ing mode DC/DC power supply. Included in the package
are the switching controller, power FETs, inductor, and all
support components. Operating over input voltage ranges
of 4.5V to 26.5V, the LTM4619 supports two outputs with
voltage ranges of 0.8V to 5V, each set by a single external
resistor. Its high efficiency design delivers 4A continuous
current (5A peak) for each output.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The two outputs are
interleaved with 180° phase to minimize the ripple noise and
reduce the I/O capacitors. The device supports frequency
synchronization and output voltage tracking for supply
rail sequencing. Burst Mode operation or pulse-skipping
mode can be selected for light load operations.
Fault protection features include overvoltage protection,
overcurrent protection and foldback current limit for
short-circuit protection.
The low profile package (2.8mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. The power module is offered in a
space saving and thermally enhanced 15mm
×
15mm
×
2.8mm LGA package. The LTM4619 is Pb-free and RoHS
compliant.
Complete Standalone Power Supply
Wide Input Voltage Range: 4.5V to 26.5V
(EXTV
CC
Available for V
IN
≤ 5.5V)
Dual 180° Out-of-Phase Outputs with 4A DC
Typical, 5A Peak Output Current for Each
Dual Outputs with 0.8V to 5V V
OUT
Range
Output Voltage Tracking
±1.5% Total DC Output Error
Current Mode Control/Fast Transient Response
Power Good
Phase-Lockable Fixed Frequency 250kHz to 780kHz
On Board Frequency Synchronization
Parallel Current Sharing
Selectable Burst Mode
®
Operation
Output Overvoltage Protection
Small Surface Mount Footprint, Low Profile
(15mm
×
15mm
×
2.8mm) LGA Package
APPLICATIONS
n
n
n
n
n
n
Telecom and Networking Equipment
Servers
Storage Cards
ATCA Cards
Industrial Equipment
Point of Load Regulation
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and μModule are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
Dual 4A 3.3V/2.5V DC/DC μModule
®
Regulator
MODE/PLLIN INTV
CC
FREQ/PLLFLTR
19.1k
EFFICIENCY (%)
V
FB2
COMP2
LTM4619
V
OUT2
TK/SS2
RUN2
EXTV
CC
PGND
4619 TA01a
Efficiency and Power Loss at 12V input
95
90
85
80
75
70
POWER LOSS
65
60
55
0
0.5
1
1.5 2 2.5 3
LOAD CURRENT (A)
2.5V
OUT
3.3V
OUT
3.5
4
0.5
1.0
EFFICIENCY
1.5
POWER LOSS (W)
2.0
5.5V TO 26.5V
10μF
2
28k
22pF
V
IN
V
FB1
COMP1
V
OUT1
22pF
V
OUT2
3.3V/4A
V
OUT1
2.5V/4A
100μF
0.1μF
TK/SS1
RUN1
PGOOD
SGND
100μF
0.1μF
0
4619 TA01b
4619f
1
LTM4619
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
M
L
K
J
H
G
F
E
D
C
B
A
1
2
3
4
5
6
7
8
9
10
11
12
V
IN
............................................................. –0.3V to 28V
INTV
CC
, PGOOD, RUN1, RUN2, EXTV
CC
....... –0.3V to 6V
COMP1, COMP2, V
FB1
, V
FB2
, .................... –0.3V to 2.7V
MODE/PLLIN, TK/SS1, TK/SS2,
FREQ/PLLFLTR ...................................... –0.3V to INTV
