LTM4649
10A Step-Down DC/DC
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
4649
is a complete 10A high efficiency switching
mode step-down DC/DC µModule
®
regulator in a 9mm ×
15mm × 4.92 BGA package. Included in the package are the
switching controller, power FETs, inductor, and all support
components. Operating over an input voltage range of 4.5V
to 16V, the LTM4649 supports an output voltage range of
0.6V to 3.3V, set by a single external resistor. This high
efficiency design delivers 10A continuous current. Only
bulk input and output capacitors are needed.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The device supports
frequency synchronization, programmable multiphase
operation, and output voltage tracking for supply rail
sequencing.
Fault protection features include output overvoltage and
overcurrent protection. The LTM4649 is offered in a small
9mm × 15mm × 4.92mm BGA package available with SnPb
or RoHS compliant terminal finish.
L,
LT, LTC, LTM, Burst Mode, µModule, PolyPhase, Linear Technology and the Linear logo
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, 6580258 and 8163643. Other patents pending.
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10A DC Output Current
Input Voltage Range: 4.5V to 16V
Output Voltage Range: 0.6V Up to 3.3V
No Heat Sink or Current Derating Up to 85°C Ambi-
ent Temperature
±1.5% Total DC Voltage Output Error
Multiphase Operation with Current Sharing
Remote Sense Amplifier
Built-In General Purpose Temperature Monitor
Selectable Pulse-Skipping Mode/Burst Mode
®
Opera-
tion for High Efficiency at Light Load
Soft-Start/Voltage Tracking
Protection: Output Overvoltage and Overcurrent
Foldback
9mm × 15mm × 4.92mm BGA Package
APPLICATIONS
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Telecom, Networking and Industrial Equipment
Point of Load Regulation
TYPICAL APPLICATION
4.5V to 16V Input, 1.5V Output DC/DC
µModule Regulator
95
V
IN
4.5V TO 16V
CLKIN
V
IN
INTV
CC
SW
RUN
MODE
FREQ
V
OUT
V
OUT_LCL
DIFFOUT
LTM4649
DIFFP
DIFFN
V
FB
COMP
PGOOD
CLKOUT
4649 TA01a
Efficiency and Power Loss
at 12V and 5V Input
3.0
2.5
LOAD CURRENT (A)
POWER LOSS (W)
2.0
1.5
1.0
0.5
0
12
10
8
6
4
2
0
V
OUT
1.5V
10A
EFFICIENCY (%)
90
85
80
75
70
65
Current Derating: 12V Input,
1.5V
OUT
, No Heat Sink
22µF
16V
×2
100µF
6.3V
×2
PHMODE
TRACK/SS
TEMP
GND
0.1µF
6.65k
V
IN
= 12V
V
IN
= 5V
0
2
4
6
LOAD CURRENT (A)
8
10
4649 TA01b
400LFM
200LFM
0LFM
0
40
60
80
100
20
AMBIENT TEMPERATURE (°C)
120
4649 TA01c
4649fc
For more information
www.linear.com/LTM4649
1
LTM4649
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
A
1
CLKIN
PHMODE
MODE
2
3
4
5
NC
SW
V
FB
B
TOP VIEW
C D
E
V
IN
NC
GND
F
G
RUN
CLKOUT
FREQ
INTV
CC
TRACK/SS
COMP
DIFFN
DIFFP
DIFFOUT
V
OUT_LCL
GND
V
IN
............................................................. –0.3V to 18V
V
OUT
.......................................................... –0.3V to 3.6V
INTV
CC
, PGOOD, RUN .................................. –0.3V to 6V
MODE, CLKIN, TRACK/SS, DIFFP, DIFFN,
DIFFOUT, PHMODE ............................... –0.3V to INTV
CC
V
FB
............................................................ –0.3V to 2.7V
COMP (Note 3) .......................................... –0.3V to 2.7V
INTV
CC
Peak Output Current ................................100mA
Internal Operating Temperature Range
(Note 2).................................................. –55°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Peak Solder Reflow Package Body Temperature ... 245°C
TEMP 6
PGOOD
7
8
9
10
11
GND
V
OUT
BGA PACKAGE
68-LEAD (9mm
×
15mm
×
4.92mm)
T
JMAX
= 125°C,
θ
JA
= 14°C/W,
θ
JCbottom
= 5°C/W,
θ
JCtop
= 20°C/W
θ
JB
+
θ
BA
= 14°C/W, WEIGHT = 1.7g
ORDER INFORMATION
PART NUMBER
LTM4649EY#PBF
LTM4649IY#PBF
LTM4649IY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM4649#orderinfo
PART MARKING*
DEVICE
LTM4649Y
LTM4649Y
LTM4649Y
FINISH CODE
e1
e1
e0
PACKAGE
TYPE
BGA
BGA
BGA
MSL
RATING
3
3
3
TEMPERATURE RANGE
(Note 2)
–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.
