V
%
mV
mV
ms
mV
µs
A
ΔV
OUT
(Load)/V
OUT
Load Regulation Accuracy
3.5
l
5
0.60
60.40
2.5
0.607
±30
60.75
4
2.8
0.593
60.05
V
nA
kΩ
µA
V
mV
ns
ns
2.4
2.6
350
40
70
–13
7
–10
10
0.02
–7
13
2
0.1
3.4
%
%
µA
V
V
%
MHz
V
PGOOD Leakage
PGOOD Voltage Low
Internal V
CC
Voltage
INTV
CC
Load Regulation
Oscillator Frequency
CLKIN Threshold
3.1
3.3
0.5
1.2
0.7
For more information
www.analog.com
3
Rev C
LTM4643
ELECTRICAL CHARACTERISTICS
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTM4643 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4643E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the full –40°C to 125°C internal operating temperature range are
assured by design, characterization and correlation with statistical process
controls. The LTM4643I is guaranteed to meet specifications over the full
–40°C to 125°C internal operating temperature range. The LTM4643MP
is guaranteed to meet specifications over the full –55°C to 125°C internal
operating temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors.
Note 3:
100% tested at wafer level.
Note 4:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current from
5V
IN
(One Channel Operating)
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
0
0.5
2
1
1.5
OUTPUT CURRENT (A)
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1.0V
OUT
2.5
3
4643 G01
(Per Channel)
DCM Mode Efficiency from
1.5V
OUT
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
3
4643 G02
Efficiency vs Load Current from
12V
IN
(One Channel Operating)
95
90
85
80
75
70
65
60
55
0
0.5
2
1
1.5
OUTPUT CURRENT (A)
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1.0V
OUT
2.5
0
0.001
5V
IN
12V
IN
0.1
1
0.01
LOAD CURRENT (A)
10
4643 G03
1.0V Output Transient Response
1.2V Output Transient Response
1.5V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
4643 G04
V
IN
= 12V
20µs/DIV
V
OUT
= 1.0V
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
V
OUT
50mV/DIV
AC-COUPLED
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
4643 G05
V
IN
= 12V
20µs/DIV
V
OUT
= 1.2V
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
4643 G06
V
IN
= 12V
20µs/DIV
V
OUT
= 1.5V
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
LOAD STEP
1A/DIV
4
Rev C
For more information
www.analog.com
LTM4643
TYPICAL PERFORMANCE CHARACTERISTICS
1.8V Output Transient Response
2.5V Output Transient Response
3.3V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
4643 G07
V
IN
= 12V
20µs/DIV
V
OUT
= 1.8V
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
4643 G08
V
IN
= 12V
20µs/DIV
V
OUT
= 2.5V
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
LOAD STEP
1A/DIV
4643 G09
V
IN
= 12V
20µs/DIV
V
OUT
= 3.3V
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
Start-Up with No Load Applied
Start-Up with 3A Load Applied
Short-Circuit with No Load
Applied
I
IN
0.5A/DIV
I
IN
0.5A/DIV
I
IN
0.5A/DIV
V
OUT
0.5V/DIV
V
OUT
0.5V/DIV
4643 G10
V
IN
= 12V
5ms/DIV
V
OUT
= 1.5V
INPUT CAPACITOR = 1
×
22µF CERAMIC CAP
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
SOFT START = 0.1µF
V
OUT
0.5V/DIV
4643 G11
V
IN
= 12V
5ms/DIV
V
OUT
= 1.5V
INPUT CAPACITOR = 1
×
22µF CERAMIC CAP
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
SOFT START = 0.1µF
4643 G12
5ms/DIV
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 1
×
22µF CERAMIC CAP
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
Short-Circuit with 3A Load
Applied
I
IN
0.5A/DIV
V
OUT
0.5V/DIV
I
IN
0.5A/DIV
V
OUT
0.5V/DIV
Short-Circuit with 3A Load
Applied
Output Ripple
V
OUT
5mV/DIV
AC-COUPLED
350kHz
BANDWIDTH
4643 G13
V
IN
= 12V
20µs/DIV
V
OUT
= 1.5V
INPUT CAPACITOR = 1
×
22µF CERAMIC CAP
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
4643 G14
V
IN
= 12V
20µs/DIV
V
OUT
= 1.5V
INPUT CAPACITOR = 1
×
22µF CERAMIC CAP
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
4643 G15
2µs/DIV
V
IN
= 12V
V
OUT
= 1.5V
OUTPUT CAPACITOR = 2
×
47µF CERAMIC CAP
For more information
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5
Rev C
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