FEATURES
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LTM8045
Inverting or SEPIC µModule
DC/DC Converter with Up
to 700mA Output Current
DESCRIPTION
The
LTM
®
8045
is a µModule
®
(micromodule) DC/DC
converter that can be configured as a SEPIC or inverting
converter by simply grounding the appropriate output rail.
In a SEPIC configuration the regulated output voltage can
be above, below or equal to the input voltage. The LTM8045
includes power devices, inductors, control circuitry and
passive components. All that is needed to complete the
design are input and output capacitors, and small resis-
tors to set the output voltage and switching frequency.
Other components may be used to control the soft-start
and undervoltage lockout.
The LTM8045 is packaged in a compact (6.25mm ×
11.25mm) overmolded ball grid array (BGA) package suit-
able for automated assembly by standard surface mount
equipment. The LTM8045 is available with SnPb (BGA)
or RoHS compliant terminal finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
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SEPIC or Inverting Topology
Wide Input Voltage Range: 2.8V to 18V
Up to 700mA Output Current at V
IN
= 12V,
V
OUT
= 2.5V or –2.5V
Up to 375mA Output Current at V
IN
= 12V,
V
OUT
=15V or –15V
2.5V to 15V or –2.5V to –15V Output Voltage
Selectable Switching Frequency: 200kHz to 2MHz
Programmable Soft-Start
User Configurable Undervoltage Lockout
6.25mm × 11.25mm × 4.92mm BGA Package
APPLICATIONS
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Battery Powered Regulator
Local Negative Voltage Regulator
Low Noise Amplifier Power
TYPICAL APPLICATION
Use Two LTM8045s to Generate ±5V
LTM8045
V
IN
2.8VDC TO 18VDC
4.7µF
V
IN
V
OUT
–
V
OUT
–5V
60.4k
OUTPUT CURRENT (mA)
FB
GND
V
OUT
+
22µF
Maximum Output Current
vs Input Voltage
800
700
600
500
400
300
200
100
2
4
6
±2.5V
OUT
±3.3V
OUT
±5V
OUT
±8V
OUT
±12V
OUT
±15V
OUT
8
10 12 14
INPUT VOLTAGE (V)
16
18
•
RUN
SS
RT
130k
SYNC
LTM8045
V
IN
•
V
OUT
–
•
RUN
SS
RT
115k
SYNC
GND
For more information
www.linear.com/LTM8045
•
FB
V
OUT
+
8045 TA01b
100µF
45.3k
V
OUT
5V
8045 TA01b
8045fb
1
LTM8045
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V
OUT–
BANK 1
5
4
3
V
OUT+
BANK 2
2
1
A
B
C
D
E
F
G
H
GND
FB
BANK 3
V
IN
, RUN ...................................................................20V
RT, SYNC ....................................................................5V
SS, FB ......................................................................2.5V
V
OUT+
(V
OUT–
= 0V) ...................................................16V
V
OUT–
(V
OUT+
= 0V) ................................................. –16V
Maximum Internal Temperature ............................ 125°C
Maximum Solder Temperature .............................. 250°C
Storage Temperature.............................. –55°C to 125°C
V
IN
BANK 4
RUN
SYNC
SS RT
BGA PACKAGE
40-LEAD (11.25mm
×
6.25mm
×
4.92mm)
T
JMAX
= 125°C,
θ
JA
= 28.7°C/W,
θ
JB
= 7.6°C/W,
θ
JCtop
= 40.3°C/W,
θ
JCbottom
= 10.5°C/W
θ
VALUES DETERMINED PER JEDEC 51-9, 51-12
WEIGHT = 0.9g
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM8045EY#PBF
LTM8045IY#PBF
LTM8045IY
LTM8045MPY#PBF
LTM8045MPY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM8045Y
LTM8045Y
LTM8045Y
LTM8045Y
LTM8045Y
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
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
8045fb
2
For more information
www.linear.com/LTM8045
LTM8045
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. RUN = 12V unless otherwise specified. (Note 2)
PARAMETER
Input DC Voltage
Positive Output DC Voltage
Negative Output DC Voltage
Continuous Output DC Current
V
IN
Quiescent Current
Line Regulation
Load Regulation
Output RMS Voltage Ripple
Input Short-Circuit Current
Switching Frequency
Voltage at FB Pin (Positive Output)
Voltage at FB Pin (Negative Output)
Current into FB Pin (Positive Output)
Current into FB Pin (Negative Output)
RUN Pin Threshold Voltage
RUN Pin Current
RUN Pin Rising
RUN Pin Falling
V
RUN
= 3V
V
RUN
= 1.3V
V
RUN
= 0V
SS = 0V
I
OUT
= 0.7A, R
FB
= 15.4kΩ, V
OUT–
Grounded
I
OUT
= 0.375A, R
FB
=165kΩ, V
OUT–
Grounded
I
OUT
= 0.7A, R
FB
= 30.0kΩ, V
OUT+
Grounded
I
OUT
= 0.375A, R
FB
=178kΩ, V
OUT+
Grounded
V
IN
= 12V, V
OUT
= 2.5V or –2.5V
V
IN
= 12V, V
OUT
= 15V or –15V
V
RUN
= 0V
Not Switching
4V ≤ V
IN
≤ 18V, I
OUT
= 0.2A
0.01A ≤ I
OUT
≤ 0.58A
V
IN
= 12V, V
OUT
= 5V, I
OUT
= 580mA, 100kHz to 4MHz
V
OUT+
= V
OUT–
= 0V, V
IN
= 12V
R
T
= 45.3k
R
T
= 464k
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
TYP
2.5
15
–2.5
–15
MAX
18
UNITS
V
V
V
V
V
2.8
0.7
0.375
0
10
0.6
0.2
4
200
1800
180
1.195
0
81
81
1.235
9.7
5
200
35
0.4
1.3
2000
200
1.215
5
83.3
83.3
1.32
1.29
40
11.6
0
8
2200
220
1.235
12
86
86.5
1.385
60
13.4
0.1
13
2000
65
1
A
A
µA
mA
%
%
mV
mA
kHz
kHz
V
mV
µA
µA
V
V
µA
µA
µA
µA
kHz
%
V
V
SS Sourcing Current
Synchronization Frequency Range
Synchronization Duty Cycle
SYNC Input Low Threshold
SYNC Input High Threshold
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 LTM8045E 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. LTM8045I is guaranteed to meet
specifications over the full –40°C to 125°C internal operating temperature
range. The LTM8045MP 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 3:
This μModule converter includes overtemperature protection that
is intended to protect the device during momentary overload conditions.