• Pb-free and Non-Pb-free Part Markings:
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
4649fc
2
For more information
www.linear.com/LTM4649
LTM4649
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT(RANGE)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage Range
Output Voltage, Total Variation with
Line and Load
C
IN
= 10µF × 1,C
OUT
= 100µF Ceramic,
100µF POSCAP R
FB
= 6.65k, MODE = GND,
,
V
IN
= 4.5V to 16V, I
OUT
= 0A to 10A
V
RUN
Rising
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
= 12V, V
OUT
= 1.5V, I
OUT
= 10A
V
IN
= 12V, V
OUT
= 1.5V (Note 4)
V
OUT
= 1.5V, V
IN
from 4.5V to 16V I
OUT
= 0A
V
OUT
= 1.5V, I
OUT
= 0A to 10A, V
IN
= 12V
(Note 4)
I
OUT
= 0A, C
OUT
= 100µF Ceramic, 100µF
POSCAP V
IN
= 12V, V
OUT
= 1.5V
,
C
OUT
= 100µF Ceramic, 100µF POSCAP
,
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
= 12V
C
OUT
= 100µF Ceramic, 100µF POSCAP
,
No Load, TRACK/SS = 0.01µF V
IN
= 12V
,
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100µF Ceramic, 100µF POSCAP
,
V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100µF Ceramic, 100µF POSCAP
,
V
IN
= 12V, V
OUT
=1.5V
V
IN
= 12V, V
OUT
= 1.5V (Note 4)
I
OUT
= 0A, V
OUT
= 1.5V
(Note 3)
l
l
l
The
l
denotes the specifications which apply over the specified internal
operating temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V per typical application.
CONDITIONS
l
l
l
MIN
4.5
0.6
1.477
TYP
MAX
16
3.3
UNITS
V
V
V
1.50
1.523
Input Specifications
V
RUN
V
RUN(HYS)
I
Q(VIN)
RUN Pin On Threshold
RUN Pin On Hysteresis
Input Supply Bias Current
1.1
1.25
150
5
15
75
70
1.5
0
0.010
0.15
15
20
5
60
10
0.04
0.5
1.4
V
mV
mA
mA
mA
µA
A
A
%/V
%
mV
mV
ms
mV
I
S(VIN)
I
OUT(DC)
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
OUT(AC)
ΔV
OUT(START)
t
START
ΔV
OUTLS
Input Supply Current
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
Output Ripple Voltage
Turn-On Overshoot
Turn-On Time
Peak Deviation for Dynamic Load
Output Specifications
l
t
SETTLE
Settling Time for Dynamic Load Step
20
µs
I
OUTPK
V
FB
I
FB
V
OVL
I
TRACK/SS
t
ON(MIN)
R
FBHI
DIFFP DIFFN CM
,
RANGE
V
DIFFOUT(MAX)
V
OS
A
V
Output Current Limit
Voltage at V
FB
Pin
Current at V
FB
Pin
Feedback Overvoltage Lockout
Track Pin Soft-Start Pull-Up Current
Minimum On-Time
Resistor Between V
OUT_LCL
and V
FB
Pins
Common Mode Input Range
Maximum DIFFOUT Voltage
Input Offset Voltage
Differential Gain
12
0.593
0.64
1.0
9.90
0.60
–12
0.66
1.2
90
10
10.10
3.6
0.607
–25
0.68
1.4
A
V
nA
V
µA
ns
kΩ
V
V
4
1
mV
V/V
4649fc
Control Specifications
TRACK/SS = 0V
(Note 3)
V
IN
= 12V, Run > 1.4V
I
DIFFOUT
= 300µA
V
DIFFP
= V
DIFFOUT
= 1.5V, I
DIFFOUT
= 100µA
(Note 3)
0
INTV
CC
-1.4
For more information
www.linear.com/LTM4649
3
LTM4649
ELECTRICAL CHARACTERISTICS
SYMBOL
SR
GBP
CMRR
I
DIFFOUT
R
IN
V
PGOOD
PARAMETER
Slew Rate
Gain Bandwidth Product
Common Mode Rejection
DIFFOUT Current
Input Resistance
PGOOD Trip Level
The
l
denotes the specifications which apply over the specified internal
operating temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V per typical application.
