LTM8055/LTM8055-1
36V
IN
, 8.5A Buck-Boost
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
8055/LTM8055-1
is a 36V
IN
, buck-boost
µModule
®
(micromodule) regulator. Included in the pack-
age are the switching controller, power switches, inductor
and support components. A resistor to set the switching
frequency, a resistor divider to set the output voltage,
and input and output capacitors are all that are needed
to complete the design. Other features such as input and
output average current regulation may be implemented
with just a few components. The LTM8055/LTM8055-1
operates over an input voltage range of 5V to 36V, and
can regulate output voltages between 1.2V and 36V. The
SYNC input and CLKOUT output allow easy synchronization.
The LTM8055/LTM8055-1 is housed in a compact over-
molded ball grid array (BGA) package suitable for auto-
mated assembly by standard surface mount equipment.
The LTM8055/LTM8055-1 is RoHS compliant.
Buck-Boost Selection Table
LTM8054
V
IN
(Operation)
V
IN
Abs Max
V
OUT
Abs Max
I
OUT
(Peak)
24V
IN
, 12V
OUT
Package
36
40
40
5.4
15 × 11.25mm ×
3.42mm BGA
LTM8055/LTM8055-1
36
40
40
8.5
LTM8056
58
60
60
5.5
Complete Buck-Boost Switch Mode Power Supply
V
OUT
Equal, Greater, Less Than V
IN
Wide Input Voltage Range: 5V to 36V
12V/3A Output from 6V
IN
12V/6A Output from 12V
IN
12V/8.5A Output from 24V
IN
Up to 97.5% Efficient
Adjustable Input and Output Average Current Limits
Input and Output Current Monitors
Parallelable for Increased Output Current
Wide Output Voltage Range: 1.2V to 36V
Selectable Switching Frequency: 100kHz to 800kHz
Synchronization from 200kHz to 700kHz
External Compensation (LTM8055-1)
15mm
×
15mm
×
4.92mm BGA Package
APPLICATIONS
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High Power Battery-Operated Devices
Industrial Control
Solar Powered Voltage Regulator
Solar Powered Battery Charging
All registered trademarks and trademarks are the property of their respective owners.
15 × 15mm × 4.92mm BGA
Pin and Function Compatible
TYPICAL APPLICATION
12V
OUT
from 5V
IN
to 36V
IN
Buck-Boost Regulator
V
IN
5V TO 36V
V
IN
SV
IN
I
IN
4.7µF
50V
×2
LTM8055/
LTM8055-1
V
OUT
I
OUT
100k
CLKOUT
I
INMON
I
OUTMON
FB
22µF
25V
11k
8055 TA01a
Maximum Output Current and Efficiency vs V
IN
10
EFFICIENCY
OUTPUT CURRENT (A)
V
OUT
12V
8
6
OUTPUT
CURRENT
98
96
94
EFFICIENCY (%)
92
90
88
2
86
0
10
20
V
IN
(V)
30
40
8055 TA01b
36.5k
RUN
CTL
SS
SYNC
COMP
RT LL MODE
68µF
4
GND
0
84
f
SW
= 600kHz
Rev C
Document Feedback
For more information
www.analog.com
1
LTM8055/LTM8055-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
SV
IN
11
10
BANK 1
GND
9
8
7
6
5
BANK 2
V
OUT
4
3
2
1
A
B
F G H J
K
L
LL
RT FB SS
CLKOUT
MODE SYNC
CTL
COMP
BGA PACKAGE
121-LEAD (15mm × 15mm × 4.92mm)
C
D
IOUT
E
RUN
I
INMON
I
OUTMON
GND
I
IN
BANK 3
V
IN
V
IN
, SV
IN
, V
OUT
, RUN, I
IN
, I
OUT
Voltage .....................40V
FB, SYNC, CTL, MODE Voltage ...................................6V
I
INMON
, I
OUTMON
Voltage .............................................6V
LL Voltage .................................................................15V
Maximum Junction Temperature (Notes 2, 3) ....... 125°C
Storage Temperature.............................. –55°C to 125°C
Peak Solder Reflow Body Temperature ................. 245°C
T
JMAX
= 125°C,
θ
JA
= 20.5°C/W,
θ
JCbottom
= 11.0°C/W,
θ
JCtop
= 21.2°C/W,
θ
JB
= 10.5°C/W,
WEIGHT = 2.8g,
θ
VALUES DETERMINED PER JEDEC JESD51-9, 51-12
ORDER INFORMATION
PART NUMBER
LTM8055EY#PBF
LTM8055IY#PBF
LTM8055IY
LTM8055MPY#PBF
LTM8055MPY
LTM8055EY-1#PBF
LTM8055IY-1#PBF
TERMINAL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb(63/37)
SAC305 (RoHS)
SnPb(63/37)
SAC305 (RoHS)
SAC305 (RoHS)
PART MARKING*
DEVICE
LTM8055Y
LTM8055Y
LTM8055Y
LTM8055Y
LTM8055Y
LTM8055Y-1
LTM8055Y-1
FINISH CODE
e1
e1
e0
e1
e0
e1
e1
PACKAGE
TYPE
BGA
BGA
BGA
BGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
3
3
TEMPERATURE RANGE
(SEE 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
–40°C to 125°C
–40°C to 125°C
• Device temperature grade is indicated by a label on the shipping
container.
• Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
BGA Package and Tray Drawings
This product is not recommended for second side reflow.
This product is moisture sensitive. For more information, go to
Recommended BGA PCB Assembly and Manufacturing Procedures.
Rev C
2
For more information
www.analog.com
LTM8055/LTM8055-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. RUN = 1.5V unless otherwise noted. (Note 2)
PARAMETER
Minimum Input Voltage
Output DC Voltage
Output DC Current
Quiescent Current Into V
IN
(Tied to SV
IN
)
Output Voltage Line Regulation
Output Voltage Load Regulation
Output RMS Voltage Ripple
Switching Frequency
Voltage at FB Pin
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
IN
= SV
IN
FB = V
OUT
Through 100k
R
FB
= 100k/3.40k
V
IN
= 6V, V
OUT
= 12V
V
IN
= 24V, V
OUT
= 12V
RUN = 0.3V (Disabled)
No Load, MODE = 0.3V (DCM)
No Load, MODE = 1.5V (FCM)
5V < V
IN
< 36V, I
OUT
= 1A
V
IN
= 12V, 0.1A < I
OUT
< 6A
V
IN
= 12V, I
OUT
= 3A
R
T
= 453k
R
T
= 24.9k
MIN
l
TYP
1.2
36
3
8.5
0.1
8
45
0.5
0.5
25
100
800
1.2
MAX
5.0
1
30
100
RUN Falling Threshold
RUN Hysteresis
RUN Low Threshold
RUN Pin Current
I
IN
Bias Current
Input Current Sense Threshold (I
IN
-V
IN
)
I
OUT
Bias Current
Output Current Sense Threshold (V
OUT
-I
OUT
)
I
INMON
Voltage
I
OUTMON
Voltage
CTL Input Bias Current
SS Pin Current
CLKOUT Output High
CLKOUT Output Low
SYNC Input Low Threshold
SYNC Input High Threshold
SYNC Bias Current
MODE Input Low Threshold
MODE Input High Threshold
LTM8055/LTM8055-1 Stops Switching
LTM8055/LTM8055-1 Starts Switching
LTM8055/LTM8055-1 Disabled
RUN = 1V
RUN = 1.6V
l
1.188
1.176
1.15
1.212
1.220
1.25
0.3
5
100
56
25
2
3
90
l
44
20
54.5
53
0.96
1.14
22
35
4
V
CTL
= Open
l
LTM8055/LTM8055-1 in Input Current Limit
LTM8055/LTM8055-1 in Output Current Limit
V
CTL
= 0V
V
SS
= 0V
10k to GND
10k to 5V
61.5
63
1.04
1.26
0.7
0.3
1.5
11
0.3
1.5
SYNC = 1V
UNITS
V
V
V
A
A
µA
mA
mA
%
%
mV
kHz
kHz
V
V
V
mV
V
µA
nA
µA
mV
µA
mV
mV
V
V
µA
µA
V
V
V
V
µA
V
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 LTM8055E/LTM8055E-1 is guaranteed to meet performance
specifications from 0°C to 125°C internal. 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 LTM8055I/LTM8055I-1 is guaranteed to meet specifications over
the full –40°C to 125°C internal operating temperature range. The
LTM8055MP/LTM8055MP-1 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:
The LTM8055/LTM8055-1 contains overtemperature protection
that is intended to protect the device during momentary overload
conditions. The internal temperature exceeds the maximum operating
junction temperature when the overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Rev C
For more information
www.analog.com
3
LTM8055/LTM8055-1
TYPICAL PERFORMANCE CHARACTERISTICS
100
T
A
= 25°C, unless otherwise noted.
