LTM8047
3.1V
IN
to 32V
IN
Isolated
µModule DC/DC Converter
FEATURES
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DESCRIPTION
The
LTM
®
8047
is an isolated flyback µModule DC/DC
converter. The LTM8047 has an isolation rating of 725VDC.
For a similar product with LDO post regulator, see the
LTM8048. Included in the package are the switching
controller, power switches, transformer, and all support
components. Operating over an input voltage range of 3.1V
to 32V, the LTM8047 supports an output voltage range of
2.5V to 12V, set by a single resistor. Only output, input,
and bypass capacitors are needed to finish the design.
Other components may be used to control the soft-start
control and biasing.
The LTM8047 is packaged in a thermally enhanced, com-
pact (11.25mm
×
9mm
×
4.92mm) over-molded ball grid
array (BGA) package suitable for automated assembly by
standard surface mount equipment. The LTM8047 is avail-
able with SnPb (BGA) 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.
Complete Switch Mode Power Supply
725VDC Isolation
Wide Input Voltage Range: 3.1V to 32V
Up to 440mA Output Current (V
OUT
= 2.5V)
2.5V to 12V Output Voltage
Current Mode Control
Programmable Soft-Start
User Configurable Undervoltage Lockout
SnPb or RoHS Compliant Finish
Low Profile (11.25mm
×
9mm
×
4.92mm) Surface
Mount BGA Package
APPLICATIONS
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Industrial Sensors
Industrial Switches
Ground Loop Mitigation
TYPICAL APPLICATION
725V DC Isolated Low Noise µModule Regulator
V
IN
3.1V TO 29V
LTM8047
ISOLATION BARRIER
2.2µF
4.7µF
V
IN
RUN
BIAS
6.98k
ADJ
SS
GND
V
OUT
V
OUT
5V
280mA
(15V
IN
)
22µF
Maximum Load vs V
IN
400
350
300
250
200
150
100
V
OUT–
8047 TA01
725VDC ISOLATION
MAXIMUM V
OUT
LOAD (mA)
0
5
10
15
V
IN
(V)
20
25
30
8047 TA01b
8047fc
For more information
www.linear.com/LTM8047
1
LTM8047
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
A
B
C
D
E
F
G
H
1
2
3
4
BANK 3
V
IN
RUN
BANK 2
V
OUT–
BANK 1
V
OUT
BANK 4
GND
ADJ
BIAS SS
5
6
7
V
IN
, RUN, BIAS ........................................................32V
ADJ, SS.......................................................................5V
V
OUT
Relative to V
OUT–
..............................................16V
(V
IN
– GND) + (V
OUT
– V
OUT–
) ...................................36V
BIAS Above V
IN
........................................................ 0.1V
GND to V
OUT–
Isolation (Note 2) ........................ 725VDC
Maximum Internal Temperature (Note 3) .............. 125°C
Maximum Solder Temperature .............................. 250°C
BGA PACKAGE
45-LEAD (11.25mm
×
9mm
×
4.92mm)
T
JMAX
= 125°C,
θ
JA
= 16°C/W,
θ
JCbottom
= 4.1°C/W,
θ
JCtop
= 15°C/W,
θ
JB
= 4°C/W
WEIGHT = 1.1g,
θ
VALUES DETERMINED PER JEDEC 51-9, 51-12
ORDER INFORMATION
PART NUMBER
LTM8047EY#PBF
LTM8047IY#PBF
LTM8047MPY#PBF
LTM8047MPY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
PART MARKING*
DEVICE
LTM8047Y
LTM8047Y
LTM8047Y
LTM8047Y
CODE
e1
e1
e1
e0
PACKAGE
TYPE
BGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
TEMPERATURE RANGE
(Note 3)
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°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.
• Pb-free and Non-Pb-free Part Markings:
www.linear.com/leadfree
• Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
• BGA Package and Tray Drawings:
www.linear.com/packaging
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input DC Voltage
V
OUT
DC Voltage
V
IN
Quiescent Current
V
OUT
Line Regulation
CONDITIONS
BIAS = V
IN
R
ADJ
= 12.4k
R
ADJ
= 6.98k
R
ADJ
= 3.16k
V
RUN
= 0V
Not Switching
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, RUN = 12V (Note 3).
