regulator. Included in the package are the switching con-
trollers, power FETs, inductors, and all supporting com-
ponents. Operating from an input voltage range of 4.5V
to 15V, the LTM4650 supports two outputs each with an
output voltage range of 0.6V to 1.8V, each set by a single
external resistor. Its high efficiency design delivers up to
25A continuous current for each output. Only a few input
and output capacitors are needed. The LTM4650 is pin
compatible with the LTM4620 (dual 13A, single 26A) and
the LTM4630 (dual 18A, single 36A).
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing and 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
overcurrent protection. The LTM4650 is offered in a
16mm × 16mm
×
5.01mm BGA package.
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.
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Dual 25A or Single 50A Output
Input Voltage Range: 4.5V to 15V
Output Voltage Range: 0.6V to 1.8V
±1.5% Maximum Total DC Output Error Over Line,
Load and Temperature
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Adjustable Switching Frequency
Frequency Synchronization
Overcurrent Foldback Protection
Multiphase Parallel Current Sharing with Multiple
LTM4650s Up to 300A
Internal Temperature Monitor
Pin Compatible with the LTM4620 (Dual 13A, Single
26A) and LTM4630 (Dual 18A, Single 36A)
Selectable Burst Mode
®
Operation
Soft-Start/Voltage Tracking
Output Overvoltage Protection
16mm
×
16mm
×
5.01mm BGA Package
APPLICATIONS
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Processor, ASIC and FPGA Core Power
Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
TYPICAL APPLICATION
50A, 1.2V Output DC/DC µModule Regulator
V
IN
4.5V TO
15V
22µF
* 25V
×4
V
IN
120k
TEMP
RUN1
RUN2
TRACK1
0.1µF
4.7µF
PINS NOT USED
IN THIS CIRCUIT:
CLKOUT
EXTV
CC
SW1
SW2
V
OUTS1
10k
PGOOD1
PGOOD2
f
SET
121k
TRACK2
INTV
CC
COMP1
COMP2
DIFFP
V
OUT2
V
OUT2
1.2V
50A
4650 TA01a
1.2V
OUT
Efficiency vs I
OUT
95
220µF
CERAMIC
4V
×8
V
OUT1
DIFFOUT
V
OUTS2
LTM4650
V
FB1
V
FB2
60.4k
f
SW
= 500KHz
90
EFFICIENCY (%)
85
80
75
70
65
470pF
V
IN
= 12V
V
IN
= 5V
0
10
20
30
LOAD CURRENT (A)
40
50
4650 TA01b
PHASMD SGND GND MODE_PLLIN DIFFN
Document Feedback
For more information
www.analog.com
1
Rev. C
LTM4650
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
TEMP
M
L
K
J
V
IN
..............................................................–0.3V to 16V
V
SW1
, V
SW2
....................................................–1V to 16V
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
COMP1, COMP2, V
FB1
, V
FB2
(Note 5) ........ –0.3V to 2.7V
INTV
CC
Peak Output Current ................................100mA
Internal Operating Temperature Range (Note 2)
LTM4650E, LTM4650I ....................... –40°C to 125°C
LTM4650MP ...................................... –55°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Peak Package Body Temperature .......................... 245°C
EXTV
CC
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
GND
A
1
2
3
4
5
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 = 3.2g
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM4650EY#PBF
LTM4650IY#PBF
LTM4650IY
LTM4650MPY#PBF
LTM4650MPY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM4650Y
LTM4650Y
LTM4650Y
LTM4650Y
LTM4650Y
FINISH CODE
e1
e1
e0
e1
e0
PACKAGE
TYPE
BGA
BGA
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
–55°C to 125°C
–55°C to 125°C
Contact the factory 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.
•
Recommended LGA and BGA PCB Assembly and Manufacturing Procedures
•
LGA and BGA Package and Tray Drawings
2
Rev. C
For more information
www.analog.com
LTM4650
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
Input Supply Bias Current
RUN Rising
I
OUT
= 0A, C
IN
= 22µF × 3, C
SS
= 0.01µF,
C
OUT
= 100µF × 3, V
OUT1
= 1.5V, V
OUT2
= 1.5V
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
= 4.5V, 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 6)
V
OUT
= 1.2V, V
IN
from 4.5V to 15V
I
OUT
= 0A for Each Output,
For Each Output, V
OUT
= 1.2V, 0A to 25A
V
IN
= 12V (Note 6)
For Each Output, I
OUT
= 0A, C
OUT
= 100µF × 3
Ceramic, 470µF POSCAP V
IN
= 12V,
,
V
OUT
= 1.2V, Frequency = 500kHz
V
IN
= 12V, V
OUT
= 1.2V, f
SET
= 1.25V (Note 4)
400
,
C
OUT
= 100µF Ceramic, 470µF POSCAP V
OUT
=
1.2V, I
OUT
= 0A V
IN
= 12V
C
OUT
= 100µF 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 Ceramic, 470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load,
V
IN
= 12V, C
OUT
= 100µF, 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 22.
