LTM8026
36V
IN
, 5A CVCC Step-Down
µModule Regulator
FeaTures
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DescripTion
The
LTM
®
8026
is a 36V
IN
, 5A constant-voltage, constant-
current (CVCC) step-down µModule
®
regulator. Included in
the package are the switching controller, power switches,
inductor and support components. Operating over an
input voltage range of 6V to 36V, the LTM8026 supports
an output voltage range of 1.2V to 24V. CVCC operation
allows the LTM8026 to accurately regulate its output
current up to 5A over the entire output range. The output
current can be set by a control voltage, a single resistor or
a thermistor. Only resistors to set the output voltage and
frequency and the bulk input and output filter capacitors
are needed to finish the design.
The LTM8026 is packaged in a thermally-enhanced,
compact (11.25mm
×
15mm) overmolded land grid ar-
ray (LGA) and ball grid array (BGA) packages suitable for
automated assembly by standard surface mount equip-
ment. The LTM8026 is available in SnPb (BGA) or RoHS
compliant terminal finish.
L,
LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7199560, 7321203 and others pending.
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Complete Step-Down Switch Mode Power Supply
Constant-Voltage Constant-Current Operation
Selectable Output Current Up to 5A
Parallelable for Increased Output Current, Even
from Different Voltage Sources
Wide Input Voltage Range: 6V to 36V
1.2V to 24V Output Voltage
Selectable Switching Frequency: 100kHz to 1MHz
SnPb or RoHS Compliant Finish
Programmable Soft-Start
(11.25mm
×
15mm
×
2.82mm) LGA and (11.25mm
×
15mm
×
3.42mm BGA Packages
applicaTions
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SuperCap Charging
General Purpose Industrial
Extreme Short-Circuit Protection or Accurate Output
Current Limit
µController-Based Battery Charging
High Power LED Drive
Multiple Input, Single Output Voltage Conversion
Typical applicaTion
Typical Application
V
IN
6V TO 36V
LTM8026
V
IN
V
OUT
RUN
SS
SYNC
COMP
RT
90.9k
V
REF
CTL_I
CTL_T
GND ADJ
9.09k
100µF
V
OUT
2.5V
5A
3.0
2.5
OUTPUT VOLTAGE (V)
2.0
1.5
1.0
0.5
8026 TA01a
V
OUT
vs I
OUT
, 12V
IN
10µF
510k
+
330µF
0
0
1
2
3
4
5
OUTPUT CURRENT (A)
6
8026 TA01b
8026fc
For more information
www.linear.com/LTM8026
1
LTM8026
absoluTe MaxiMuM raTings
(Note 1)
V
IN
............................................................................40V
ADJ, RT, COMP, CTL_I, CTL_T, V
REF
...........................3V
V
OUT
..........................................................................25V
RUN, SYNC, SS ...........................................................6V
Current Into RUN Pin ............................................100µA
Internal Operating Temperature Range .. –40°C to 125°C
Peak Solder Reflow Body Temperature ................. 245°C
Storage Temperature.............................. –55°C to 125°C
pin conFiguraTion
TOP VIEW
COMP
CLT_T
CLT_T
CLT_I
V
REF
ADJ
SS
RT
TOP VIEW
COMP
CLT_I
V
REF
ADJ
SS
RT
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
J
BANK 1
V
OUT
BANK 3
V
IN
K
L
BANK 2 GND