MIN
l
l
TYP
2.5
5
12
850
1.7
MAX
3.1
UNITS
V
V
V
V
µA
µA
%
4.75
5.25
1
6V ≤ V
IN
≤ 31V, I
OUT
= 0.15A
8047fc
2
For more information
www.linear.com/LTM8047
LTM8047
ELECTRICAL CHARACTERISTICS
PARAMETER
V
OUT
Load Regulation
V
OUT
Ripple (RMS)
Input Short Circuit Current
RUN Pin Input Threshold
RUN Pin Current
SS Threshold
SS Sourcing Current
BIAS Current
Minimum BIAS Voltage (Note 4)
SS = 0V
V
IN
= 12V, BIAS = 5V, I
LOAD1
= 100mA
I
LOAD1
= 100mA
CONDITIONS
0.05A ≤ I
OUT
≤ 0.2A
I
OUT
= 0.1A
V
OUT
Shorted
RUN Pin Rising
V
RUN
= 1V
V
RUN
= 1.3V
1.18
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, RUN = 12V (Note 3).
MIN
TYP
1.5
20
30
1.24
2.5
0.1
0.7
–10
8
3.1
1.30
MAX
UNITS
%
mV
mA
V
µA
µA
V
µA
mA
V
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 LTM8047 isolation is tested at 725VDC for one second in each
polarity.
Note 3:
The LTM8047E 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. LTM8047I is guaranteed to meet
specifications over the full –40°C to 125°C internal operating temperature
range. The LTM8047MP is guaranteed to meet specifications over the
full –55°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 4:
This is the BIAS pin voltage at which the internal circuitry is
powered through the BIAS pin and not the integrated regulator. See BIAS
Pin Considerations for details.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load
90
V
OUT
= 2.5V
BIAS = 5V
90
Efficiency vs Load
V
OUT
= 3.3V
BIAS = 5V
12V
IN
EFFICIENCY (%)
90
Efficiency vs Load
V
OUT
= 5V
BIAS = 5V
12V
IN
80
EFFICIENCY (%)
EFFICIENCY (%)
12V
IN
80
80
24V
IN
70
70
24V
IN
60
70
24V
IN
60
60
50
0
100
300
200
400
V
OUT
CURRENT (mA)
500
8047 G01
50
0
100
300
200
V
OUT
CURRENT (mA)
400
8047 G02
50
0
50
100 150 200 250
V
OUT
CURRENT (mA)
300
350
8047 G03
8047fc
For more information
www.linear.com/LTM8047
3
LTM8047
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load
100
V
OUT
= 8V
BIAS = 5V
100
Efficiency vs Load
V
OUT
= 12V
BIAS = 5V
8.5
BIAS Current vs V
OUT
Load
12V
IN
V
OUT
= 2.5V
8.0 BIAS = 5V
7.5
BIAS CURRENT (mA)
12V
IN
7.0
6.5
6.0
5.5
5.0
4.5
90
EFFICIENCY (%)
EFFICIENCY (%)
12V
IN
80
90
24V
IN
24V
IN
80
24V
IN
70
70
60
0
50
100 150 200 250
V
OUT
CURRENT (mA)
300
350
60
0
50
8047 G04
150
200
100
V
OUT
CURRENT (mA)
250
8047 G05
4.0
0
100
200
300
400
V
OUT
CURRENT (mA)
500
8047 G06
8.5
BIAS Current vs V
OUT
Load
12V
IN
V
OUT
= 3.3V
8.0 BIAS = 5V
7.5
BIAS CURRENT (mA)
10
9
BIAS CURRENT (mA)
8
7
6
5
4
BIAS Current vs V
OUT
Load
V
OUT
= 5V
