LTM4647
30A DC/DC Step-Down
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
4647
is a complete 30A output switching mode
step-down DC/DC µModule
®
(power module) regulator.
Included in the package are the switching controller, power
FETs, inductor and all supporting components. Operating
over an input voltage range of 4.7V to 15V, the LTM4647
supports an output voltage range of 0.6V to 1.8V, set by
a single external resistor. Only a few input and output
capacitors are needed.
Its high efficiency design delivers 87% efficiency from 12V
input to 1.0V output with 30A continuous load current.
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, N+1 phase redundancy, and output voltage
tracking for supply rail sequencing.
Fault protection features include overvoltage and overcur-
rent protection. The power module is offered in a space
saving 9mm
×
15mm
×
5.01mm BGA package. The
LTM4647 is available with SnPb (BGA) or RoHS compli-
ant terminal finish.
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4.7V to 15V Input Voltage Range
0.6V to 1.8V Output Voltage Range
30A DC Output Current
±1.2% Total DC Output Voltage Error (–40°C to 125°C)
High Reliability N + 1 Phase Redundancy Supported
Internal or External Control Loop Compensation
Differential Remote Sense Amplifier for Precision
Regulation
Current Mode Control/Fast Transient Response
Multiphase Current Sharing Up to 180A
Built-In Temperature Monitoring
Selectable Pulse-Skipping, Burst Mode
®
Operation
Soft-Start/Voltage Tracking
Frequency Synchronization
Output Overvoltage Protection
Output Overcurrent Foldback Protection
9mm
×
15mm
×
5.01mm BGA Package
APPLICATIONS
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Telecom, Networking and Industrial Equipment
Point-of-Load Regulation
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule, LTpowerCAD
and PolyPhase are registered trademarks of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
12V
IN
, 1V
OUT
, 30A DC/DC µModule Regulator
1µF
2.2
V
IN
6V TO 15V
V
IN
HIZB
FREQ
COMPa
COMPb
TRACK/SS
0.1µF
LTM4647
V
OUT
V
OSNS+
V
FB
V
OSNS–
SGND GND
4647 TA01a
1V
OUT
Efficiency vs Load Current
100
95
90
EFFICIENCY (%)
85
80
75
70
65
0
5
10
15
20
5V INPUT*
12V INPUT
25
30
LOAD CURRENT (A)
*5V INPUT SEE FIGURE 24
4.7µF
6.3V
DRV
CC
INTV
CC
SV
IN
22µF
25V
×2
43.2k
47pF
90.9k
V
OUT
1V
30A
100µF
6.3V
×6
PINS NOT USED IN THIS CIRCUIT:
CLKOUT, MODE/PLLIN, PGOOD,
PHASMD, PWM, RUN, SW, TEMP
+
, TEMP
–
4647 TA01b
4647fb
For more information
www.linear.com/LTM4647
1
LTM4647
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
1
A
DRV
CC
TEST2
B
C
GND
HIZB
GND
V
IN
2
TOP VIEW
3
4
5
6
7
GND GND RUN GND
PWM
TEST1
MODE/PLLIN
INTV
CC
PHASMD
SV
IN
FREQ
V
FB
SGND
TEST3
V
OSNS+
PGOOD
COMPa
COMPb
CLKOUT
V
IN
, SV
IN
, HIZB .......................................... –0.3V to 16V
V
OUT
, ......................................................... –0.3V to 3.5V
INTV
CC
, DRV
CC
, PGOOD, RUN ..................... –0.3V to 6V
MODE/PLLIN, TRACK/SS, V
OSNS+
, V
OSNS –
,
CLKOUT, COMPa, COMPb, V
FB
, PHASMD,
FREQ .................................................... –0.3V to INTV
CC
Internal Operating Temperature Range (Note 2)....–40 to
125°C
Storage Temperature Range ...................... –55 to 125°C
Peak Solder Reflow Body Temperature ................. 250°C
TEMP
+
, TEMP
–
.......................................... –0.3V to 0.8V
D
TEMP
–
E
TRACK/SS
SW
+
TEMP F
V
OSNS–
G
H
J
K
L
GND
V
OUT
GND
BGA PACKAGE
77-LEAD (9mm
×
15mm
×
5.01mm)
T
J(MAX)
= 125°C,
θ
JA
= 9.5°C/W,
θ
JCbottom
= 4°C/W,
θ
JCtop
= 6.7°C/W,
θ
JB
= 4.5°C/W
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH SIX LAYERS; WEIGHT = 2g
θ
VALUES DETERMINED PER JESD51-12
ORDER INFORMATION
PART NUMBER
LTM4647EY#PBF
LTM4647IY#PBF
LTM4647IY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM4647#orderinfo
PART MARKING*
DEVICE
LTM4647Y
LTM4647Y
LTM4647Y
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.
