LTM4628
Dual 8A or Single 16A
DC/DC µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
4628
is a complete dual 8A output switching
mode DC/DC power supply and can be easily configured
to provide a single 2-phase 16A output. Included in the
package are the switching controller, power FETs, inductor,
and all supporting components. Operating from an input
voltage range of 4.5V to 26.5V, the LTM4628 supports
two outputs each with an output voltage range of 0.6V to
5.5V, set by a single external resistor. Its high efficiency
design delivers 8A 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. It 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 over-
current protection. The power module is offered in space
saving and thermally enhanced 15mm × 15mm × 4.32mm
LGA and 15mm × 15mm × 4.92mm BGA packages. The
LTM4628 is available with SnPb (BGA) or RoHS compli-
ant terminal finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase
are registered and LTpowerCAD is a trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Complete Standalone Dual Power Supply
Single 16A or Dual 8A Output
Wide Input Voltage Range: 4.5V to 26.5V
Output Voltage Range: 0.6V to 5.5V
±1.5% Total DC Output Error
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Adjustable Switching Frequency
Overcurrent Foldback Protection
Multiphase Parallel Current Sharing with
Multiple LTM4628s
Frequency Synchronization
Internal Temperature Sensing Diode Output
Selectable Burst Mode
®
Operation
Soft-Start/Voltage Tracking
Output Overvoltage Protection
Small Surface Mount Footprint, Low Profile
15mm × 15mm × 4.32mm LGA and
15mm × 15mm × 4.92mm BGA Packages
APPLICATIONS
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Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
TYPICAL APPLICATION
Dual 8A, 1.5V and 1.2V Output DC/DC µModule
®
Regulator
4.7µF
MODE_PLLIN CLKOUT INTV
CC
*
10µF
35V
×4
V
IN
120k
TEMP
RUN1
RUN2
*
TRACK1
5.1V ZENER
0.1µF
TRACK2
f
SET
PHASMD
100k
LTM4628
EXTV
CC
PGOOD1
V
OUT1
V
OUTS1
DIFFOUT
SW1
V
FB1
V
FB2
COMP1
COMP2
V
OUTS2
V
OUT2
SW2
PGOOD2
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL.
SGND
GND
DIFFP
DIFFN
4628 TA01a
Efficiency and Power Loss
at 12V Input
100µF
6.3V
V
OUT1
1.5V AT 8A
470µF
6.3V
EFFICIENCY (%)
95
90
85
80
75
70
65
60
55
50
0
1
2
3
5
6
4
LOAD CURRENT (A)
7
8
POWER LOSS
1.2V
1.5V
2.0
EFFICIENCY
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
POWER LOSS (W)
V
IN
4.5V TO
26.5V
10k
40.2k
60.4k
100µF
6.3V
V
OUT2
1.2V AT 8A
470µF
6.3V
4628 TA01b
4628fe
For more information
www.linear.com/LTM4628
1
LTM4628
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
............................................................. –0.3V to 28V
V
SW1
, V
SW2
....................................................–1V to 28V
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
..................... –0.3V to 6V
DIFFP, DIFFN ......................................... –0.3V to INTV
CC
V
FB1
, V
FB2
, COMP1, COMP2 (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
M
L
K
TEMP
EXTV
CC
V
IN
TOP VIEW
M
V
IN
L
K
TEMP
EXTV
CC
INTV
CC
SW1
PHASMD CLKOUT
MODE_PLLIN RUN1
GND
SGND
PGOOD2 PGOOD1
DIFFOUT RUN2
DIFFP
TRACK2
DIFFN
GND
SW2
J
H
SW1
INTV
CC
PHASMD CLKOUT
MODE_PLLIN RUN1
GND
SGND
PGOOD2 PGOOD1
DIFFOUT RUN2
DIFFP
TRACK2
DIFFN
GND
SW2
J
H
G
F
E
D
C
B
V
OUT1
GND
V