PARAMETER
Input DC Voltage
Output DC Voltage
Output Voltage, Total Variation with
Line and Load (Note 7)
C
IN
= 22µF
×
3, C
OUT
= 100µF
×
2 Ceramic,
470µF POSCAP
V
OUT
= 1.2V, I
OUT
= 0A to 25A
CONDITIONS
l
l
l
MIN
4.5
0.6
1.182
TYP
MAX
15
1.8
UNITS
V
V
V
1.2
1.218
1.1
1.25
150
1
4.5
25
240
35
8.4
3.2
1.40
V
mV
A
mA
mA
mA
µA
A
A
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis
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
0
0.01
0.5
15
25
0.1
0.75
A
%/V
%
mV
P-P
kHz
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)
Output Ripple Voltage Frequency
SYNC Capture Range
Turn-On Overshoot
Turn-On Time
500
780
kHz
mV
ms
Peak Deviation for Dynamic Load
30
mV
Settling Time for Dynamic Load
Step
Output Current Limit
20
35
µs
A
For more information
www.analog.com
3
Rev. C
LTM4650
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 22.
SYMBOL
Control Section
V
FB1
, V
FB2
I
FB
V
OVL
TRACK1 (I),
TRACK2 (I)
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
< 15V
I
CC
= 0mA to 50mA
EXTV
CC
Ramping Positive
I
CC
= 20mA, V
EXTVCC
= 5V
4.5
4.8
–10
10
5
0.75
4.7
50
220
f
SET
= 1.2V
f
SET
= 0.93V
f
SET
> 2.4V, Up to INTV
CC
9
PHASMD = GND
PHASMD = Float
PHASMD = INTV
CC
2
450
500
400
780
10
250
60
90
120
0.2
11
550
100
5.2
2
(Note 5)
60.05
Feedback Overvoltage Lockout
Track Pin Soft-Start Pull-Up Current
Undervoltage Lockout (Falling)
TRACK1 (I),TRACK2 (I) Start at 0V
Voltage at V
FB
Pins
I
OUT
= 0A, V
OUT
= 1.2V
(Note 5)
l
l
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
0.594
0.64
1
TYP
0.600
–5
0.66
1.25
3.3
0.6
90
60.4
0.1
MAX
0.606
–20
0.68
1.5
UNITS
V
nA
V
µA
V
V
ns
60.75
0.3
±5
kΩ
V
µA
%
%
V
%
V
mV
mV
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
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
Oscillator and Phase-Locked Loop
CLK High
CLK Low
4
Rev. C
For more information
www.analog.com
LTM4650
ELECTRICAL CHARACTERISTICS
SYMBOL
Differential Amplifier
A
V
Differential
Amplifier
R
IN
V
OS
PSRR Differential
Amplifier
I
CL
V
OUT(MAX)
GBW
V
TEMP
TC
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
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 22.
PARAMETER
CONDITIONS
MIN
TYP
1
Measured at DIFFP Input
V
DIFFP
= V
DIFFOUT
= 1.5V, I
DIFFOUT
= 100µA
5V < V
IN
< 15V
90
3
I
DIFFOUT
= 300µA
INTV
CC
– 1.4
3
0.6
–2.2
80
3
MAX
UNITS
V/V
kΩ
mV
dB
mA
V
MHz
V
mV/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 LTM4650 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4650E 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
LTM4650I is guaranteed over the full –40°C to 125°C internal operating
temperature range. The LTM4650MP is tested and guaranteed over
the –55°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:
LTM4650 device is designed to operate from 400kHz to 750kHz.
Note 5:
These parameters are tested at wafer sort.
Note 6:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 7:
Total DC output voltage error includes all errors over temperature:
line and load regulation as well as the tolerance of the integrated top
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