LTM8065
40V
IN
, 2.5A Silent Switcher
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
8065
is a 40V
IN
, 3.5A peak, 2.5A continuous
step-down µModule
®
(power module) regulator. Included in
the package are the switching controller, power switches,
inductor and all support components. Operating over an
input voltage range of 3.4V to 40V, the LTM8065 supports
an output voltage range of 0.97V to 18V and a switching
frequency range of 200kHz to 3MHz, each set by a single
resistor. Only the input and output filter capacitors are
needed to finish the design.
The low profile package enables utilization of unused
space on the bottom of PC boards for high density point of
load regulation. The LTM8065 is packaged in a thermally
enhanced, compact over-molded ball grid array (BGA) pack-
age suitable for automated assembly by standard surface
mount equipment. The LTM8065 is RoHS compliant.
All registered trademarks and trademarks are the property of their respective owners.
Complete Step-Down Switch Mode Power Supply
Low Noise Silent Switcher
®
Architecture
Wide Input Voltage Range: 3.4V to 40V
Wide Output Voltage Range: 0.97V to 18V
2.5A Continuous Output Current, 3.5A Peak
Selectable Switching Frequency: 200kHz to 3MHz
External Synchronization
Programmable Soft-Start
Tiny, Low Profile 6.25mm × 6.25mm × 2.32mm
RoHS Compliant BGA Package
APPLICATIONS
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Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
TYPICAL APPLICATION
Efficiency vs Load Current
5V
OUT
from 7V
IN
to 40V
IN
Step-Down Converter
V
IN
7V TO 40V
2.2µF
RT
41.2k
1MHz
GND
SYNC
FB
V
IN
RUN
LTM8065
BIAS
AUX
V
OUT
60.4k
22µF
95
V
IN
= 12V
V
OUT
5V
2.5A
3.5A PEAK
EFFICIENCY (%)
90
85
8065 TA01a
PINS NOT USED IN THIS CIRCUIT: TR/SS, PG
80
0
1
2
LOAD CURRENT (A)
3
8065 TA01b
Rev.B
Document Feedback
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1
LTM8065
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
GND
A
FB
B
C
D
BANK 1
E
F
BANK 3 V
OUT
1
2
3
4
5
6
GND
AUX
SYNC TR/SS
RUN
BANK 2
V
IN
BIAS
PG
GND
RT
GND
V
IN
, RUN, PG Voltage .............................................. 42V
AUX, V
OUT
, BIAS Voltage ........................................ 19V
FB, TR/SS Voltage ..................................................... 4V
SYNC Voltage ............................................................ 6V
Maximum Internal Temperature .......................... 125°C
Storage Temperature ............................ –55°C to 125°C
Peak Reflow Solder Body Temperature ............... 260°C
BGA PACKAGE
36-LEAD (6.25mm × 6.25mm × 2.32mm) BGA PACKAGE
T
JMAX
= 125°C,
θ
JA
= 21°C/W,
θ
JCbottom
= 5.9°C/W
θ
JCtop
= 36.5°C/W,
θ
JB
= 6.3°C/W, WEIGHT = 0.5g
θ
VALUES DETERMINED PER JEDEC51-9, 51-12
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM8065EY#PBF
LTM8065IY#PBF
TERMINAL FINISH
SAC305 (RoHS)
DEVICE
LTM8065
FINISH CODE
e1
PACKAGE
TYPE
BGA
MSL
RATING
3
TEMPERATURE RANGE
–40°C to 125°C
• Contact the factory for parts specified with wider operating temperature
ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures
•
LGA and BGA Package and Tray Drawings
Rev.B
2
For more information
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LTM8065
The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 12V, RUN = 2V, unless otherwise noted.
