FEATURES
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LTM4630A
Dual 18A or Single 36A
DC/DC µModule Regulator
DESCRIPTION
The
LTM
®
4630A
is a dual 18A or single 36A output switch-
ing mode step-down DC/DC µModule
®
(micromodule)
regulator with wider V
OUT
range and higher efficiency
than LTM4630. Included in the package are the switch-
ing controllers, power FETs, inductors and all supporting
components. Operating from an input voltage range of
4.5V to 18V, the LTM4630A supports two outputs each
with an output voltage range of 0.6V to 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 capacitors are needed. The LTM4630A
is pin compatible with the LTM4620 and LTM4620A (dual
13A, single 26A) and the LTM4630 (dual 18A, single 36A).
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 LTM4630A is offered in 16mm
×
16mm
×
4.41mm LGA and 16mm × 16mm × 5.01mm
BGA packages.
*Maximum V
IN
= 15V and V
OUT
= 5.3V with date code before 1720.
All registered trademarks and 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
Input Voltage Range: 4.5V to 18V (after date code
1720*)
Output Voltage Range: 0.6V to 8V (after date code
1720*)
±1.5% Maximum Total DC Output Error Over Line,
Load and Temperature
Higher Light Load Efficiency and Wider V
OUT
Range
Than LTM4630
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Multiphase Parallel Current Sharing Up to 144A
Internal Temperature Monitor
Pin Compatible with the LTM4620A (Dual 13A,
Single 26A) and LTM4630 (Dual 18A, Single 36A)
Adjustable Switching Frequency or Synchronization
Overcurrent Foldback Protection
Selectable Burst Mode
®
Operation, Pulse Skipping
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
V
IN
4.5V TO 15V
22µF
25V
×4
V
IN
120k
TEMP
TRACK1
TRACK2
0.1µF
75k
PINS UNUSED IN
THIS APPLICATION:
CLKOUT
EXTV
CC
SW1
SW2
V
OUTS2
RUN1
RUN2
PHASMD
SGND
GND
f
SET
LTM4630A
INTV
CC
PGOOD1
10k
PGOOD2
V
OUT1
V
OUTS1
DIFFOUT
V
FB1
V
FB2
COMP1
COMP2
V
OUT2
DIFFP
DIFFN
MODE_PLLIN
4630A TA01a
PGOOD
100
1.2V
OUT
and 3.3V
OUT
Efficiency vs I
OUT
EFFICIENCY (%)
100µF
6.3V
+
V
OUT
470µF
6.3V
95
90
85
80
75
12 V
IN
, 1.2V
OUT
, 300kHz
12 V
IN
, 3.3V
OUT
, 600kHz
5 V
IN
, 1.2V
OUT
, 300kHz
5 V
IN
, 3.3V
OUT
, 500kHz
0
2
4
8 10 12 14
6
LOAD CURRENT (A)
16
18
60.4k
100µF
6.3V
+
470µF
6.3V
70
65
4630A TA01b
4630afb
For more information
www.linear.com/LTM4630A
1
LTM4630A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
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
TOP VIEW
TEMP
M
L
K
J
V
IN
(Note 8)................................................ –0.3V to 20V
V
SW1
, V
SW2
....................................................–1V to 20V
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 10V
TOP VIEW
TEMP
M
L
K
J
EXTV
CC
EXTV
CC
V
IN
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
10
11
12
LGA PACKAGE
144-LEAD (16mm
×
16mm
×
4.41mm)
BGA PACKAGE
144-LEAD (16mm
×
16mm
×
5.01mm)
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 JESD51-12
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 JESD51-12
WEIGHT = 3.39g
ORDER INFORMATION
PART NUMBER
LTM4630AEV#PBF
LTM4630AIV#PBF
LTM4630AEY#PBF
LTM4630AIY#PBF
PAD OR BALL FINISH
Au (RoHS)
SAC305 (RoHS)
http://www.linear.com/product/LTC4630A#orderinfo
PART MARKING*
DEVICE
LTM4630AV
LTM4630AY
FINISH CODE
e4
e1
PACKAGE
TYPE
LGA
BGA
MSL
RATING
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
• Device temperature grade is indicated by a label on the shipping container. • Recommended BGA PCB Assembly and Manufacturing Procedures:
www.linear.com/BGA-assy
• Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal Finish Part Marking:
www.linear.com/leadfree
• This product is not recommended for second side reflow. For more
information, go to
www.linear.com/BGA-assy
• BGA Package and Tray Drawings:
www.linear.com/packaging
• This product is moisture sensitive. For more information, go to:
www.linear.com/BGA-assy
2
4630afb
For more information
www.linear.com/LTM4630A
LTM4630A
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 18V
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 34.
