FEATURES
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LTM4630
Dual 18A or Single 36A
DC/DC µModule Regulator
DESCRIPTION
The
LTM
®
4630
is a dual 18A or single 36A output switching
mode step-down DC/DC µModule
®
(micromodule) regula-
tor. Included in the package are the switching controllers,
power FETs, inductors, and all supporting components.
Operating from an input voltage range of 4.5V to 15V, the
LTM4630 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 18A continuous
current for each output. Only a few input and output ca-
pacitors are needed. The LTM4630 is pin compatible with
the LTM4620 and LTM4620A (dual 13A, single 26A) and
the LTM4628 (dual 8A, single 16A).
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 architecture enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include overvoltage and
overcurrent protection. The LTM4630 is offered in 16mm
×
16mm
×
4.41mm LGA and 16mm
×
16mm
×
5.01mm
BGA packages. The LTM4630 is ROHS compliant.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks of Linear Technology Corporation. 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 18A or Single 36A Output
Wide 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
LTM4630s Up to 144A
Frequency Synchronization
Internal Temperature Monitor
Pin Compatible with the LTM4620 and LTM4620A (Dual
13A, Single 26A) and LTM4628 (Dual 8A, Single 16A)
Selectable Burst Mode
®
Operation
Soft-Start/Voltage Tracking
Output Overvoltage Protection
16mm
×
16mm
×
4.41mm LGA and 16mm
×
16mm
×
5.01mm BGA Packages
Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
APPLICATIONS
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TYPICAL APPLICATION
36A, 1.2V Output DC/DC µModule Regulator
INTV
CC
4.7µF
10k
PGOOD
95
1.2V
OUT
Efficiency vs I
OUT
90
EFFICIENCY (%)
470µF
6.3V
85
80
75
70
V
IN
= 5V
V
IN
4.5V TO 15V
10k
22µF
25V
×4
MODE_PLLIN CLKOUT INTV
CC
V
IN
120k
TEMP
RUN1
RUN2
TRACK1
TRACK2
EXTV
CC
PGOOD1
V
OUT1
V
OUTS1
DIFFOUT
SW1
V
FB1
V
FB2
COMP1
COMP2
V
OUTS2
V
OUT2
SW2
PGOOD2
100µF
6.3V
PGOOD
60.4k
100µF
6.3V
+
V
IN
= 12V
5.1V
0.1µF
LTM4630
f
SET
PHASMD
121k
+
470µF
6.3V
V
OUT
1.2V
36A
65
0
2
4
6
8 10 12 14
OUTPUT CURRENT (A)
16
18
SGND
GND
DIFFP
DIFFN
4630 TA01b
4630 TA01a
4630fa
For more information
www.linear.com/LTM4630
1
LTM4630
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
(Note 8) ............................................... –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
EXTV
CC
M
TOP VIEW
TEMP
EXTV
CC
V
IN
L
K
J
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
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
GND
A
11
12
1
2
3
4
5
6
7
8
9
V
OUT2
10
LGA PACKAGE
144-LEAD (16mm
×
16mm
×
4.41mm)
10
11
12
BGA PACKAGE
144-LEAD (16mm
×
16mm
×
4.41mm)
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 = 3.2g
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 = 3.2g
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM4630EV#PBF
LTM4630IV#PBF
LTM4630EY#PBF
LTM4630IY#PBF
LTM4630IY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM4630V
LTM4630V
LTM4630Y
LTM4630Y
LTM4630Y
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
4630fa
2
For more information
www.linear.com/LTM4630
LTM4630
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
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
= 18A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 18A
V
IN
= 12V, V
OUT
= 1.5V (Note 7)
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 18A
V
IN
= 12V (Note 7)
For Each Output, I
OUT
= 0A, C
OUT
= 100µF ×3/
X7R/Ceramic, 470µF POSCAP V
IN
= 12V,
,
V
OUT
= 1.5V, Frequency = 450kHz
V
IN
= 12V, V
OUT
= 1.5V, f
SET
= 1.25V (Note 4)
400
,
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
10
5
l
l
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.
