LTM8068
2.8V
IN
to 40V
IN
Isolated
µModule DC/DC Converter
with LDO Post Regulator
FeaTures
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DescripTion
The
LTM
®
8068
is a 2kV AC isolated flyback µModule
®
(power module) DC/DC converter with LDO post regulator.
Included in the package are the switching controller, power
switches, transformer, LDO, and all support components.
Operating over an input voltage range of 2.8V to 40V, the
LTM8068 supports an output voltage range of 2.5V to
18V, set by a single resistor. There is also a linear post
regulator whose output voltage is adjustable from 1.2V
to 18V as set by a single resistor. Only output and input
capacitors are needed to finish the design.
The LTM8068 is packaged in a thermally enhanced, com-
pact (9mm
×
11.25mm
×
4.92mm) overmolded ball grid
array (BGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8068 is
available with SnPb or RoHS compliant terminal finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
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2kVAC Isolated µModule Converter
UL60950 Recognized File E464570
Wide Input Voltage Range: 2.8V to 40V
V
OUT1
Output:
Up to 450mA (V
IN
= 24V
,
V
OUT1
= 5V)
2.5V to 18V Output Range
V
OUT2
Low Noise Linear Post Regulator:
Up to 300mA
1.2V to 18V Output Range
Current Mode Control
Programmable Soft-Start
User Configurable Undervoltage Lockout
Low Profile (9mm
×
11.25mm
×
4.92mm)
BGA Package
applicaTions
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Industrial Sensors
Industrial Switches
Ground Loop Mitigation
Typical applicaTion
2kV AC Isolated Low Noise µModule Regulator
350
V
IN
2.8V TO 38V
2.2µF
V
IN
RUN
V
OUT1
(5.6V)
22µF
LOAD CURRENT (mA)
V
OUT2
5V
300mA MAX
10µF
Total Output Current vs V
IN
•
•
LOW
NOISE
LDO
V
OUT2
FB2
V
OUTN
162k
250
FB1
7.32k
GND
LTM8068
150
8068 TA01a
PIN BYP IS NOT USED IN THIS SCHEMATIC
50
0
9
18
V
IN
(V)
27
36
8068 TA01
For more information
www.linear.com/LTM8068
1
8068f
LTM8068
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
A
B
C
D
E
F
G
H
3
4
5
6
7
BGA PACKAGE
38-LEAD (11.25mm
×
9mm
×
4.92mm)
T
JMAX
= 125°C,
θ
JA
= 18.2°C/W,
θ
JCbottom
= 4.8°C/W,
θ
JCtop
= 18.1°C/W,
θ
JB
= 4.8°C/W
WEIGHT = 1.1g,
θ
VALUES DETERMINED PER JEDEC 51-9, 51-12
1
2
BANK 5
V
IN
RUN
BANK 4
GND
FB1
V
IN
, RUN ..................................................................42V
V
OUT1
Relative to V
OUTN
............................................25V
V
IN
+ V
OUT1
(Note 2) .................................................45V
V
OUT2
Relative to V
OUTN
..........................................+20V
FB2 Relative to V
OUTN
...............................................+7V
GND to V
OUTN
Isolation (Note 3) ......................... 2kV AC
Maximum Internal Temperature (Note 4) .............. 125°C
Maximum Peak Body Reflow Temperature ........... 245°C