OUT2
V
OUT1
GND
V
OUT2
TRACK1 COMP1 COMP2
V
FB1
V
OUTS1
SGND
f
SET
V
FB2
G
F
E
D
C
B
A
1
2
TRACK1 COMP1 COMP2
V
FB1
V
OUTS1
SGND
f
SET
V
FB2
SGND V
OUTS2
SGND V
OUTS2
A
12
1
2
3
4
5
6
7
8
9
10
11
12
3
4
5
6
7
8
9
10
11
LGA PACKAGE
144-LEAD (15mm
×
15mm
×
4.32mm)
T
JMAX
= 125°C,
θ
JCtop
= 17°C/W,θ
JCbottom
= 2.75°C/W,
θ
JB
+
θ
BA
= 11°C/W,
θ
JA
= 9.5°C/W–11°C/W,
θ
BA
= BOARD TO AMBIENT RESISTANCE,
θ
VALUES DEFINED PER JESD 51-12
WEIGHT = 2.7g
BGA PACKAGE
144-LEAD (15mm
×
15mm
×
4.92mm)
T
JMAX
= 125°C,
θ
JCtop
= 17°C/W,θ
JCbottom
= 2.75°C/W,
θ
JB
+
θ
BA
= 11°C/W,
θ
JA
= 9.5°C/W–11°C/W,
θ
BA
= BOARD TO AMBIENT RESISTANCE,
θ
VALUES DEFINED PER JESD 51-12
WEIGHT = 2.9g
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM4628EV#PBF
LTM4628IV#PBF
LTM4628EY#PBF
LTM4628IY#PBF
LTM4628IY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM4628V
LTM4628V
LTM4628Y
LTM4628Y
LTM4628Y
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
4628fe
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For more information
www.linear.com/LTM4628
LTM4628
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
OUT
= 100µF , 470µF POSCAP V
OUT1
= 1.5V,
V
OUT2
= 1.5V, V
IN
= 12V, TRACK = 0.01µF
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
= 4.75V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 26.5V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 12V, V
OUT
= 1.5V (Note 7)
V
OUT
= 1.5V, V
IN
from 4.5V to 26.5V
I
OUT
= 0A for Each Output,
For Each Output, V
OUT
= 1.5V, 0A to 8A
V
IN
= 12V (Note 7)
I
OUT
= 0A, C
OUT
= 100µF X5R Ceramic,
470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 12V, V
OUT
= 1.5V, f
SET
= 2.5V (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
10
5
l
l
The
l
denotes the specifications which apply over the full internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted, per the typical application in Figure 28.
PARAMETER
Input DC Voltage
Output Voltage
Output Voltage, Total Variation with
Line and Load
CONDITIONS
l
l
MIN
4.5
0.6
TYP
MAX
26.5
5.5
UNITS
V
V
C
IN
= 22µF × 3, C
OUT
= 100µF × 1
Ceramic, 470µF POSCAP, MODE_PLLIN =
GND, RFB1, RFB2 = 40.2k, V
IN
= 4.5V to 26.5V,
l
I
OUT
= 0A to 8A
1.477
1.5
1.523
V
1.1
1.25
150
1
1.40
V
mV
A
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis
Input Supply Bias Current
5
15
65
60
2.9
1.18
0.575
0
0.010
0.15
15
8
0.04
0.3
mA
mA
mA
µA
A
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
Input Supply Current
Output Continuous
Current Range
Line Regulation Accuracy
ΔV
OUT1(LOAD)
/V
OUT1
Load Regulation Accuracy
ΔV
OUT2(LOAD)
/V
OUT2
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
FB1
, I
FB2
V
OVL
Voltage at V
FB
Pins
Leakage Current of V
FB1
, V
FB2
Feedback Overvoltage Lockout
Output Ripple Voltage Frequency
SYNC Capture Range
Turn-On Overshoot
Turn-On Time
780
Peak Deviation for Dynamic Load
30
mV
Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load,
V
IN
= 12V, C
OUT
= 100µF, C
OUT
= 470µF
Output Current Limit
V
IN
= 12V, V
OUT
= 1.5V
20
15
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
4628fe
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For more information
www.linear.com/LTM4628
3
LTM4628
The
l
denotes the specifications which apply over the full internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted, per the typical application in Figure 28.