CC
V
OUT1
, V
OUT2
.................................................. 0.8V to 5V
Internal Operating Temperature Range (Note 2)
.......................................................... –40°C to 125°C
Junction Temperature ........................................... 125°C
Maximum Reflow Body Temperature .................... 245°C
Storage Temperature Range................... –55°C to 125°C
LGA PACKAGE
144-LEAD (15mm
×
15mm
×
2.8mm)
T
JMAX
= 125°C,
θ
JA
= 13°C/W,
θ
JP
= 6°C/W
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH 4 LAYERS
WEIGHT = 1.7g
ORDER INFORMATION
LEAD FREE FINISH
LTM4619EV#PBF
LTM4619IV#PBF
TRAY
LTM4619EV#PBF
LTM4619IV#PBF
PART MARKING*
LTM4619V
LTM4619V
PACKAGE DESCRIPTION
144-Lead (15mm
×
15mm
×
2.8mm) LGA
144-Lead (15mm
×
15mm
×
2.8mm) LGA
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application in Figure 18. Specified as
each channel. (Note 3)
SYMBOL
V
IN(DC)
V
OUT1, 2(RANGE)
V
OUT1, 2(DC)
PARAMETER
Input DC Voltage
Output Voltage Range
Output Voltage
CONDITIONS
V
IN
≤ 5.5V, Connect V
IN
and INTV
CC
Together
V
IN
= 5.5V to 26.5V
C
IN
= 10μF
×1,
C
OUT
= 100μF Ceramic, 100μF POSCAP
,
R
SET
= 28.0kΩ
V
IN
= 12V, V
OUT
= 2.5V, I
OUT
= 0A
V
IN
= 12V, V
OUT
= 2.5V, I
OUT
= 4A
l
l
ELECTRICAL CHARACTERISTICS
MIN
4.5
0.8
TYP
MAX
26.5
5.0
UNITS
V
V
l
2.483
2.470
2.00
1.85
2.52
2.52
2.2
2.0
2.557
2.570
2.35
2.15
V
V
V
V
4619f
Input Specifications
V
IN(UVLO)
Undervoltage Lockout Thresholds V
INTVCC
Rising
V
INTVCC
Falling
2
LTM4619
ELECTRICAL CHARACTERISTICS
SYMBOL
I
INRUSH(VIN)
I
Q(VIN)
PARAMETER
Input Inrush Current at Start-Up
Input Supply Bias Current
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application in Figure 18. Specified as
each channel (Note 3).
CONDITIONS
I
OUT
= 0A, C
IN
= 10μF C
OUT
= 100μF V
OUT
= 2.5V
,
,
V
IN
= 12V
V
IN
= 12V, V
OUT1
= 2.5V, Switching Continuous
V
IN
= 12V, V
OUT2
= 2.5V, Switching Continuous
V
IN
= 26.5V, V
OUT1
= 2.5V, Switching Continuous
V
IN
= 26.5V, V
OUT2
= 2.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 20V
V
IN
= 12V, V
OUT
= 2.5V, I
OUT
= 4A
V
IN
= 26.5V, V
OUT
= 2.5V, I
OUT
= 4A
V
IN
= 12V, V
RUN
> 2V, No Load
EXTV
CC
Ramping Positive
l
MIN
TYP
0.25
30
30
40
40
40
0.97
0.480
MAX
UNITS
A
mA
mA
mA
mA
μA
A
A
I
S(VIN)
INTV
CC
EXTV
CC
Output Specifications
I
OUT1, 2(DC)
ΔV
OUT1(LINE)
V
OUT(NOM)
ΔV
OUT2(LINE)
V
OUT(NOM)
ΔV
OUT1(LOAD)
V
OUT1(NOM)
ΔV
OUT2(LOAD)
V
OUT2(NOM)
V
OUT1, 2(AC)
Input Supply Current
Internal V
CC
Voltage
EXTV
CC
Switchover Voltage
4.8
4.5
0
l
l
l
l
5
4.7
5.2
V
V
Output Continuous Current Range V
IN
= 12V, V
OUT
= 2.5V (Note 5)
Line Regulation Accuracy
Line Regulation Accuracy
Load Regulation Accuracy
Load Regulation Accuracy
Output Ripple Voltage
V
OUT
= 2.5V, V
IN
from 6V to 26.5V
I
OUT
= 0A For Each Output
V
OUT
= 2.5V, V
IN
from 6V to 26.5V
I
OUT
= 0A For Each Output
For Each Output, V
