LTM8056
58V
IN
, 48V
OUT
Buck-Boost
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
8056
is a 58V
IN
, buck-boost µModule
®
(micromodule) regulator. Included in the package 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 LTM8056 operates over an input volt-
age range of 5V to 58V, and can regulate output voltages
between 1.2V and 48V. The SYNC input and CLKOUT
output allow easy synchronization.
The LTM8056 is housed in a compact overmolded ball
grid array (BGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8056 is
available with SnPB or RoHS compliant terminal finish.
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
36
40
40
8.5
LTM8056
58
60
60
5.5
Complete Buck-Boost Switch Mode Power Supply
Wide Input Voltage Range: 5V to 58V
12V/1.7A Output from 6V
IN
12V/3.4A Output from 12V
IN
12V/5.4A Output from 24V
IN
Up to 96% 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 48V
Selectable Switching Frequency: 100kHz to 800kHz
Synchronization from 200kHz to 700kHz
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
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
15 × 15mm × 4.92mm BGA
Pin and Function Compatible
TYPICAL APPLICATION
24V
OUT
from 7V
IN
to 58V
IN
Buck-Boost Regulator
EFFICIENCY AT MAX OUTPUT CURRENT (%)
V
IN
7V TO 58V
V
IN
SV
IN
I
IN
2.2µF
100V
×3
RUN
CTL
SS
SYNC
COMP
RT LL
LTM8056
V
OUT
I
OUT
100k
CLKOUT
I
INMON
I
OUTMON
FB
22µF
25V
5.23k
8056 TA01a
Max Output Current and Efficiency vs V
IN
95
7
6
MAX OUTPUT CURRENT (A)
5
93
4
3
2
91
EFFICIENCY
MAX OUTPUT CURRENT
0
10
20
30
V
IN
(V)
40
50
8056 TA01b
V
OUT
24V
94
33µF
35V
92
43.2k
MODE
GND
1
0
90
f
SW
= 525kHz
8056fa
For more information
www.linear.com/LTM8056
1
LTM8056
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 .....................60V
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
= 16.4°C/W,
θ
JCbottom
= 5.35°C/W,
θ
JCtop
= 15.3°C/W,
θ
JB
= 5.9°C/W,
WEIGHT = 2.8g,
θ
VALUES DETERMINED PER JEDEC JESD51-9, 51-12
ORDER INFORMATION
PART NUMBER
LTM8056EY#PBF
LTM8056IY#PBF
LTM8056IY
LTM8056MPY#PBF
LTM8056MPY
BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SAC305 (RoHS)
SnPb (63/37)
http://www.linear.com/product/LTM8056#orderinfo
PART MARKING*
DEVICE
LTM8056Y
LTM8056Y
LTM8056Y
LTM8056Y
LTM8056Y
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
2
8056fa
For more information
www.linear.com/LTM8056
LTM8056
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
I
OUT
= 0.1A, R
FB
= 100k/2.55k
V
IN
= 6V, V
OUT
= 12V
V
IN
= 48V, V
OUT
= 12V
RUN = 0.3V (Disabled)
No Load, MODE = 0.3V (DCM)
No Load, MODE = 1.5V (FCM)
5V < V
IN
< 58V, I
OUT
= 1A
V
IN
= 12V, 0.1A < I
OUT
< 3.5A
V
IN
= 24V, I
OUT
= 3A
R
T
= 453k
R
T
= 24.9k
MIN
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TYP
1.2
48
1.7
4
0.1
8
45
0.5
0.5
25
100
800
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
LTM8056 Stops Switching
LTM8056 Starts Switching
LTM8056 Disabled
RUN = 1V
RUN = 1.6V
l
1.188
1.176
1.15
25
2
3
90
1.212
1.220
1.25
0.3
5
100
56
20
61.5
63
1.04
1.26
22
35
l
44
54.5
53
0.96
1.14
V
CTL
= Open
l
LTM8056 in Input Current Limit
LTM8056 in Output Current Limit
V
CTL
= 0V
V
SS
= 0V
10k to GND
10k to 5V
4
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 LTM8056E 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
LTM8056I is guaranteed to meet specifications over the full –40°C
to 125°C internal operating temperature range. The LTM8056MP 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 LTM8056 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.