SYNC
RUN
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
J
BANK 1
V
OUT
BANK 3
V
IN
K
L
BANK 2 GND
SYNC
RUN
LGA PACKAGE
81-LEAD (15mm
×
11.25mm
×
2.82mm)
T
JMAX
= 125°C,
θ
JA
= 18.6°C/W,
θ
JC(bottom)
= 5.4°C/W,
θ
JB
= 5.6°C/W,
θ
JC(top)
= 10.8°C/W
WEIGHT = 1.4g,
θ
VALUES DERIVED FROM A 4-LAYER 7.62cm
×
7.62cm
BGA PACKAGE
81-LEAD (15mm
×
11.25mm
×
3.42mm)
T
JMAX
= 125°C,
θ
JA
= 18.6°C/W,
θ
JC(bottom)
= 5.4°C/W,
θ
JB
= 5.6°C/W,
θ
JC(top)
= 10.8°C/W
WEIGHT = 1.4g,
θ
VALUES DERIVED FROM A 4-LAYER 7.62cm
×
7.62cm
orDer inForMaTion
PART NUMBER
LTM8026EV#PBF
LTM8026IV#PBF
LTM8026MPV#PBF
LTM8026EY#PBF
LTM8026IY#PBF
LTM8026IY
LTM8026MPY#PBF
LTM8026MPY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SAC305 (RoHS)
SnPb (63/37)
PART MARKING*
DEVICE
LTM8026V
LTM8026V
LTM8026MPV
LTM8026Y
LTM8026Y
LTM8026Y
LTM8026Y
LTM8026Y
FINISH CODE
e4
e4
e4
e1
e1
e0
e1
e0
PACKAGE
TYPE
LGA
LGA
LGA
BGA
BGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
3
3
3
TEMPERATURE RANGE
(Note 2)
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–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
8026fc
2
For more information
www.linear.com/LTM8026
LTM8026
elecTrical characTerisTics
PARAMETER
Minimum Input Voltage
Output DC Voltage
Output DC Current
Quiescent Current Into V
IN
Line Regulation
Load Regulation
Output RMS Voltage Ripple
Switching Frequency
Voltage at ADJ Pin
Current Out of ADJ Pin
RUN Pin Current
RUN Threshold Voltage (Falling)
RUN Input Hysteresis
CTL_I Control Range
CTL_I Pin Current
CTL_I Current Limit Accuracy
CTL_T Control Range
CTL_T Pin Current
CTL_T Current Limit Accuracy
V
REF
Voltage
SS Pin Current
SYNC Input Low Threshold
SYNC Input High Threshold
SYNC Bias Current
CTL_T = 1.5V
CTL_T = 0.75V
0.5mA Load
(Note 4)
f
SYNC
= 400kHz
f
SYNC
= 400kHz
SYNC = 0V
1.2
1
5.1
2.24
1.89
–11
0.6
5.6
2.8
CTL_I = 1.5V
CTL_I = 0.75V
5.1
2.24
0
5.6
2.8
0
ADJ = 0V, V
OUT
= 1V
RUN = 1.45V
1.47
I
OUT
= 1A, R
ADJ
Open
I
OUT
= 1A, R
ADJ
= 499Ω
6V < V
IN
< 36V, V
OUT
= 3.3V
RUN = 0V
No Load
6V < V
IN
< 36V, I
OUT
= 1A
V
IN
= 12V, 0A < I
OUT
< 5A
V
IN
= 12V, I
OUT
= 4.5A
R
T
= 40.2k
R
T
= 453k
l
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C. RUN = 3V, unless otherwise noted. (Note 3)
CONDITIONS
l
MIN
TYP
1.2
24
MAX
6
UNITS
V
V
V
0
0.1
2
0.1
0.7
10
1000
100
1.16
1.19
100
5.5
1.55
130
5
3
4
A
µA
mA
%
%
mV
kHz
kHz
1.22
V
µA
µA
1.63
1.5
1.5
6.1
3.36
1.5
1.5
6.1
3.36
2.04
V
mV
V
µA
A
A
V
µA
A
A
V
µA
V
V
µA
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:
This µModule regulator 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.
Note 3:
The LTM8026E is guaranteed to meet performance specifications
from 0°C to 125°C internal operating temperature. 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 LTM8026I is guaranteed to meet specifications over the full –40°C
to 125°C internal operating temperature range. The LTM8026MP 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:
Current flows out of pin.
8026fc
For more information
www.linear.com/LTM8026
3
LTM8026
T
A
= 25°C, unless otherwise noted. Configured per Table 1, where applicable.