• 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
2
4647fb
For more information
www.linear.com/LTM4647
LTM4647
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 the typical application.
SYMBOL
V
IN
V
OUT(RANGE)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage Range
Output Voltage, Total Variation
with Line and Load
Input Supply Bias Current
CONDITIONS
V
IN
= 4.7V to 6V per Figure 24 Schematic
V
IN
= 6V to 15V per Figure 23 Schematic
V
IN
= 4.7V to 15V
C
IN
= 22µF
×
4, C
OUT
= 100µF Ceramic, 470µF POSCAP,
R
FB
= 60.4k, MODE = GND,V
IN
= 4.7V to 15V, I
OUT
= 0A to 30A
V
IN
= 12V, V
OUT
= 1.2V, Burst Mode Operation, I
OUT
= 0A
V
IN
= 12V, V
OUT
= 1.2V, Pulse-Skipping Mode, I
OUT
= 0A
V
IN
= 12V, V
OUT
= 1.2V, Switching Continuous, I
OUT
= 0A
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.2V, I
OUT
= 30A
V
IN
= 12V, V
OUT
= 1.2V (Note 4)
V
OUT
= 1.2V, V
IN
from 4.7V to 15V, I
OUT
= 0A
V
OUT
= 1.2V, I
OUT
= 0A to 30A, V
IN
= 12V (Note 4)
C
OUT
= 100µF Ceramic
×
6,
V
IN
= 12V, V
OUT
= 1.2V, I
OUT
= 0A
C
OUT
= 100µF Ceramic
×
6,
V
IN
= 12V, V
OUT
= 1.2V, I
OUT
= 0A
C
OUT
= 100µF Ceramic
×
6
V
IN
= 12V, V
OUT
= 1.2V, No Load, TRACK/SS = 0.01µF
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100µF Ceramic
×
6, V
IN
= 12V, V
OUT
= 1.2V
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100µF Ceramic × 6, V
IN
= 12V, V
OUT
= 1.2V
V
IN
= 12V, V
OUT
= 1.2V
I
OUT
= 0A, V
OUT
= 1.2V
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
4.7
0.6
1.196
1.186
TYP
MAX
15
1.8
UNITS
V
V
V
V
mA
mA
mA
µA
A
1.200
1.200
11
22
130
90
3.6
1.204
1.214
Input Specifications
I
Q(VIN)
I
S(VIN)
I
OUT(DC)
∆V
OUT(LINE)
/V
OUT
V
OUT(AC)
∆V
OUT(START)
t
START
∆V
OUTLS
t
SETTLE
I
OUTPK
V
FB
I
FB
I
TRACK/SS
t
ON(MIN)
R
FBHI
V
RUN
V
RUNHYS
UVLO
UVLO
HYS
V
HIZB
V
HIZBHYS
Input Supply Current
Output Continuous Current
Range
Line Regulation Accuracy
Output Ripple Voltage
Turn-On Overshoot
Turn-On Time
Peak Deviation for Dynamic
Load
Settling Time for Dynamic
Load Step
Output Current Limit
Voltage at V
FB
Pin
Current at V
FB
Pin
Track Pin Soft-Start Pull-Up
Current
Minimum On-Time
Resistor Between V
OUT_LCL
and V
FB
Pins
RUN Pin On Threshold
RUN Pin On Hysteresis
Undervoltage Lockout
UVLO Hysteresis
HIZB Pin On Threshold
HIZB Pin On Hysteresis
Output Specifications
0
0.005
0.1
15
20
5
36
15
34
597.5
595
600
600
–30
1.25
90
60.05
V
RUN
Rising
V
INTVCC
Falling
V
HIZB
Rising
1.2
60.40
1.35
180
4
300
2.3
800
60.75
1.45
602.5
605
–100
30
0.02
0.3
A
%/V
%
mV
mV
ms
mV
µs
A
mV
nA
µA
ns
kΩ
V
mV
V
mV
V
mV
∆V
OUT(LOAD)
/ V
OUT
Load Regulation Accuracy
Control Specifications
(Note 7)
TRACK/SS = 0V
(Notes 3, 7)
4647fb
For more information
www.linear.com/LTM4647
3
LTM4647
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 the typical application.
