FeaTures
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LTM4631
Ultrathin Dual 10A or Single 20A
DC/DC µModule Regulator
DescripTion
The
LTM
®
4631
is a dual 10A or single 20A output switch-
ing mode step-down DC/DC µModule
®
(power module)
regulator. Included in the package are the switching con-
troller, power FETs, inductors and all supporting compo-
nents. Operating from an input voltage range of 4.5V to
15V, the LTM4631 supports two outputs each with an
output voltage range of 0.6V to 1.8V, each set by a single
external resistor. Its high efficiency design delivers up to
10A continuous current for each output. Only a few input
and output capacitors are needed.
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing and has an onboard
temperature diode for device temperature monitoring.
High switching frequency and a current mode architec-
ture enable a very fast transient response to line and load
changes without sacrificing stability.
Fault protection features include overvoltage and
overcurrent protection. The LTM4631 is offered in an
ultrathin 16mm
×
16mm
×
1.91mm LGA and 16mm
×
16mm
×
2.51mm BGA packages. The LTM4631 is avail-
able with SnPb (BGA) or ROHS compliant terminal finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase
are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678,
6144194, 6177787, 6304066 and 6580258. Other patents pending.
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Dual 10A or Single 20A Output
Input Voltage Range: 4.5V to 15V
Output Voltage Range: 0.6V to 1.8V
±1.5% Maximum Total DC Output Error Over Line,
Load and Temperature
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Adjustable Switching Frequency
Overcurrent Foldback Protection
Multiphase Parallel Current Sharing with Multiple
LTM4631s
Frequency Synchronization
Internal Temperature Monitor
Selectable Burst Mode
®
Operation
Soft-Start/Voltage Tracking
Output Overvoltage Protection
Ultrathin 16mm
×
16mm
×
1.91mm LGA and
16mm
×
16mm
×
2.51mm BGA Packages
applicaTions
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Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
Typical applicaTion
20A, 1.2V Output Ultrathin µModule Regulator
INTV
CC
4.7µF
10k
PGOOD
85
90
1.2V Output Efficiency
vs Load Current
22µF
25V
×4
120k
TEMP
TRACK1
TRACK2
LTM4631
V
OUTS1
DIFFOUT
V
FB1
V
FB2
DIFFP
V
OUT2
PGOOD2
PGOOD
GND
DIFFN
100µF
6.3V
+
EFFICIENCY (%)
V
IN
4.5V TO 15V
MODE_PLLIN
V
IN
INTV
CC
PGOOD1
V
OUT1
470µF
6.3V
80
75
60.4k
70
V
OUT
1.2V
20A
470µF
6.3V
4631 TA01a
0.1µF
PINS NOT USED IN THIS CIRCUIT:
CLKOUT
EXTV
CC
SW1
SW2
V
OUTS2
f
SET
PHASMD
147k
SGND
5V INPUT
12V INPUT
65
0
2
4
6
LOAD CURRENT (A)
8
10
3060 TA01b
+
100µF
6.3V
4631fb
For more information
www.linear.com/LTM4631
1
LTM4631
absoluTe MaxiMuM raTings
(Note 1)
V
IN
..............................................................–0.3V to 16V
V
SW1
, V
SW2
....................................................–1V to 16V
PGOOD1, PGOOD2, RUN1, RUN2,
INTV
CC
, EXTV
CC
.......................................... –0.3V to 6V
MODE_PLLIN, f
SET
, TRACK1, TRACK2,
DIFFOUT, PHASMD ............................... –0.3V to INTV
CC
V
OUT1
, V
OUT2
, V
OUTS1
, V
OUTS2
(Note 6) ........ –0.3V to 6V
DIFFP, DIFFN ......................................... –0.3V to INTV
CC
COMP1, COMP2, V
FB1
, V
FB2
(Note 6) ........ –0.3V to 2.7V
INTV
CC
Peak Output Current ................................100mA
Internal Operating Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Peak Package Body Temperature .......................... 245°C
pin conFiguraTion