BIAS = 5V
12V
IN
BIAS CURRENT (mA)
12
BIAS Current vs V
OUT
Load
12V
IN
V
OUT
= 8V
11 BIAS = 5V
10
9
8
7
6
5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
0
24V
IN
24V
IN
24V
IN
100
300
200
V
OUT
CURRENT (mA)
400
8047 G07
0
50
100 150 200 250
V
OUT
CURRENT (mA)
300
350
4
0
50
8047 G08
100 150 200 250
V
OUT
CURRENT (mA)
300
350
8047 G09
13
BIAS Current vs V
OUT
Load
12V
IN
MAXIMUM V
OUT
LOAD (mA)
V
OUT
= 12V
12 BIAS = 5V
11
BIAS CURRENT (mA)
10
9
8
7
6
5
4
0
50
500
Maximum Load vs V
IN
BIAS = V
IN
IF V
IN
≤ 5V
BIAS = 5V IF V
IN
> 5V
450
400
350
300
250
200
150
2.5V
OUT
3.3V
OUT
5V
OUT
0
5
10
15
V
IN
(V)
20
25
30
8047 G11
350
300
MAXIMUM V
OUT
LOAD (mA)
250
200
150
100
50
0
Maximum Load vs V
IN
BIAS = V
IN
IF V
IN
≤ 5V
BIAS = 5V IF V
IN
> 5V
24V
IN
100
150
200
V
OUT
CURRENT (mA)
250
8047 G10
100
8V
OUT
12V
OUT
0
5
10
15
V
IN
(V)
20
25
8047 12
8047fc
4
For more information
www.linear.com/LTM8047
LTM8047
TYPICAL PERFORMANCE CHARACTERISTICS
40
35
MINIMUM V
OUT
LOAD (mA)
30
25
20
15
10
5
0
0
5
10
15
V
IN
(V)
20
25
30
8047 G13
Minimum Load vs V
IN
2.5V
OUT
3.3V
OUT
5V
OUT
15
Minimum Load vs V
IN
8V
OUT1
12V
OUT1
INPUT CURRENT (mA)
0
5
10
15
V
IN
(V)
20
25
30
8047 G14
80
70
60
50
40
30
20
10
Input Current vs V
IN
V
OUT
Shorted
MINIMUM V
OUT1
LOAD (mA)
12
9
6
3
0
0
4
8
12
16 20
V
IN
(V)
24
28
32
8047 G15
Junction Temperature Rise vs
Load Current
8
7
TEMPERATURE RISE (°C)
TEMPERATURE RISE (°C)
6
5
4
3
2
1
0
0
50
3.3V
IN
5V
IN
12V
IN
24V
IN
100 150 200 250 300 350 400
V
OUT
LOAD CURRENT (mA)
8047 G16
Junction Temperature Rise vs
Load Current
9
8
7
6
5
4
3
2
1
0
0
50
3.3V
IN
5V
IN
12V
IN
24V
IN
100 150 200 250 300 350 400
V
OUT
LOAD CURRENT (mA)
8047 G17
Junction Temperature Rise vs
Load Current
10
9
TEMPERATURE RISE (°C)
8
7
6
5
4
3
2
1
0
0
50
3.3V
IN
5V
IN
12V
IN
24V
IN
100 150 200 250 300
V
OUT
LOAD CURRENT (mA)
350
V
OUT
= 5V
V
OUT
= 2.5V
V
OUT
= 3.3V
8047 G18
Junction Temperature Rise vs
Load Current
12
10
TEMPERATURE RISE (°C)
TEMPERATURE RISE (°C)
8
6
4
2
0
3.3V
IN
5V
IN
12V
IN
24V
IN
0
50
100
150
200
250
V
OUT
LOAD CURRENT (mA)
300
8047 G19
Junction Temperature Rise vs
Load Current
12
10
8
6
4
2
0
3.3V
IN
5V
IN
12V
IN
24V
IN
0
50
100
150
200
V
OUT
LOAD CURRENT (mA)
250
8047 G20
Output Noise and Ripple
V
OUT
= 8V
V
OUT
= 12V
10mV/DIV
2µs/DIV
12V
IN
, 5V
OUT
at 250mA
0.1 F 250V SAFETY CAPACITOR APPLIED
BETWEEN GND AND V
OUT–
8047 G21
8047fc
For more information
www.linear.com/LTM8047
5
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