Storage Temperature.............................. –55°C to 125°C
FB2
BANK 3 BYP
V
OUT2
BANK 2
V
OUTN
BANK 1
V
OUT1
orDer inForMaTion
PART MARKING*
PART NUMBER
LTM8068EY#PBF
LTM8068IY#PBF
LTM8068IY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM8068Y
LTM8068Y
LTM8068Y
FINISH CODE
e1
e1
e0
PACKAGE
TYPE
BGA
BGA
BGA
MSL
RATING
3
3
3
TEMPERATURE RANGE
(Note 4)
–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
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For more information
www.linear.com/LTM8068
LTM8068
elecTrical characTerisTics
PARAMETER
Minimum Input DC Voltage
V
OUT1
DC Voltage
V
IN
Quiescent Current
V
OUT1
Line Regulation
V
OUT1
Load Regulation
V
OUT1
Ripple (RMS)
Isolation Voltage
Input Short-Circuit Current
RUN Pin Input Threshold
RUN Pin Current
LDO (V
OUT2
) Minimum Input DC Voltage
V
OUT2
Voltage Range
FB2 Pin Voltage
V
OUT2
Line Regulation
V
OUT2
Load Regulation
LDO Dropout Voltage
CONDITIONS
RUN = 2V
R
FB1
= 15.4k
R
FB1
= 8.25k
R
FB1
= 2.37k
V
RUN
= 0V
Not Switching
3V ≤ V
IN
≤ 40V, I
OUT
= 0.1A, RUN = 2V
0.05A ≤ I
OUT
≤ 0.3A, RUN = 2V
I
OUT
= 0.1A, 1MHz BW
(Note 3)
V
OUT1
Shorted
RUN Pin Falling
V
RUN
= 1V
V
RUN
= 1.3V
(Note 5)
V
OUT1
= 16V, R
FB2
Open, No Load (Note 5)
V
OUT1
= 16V, R
FB2
= 41.2k, No Load (Note 5)
V
OUT1
= 2V, I
OUT2
= 1mA (Note 5)
V
OUT1
= 2V, I
OUT2
= 1mA (Note 5)
2V < V
OUT1
< 16V, I
OUT2
= 1mA (Note 5)
V
OUT1
= 5V, 10mA ≤ I
OUT2
≤ 300mA (Note 5)
I
OUT2
= 10mA (Note 5)
I
OUT2
= 100mA (Note 5)
I
OUT2
= 300mA (Note 5)
C
BYP
= 0.01µF, I
OUT2
= 300mA, BW = 100Hz to 100kHz (Note 5)
20
l
l
l
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, RUN = 2V (Note 4).
MIN
TYP
2.5
5
18
7
1
1
30
2
80
1.18
1.214
2.5
1.5
1.22
17.7
1.19
1.22
1
2
1.25
5
10
0.25
0.34
0.43
1.25
0.1
2.3
MAX
2.8
4.75
5.25
3
UNITS
V
V
V
V
µA
mA
%
%
mV
kV
mA
V
µA
µA
V
V
V
V
V
mV
mV
V
V
V
µV
RMS
V
OUT2
Ripple (RMS)
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:
V
IN
+ V
OUT1
is defined as the sum of:
(V
IN
– GND) + (V
OUT1
– V
OUTN
)
Note 3:
The LTM8068 isolation test voltage of either 2kVAC or its
equivalent of 2.83kVDC is applied for one second.
Note 4:
The LTM8068E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C internal
temperature range are assured by design, characterization and correlation
with statistical process controls. LTM8068I is guaranteed to meet
specifications over the full –40°C to 125°C internal operating temperature
range. Note that the maximum internal temperature is determined by
specific operating conditions in conjunction with board layout, the rated
package thermal resistance and other environmental factors.
Note 5:
V
RUN
= 0V (Flyback not running), but the V
OUT2
post regulator is
powered by applying a voltage to V
OUT1
.
For more information
www.linear.com/LTM8068
3
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LTM8068
as in Table 1 (T
A
= 25°C).