TOP VIEW
TEMP
M
L
K
J
TOP VIEW
TEMP
M
L
K
J
EXTV
CC
EXTV
CC
CLKOUT
SW1
PHASMD
MODE_PLLIN
TRACK1
V
FB1
V
OUTS1
H
G
RUN1
F
SGND
GND
E
D
C
B
A
1
2
3
4
5
COMP1 COMP2
SGND V
FB2
TRACK2
f
SET
SGND V
OUTS2
GND
INTV
CC
SW2
PGOOD1
PGOOD2
RUN2
DIFFOUT
DIFFP
DIFFN
CLKOUT
SW1
PHASMD
MODE_PLLIN
TRACK1
V
FB1
V
OUTS1
H
G
RUN1
F
SGND
GND
E
D
C
B
A
COMP1 COMP2
SGND V
FB2
TRACK2
f
SET
SGND V
OUTS2
GND
INTV
CC
SW2
PGOOD1
PGOOD2
RUN2
DIFFOUT
DIFFP
DIFFN
V
OUT1
GND
6
7
8
9
V
OUT2
V
OUT1
GND
4
5
6
7
8
9
V
OUT2
10
11
12
1
2
3
10
11
12
LGA PACKAGE
144-LEAD (16mm
×
16mm
×
1.91mm)
BGA PACKAGE
144-LEAD (16mm
×
16mm
×
2.51mm)
T
JMAX
= 125°C,
θ
JA
= 7°C/W,
θ
JCbottom
= 1.5°C/W,
θ
JCtop
= 3.7°C/W,
θ
JB
+
θ
JBA
≅
7°C/W
θ
VALUES DEFINED PER JESD 51-12
WEIGHT = 1.35g
T
JMAX
= 125°C,
θ
JA
= 7°C/W,
θ
JCbottom
= 1.5°C/W,
θ
JCtop
= 3.7°C/W,
θ
JB
+
θ
JBA
≅
7°C/W
θ
VALUES DEFINED PER JESD 51-12
WEIGHT = 1.54g
2
4631fb
For more information
www.linear.com/LTM4631
LTM4631
orDer inForMaTion
PART NUMBER
LTM4631EV#PBF
LTM4631IV#PBF
LTM4631EY#PBF
LTM4631IY#PBF
LTM4631IY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM4631#orderinfo
PART MARKING*
DEVICE
LTM4631V
LTM4631V
LTM4631Y
LTM4631Y
LTM4631Y
FINISH CODE
e4
e4
e1
e1
e0
PACKAGE
TYPE
LGA
LGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
TEMPERATURE RANGE
(Note 2)
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°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 Marking:
www.linear.com/leadfree
•
Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
•
LGA and BGA Package and Tray Drawings:
www.linear.com/packaging
elecTrical characTerisTics
SYMBOL
V
IN
V
OUT
V
OUT1(DC)
,
V
OUT2(DC)
Input Specifications
V
RUN1
, V
RUN2
I
INRUSH(VIN)
I
Q(VIN)
RUN Pin On/Off Threshold
Input Inrush Current at Start-Up
PARAMETER
Input DC Voltage
Output Voltage
Output Voltage, Total Variation with
Line and Load
The
l
denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted. Per the typical application in Figure 23.
CONDITIONS
l
l
MIN
4.5
0.6
1.477
TYP
MAX
15
1.8
UNITS
V
V
V
C
IN
= 22µF
×
3, C
OUT
= 100µF
×
1 Ceramic,
470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 0A to 10A
RUN Rising
I
OUT
= 0A, C
IN
= 22µF
×3,
C
SS
= 0.01µF,
C
OUT
= 100µF
×3,
V
OUT1
= 1.5V, V
OUT2
= 1.5V,
V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, Burst Mode Operation
V
IN
= 12V, V
OUT
= 1.5V, Pulse-Skipping Mode
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 10A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 10A
V
IN
= 12V, V
OUT
= 1.5V (Note 6)
V
OUT
= 1.5V, V
IN
from 4.5V to 15V
I
OUT
= 0A for Each Output,
For Each Output, V
OUT
= 1.5V, 0A to 10A
V
IN
= 12V (Note 6)
For Each Output, I
OUT
= 0A, C
OUT
= 100µF
×3/
X7R/Ceramic, 470µF POSCAP V
IN
= 12V,
,
V
OUT
= 1.5V, Frequency = 750kHz
V
IN
= 12V, V
OUT
= 1.5V, f
SET
= INTV
CC
(Note 4)
l
1.5
1.523
1.1
1.25
150
200
1.40
V
mV
mA
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis
Input Supply Bias Current
4
25
65
30
2.7
1.2
0
l
l
mA
mA
mA
µA
A
A
10
A
%/V
%
mV
P-P
kHz
780
kHz
I
S(VIN)
Output Specifications
I
OUT1(DC)
, I
OUT2(DC)
ΔV
OUT1(LINE)
/V
OUT1
ΔV
OUT2(LINE)
/V
OUT2
ΔV
OUT1
/V
OUT1
ΔV
OUT2
/V
OUT2
Input Supply Current
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
0.01
0.2
15
0.025
0.75
V
OUT1(AC)
, V
OUT2(AC)
Output Ripple Voltage
f
S
(Each Channel)
f
SYNC
(Each Channel)
Output Ripple Voltage Frequency
SYNC Capture Range
750
500
4631fb
For more information
www.linear.com/LTM4631
3
LTM4631
The
l
denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted. Per the typical application in Figure 23.
