FEATURES
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LTM4650A
Dual 25A or Single 50A
DC/DC µModule Regulator
with 1% DC Accuracy
DESCRIPTION
The
LTM
®
4650A
is a dual 25A or single 50A output switching
mode step-down DC/DC µModule
®
(micromodule) regula-
tor with ±1% total DC output error. Included in the package
are the switching controllers, power FETs, inductors and
all supporting components. Operating from an input volt-
age range of 4.5V to 16V, the LTM4650A supports two
outputs with an output voltage range of 0.6V to 5.5V, each
set by a single external resistor. Its high efficiency design
delivers up to 25A continuous current for each output.
Fast internal control loop compensation allows for fast
transient response to minimize output capacitance when
powering FPGAs, ASICs, and processors.
Fault protection features include overvoltage and over-
current protection. The LTM4650A is offered in 16mm
× 16mm × 4.41mm LGA and16mm × 16mm × 5.01mm
BGA packages.
LTM4650 Product Family Selection Table
V
IN
RANGE
LTM4650
LTM4650-1B
LTM6450-1A
LTM4650A
LTM4650A-1
4.5V to
15V
4.5V to
16V
V
OUT
RANGE
0.6V to
1.8V
0.6V to
5.5V
I
OUT
COMPEN-
DC V
OUT
SATION ACCURACY
Internal
25A × 2
External
Internal
External
1.5%
0.8%
1%
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Dual 25A or Single 50A Output
Input Voltage Range: 4.5V to 16V
Output Voltage Range: 0.6V to 5.5V
±1% Maximum Total DC Output Error Over Line,
Load and Temperature
Higher Light Load Efficiency and Wider V
OUT
Range
Than LTM4650-1
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Multiphase Parallel Current Sharing Up to 300A
Internal Temperature Monitor
Pin Compatible with the LTM4620A (Dual 13A,
Single 26A) and LTM4630A (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
APPLICATIONS
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Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
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.
TYPICAL APPLICATION
50A, 3.3V Output DC/DC µModule Regulator
INTV
CC
V
IN
4.5V TO 16V
10k
4.7µF
V
IN
120k
TEMP
TRACK1
TRACK2
f
SET
COMP1
COMP2
PINS NOT USED IN
THIS CIRCUIT:
CLKOUT
EXTV
CC
SW1
SW2
V
OUTS2
RUN1
RUN2
PHASMD
SGND
GND
V
OUT2
DIFFP
DIFFN
MODE_PLLIN
4650A TA01a
3.3V
OUT
Efficiency vs I
OUT
100
95
PGOOD
PGOOD2
V
OUT1
V
OUTS1
DIFFOUT
V
FB1
100µF
6.3V
V
OUT
3.3V/50A
INTV
CC
PGOOD1
EFFICIENCY (%)
22µF
25V
×4
+
470µF
6.3V
90
85
80
75
0.1µF
INTV
CC
LTM4650A
V
FB2
13.3k
100µF
6.3V
+
70
470µF
6.3V
65
0
10
12V
IN
, 3.3V
OUT
, 600kHz
5V
IN
, 3.3V
OUT
, 600kHz
20
30
LOAD CURRENT (A)
40
50
4650A TA01b
4650afb
For more information
www.linear.com/LTM4650A
1
LTM4650A
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 ..................................50mA
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 18V
V
SW1
, V
SW2
....................................................–1V to 18V
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
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 = 3.6g
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 = 3.8g
ORDER INFORMATION
PART NUMBER
LTM4650AEV#PBF
LTM4650AIV#PBF
LTM4650AEY#PBF
LTM4650AIY#PBF
LTM4650AIY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM4650A#orderinfo
PART MARKING*
DEVICE
LTM4650AV
LTM4650AV
LTM4650AY
LTM4650AY
LTM4650AY
FINISH CODE
e4
e4
e1
e1
e0
PACKAGE
TYPE
LGA
LGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