Internal temperature will exceed 125°C when overtemperature protection
is active. Continuous operation above the specified maximum internal
operating junction temperature may impair device reliability.
8045fb
For more information
www.linear.com/LTM8045
3
LTM8045
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency
2.5V
OUT
SEPIC
80
70
60
EFFICIENCY (%)
EFFICIENCY (%)
50
40
30
20
10
0
0
3.3V
IN
5V
IN
12V
IN
18V
IN
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G01
Efficiency
3.3V
OUT
SEPIC
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
3.3V
IN
5V
IN
12V
IN
18V
IN
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G02
Efficiency
5V
OUT
SEPIC
90
80
70
60
50
40
30
20
10
0
0
100
200 300 400 500
OUTPUT CURRENT (mA)
3.3V
IN
5V
IN
12V
IN
18V
IN
600
700
8045 G03
Efficiency
8V
OUT
SEPIC
90
80
70
EFFICIENCY (%)
EFFICIENCY (%)
60
50
40
30
20
10
0
0
100
3.3V
IN
5V
IN
12V
IN
18V
IN
200
300
400
500
OUTPUT CURRENT (mA)
600
8045 G04
90
80
70
Efficiency
12V
OUT
SEPIC
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
Efficiency
15V
OUT
SEPIC
60
50
40
30
20
10
0
0
3.3V
IN
5V
IN
12V
IN
18V
IN
100
200
300
400
OUTPUT CURRENT (mA)
500
8045 G05
5V
IN
12V
IN
18V
IN
0
100
200
300
400
OUTPUT CURRENT (mA)
500
8045 G06
80
70
60
EFFICIENCY (%)
50
40
30
20
10
0
Efficiency
–2.5V
OUT
Inverting Converter
90
80
70
EFFICIENCY (%)
Efficiency
–3.3V
OUT
Inverting Converter
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
Efficiency
–5V
OUT
Inverting Converter
60
50
40
30
20
10
0
0
3.3V
IN
5V
IN
12V
IN
18V
IN
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G08
3.3V
IN
5V
IN
12V
IN
18V
IN
0
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G07
3.3V
IN
5V
IN
12V
IN
18V
IN
0
100
200 300 400 500
OUTPUT CURRENT (mA)
600
700
8045 G09
8045fb
4
For more information
www.linear.com/LTM8045
LTM8045
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency
–8V
OUT
Inverting Converter
90
80
70
EFFICIENCY (%)
EFFICIENCY (%)
60
50
40
30
20
10
0
0
100
3.3V
IN
5V
IN
12V
IN
18V
IN
200
300
400
500
OUTPUT CURRENT (mA)
600
8045 G10
Efficiency
–12V
OUT
Inverting Converter
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
3.3V
IN
5V
IN
12V
IN
18V
IN
100
200
300
400
OUTPUT CURRENT (mA)
500
8045 G11
Efficiency
–15V
OUT
Inverting Converter
90
80
70
60
50
40
30
20
10
0
0
5V
IN
12V
IN
18V
IN
100
200
300
400
OUTPUT CURRENT (mA)
500
8045 G12
Input Current vs Output Current,
2.5V
OUT
SEPIC
600
500
INPUT CURRENT (mA)
400
300
200
100
0
3.3V
IN
5V
IN
12V
IN
18V
IN
700
600
INPUT CURRENT (mA)
500
400
300
200
100
0
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G13
Input Current vs Output Current,
3.3V
OUT
SEPIC
3.3V
IN
5V
IN
12V
IN
18V
IN
800
700
INPUT CURRENT (mA)
600
500
400
300
200
100
0
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G14
Input Current vs Output Current,
5V
OUT
SEPIC
3.3V
IN
5V
IN
12V
IN
18V
IN
0
0
0
100
200 300 400 500
OUTPUT CURRENT (mA)
600
700
8045 G15
900
800
700
INPUT CURRENT (mA)
600
500
400
300
200
100
0
Input Current vs Output Current,
8V
OUT
SEPIC
3.3V
IN
5V
IN
12V
IN
18V
IN
1000
900
800
INPUT CURRENT (mA)
700
600
500
400
300
200
100
0
100
200
300
400
500
OUTPUT CURRENT (mA)
600
8045 G16
Input Current vs Output Current,
12V
OUT
SEPIC
3.3V
IN
5V
IN
12V
IN
18V
IN
900
800
700
INPUT CURRENT (mA)
600
500
400
300
200
100
Input Current vs Output Current,
15V
OUT
SEPIC
5V
IN
12V
IN
18V
IN
0
0
100
200
300
400
OUTPUT CURRENT (mA)
500
8045 G17
0
0
100
200
300
400
OUTPUT CURRENT (mA)
500
8045 G18
8045fb
For more information
www.linear.com/LTM8045
5
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