PARAMETER
Input DC Voltage
Output Voltage
Output Voltage, Total Variation with
Line and Load
C
IN
= 22µF
×
3, C
OUT
= 100µF
×
1 Ceramic,
470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 0A to 18A
CONDITIONS
l
l
l
MIN
4.5
0.6
1.477
TYP
MAX
15
1.8
UNITS
V
V
V
1.5
1.523
1.1
1.25
150
1
1.40
V
mV
A
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis
Input Supply Bias Current
3
15
65
50
6
2.6
0
0.01
0.5
15
18
0.025
0.75
mA
mA
mA
µA
A
A
A
%/V
%
mV
P-P
kHz
780
kHz
mV
ms
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
V
OUT1(AC)
, V
OUT2(AC)
Output Ripple Voltage
f
S
(Each Channel)
f
SYNC
(Each Channel)
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)
Feedback Overvoltage Lockout
Track Pin Soft-Start Pull-Up Current
Voltage at V
FB
Pins
Output Ripple Voltage Frequency
SYNC Capture Range
Turn-On Overshoot
Turn-On Time
500
Peak Deviation for Dynamic Load
30
mV
Settling Time for Dynamic Load
Step
Output Current Limit
20
30
µs
A
I
OUT
= 0A, V
OUT
= 1.5V
(Note 6)
l
0.592
0.64
1
0.600
–5
0.66
1.25
0.606
–20
0.68
1.5
V
nA
V
µA
4630fa
l
TRACK1 (I),TRACK2 (I) Start at 0V
For more information
www.linear.com/LTM4630
3
LTM4630
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
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 5)
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
0.2
1
Measured at DIFFP Input
V
DIFFP
= V
DIFFOUT
= 1.5V, I
DIFFOUT
= 100µA
5V < V
IN
< 15V
90
3
I
DIFFOUT
= 300µA
I = 100µA
l
ELECTRICAL CHARACTERISTICS
PARAMETER
Undervoltage Lockout (Falling)
CONDITIONS
MIN
TYP
3.3
0.6
MAX
UNITS
V
V
ns
(Note 6)
60.05
90
60.4
0.1
60.75
0.3
±5
kΩ
V
µA
%
%
INTV
CC
Linear Regulator
V
INTVCC
V
INTVCC
Load Regulation
V
EXTVCC
V
EXTVCC(DROP)
V
EXTVCC(HYST)
Frequency Nominal
Frequency Low
Frequency High
f
SET
R
MODE_PLLIN
CLKOUT
Internal V
CC
Voltage
INTV
CC
Load Regulation
EXTV
CC
Switchover Voltage
EXTV
CC
Dropout
EXTV
CC
Hysteresis
Nominal Frequency
Lowest Frequency
Highest Frequency
Frequency Set Current
MODE_PLLIN Input Resistance
Phase (Relative to V
OUT1
)
Clock High Output Voltage
Clock Low Output Voltage
Gain
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain Bandwidth Product
Diode Connected PNP
Temperature Coefficient
INTV
CC
– 1.4
3
0.6
–2.2
5.2
2
V
%
V
100
mV
mV
550
290
860
11
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
V/V
kΩ
3
mV
dB
mA
V
MHz
V
mV/C
Oscillator and Phase-Locked Loop
CLK High
CLK Low
Differential Amplifier
A
V
Differential
Amplifier
R
IN
V
OS
PSRR Differential
Amplifier
I
CL
V
OUT(MAX)
GBW
V
TEMP
TC
80
4630fa
4
For more information
www.linear.com/LTM4630
LTM4630
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 LTM4630 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4630E 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
LTM4630I 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.
Note 3:
Two outputs are tested separately and the same testing condition
is applied to each output.
Note 4:
The switching frequency is programmable from 400kHz to 750kHz.
Note 5:
LTM4630 device is designed to operate from 400kHz to 750kHz
Note 6:
These parameters are tested at wafer sort.
Note 7:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
TYPICAL PERFORMANCE CHARACTERISTICS
100
Efficiency vs Output Current,
V
IN
= 5V, f
S
= 450kHz
95
90
EFFICIENCY (%)
Efficiency vs Output Current,
V
IN
= 12V, f
S
= 450kHz
95
90
EFFICIENCY (%)
85
80
75
70
65
Dual Phase Single Output Efficiency
vs Output Current, V
IN
= 12V,
f
S
= 450kHz
95
EFFICIENCY (%)
85
80
75
70
65
V
OUT
= 1V
V
OUT
= 1.2V
V
OUT
= 1.5V
V
OUT
= 1.8V
0
2
4
6
8 10 12 14
LOAD CURRENT (A)
16
18
90
85
V
OUT
= 1V
V
OUT
= 1.2V
V
OUT
= 1.5V
V
OUT
= 1.8V
0
2
4
6
8 10 12 14
LOAD CURRENT (A)
16
18
80
75
V
OUT
= 1V
V
OUT
= 1.2V
V
OUT
= 1.5V
V
OUT
= 1.8V
0
5
10
15 20 25 30
LOAD CURRENT (A)
35
40
4630 G01
4630 G02
4630 G03
100
90
80
EFFICIENCY (%)
70
60
50
40
Burst Mode and Pulse-Skip Mode
Efficiency V
IN
=12V, V
OUT
= 1.2V,
f
S
= 450kHz
CCM
Burst Mode OPERATION
PULSE-SKIP MODE
V
OUT(AC)
50mV/Div
1V Single Phase Output Load
Transient Response
1.2V Single Phase Output Load
Transient Response
V
OUT(AC)
50mV/Div
LOAD STEP
2A/DIV
20µs/DIV
12V
IN
, 1V
OUT
, 450kHz, 4.5A LOAD STEP,
4.5A/µs STEP-UP AND STEP-DOWN
C
OUT
= 1 • 470µF 4V POSCAP + 1 • 100µF
6.3V CERAMIC
4630 G04
4630 G05
LOAD STEP
2A/DIV
20µs/DIV
12V
IN
, 1.2V
OUT
, 450kHz, 4.5A LOAD STEP,
4.5A/µs STEP-UP AND STEP-DOWN
C
OUT
= 1 • 470µF 4V POSCAP + 1 • 100µF
6.3V CERAMIC
4630 G06
30
0.01
0.1
1
10
LOAD CURRENT (A)
4630fa
For more information
www.linear.com/LTM4630
5
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