FEATURES
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LTM4650A-1
Dual 25A or Single 50A
DC/DC µModule Regulator
with 1% DC Accuracy
DESCRIPTION
The
LTM
®
4650A-1
is a dual 25A or single 50A output
switching mode step-down DC/DC µModule
®
(micromod-
ule) regulator 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 voltage range of 4.5V to 16V, the LTM4650A-1
supports two outputs with an output voltage range of 0.6V
to 5.5V, each set by a single external resistor. Its high ef-
ficiency design delivers up to 25A continuous current for
each output. Only a few input and output capacitors are
needed. Adjustable control loop compensation allows for
fast transient response to minimize output capacitance
when powering FPGAs, ASICs, and processors.
Fault protection features include overvoltage and overcur-
rent protection. The LTM4650A-1 is offered in 16mm ×
16mm × 5.01mm BGA package.
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
Adjustable Control Loop Compensation
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Multiphase Parallel Current Sharing Up to 300A
Internal Temperature Monitor
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
×
5.01mm BGA Package
APPLICATIONS
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Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode, PolyPhase and
LTpowerCAD 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 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
PINS UNUSED IN
THIS APPLICATION:
CLKOUT
EXTV
CC
SW1
SW2
V
OUTS2
R
TH
C
TH
COMP2
RUN1
RUN2
PHASMD
SGND
GND
V
OUT2
DIFFP
DIFFN
MODE_PLLIN
4650a1 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
470µF
6.3V
EFFICIENCY (%)
22µF
25V
×4
+
90
85
80
75
0.1µF
INTV
CC
LTM4650A-1
V
FB2
13.3k
100µF
6.3V
+
70
470µF
6.3V
65
12 V
IN
, 3.3V
OUT
, 600kHz
5 V
IN
, 3.3V
OUT
, 600kHz
0
10
20
30
LOAD CURRENT (A)
40
50
4650a1 TA01b
4650a1f
For more information
www.linear.com/LTM4650A-1
1
LTM4650A-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
TEMP
M
L
K
J
V
IN
............................................................. –0.3V to 18V
V
SW1
, V
SW2
....................................................–1V to 18V
PGOOD1, PGOOD2, RUN1, RUN2,
INTV
C
C, 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 5) ........ –0.3V to 6V
DIFFP, DIFFN ......................................... –0.3V to INTV
CC
COMP1, COMP2, V
FB1
, V
FB2
(Note 5) ........ –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
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
V
OUT1
GND
6
7
8
9
V
OUT2
10
11
12
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 JESD 51-12
WEIGHT = 3.8g
ORDER INFORMATION
PART NUMBER
LTM4650AEY-1#PBF
LTM4650AIY-1#PBF
LTM4650AIY-1
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM4650A-1#orderinfo
PART MARKING*
DEVICE
LTM4650AY-1
LTM4650AY-1
LTM4650AY-1
FINISH CODE
e1
e1
e0
PACKAGE
TYPE
BGA
BGA
BGA
MSL
RATING
3
3
3
TOTAL DC
ACCURACY
±1%
±1%
±1%
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
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT
V
OUT1(DC)
,
V
OUT2(DC)
PARAMETER
Input DC Voltage
Output Voltage
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.
CONDITIONS
l
l
l
MIN
4.5
0.6
1.188
TYP
MAX
16
5.5
UNITS
V
V
V
Output Voltage, Total DC Variation C
IN
= 22µF
×
3, C
OUT
= 100µF
×
1 Ceramic,
with Line and Load (Note 7)
470µF POSCAP
V
IN
= 4.5V to 16V,
V
OUT
= 1.2V, I
OUT
= 0A to 25A
1.2
1.212
2
4650a1f
For more information
www.linear.com/LTM4650A-1
LTM4650A-1
ELECTRICAL CHARACTERISTICS
SYMBOL
Input Specifications
V
RUN1
, V
RUN2
V
RUN1HYS
, V
RUN2HYS
I
INRUSH(VIN)
I
Q(VIN)
RUN Pin On/Off Threshold
RUN Pin On Hysteresis
Input Inrush Current at Start-Up
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
0
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
CONDITIONS
RUN Rising
MIN
1.1
TYP
1.25
150
1
MAX
1.40
UNITS
V
mV
A
Input Supply Bias Current
(Both Channels On)
4.5
19
115
35
8.2
3.1
25
0.02
0.1
15
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
V
OUT1(AC)
, V
OUT2(AC)
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)
Input Supply Current
Output Continuous Current Range V
IN
= 12V, V
OUT
= 1.2V (Note 6)
Line Regulation Accuracy
For Each Output, V
OUT
= 1.2V, I
OUT
= 0A,
V
IN
from 4.5V to 16V
Load Regulation Accuracy
Output Ripple Voltage
For Each Output, V
IN
= 12V, V
OUT
= 1.2V,
I
OUT
from 0A to 25A
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)
Output Ripple Voltage Frequency
SYNC Capture Range
Turn-On Overshoot
Turn-On Time
500
250
10
5
,
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
I
OUT
= 0A, V
OUT
= 1.2V
(Note 5)
l
Peak Deviation for Dynamic Load
30
mV