1.2V
OUT
Efficiency
vs Output Current
90
85
80
EFFICIENCY (%)
EFFICIENCY (%)
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
6V
IN
12V
IN
24V
IN
36V
IN
5
8026 G01
Typical perForMance characTerisTics
1.5V
OUT
Efficiency
vs Output Current
90
85
80
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
6V
IN
12V
IN
24V
IN
36V
IN
5
8026 G02
1.8V
OUT
Efficiency
vs Output Current
90
85
80
EFFICIENCY (%)
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
6V
IN
12V
IN
24V
IN
36V
IN
5
8026 G03
2.5V
OUT
Efficiency
vs Output Current
95
90
85
EFFICIENCY (%)
EFFICIENCY (%)
80
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
6V
IN
12V
IN
24V
IN
36V
IN
5
8026 G04
3.3V
OUT
Efficiency
vs Output Current
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
6V
IN
12V
IN
24V
IN
36V
IN
5
8026 G05
5V
OUT
Efficiency
vs Output Current
95
90
85
80
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
12V
IN
24V
IN
36V
IN
5
8026 G06
8V
OUT
Efficiency
vs Output Current
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
12V
IN
24V
IN
36V
IN
5
8026 G07
12V
OUT
Efficiency
vs Output Current
95
90
85
80
75
70
65
60
0
1
4
3
OUTPUT CURRENT (A)
2
24V
IN
36V
IN
5
8026 G08
18V
OUT
Efficiency
vs Output Current
100
95
90
EFFICIENCY (%)
85
80
75
70
65
0
1
4
3
OUTPUT CURRENT (A)
2
24V
IN
36V
IN
5
8026 G09
4
8026fc
For more information
www.linear.com/LTM8026
LTM8026
Typical perForMance characTerisTics
T
A
= 25°C, unless otherwise noted. Configured per Table 1, where applicable.
24V
OUT
Efficiency
vs Output Current
100
95
EFFICIENCY (%)
EFFICIENCY (%)
90
85
80
75
70
90
85
80
75
70
65
60
28V
IN
36V
IN
0
1
4
3
OUTPUT CURRENT (A)
2
5
8026 G10
T
A
= 25°C, unless otherwise noted.
–5V
OUT
Efficiency
vs Output Current
90
85
80
EFFICIENCY (%)
12V
IN
24V
IN
33V
IN
75
70
65
60
55
5
8026 G11
–3.3V
OUT
Efficiency
vs Output Current
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
50
12V
IN
24V
IN
31V
IN
0
1
4
3
OUTPUT CURRENT (A)
2
5
8026 G12
–8V
OUT
Efficiency
vs Output Current
90
85
80
EFFICIENCY (%)
EFFICIENCY (%)
75
70
65
60
55
50
0
1
4
3
OUTPUT CURRENT (A)
2
12V
IN
24V
IN
28V
IN
5
8026 G13
–12V
OUT
Efficiency
vs Output Current
90
85
80
75
70
65
60
INPUT CURRENT (A)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
12V
IN
24V
IN
0
0.5
1
1.5
2
2.5
3
3.5
8026 G14
Input Current vs Output Current
1.2V
OUT
6V
IN
12V
IN
24V
IN
36V
IN
0.2
0
0
1
4
3
OUTPUT CURRENT (A)
2
5
8026 G15
OUTPUT CURRENT (A)
Input Current vs Output Current
1.5V
OUT
1.8
1.6
1.4
INPUT CURRENT (A)
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
4
3
OUTPUT CURRENT (A)
2
5
8026 G16
Input Current vs Output Current
1.8V
OUT
2.0
1.8
1.6
INPUT CURRENT (A)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
4
3
OUTPUT CURRENT (A)
2
5
8026 G17
Input Current vs Output Current
2.5V
OUT
3.0
2.5
INPUT CURRENT (A)
2.0
1.5
1.0
0.5
0
6V
IN
12V
IN
24V
IN
36V
IN
6V
IN
12V
IN
24V
IN
36V
IN
6V
IN
12V
IN
24V
IN
36V
IN
0
1
2
3
4
OUTPUT CURRENT (A)
5
8026 G18
8026fc
For more information
www.linear.com/LTM8026
5
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