CONDITIONS
(Note 5)
(Note 5)
(Note 3)
Sourcing
DIFFP DIFFN to GND
,
V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
I
PGOOD
= 2mA
4.8
I
CC
= 0mA to 50mA
250
400
2.0
0.8
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:
Guaranteed by design.
450
250
2
80
–10
10
0.1
5
0.9
800
500
0.3
5.2
MIN
TYP
2
3
60
MAX
UNITS
V/µs
MHz
dB
mA
kΩ
%
%
V
V
%
kHz
kHz
kΩ
V
V
V
PGL
V
INTVCC
PGOOD Voltage Low
Internal V
CC
Voltage
INTV
CC
Linear Regulator
V
INTVCC
Load Reg INTV
CC
Load Regulation
Oscillator and Phase-Locked Loop
f
SYNC
f
S
R
MODE
V
IH_CLKIN
V
IL_CLKIN
Frequency Sync Capture Range
Nominal Switching Frequency
MODE Input Resistance
Clock Input Level High
Clock Input Level Low
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. Notes are automatically numbered when you apply
the note style.
Note 2:
The LTM4649 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4649E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4649I is guaranteed to meet specifications over the
–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 resistance and other environmental
factors.
4649fc
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For more information
www.linear.com/LTM4649
LTM4649
TYPICAL PERFORMANCE CHARACTERISTICS
12V
IN
Efficiency
100
95
90
EFFICIENCY (%)
85
80
75
70
65
0
2
4
V
OUT
= 1V, 450kHz
V
OUT
= 1.2V, 450kHz
V
OUT
= 1.5V, 450kHz
V
OUT
= 2.5V, 750kHz
V
OUT
= 3.3V, 750kHz
6
8
10
4649 G01
5V
IN
Efficiency
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
0
2
4
V
OUT
= 1V, 450kHz
V
OUT
= 1.2V, 450kHz
V
OUT
= 1.5V, 450kHz
V
OUT
= 2.5V, 450kHz
V
OUT
= 3.3V, 450kHz
6
8
10
4649 G02
CCM, Burst Mode and Pulse-
Skipping Mode Efficiency
100
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
LOAD CURRENT (A)
CCM
PULSE-
SKIPPPING
Burst Mode
OPERATION
10
4649 G03
V
IN
= 12V
V
OUT
= 1.5V
LOAD CURRENT (A)
LOAD CURRENT (A)
5V
IN
, 1V
OUT
Load Transient
I
OUT
5A/DIV
AC
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
V
OUT
100mV/DIV
AC
12V
IN
, 1V
OUT
Load Transient
I
OUT
5A/DIV
AC
V
OUT
100mV/DIV
AC
5V
IN
, 1.5V
OUT
Load Transient
4649 G04
50µs/DIV
5V
IN
, 1V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G05
50µs/DIV
12V
IN
, 1V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G06
50µs/DIV
5V
IN
, 1.5V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
12V
IN
, 1.5V
OUT
Load Transient
I
OUT
5A/DIV
AC
V
OUT
100mV/DIV
AC
I
OUT
5A/DIV
AC
V
OUT
100mV/DIV
AC
5V
IN
, 2.5V
OUT
Load Transient
I
OUT
5A/DIV
AC
V
OUT
100mV/DIV
AC
12V
IN
, 2.5V
OUT
Load Transient
4649 G07
50µs/DIV
12V
IN
, 1.5V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G08
50µs/DIV
5V
IN
, 2.5V
OUT
, 5A TO 10A LOAD STEP
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649 G09
50µs/DIV
,
12V
IN
, 2.5V
OUT
, 5A TO 10A LOAD STEP 750kHz
C
OUT
= 2 • 220µF 4V CERAMIC CAPACITOR
NO C
FF
CAPACITOR
4649fc
For more information
www.linear.com/LTM4649
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