Settling Time for Dynamic Load
Step
20
µs
I
OUT(PK)
(Each Channel) Output Current Limit
Control Section
V
FB1
, V
FB2
I
FB
V
OVL
I
TRACK1
, I
TRACK2
UVLO
UVLO Hysteresis
t
ON(MIN)
R
FBHI1
, R
FBHI2
V
PGOOD1
, V
PGOOD2
Low
Minimum On-Time
Resistor Between V
OUTS1
, V
OUTS2
and V
FB1
, V
FB2
Pins for Each Output
PGOOD Voltage Low
Feedback Overvoltage Lockout
Voltage at V
FB
Pins
30
0.595
0.64
1
0.600
–5
l
A
0.605
–20
0.68
1.5
V
nA
V
µA
V
V
ns
60.75
0.3
kΩ
V
4650a1f
0.66
1.25
3.3
0.6
Track Pin Soft-Start Pull-Up Current TRACK1,TRACK2 Start at 0V
Undervoltage Lockout (Falling)
(Note 5)
90
60.05
60.4
0.1
I
PGOOD
= 2mA
For more information
www.linear.com/LTM4650A-1
3
LTM4650A-1
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
I
PGOOD
V
PGOOD
INTV
CC
Linear Regulator
V
INTVCC
V
EXTVCC
V
EXTVCC(DROP)
V
EXTVCC(HYST)
Frequency Nominal
Frequency Low
Frequency High
f
SET
R
MODE_PLLIN
CLKOUT
Internal V
CC
Voltage
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
I = 100µA
l
ELECTRICAL CHARACTERISTICS
PARAMETER
PGOOD Leakage Current
PGOOD Trip Level
CONDITIONS
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
MIN
TYP
MAX
±5
UNITS
µA
%
%
–10
10
4.8
4.5
5
0.5
4.7
50
220
100
5.2
2
V
%
V
mV
mV
V
INTVCC
Load Regulation INTV
CC
Load Regulation
Oscillator and Phase-Locked Loop
f
SET
= 1.2V
f
SET
= 0V
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
I
DIFFOUT
= 300µA
INTV
CC
– 1.4
3
0.6
–2.2
90
3
80
3
550
290
860
11
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
V/V
kΩ
mV
dB
mA
V
MHz
V
mV/C
CLK High
CLK Low
Differential Amplifier
A
V
Differential Amp
R
IN
V
OS
PSRR Differential Amp
I
CL
V
OUT(MAX)
GBW
V
TEMP
T
C
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-1 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4650AE-1 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-1 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:
These parameters are tested at wafer sort.
Note 6:
See output current derating curve for different ambient
temperature.
Note 7:
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.
4
4650a1f
For more information
www.linear.com/LTM4650A-1
LTM4650A-1
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current,
V
IN
= 5V
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
100
95
90
EFFICIENCY (%)
85
80
75
70
1.0V
OUT
, 300kHz
1.2V
OUT
, 400kHz
1.5V
OUT
, 400kHz
1.8V
OUT
, 500kHz
2.5V
OUT
, 500kHz
3.3V
OUT
, 600kHz
5.0V
OUT
, 750kHz
0
5
10
15
LOAD CURRENT (A)
20
25
4650a1 G02
Efficiency vs Output Current,
V
IN
= 12V
100
90
80
70
60
50
40
30
20
10
Burst Mode and Pulse-Skip Mode
Efficiency V
IN
=12V, V
OUT
= 1.2V,
f
S
= 400kHz
85
80
75
70
65
0
5
1.0V
OUT
, 300kHz
1.2V
OUT
, 400kHz
1.5V
OUT
, 400kHz
1.8V
OUT
, 500kHz
2.5V
OUT
, 500kHz
3.3V
OUT
, 600kHz
10
15
LOAD CURRENT (A)
20
25
4650a1 G01
65
0
0.01
Burst Mode OPERATION
PULSE-SKIP MODE
CCM
0.1
1
LOAD CURRENT (mA)
10
4650a1 G03
1V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
1.2V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
V
OUT
(AC)
50mV/DIV
LOAD STEP
10A/DIV
100µs/DIV
12V
IN
, 1.2V
OUT,
400kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/ s SLEW RATE
C
OUT
= 8× 220 F CERAMIC CAP
R
TH
= 3.32k, C
TH
= 6800pF C
FF
= 68pF
,
4650a1 G05
1.5V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
V
OUT
(AC)
50mV/DIV
LOAD STEP
10A/DIV
100µs/DIV
12V
IN
, 1V
OUT,
300kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/ s SLEW RATE
C
OUT
= 8× 220 F CERAMIC CAP
R
TH
= 3.32k, C
TH
= 6800pF C
FF
= 68pF
,
4650a1 G04
V
OUT
(AC)
50mV/DIV
LOAD STEP
10A/DIV
100µs/DIV
12V
IN
, 1.5V
OUT,
400kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/ s SLEW RATE
C
OUT
= 8× 220 F CERAMIC CAP
R
TH
= 3.32k, C
TH
= 6800pF C
FF
= 68pF
,
4650a1 G06
1.8V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
2.5V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
3.3V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
V
OUT
(AC)
50mV/DIV
LOAD STEP
10A/DIV
100µs/DIV
12V
IN
, 1.8V
OUT,
500kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/ s SLEW RATE
C
OUT
= 8× 220 F CERAMIC CAP
R
TH
= 3.32k, C
TH
= 6800pF C
FF
= 68pF
,
4650a1 G07
V
OUT
(AC)
50mV/DIV
LOAD STEP
10A/DIV
100µs/DIV
12V
IN
, 2.5V
OUT,
500kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/ s SLEW RATE
C
OUT
= 8× 220 F CERAMIC CAP
R
TH
= 3.32k, C
TH
= 6800pF C
FF
= 68pF
,
4650a1 G08
V
OUT
(AC)
50mV/DIV
LOAD STEP
10A/DIV
100µs/DIV
12V
IN
, 3.3V
OUT,
600kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/ s SLEW RATE
C
OUT
= 8× 220 F CERAMIC CAP
R
TH
= 3.32k, C
TH
= 6800pF C
FF
= 68pF
,
4650a1 G09
4650a1f
For more information
www.linear.com/LTM4650A-1
5
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