SYMBOL
PGOOD
R
PGOOD
V
PGOOD
V
PGL
V
INTVCC
V
INTVCC
Load Reg
f
SYNC
f
SW
I
FREQ
R
MODE_PLLIN
V
IH_MODE_PLLIN
V
IL_MODE_PLLIN
θ
CLKOUT
PGOOD Pull-Down Resistance
PGOOD Trip Level
V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
I
PGOOD
= 2mA
V
IN
≥ 12V
I
CC
= 0mA to 10mA
400
R
FREQ
= 47.5kΩ
V
FREQ
= 0.8V
2.0
1.2
V
PHSMD
= 0V
V
PHSMD
= 1/4 INTV
CC
V
PHSMD
= Float
V
PHSMD
= 3/4 INTV
CC
V
PHSMD
= INTV
CC
90
90
120
60
180
540
600
20
250
5.3
90
–7.5
7.5
0.1
5.5
0.5
800
660
0.3
5.7
200
Ω
%
%
V
V
%
kHz
kHz
µA
kΩ
V
V
Deg
Deg
Deg
Deg
Deg
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ELECTRICAL CHARACTERISTICS
PGOOD Voltage Low
Internal V
CC
Voltage
INTV
CC
Load Regulation
SYNC Capture Range
Switching Frequency
FREQ Pin Current
Mode_PLLIN Input Resistance
Clock Input Level High
Clock Input Level Low
CLKOUT to SW Phase Delay
INTV
CC
Linear Regulator
Oscillator and Phase-Locked Loop
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 LTM4647 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4647E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the full –40°C to 125°C internal operating temperature range are
assured by design, characterization and correlation with statistical process
controls. The LTM4647I is guaranteed to meet specifications 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 resistance and other environmental
factors.
Note 3:
The minimum on-time condition is specified for a peak-to-peak
inductor ripple current of ~40% of I
MAX
Load. (See the Applications
Information section)
Note 4:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 5:
Limit current into the RUN pin to less than 2mA.
Note 6:
Guaranteed by design.
Note 7:
100% tested at wafer level.
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4647fb
For more information
www.linear.com/LTM4647
LTM4647
TYPICAL PERFORMANCE CHARACTERISTICS
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
0
5
Efficiency vs Output Current,
V
IN
= 5V
100
95
90
Efficiency vs Output Current,
V
IN
= 12V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
30
4647 G02
CCM, Burst Mode and Pulse-
Skipping Mode Efficiency V
IN
=
12V, V
OUT
= 1.2V, 500kHz
85
80
75
70
0.8V
OUT
, 400kHz
1V
OUT
, 500kHz
1.2V
OUT
, 500kHz
1.5V
OUT
, 600kHz
1.8V
OUT
, 700kHz
10
20
15
LOAD CURRENT (A)
25
30
4647 G01
65
0.8V
OUT
, 400kHz
1V
OUT
, 500kHz
1.2V
OUT
, 500kHz
1.5V
OUT
, 600kHz
1.8V
OUT
, 700kHz
0
5
10
20
15
LOAD CURRENT (A)
25
CCM
Burst Mode OPERATION
PULSE-SKIPPING MODE
10
1
LOAD CURRENT (A)
100
4647 G03
0
0.1
0.8V Output Load Stop Transient
Response
SW
20V/DIV
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
10A/DIV
20µs/DIV
V
IN
= 12V, V
OUT
= 0.8V, F
S
= 400kHz
C
OUT
= 6 × 100µF CERAMIC
0A to 7.5A LOAD STEP 10A/µs
,
4647 G04
1V Output Load Step Transient
Response
SW
20V/DIV
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
10A/DIV
20µs/DIV
V
IN
= 12V, V
OUT
= 1V, F
S
= 500kHz
C
OUT
= 6 × 100µF CERAMIC
0A to 7.5A LOAD STEP 10A/µs
,
4647 G05
1.2V Output Load Step Transient
Response
SW
20V/DIV
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
10A/DIV
20µs/DIV
V
IN
= 12V, V
OUT
= 1.2V, F
S
= 500kHz
C
OUT
= 6 × 100µF CERAMIC
0A to 7.5A LOAD STEP 10A/µs
,
4647 G06
1.5V Output Load Step Transient
Response
SW
20V/DIV
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
10A/DIV
SW
20V/DIV
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
10A/DIV
1.8V Output Load Step Transient
Response
20µs/DIV
V
IN
= 12V, V
OUT
= 1.5V, F
S
= 600kHz
C
OUT
= 6 × 100µF CERAMIC
0A to 7.5A LOAD STEP 10A/µs
,
4647 G07
20µs/DIV
V
IN
= 12V, V
OUT
= 1.8V, F
S
= 700kHz
C
OUT
= 6 × 100µF CERAMIC
0A to 7.5A LOAD STEP 10A/µs
,
4647 G08
4647fb
For more information
www.linear.com/LTM4647
5
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