LTM8025
36V, 3A Step-Down
µModule Converter
FEATURES
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DESCRIPTION
The LTM
®
8025 is a 36V
IN
, 3A step down μModule
®
con-
verter. Included in the package are the switching controller,
power switches, inductor and all support components.
Operating over an input voltage range of 3.6V to 36V, the
LTM8025 supports an output voltage range of 0.8V to 24V
and a switching frequency range of 200kHz to 2.4MHz,
each set by a single resistor. Only the bulk input and output
filter capacitors are needed to finish the design.
The low profile package (4.32mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation.
The LTM8025 is packaged in a thermally enhanced, compact
(15mm
×
9mm) and low profile (4.32mm) over-molded
land grid array (LGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8025 is RoHS compliant.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Complete Step-Down Switch Mode Power Supply
Wide Input Voltage Range: 3.6V to 36V
Up to 3A Output Current
Parallelable for Increased Output Current
0.8V to 24V Output Voltage
Selectable Switching Frequency: 200kHz to 2.4MHz
Current Mode Control
(e4) RoHS Compliant Package with Gold Pad Finish
Programmable Soft-Start
Tiny, Low Profile (15mm
×
9mm
×
4.32mm) Surface
Mount LGA Package
APPLICATIONS
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Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
TYPICAL APPLICATION
Efficiency
100
V
IN
*
22V TO 36V
4.7μF
V
IN
RUN/SS
LTM8025
SHARE
RT
47.5k
SYNC
GND
V
OUT
AUX
EFFICIENCY(%)
BIAS
PGOOD
ADJ
34.8k
50
*RUNNING VOLTAGE RANGE. PLEASE REFER TO
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS
40
0
500
1000 1500 2000 2500
OUTPUT CURRENT (mA)
3000
22μF
80
70
60
V
OUT
12V AT 3A
90
V
IN
= 24V
8025 TA01a
8025 TA01b
8025f
1
LTM8025
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
1
A
B
BANK 1
C
D
E
BANK 2
F
G
H
J
BANK 3
K
L
V
IN
RUN/SS SYNC
AUX
BIAS
RT
SHARE
PGOOD
ADJ
2
3
4
5
6
GND
7
V
OUT
V
IN
, RUN/SS Voltage.................................................36V
ADJ, RT, SHARE Voltage .............................................6V
V
OUT
, AUX .................................................................25V
PGOOD, SYNC...........................................................30V
BIAS ..........................................................................25V
V
IN
+ BIAS.................................................................56V
Maximum Junction Temperature (Note 2) ............ 125°C
Solder Temperature............................................... 245°C
LGA PACKAGE
70-PIN (15mm 9mm 4.32mm)
T
JMAX
= 125°C,
θ
JA
= 24.4°C/W,
θ
JC(BOTTOM)
= 11.5°C/W,
θ
JC(TOP)
= 42.7°C/W,
θ
JB
= 18.7°C/W
θ
VALUES DETERMINED PER JESD51-9, MAX OUTPUT POWER
WEIGHT = 1.8 GRAMS
ORDER INFORMATION
LEAD FREE FINISH
LTM8025EV#PBF
LTM8025IV#PBF
LTM8025MPV#PBF
TRAY
LTM8025EV#PBF
LTM8025IV#PBF
LTM8025MPV#PBF
PART MARKING
8025V
8025V
8025MPV
PACKAGE DESCRIPTION
70-Lead (15mm
×
9mm
×
4.32mm) LGA
70-Lead (15mm
×
9mm
×
4.32mm) LGA
70-Lead (15mm
×
9mm
×
4.32mm) LGA
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Output DC Voltage
Output DC Current
Quiescent Current into V
IN
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, RUN/SS = 12V, BIAS = 3V unless otherwise noted. (Note 2)
CONDITIONS
l
MIN
TYP
0.8
24
MAX
3.6
UNITS
V
V
V
0 < I
OUT
≤ 3A; R
ADJ
Open
0 < I
OUT
≤ 3A; R
ADJ
= 16.9k; V
IN
= 32V
V
OUT
= 3.3V
RUN/SS = 0V
Not Switching
BIAS = 0V, Not Switching
RUN/SS = 0V
Not Switching
BIAS = 0V, Not Switching
5.5V < V
IN
< 36V, I
OUT
= 1A
0A < I
OUT
< 3A
0
3
0.01
25
85
0.01
65
0
0.3
0.4
1
60
150
0.5
120
5
A
μA
μA
μA
μA
μA
μA
%
%
8025f
Quiescent Current into BIAS
Line Regulation
Load Regulation
2
LTM8025
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage Ripple (RMS)
Switching Frequency
Voltage (at ADJ Pin)
Current Out of ADJ Pin
Minimum BIAS Voltage for Proper Operation
RUN/SS Pin Current
RUN Input High Voltage
RUN Input Low Voltage
PGOOD Threshold (at ADJ Pin)
PGOOD Leakage Current
PGOOD Sink Current
SYNC Input Low Threshold
SYNC Input High Threshold
SYNC Bias Current
V
OUT
Rising
PGOOD = 30V
PGOOD = 0.4V
f
SYNC
= 550kHz
f
SYNC
= 550kHz
SYNC = 0V
0.7
0.1
200
710
0.1
700
0.5
1
RUN/SS = 2.5V
2.5
0.2
ADJ = 0V, V
OUT
= 1V
R
T
= 45.3k
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, RUN/SS = 12V, BIAS = 3V unless otherwise noted. (Note 2)
CONDITIONS
0A < I
OUT
< 3A
775
770
MIN
TYP
10
775
790
2
2
5
2.8
10
805
810
MAX
UNITS
mV
kHz
mV
mV
μA
V
μA
V
V
mV
μA
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:
The LTM8025E 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
LTM8025I is guaranteed to meet specifications over the full –40°C
to 125°C internal operating temperature range. The LTM8025MP 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.