TOTAL DC
ACCURACY
±1%
±1%
±1%
±1%
±1%
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 ADI 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
4650afb
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For more information
www.linear.com/LTM4650A
LTM4650A
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
= 1.2V, V
OUT2
= 1.2V,
V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.2V, Burst Mode Operation
V
IN
= 12V, V
OUT
= 1.2V, Pulse-Skipping Mode
V
IN
= 12V, V
OUT
= 1.2V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 5V, V
OUT
= 1.2V, I
OUT
= 25A
V
IN
= 12V, V
OUT
= 1.2V, I
OUT
= 25A
V
IN
= 12V, V
OUT
= 1.2V (Note 7)
For Each Output, V
OUT
= 1.2V, I
OUT
= 0A,
V
IN
from 4.5V to 16V
For Each Output, V
IN
= 12V, V
OUT
= 1.2V,
I
OUT
from 0A to 25A (Note 7)
For Each Output, V
IN
= 12V, V
OUT
= 1.2V,
Frequency = 450kHz, I
OUT
= 0A, C
OUT
=
100µF ×3 Ceramic, 470µF POSCAP
V
IN
= 12V, V
OUT
= 1.2V, f
SET
= 1.25V (Note 4)
250
,
C
OUT
= 100µF ×3 Ceramic, 470µF POSCAP
V
IN
= 12V , V
OUT
= 1.2V, I
OUT
= 0A
,
C
OUT
= 100µF ×3 Ceramic, 470µF POSCAP
V
IN
= 12V, No Load, TRACK/SS with 0.01µF
to GND
Load: 0% to 50% to 0% of Full Load
C
OUT
= 100µF ×3 Ceramic, 470µF POSCAP
,
V
IN
= 12V, V
OUT
= 1.2V
Load: 0% to 50% to 0% of Full Load,
V
IN
= 12V, C
OUT
= 100µF ×3 Ceramic,
470µF POSCAP
V
IN
= 12V, V
OUT
= 1.2V
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 DC Variation
with Line and Load (Note 8)
C
IN
= 22µF × 3, C
OUT
= 100µF × 1 Ceramic,
470µF POSCAP
V
IN
= 4.5V to 16V,
V
OUT
= 1.2V, I
OUT
= 0A to 25A
CONDITIONS
l
l
l
MIN
4.5
0.6
1.188
TYP
MAX
16
5.5
UNITS
V
V
V
1.2
1.212
1.1
1.25
150
1
1.40
V
mV
A
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis
Input Supply Bias Current
(Both Channels On)
4.5
19
115
35
8.2
3.1
0
0.02
0.1
15
25
0.1
0.4
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
µs
30
A
I
OUT
= 0A, V
OUT
= 1.2V
(Note 6)
l
0.595
0.64
0.600
–5
0.66
0.605
–20
0.68
V
nA
V
4650afb
l
For more information
www.linear.com/LTM4650A
3
LTM4650A
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.
SYMBOL
I
TRACK1
,
I
TRACK2
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
< 16V
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
= 1.2V, I
DIFFOUT
= 100µA
4.5V < V
IN
< 16V
90
3
I
DIFFOUT
= 300µA
I = 100µA
l
ELECTRICAL CHARACTERISTICS
PARAMETER
Track Pin Soft-Start Pull-Up Current
Undervoltage Lockout (Falling)
CONDITIONS
TRACK1,TRACK2 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
4650afb
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
For more information
www.linear.com/LTM4650A
LTM4650A
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 LTM4650A is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4650AE 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
LTM4650AI 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 250kHz to 780kHz.
Note 5:
LTM4650A device is designed to operate from 250kHz to 780kHz
Note 6:
These parameters are tested at wafer sort.
Note 7:
See output current derating curve for different ambient
temperature.
Note 8:
Total DC output voltage error includes all errors over
temperature – reference, line and load regulation as well as the tolerance
of the integrated top feedback resistor.
4650afb
For more information
www.linear.com/LTM4650A
5
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