Efficiency vs Output Current
(8V
OUT
)
Efficiency vs Output Current
(3.3V
OUT
)
100
Efficiency vs Output Current
(5V
OUT
)
100
80
EFFICIENCY (%)
EFFICIENCY (%)
60
80
EFFICIENCY (%)
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G02
80
60
60
40
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G01
20
40
40
0
20
20
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G03
100
Efficiency vs Output Current
(12V
OUT
)
100
Efficiency vs Output Current
(18V
OUT
)
100
Efficiency vs Output Current
(24V
OUT
)
80
EFFICIENCY (%)
80
EFFICIENCY (%)
EFFICIENCY (%)
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
6
OUTPUT CURRENT (A)
8
8055 G05
80
60
60
60
40
20
5V
IN
12V
IN
24V
IN
36V
IN
0
3
6
OUTPUT CURRENT (A)
9
8055 G04
40
40
20
20
5V
IN
12V
IN
24V
IN
36V
IN
0
1
2
3
4
5
OUTPUT CURRENT (A)
6
7
8055 G06
100
90
Efficiency vs Output Current
(36V
OUT
)
7
6
INPUT CURRENT (A)
5
4
3
2
1
5
8055 G07
Input Current vs Output Current
(3.3V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
INPUT CURRENT (A)
10
Input Current vs Output Current
(5V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
8
6
EFFICIENCY (%)
80
70
60
50
40
5V
IN
12V
IN
24V
IN
36V
IN
0
1
2
3
4
OUTPUT CURRENT (A)
4
2
0
0
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G08
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G09
Rev C
4
For more information
www.analog.com
LTM8055/LTM8055-1
TYPICAL PERFORMANCE CHARACTERISTICS
10
T
A
= 25°C, unless otherwise noted.
Input Current vs Output Current
(18V
OUT
)
Input Current vs Output Current
(8V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
10
Input Current vs Output Current
(12V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
10
8
INPUT CURRENT (A)
6
8
INPUT CURRENT (A)
6
8
INPUT CURRENT (A)
6
4
4
4
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
6
OUTPUT CURRENT (A)
8
8055 G12
2
0
2
0
2
0
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G10
0
3
6
OUTPUT CURRENT (A)
9
8055 G11
10
Input Current vs Output Current
(24V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
INPUT CURRENT (A)
9
8
7
6
5
4
3
2
1
Input Current vs Output Current
(36V
OUT
)
10
Maximum Output Current vs V
IN
8
INPUT CURRENT (A)
6
OUTPUT CURRENT (A)
8
4
6
3.3V
OUT
5V
OUT
8V
OUT
0
10
20
V
IN
(V)
30
40
8055 G15
2
0
0
2
4
OUTPUT CURRENT (A)
6
8055 G13
0
5V
IN
12V
IN
24V
IN
36V
IN
0
1
2
3
4
OUTPUT CURRENT (A)
5
8055 G14
4
Maximum Output Current vs V
IN
10
100
Temperature Rise vs Output
Current (3.3V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
100
Temperature Rise vs Output
Current (5V
OUT
)
5V
IN
12V
IN
24V
IN
36V
IN
TEMPERATURE RISE (°C)
6
60
TEMPERATURE RISE (°C)
10
8055 G17
8
OUTPUT CURRENT (A)
80
80
60
4
2
12V
OUT
18V
OUT
24V
OUT
36V
OUT
0
10
20
V
IN
(V)
30
40
8055 G16
40
20
40
20
0
0
0
2
4
6
8
OUTPUT CURRENT (A)
0
0
2
4
6
8
OUTPUT CURRENT (A)
10
8055 G18
Rev C
For more information
www.analog.com
5
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