8025f
3
LTM8025
TYPICAL PERFORMANCE CHARACTERISTICS
2.5V
OUT
Efficiency
100
90
80
70
60
50
40
0
500
5V
IN
12V
IN
24V
IN
32V
IN
1000 1500 2000 2500
LOAD CURRENT (mA)
3000
100
90
80
70
60
50
40
0
500
5.5V
IN
12V
IN
24V
IN
32V
IN
1000 1500 2000 2500
LOAD CURRENT (mA)
3000
T
A
= 25°C, unless otherwise noted.
3.3V
OUT
Efficiency
100
90
80
70
60
50
40
5V
OUT
Efficiency
EFFICIENCY(%)
EFFICIENCY(%)
EFFICIENCY(%)
12V
IN
24V
IN
32V
IN
0
500
1000 1500 2000 2500
LOAD CURRENT (mA)
3000
8025 G01
8025 G02
8025 G03
8V
OUT
Efficiency
100
90
80
70
60
50
40
0
500
12V
IN
24V
IN
32V
IN
1000 1500 2000 2500
LOAD CURRENT (mA)
3000
100
90
80
70
60
50
40
12V
OUT
Efficiency
100
90
80
70
60
50
40
18V
OUT
Efficiency
EFFICIENCY(%)
EFFICIENCY(%)
16V
IN
24V
IN
32V
IN
0
500
1000 1500 2000 2500
LOAD CURRENT (mA)
3000
EFFICIENCY(%)
24V
IN
32V
IN
0
500
1000 1500 2000 2500
LOAD CURRENT (mA)
3000
8025 G04
8025 G05
8025 G06
Bias Current vs Load Current
2.5V
OUT
25
12V
IN
24V
IN
30
25
BIAS CURRENT (mA)
20
15
10
5
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G07
Bias Current vs Load Current
3.3V
OUT
12V
IN
24V
IN
40
35
BIAS CURRENT (mA)
30
25
20
15
10
5
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G08
Bias Current vs Load Current
5V
OUT
12V
IN
24V
IN
20
BIAS CURRENT (mA)
15
10
5
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G09
8025f
4
LTM8025
TYPICAL PERFORMANCE CHARACTERISTICS
Bias Current vs Load Current
8V
OUT
80
70
BIAS CURRENT (mA)
60
50
40
30
20
10
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G10
T
A
= 25°C, unless otherwise noted.
Bias Current vs Load Current
18V
OUT
120
100
BIAS CURRENT (mA)
80
24V
IN
60
40
20
0
0
500
1000
LOAD CURRENT (mA)
1500
8025 G12
Bias Current vs Load Current
12V
OUT
70
60
BIAS CURRENT (mA)
50
40
24V
IN
30
20
10
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G11
12V
IN
24V
IN
Input Current vs Load Current
2.5V
OUT
2500
5V
IN
12V
IN
24V
IN
32V
IN
2500
Input Current vs Load Current
3.3V
OUT
5.5V
IN
12V
IN
24V
IN
32V
IN
1600
1400
INPUT CURRENT (mA)
1200
1000
800
600
400
200
Input Current vs Load Current
5V
OUT
12V
IN
24V
IN
32V
IN
2000
INPUT CURRENT (mA)
2000
INPUT CURRENT (mA)
1500
1500
1000
1000
500
500
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G13
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G14
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G15
Input Current vs Load Current
8V
OUT
2500
12V
IN
24V
IN
32V
IN
INPUT CURRENT (mA)
3000
2500
2000
1500
1000
500
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G16
Input Current vs Load Current
12V
OUT
16V
IN
24V
IN
32V
IN
INPUT CURRENT (mA)
3000
2500
2000
1500
1000
500
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G17
Input Current vs Load Current
18V
OUT
24V
IN
32V
IN
2000
INPUT CURRENT (mA)
1500
1000
500
0
0
1000
2000
LOAD CURRENT (mA)
3000
8025 G18
8025f
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stm32/stm8
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