8056fa
For more information
www.linear.com/LTM8056
3
LTM8056
TYPICAL PERFORMANCE CHARACTERISTICS
100
T
A
= 25°C, unless otherwise noted.
Efficiency vs Output Current
(8V
OUT
)
100
Efficiency vs Output Current
(3.3V
OUT
)
100
Efficiency vs Output Current
(5V
OUT
)
EFFICIENCY (%)
EFFICIENCY (%)
60
5V
IN
12V
IN
24V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G01
60
5V
IN
12V
IN
22V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G02
EFFICIENCY (%)
80
80
80
60
5V
IN
12V
IN
24V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G03
40
40
40
Efficiency vs Output Current
(12V
OUT
)
100
100
Efficiency vs Output Current
(18V
OUT
)
100
Efficiency vs Output Current
(24V
OUT
)
95
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
90
90
90
85
7V
IN
12V
IN
24V
IN
36V
IN
48V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G06
80
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G04
80
6V
IN
12V
IN
24V
IN
48V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G05
80
70
70
75
100
Efficiency vs Output Current
(36V
OUT
)
100
Efficiency vs Output Current
(48V
OUT
)
4
Input Current vs Output Current
(3.3V
OUT
)
5V
IN
12V
IN
24V
IN
EFFICIENCY (%)
EFFICIENCY (%)
95
95
INPUT CURRENT (A)
13V
IN
24V
IN
36V
IN
48V
IN
0
1
2
3
OUTPUT CURRENT (A)
4
8056 G08
3
2
90
85
9V
IN
12V
IN
24V
IN
36V
IN
48V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G07
90
1
85
0
0
2
4
OUTPUT CURRENT (A)
6
8056 G09
4
8056fa
For more information
www.linear.com/LTM8056
LTM8056
TYPICAL PERFORMANCE CHARACTERISTICS
4
T
A
= 25°C, unless otherwise noted.
Input Current vs Output Current
(12V
OUT
)
Input Current vs Output Current
(5V
OUT
)
5V
IN
12V
IN
22V
IN
INPUT CURRENT (A)
5
Input Current vs Output Current
(8V
OUT
)
5V
IN
12V
IN
24V
IN
INPUT CURRENT (A)
4
INPUT CURRENT (A)
3
4
3
3
2
2
2
1
1
1
0
0
2
4
OUTPUT CURRENT (A)
6
8056 G10
0
0
2
4
OUTPUT CURRENT (A)
6
8056 G11
0
5V
IN
12V
IN
24V
IN
36V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G12
Input Current vs Output Current
(18V
OUT
)
5
5
Input Current vs Output Current
(24V
OUT
)
5
Input Current vs Output Current
(36V
OUT
)
4
INPUT CURRENT (A)
INPUT CURRENT (A)
3
4
3
INPUT CURRENT (A)
4
3
2
9V
IN
12V
IN
24V
IN
36V
IN
48V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G15
2
6V
IN
12V
IN
24V
IN
48V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G13
2
7V
IN
12V
IN
24V
IN
36V
IN
48V
IN
0
2
4
OUTPUT CURRENT (A)
6
8056 G14
1
0
1
0
1
0
Input Current vs Output Current
(48V
OUT
)
4
6
Maximum Output Current vs V
IN
6
5
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Maximum Output Current vs V
IN
INPUT CURRENT (A)
3
5
4
3
2
1
0
12V
OUT
18V
OUT
24V
OUT
0
10
2
4
1
0
13V
IN
24V
IN
36V
IN
48V
IN
0
0.5
1.0 1.5 2.0 2.5
OUTPUT CURRENT (A)
3.0
3.5
3
2
3.3V
OUT
5V
OUT
8V
OUT
0
10
V
IN
(V)
20
30
8056 G17
8056 G16
20
30
V
IN
(V)
40
50
8056 G18
8056fa
For more information
www.linear.com/LTM8056
5
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