SYMBOL
ΔV
OUTSTART
(Each Channel)
t
START
(Each Channel)
ΔV
OUT(LS)
(Each Channel)
t
SETTLE
(Each Channel)
I
OUT(PK)
(Each Channel)
Control Section
V
FB1
, V
FB2
I
FB
V
OVL
TRACK1 (I),
TRACK2 (I)
UVLO
UVLO Hysteresis
t
ON(MIN)
R
FBHI1
, R
FBHI2
V
PGOOD1
, V
PGOOD2
Low
I
PGOOD
V
PGOOD
Minimum On-Time
Resistor Between V
OUTS1
, V
OUTS2
and V
FB1
, V
FB2
Pins for Each Output
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
I
PGOOD
= 2mA
V
PGOOD
= 5V
V
FB
with Respect to Set Output Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
6V < V
IN
< 15V
I
CC
= 0mA to 50mA
EXTV
CC
Ramping Positive
I
CC
= 20mA, V
EXTVCC
= 5V
4.5
4.8
–10
10
5
0.5
4.7
50
220
f
SET
= 1.2V
f
SET
= 0V (Note 4)
f
SET
> 2.4V, Up to INTV
CC
450
210
700
9
PHASMD = GND
PHASMD = Float
PHASMD = INTV
CC
2
500
250
780
10
250
60
90
120
0.8
550
290
860
11
100
5.2
2
(Note 5)
60.05
Feedback Overvoltage Lockout
Track Pin Soft-Start Pull-Up Current
Undervoltage Lockout (Falling)
TRACK1 (I),TRACK2 (I) Start at 0V
Voltage at V
FB
Pins
I
OUT
= 0A, V
OUT
= 1.5V
(Note 5)
l
l
elecTrical characTerisTics
PARAMETER
Turn-On Overshoot
Turn-On Time
CONDITIONS
,
C
OUT
= 100µF/X5R/Ceramic, 470µF POSCAP
V
OUT
= 1.5V, I
OUT
= 0A V
IN
= 12V
,
C
OUT
= 100µF/X5R/Ceramic, 470µF POSCAP
No Load, TRACK/SS with 0.01µF to GND,
V
IN
= 12V
Load: 0% to 50% to 0% of Full Load
C
OUT
= 22µF
×3/X5R/Ceramic,
470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load,
V
IN
= 12V, C
OUT
= 100µF, 470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
MIN
TYP
10
5
MAX
UNITS
mV
ms
Peak Deviation for Dynamic Load
30
mV
Settling Time for Dynamic Load
Step
Output Current Limit
20
13
µs
A
0.592
0.64
1
0.600
–5
0.66
1.3
3.3
0.6
90
60.4
0.1
0.606
–20
0.68
1.5
V
nA
V
µA
V
V
ns
60.75
0.3
±5
kΩ
V
µA
%
%
V
%
V
mV
mV
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
4631fb
INTV
CC
Linear Regulator
V
INTVCC
V
INTVCC
Load Regulation
V
EXTVCC
V
EXTVCC(DROP)
V
EXTVCC(HYST)
Internal V
CC
Voltage
INTV
CC
Load Regulation
EXTV
CC
Switchover Voltage
EXTV
CC
Dropout
EXTV
CC
Hysteresis
Oscillator and Phase-Locked Loop
Oscillator Frequency Medium Frequency
Lowest Frequency
Highest Frequency
f
SET
R
MODE_PLLIN
CLKOUT
Frequency Set Current
MODE_PLLIN Input Resistance
Phase (Relative to V
OUT1
)
Clock High Output Voltage
Clock Low Output Voltage
CLK High
CLK Low
4
For more information
www.linear.com/LTM4631
LTM4631
The
l
denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted. Per the typical application in Figure 23.
SYMBOL
Differential Amplifier
A
V
Differential
Amplifier
R
IN
V
OS
PSRR Differential
Amplifier
I
CL
V
OUT(MAX)
GBW
V
TEMP
TC
Gain
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain Bandwidth Product
Diode Connected PNP
Temperature Coefficient
I = 100µA
l
elecTrical characTerisTics
PARAMETER
CONDITIONS
MIN
TYP
1
MAX
UNITS
V/V
kΩ
Measured at DIFFP Input
V
DIFFP
= V
DIFFOUT
= 1.5V, I
DIFFOUT
= 100µA
5V < V
IN
< 15V
80
3
90
3
mV
dB
mA
V
MHz
V
mV/C
I
DIFFOUT
= 300µA
INTV
CC
– 1.4
3
0.6
–2.2
Note 3:
Two outputs are tested separately and the same testing condition
is applied to each output.
Note 4:
Although the switching frequency is programmable from 250kHz
to 750kHz, the LTM4631 device is designed to operate from 500kHz
to 750kHz for optimized inductor current ripple and efficiency. See the
Applications Information section.
Note 5:
These parameters are tested at wafer sort.
Note 6:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
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 LTM4631 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4631E is guaranteed to meet specifications from
0°C to 125°C internal temperature. Specifications over the –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM4631I is guaranteed over the full –40°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
impedance and other environmental factors.
4631fb
For more information
www.linear.com/LTM4631
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