Typical perForMance characTerisTics
80
Unless otherwise noted, operating conditions are
Efficiency vs Load Current,
V
OUT1
= 5V
Efficiency vs Load Current,
V
OUT1
= 2.5V
80
Efficiency vs Load Current,
V
OUT1
= 3.3V
90
70
EFFICIENCY (%)
EFFICIENCY (%)
70
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
50
100 150 200 250 300 350 400
LOAD CURRENT (mA)
8068 G02
80
60
70
60
50
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
50
100 150 200 250
LOAD CURRENT (mA)
300
350
60
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
100
200
300
400
LOAD CURRENT (mA)
500
600
8068 G03
40
50
50
30
40
40
8068 G01
Efficiency vs Load Current,
V
OUT1
= 8V
85
85
Efficiency vs Load Current,
V
OUT1
= 12V
85
Input Current vs Load Current,
V
OUT1
= 15V
75
EFFICIENCY (%)
EFFICIENCY (%)
75
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
50
100
150
200
LOAD CURRENT (mA)
250
300
8068 G05
75
65
65
65
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
0
50
100
150
200
LOAD CURRENT (mA)
250
8068 G06
55
45
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
100
200
300
400
LOAD CURRENT (mA)
500
8068 G04
55
45
55
100
Input Current vs Load Current,
V
OUT1
= 2.5
125
Input Current vs Load Current,
V
OUT1
= 3.3V
300
Input Current vs Load Current,
V
OUT1
= 5V
INPUT CURRENT (mA)
INPUT CURRENT (mA)
75
INPUT CURRENT (mA)
75
100
240
180
50
50
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
100
200
300
LOAD CURRENT (mA)
400
8068 G08
120
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
0
100
200
300
400
LOAD CURRENT (mA)
500
600
8068 G09
25
0
V
IN
IN
=5V
V = 5V
V
IN
IN
=12V
V = 12V
V
IN
IN
=24V
V = 24V
V
IN
IN
=36V
V = 36V
0
50
100 150 200 250
LOAD CURRENT (mA)
300
350
25
60
0
0
8068 G07
4
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For more information
www.linear.com/LTM8068
LTM8068
Typical perForMance characTerisTics
as in Table 1 (T
A
= 25°C).
400
Unless otherwise noted, operating conditions are
Input Current vs Load Current,
V
OUT1
= 15V
Input Current vs Load Current,
V
OUT1
= 8V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
400
Input Current vs Load Current,
V
OUT1
= 12V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
400
INPUT CURRENT (mA)
INPUT CURRENT (mA)
200
200
INPUT CURRENT (mA)
300
300
300
200
100
100
100
0
0
100
200
300
400
LOAD CURRENT (mA)
500
8068 G10
0
0
100
200
LOAD CURRENT (mA)
300
8068 G11
0
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
0
100
200
LOAD CURRENT (mA)
300
8068 G12
250
Input Current vs V
IN
,
V
OUT1
Shorted, V
OUT2
Open
450
Input Current vs V
IN
,
V
OUT2
Shorted
MAXIMUM LOAD CURRENT (mA)
500
Maximum Load Current vs V
OUT1
VV
IN
=5V
IN
= 5V
VV
IN
=12V
IN
= 12V
VV
IN
=24V
IN
= 24V
200
INPUT CURRENT (mA)
INPUT CURRENT (mA)
360
375
150
270
250
100
180
50
90
125
0
0
10
20
V
IN
(V)
30
40
8068 G13
0
0
10
20
V
IN
(V)
30
40
8067 G14
0
0
5
10
15
V
OUT1
(V)
20
25
8068 G15
400
MAXIMUM LOAD CURRENT (mA)
Maximum Load Current vs V
IN
MAXIMUM LOAD CURRENT (mA)
2.5V
OUT1
3.3V
OUT1
600
Maximum Load Current vs V
IN
MAXIMUM LOAD CURRENT (mA)
5V
OUT1
8V
OUT1
300
Maximum Load Current vs V
IN
12V
OUT1
15V
OUT1
300
400
200
200
200
100
100
0
10
20
V
IN
(V)
30
40
8068 G16
0
0
10
20
V
IN
(V)
30
40
8068 G17
0
0
10
20
V
IN
(V)
30
40
8068 G18
For more information
www.linear.com/LTM8068
5
8068f
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