SYMBOL
I
TRACK1
, I
TRACK2
UVLO
UVLO Hysteresis
t
ON(MIN)
R
FBHI1
, R
FBHI2
V
OL_PGOOD
(Each Channel)
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
< 26.5V
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
200
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
< 20V
I
DIFFOUT
= 300µA
INTV
CC
– 1.4V
3
90
3
80
3
550
290
860
11
100
5.2
2
(Note 6)
60.05
PARAMETER
Track Pin Soft-Start Pull-Up Current
Undervoltage Lockout Threshold
CONDITIONS
TRACK1, TRACK2 = 0V
V
IN
Falling
V
IN
Rising
MIN
1
TYP
1.25
3.3
3.9
0.6
90
60.4
0.1
60.75
0.3
±5
MAX
1.5
UNITS
µA
V
V
V
ns
kΩ
V
µA
%
%
V
%
V
mV
mV
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
V/V
kΩ
mV
dB
mA
V
MHz
ELECTRICAL CHARACTERISTICS
INTV
CC
Linear Regulator
V
INTVCC
V
INTVCC
Load Regulation
V
EXTVCC
V
EXTVCC(DROP)
V
EXTVCC(HYST)
f
NOM
f
LOW
f
HIGH
I
fSET
R
MODE_PLLIN
Ph
CLKOUT
V
OH_CLKOUT
V
OL_CLKOUT
Differential Amplifier
A
V
R
IN
V
OS
PSRR
I
CL
DIFFOUT (MAX)
GBW
Voltage Gain
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain Bandwidth Product
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
Oscillator and Phase-Locked Loop
4628fe
4
For more information
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LTM4628
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 LTM4628 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4628E 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
LTM4628I 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 for 400kHz to 750kHz.
Note 5:
LTM4628 device is designed to operate from 400kHz to 750kHz
Note 6:
100% tested at wafer level.
Note 7:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
TYPICAL PERFORMANCE CHARACTERISTICS
5V
IN
Efficiency
100
95
90
85
80
75
70
65
0
1
4
5
2
3
6
OUTPUT CURRENT (A)
3.3V
OUT
2.5V
OUT
1.5V
OUT
1.2V
OUT
0.8V
OUT
7
8
FREQ = 500kHz
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
55
0
1
4
5
2
3
6
OUTPUT CURRENT (A)
5V
OUT
3.3V
OUT
2.5V
OUT
1.5V
OUT
1.2V
OUT
0.8V
OUT
7
8
12V
IN
Efficiency
FREQ = 500kHz, 700kHz for 3.3V AND 5V
95
90
85
80
75
70
65
60
55
50
24V
IN
Efficiency
FREQ = 500kHz, 700kHz for 3.3V AND 5V
5V
OUT
3.3V
OUT
2.5V
OUT
1.5V
OUT
0
1
4
5
2
3
6
OUTPUT CURRENT (A)
7
8
4628 G01
4628 G02
4628 G03
Burst Mode Pulse-Skipping
Efficiency
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.001
0.01
PULSE-SKIPPING MODE
I
OUT
2A/DIV
Burst Mode OPERATION
V
OUT
50mV/DIV
0.8V Load Transient
1.2V Load Transient
V
OUT
50mV/DIV
I
OUT
2A/DIV
4628 G05
100µs/DIV
12V
IN
, 0.8V
OUT
, 0A TO 4A LOAD STEP AT 4A/µs
C
OUT1
4× 100µF 6.3V X5R CERAMIC 1210 CASE SIZE
SWITCHING FREQUENCY 400kHz
C
FF
CAPACITOR = 47pF
100µs/DIV
4628 G06
1
0.1
OUTPUT CURRENT (A)
10
4628 G04
12V
IN
, 1.2V
OUT
, 0A TO 4A LOAD STEP AT 4A/µs
C
OUT1
, 4× 100µF 6.3V X5R CERAMIC 1210 CASE SIZE
SWITCHING FREQUENCY 500kHz
C
FF
CAPACITOR = 47pF
4628fe
For more information
www.linear.com/LTM4628
5
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