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
(Note 8)
CONDITIONS
l
l
l
MIN
4.5
0.6
1.477
TYP
MAX
18
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
35
6.5
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
Feedback Overvoltage Lockout
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
0.600
–5
0.66
0.606
–20
0.68
V
nA
V
l
4630afb
For more information
www.linear.com/LTM4630A
3
LTM4630A
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 34.
SYMBOL
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
< 18V
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
< 18V
90
3
I
DIFFOUT
= 300µA
I = 100µA
l
ELECTRICAL CHARACTERISTICS
PARAMETER
Track Pin Soft-Start Pull-Up Current
Undervoltage Lockout (Falling)
CONDITIONS
TRACK1 (I),TRACK2 (I) Start at 0V
MIN
1
TYP
1.25
3.3
0.6
MAX
1.5
UNITS
µA
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
4
4630afb
For more information
www.linear.com/LTM4630A
LTM4630A
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 LTM4630A is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4630AE 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
LTM4630AI 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 300kHz to 750kHz.
Note 5:
LTM4630A device is designed to operate from 300kHz to 750kHz
Note 6:
These parameters are tested at wafer sort.
Note 7:
See Table 1 for Peak Current and Thermal Design Power (TDP)
current for different V
IN
and V
OUT
. See output current derating curve for
different ambient temperature.
Note 8:
Total DC output voltage error includes all errors over temperature:
Line and load regulation as well as the tolerance of the integrated top
feedback resistor.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current,
V
IN
= 5V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
Efficiency vs Output Current,
V
IN
= 12V
0.9V
OUT
, 300kHz
1.0V
OUT
, 300kHz
1.2V
OUT
, 300kHz
1.5V
OUT
, 300kHz
1.8V
OUT
, 300kHz
2.5V
OUT
, 400kHz
3.3V
OUT
, 500kHz
0
2
4
6
8 10 12 14
LOAD CURRENT (A)
16
18
0.9V
OUT
, 300kHz
1.0V
OUT
, 300kHz
1.2V
OUT
, 300kHz
1.5V
OUT
, 400kHz
1.8V
OUT
, 400kHz
2.5V
OUT
, 500kHz
3.3V
OUT
, 600kHz
5.0V
OUT
, 700kHz
8.0V
OUT
, 770kHz
0
2
4
6
8 10 12 14
LOAD CURRENT (A)
16
18
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0.01
Burst Mode and Pulse-Skip Mode
Efficiency V
IN
=12V, V
OUT
= 1.2V,
f
S
= 300kHz
Burst Mode OPERATION
PULSE-SKIP MODE
CCM
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
0.1
1
LOAD CURRENT (A)
10
4630A G04
4630A G01
4630A G02
1V Dual Phase Single Output
Load Transient Response
1.2V Dual Phase Single Output
Load Transient Response
V
OUT(AC)
20mV/DIV
V
OUT(AC)
20mV/DIV
LOAD STEP
10A/DIV
50µs/DIV
12V
IN
, 1V
OUT
, 300kHz, DUAL PHASE SINGLE
OUTPUT SETUP 9A LOAD STEP UP AND STEP
DOWN, 9A/µs SLEW RATE C
OUT
= 2 • 220µF
POSCAP + 4 • 100µF CERAMIC CAPS
4630A G05
LOAD STEP
10A/DIV
50µs/DIV
12V
IN
, 1.2V
OUT
, 300kHz, DUAL PHASE SINGLE
OUTPUT SETUP 9A LOAD STEP UP AND STEP
DOWN, 9A/µs SLEW RATE C
OUT
= 2 • 220µF
POSCAP + 4 • 100µF CERAMIC CAPS
4630A G06
4630afb
For more information
www.linear.com/LTM4630A
5
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