OUT
= 2.5V, 0A to 4A (Note 5)
V
IN
= 12V
For Each Output, V
OUT
= 2.5V, 0A to 4A (Note 5)
V
IN
= 12V
I
OUT
= 0A, C
OUT
= 100μF X5R Ceramic
V
IN
= 12V, V
OUT
= 2.5V
V
IN
= 26.5V, V
OUT
= 2.5V
I
OUT
= 2A, V
IN
= 12V, V
OUT
= 2.5V
FREQ/PLLFLTR = INTV
CC
C
OUT
= 100μF X5R Ceramic, V
OUT
= 2.5V, I
OUT
= 0A
V
IN
= 12V
V
IN
= 26.5V
C
OUT
= 100μF X5R Ceramic, V
OUT
= 2.5V, I
OUT
= 0A
Resistive Load,
V
IN
= 12V
V
IN
= 26.5V
Load: 0% to 50% to 0% of Full Load
C
OUT
= 100μF X5R Ceramic,V
OUT
= 2.5V, V
IN
= 12V
Load: 0% to 50% to 0% of Full Load
C
OUT
= 100μF X5R Ceramic,V
OUT
= 2.5V, V
IN
= 12V
C
OUT
= 100μF X5R Ceramic,
V
IN
= 6V, V
OUT
= 2.5V
V
IN
= 26.5V, V
OUT
= 2.5V
I
OUT
= 0A, V
OUT
= 2.5V
V
TK/SS
= 0V, V
OUT
= 2.5V
In Dropout (Note 4)
(Note 4)
4
0.15
0.25
0.15
0.25
0.6
0.6
0.3
0.5
0.3
0.5
0.8
0.8
A
%
%
%
%
±%
±%
20
25
780
mV
mV
kHz
f
S
ΔV
OUTSTART
Output Ripple Voltage Frequency
Turn-On Overshoot
10
10
mV
mV
t
START
Turn-On Time
0.250
0.130
15
10
12
11
0.792
0.788
0.9
0.8
0.8
1.3
97
90
0.808
0.810
1.7
ms
ms
mV
μs
A
A
V
μA
%
ns
4619f
ΔV
OUTLS
t
SETTLE
I
OUTPK
Peak Deviation for Dynamic Load
Settling Time for Dynamic Load
Step
Output Current Limit
Control Section
V
FB1
, V
FB2
I
TK/SS1, 2
DF
MAX
t
ON(MIN)
Voltage at V
FB
Pin
Soft-Start Charge Current
Maximum Duty Factor
Minimum On-Time
l
3
LTM4619
ELECTRICAL CHARACTERISTICS
SYMBOL
f
NOM
f
LOW
f
HIGH
R
MODE/PLLIN
I
FREQ
PARAMETER
Nominal Frequency
Lowest Frequency
Highest Frequency
MODE/PLLIN Input Resistance
Frequency Setting
Sinking Current
Sourcing Current
RUN Pin ON/OFF Threshold
Resistor Between V
OUT
and V
FB
Pins for Each Channel
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Range
I
PGOOD
= 2mA
V
PGOOD
= 5V
V
FB
Ramping Negative
V
FB
Ramping Positive
–5
5
–7.5
7.5
f
MODE
> f
OSC
f
MODE
< f
OSC
RUN Rising
RUN Falling
1.1
1.02
60.1
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application in Figure 18. Specified as
each channel. (Note 3)
CONDITIONS
V
FREQ
= 1.2V
V
FREQ
= 0V
V
FREQ
≥ 2.4V
MIN
450
210
700
TYP
500
250
780
250
–13
13
1.22
1.14
60.4
0.1
1.35
1.27
60.7
0.3
±2
–10
10
MAX
550
290
860
UNITS
kHz
kHz
kHz
kΩ
μA
μA
V
V
kΩ
V
μA
%
%
V
RUN1, 2
R
FB1
, R
FB2
V
PGL
I
PGOOD
ΔV
PGOOD
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 LTM4619E 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 LTM4619I is guaranteed to meet specifications over the full
internal operating temperature range. Note that the maximum ambient
temperature is determined by specific operating conditions in conjunction
with board layout, the rated package thermal resistance and other
environmental factors.
Note 3:
The two outputs are tested separately and the same testing
condition is applied to each output.
Note 4:
100% tested at wafer level only.
Note 5:
See Output Current Derating curves for different V
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