PARAMETER
Minimum Input Voltage
Output DC Voltage
Peak Output DC Current
Quiescent Current into V
IN
Quiescent Current into BIAS
CONDITIONS
V
IN
Rising
R
FB
Open
R
FB
= 14.3kΩ, V
IN
= 40V
V
OUT
= 3.3V, f
SW
= 1MHz
RUN = 0V
BIAS = 0V, No Load, SYNC = 0V, Not Switching
BIAS = 5V, RUN = 0V
BIAS = 5V, No Load, SYNC = 0V, Not Switching
BIAS = 5V, V
OUT
= 3.3V, I
OUT
= 2.5A, f
SW
= 1MHz
5.5V < V
IN
< 36V, I
OUT
= 1A
0.1A < I
OUT
< 2.5A
I
OUT
= 2.5A
R
T
= 232kΩ
R
T
= 41.2kΩ
R
T
= 10.7kΩ
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ELECTRICAL CHARACTERISTICS
MIN
TYP
0.97
18
MAX
3.4
UNITS
V
V
V
A
3.5
3
8
1
5
12
0.5
0.5
10
200
1
3
950
0.9
970
980
3.2
1.06
1
2
200
1.05
0.89
1
150
0.4
2.9
1.5
4.2
35
µA
µA
µA
µA
mA
%
%
mV
kHz
MHz
MHz
mV
V
V
µA
µA
Ω
V
V
µA
µA
V
V
µA
Line Regulation
Load Regulation
Output Voltage Ripple
Switching Frequency
Voltage at FB
Minimum BIAS Voltage
RUN Threshold Voltage
RUN Current
TR/SS Current
TR/SS Pull Down
PG Threshold Voltage at FB (Upper)
PG Threshold Voltage at FB (Lower)
PG Leakage Current
PG Sink Current
SYNC Threshold Voltage
SYNC Voltage
SYNC Current
TR/SS = 0V
TR/SS = 0.1V
FB Falling (Note 6)
FB Rising (Note 6)
PG = 42V
PG = 0.1V
Synchronization
To Enable Spread Spectrum
SYNC = 0V
(Note 5)
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:
Unless otherwise noted, the absolute minimum voltage is zero.
Note 3:
The LTM8065E 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
LTM8065I is guaranteed to meet specifications over the full –40°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:
The LTM8065 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.
Note 5:
Below this specified voltage, internal circuitry will draw power
from V
IN
.
Note 6:
PG transitions from low to high.
Rev.B
For more information
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3
LTM8065
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency, V
OUT
= 0.97V,
BIAS = 5V
85
85
T
A
= 25°C, unless otherwise noted.
Efficiency, V
OUT
= 1.5V,
BIAS = 5V
90
Efficiency, V
OUT
= 1.2V,
BIAS = 5V
75
EFFICIENCY (%)
EFFICIENCY (%)
75
EFFICIENCY (%)
80
65
65
70
55
45
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G01
55
60
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G02
45
50
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G03
Efficiency, V
OUT
= 1.8V,
BIAS = 5V
90
90
Efficiency, V
OUT
= 2V,
BIAS = 5V
90
Efficiency, V
OUT
= 2.5V,
BIAS = 5V
80
EFFICIENCY (%)
EFFICIENCY (%)
80
EFFICIENCY (%)
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G05
80
70
70
70
60
60
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G04
60
50
50
50
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G06
Efficiency, V
OUT
= 3.3V,
BIAS = 5V
95
95
Efficiency, V
OUT
= 5V,
BIAS = 5V
100
Efficiency, V
OUT
= 8V,
BIAS = 5V
85
EFFICIENCY (%)
EFFICIENCY (%)
85
EFFICIENCY (%)
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G08
90
75
75
80
65
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G07
65
70
12V
IN
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G09
55
55
60
Rev.B
4
For more information
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LTM8065
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency, V
OUT
= 12V,
BIAS = 5V
100
100
T
A
= 25°C, unless otherwise noted.
Efficiency, V
OUT
= 18V,
BIAS = 5V
100
Efficiency, V
OUT
= 15V,
BIAS = 5V
90
EFFICIENCY (%)
EFFICIENCY (%)
90
EFFICIENCY (%)
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8002 G11
90
80
80
80
70
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G10
70
70
24V
IN
36V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G12
60
60
60
Efficiency, V
OUT
= –3.3V,
BIAS tied to LTM8065 GND
85
90
Efficiency, V
OUT
= –5V,
BIAS tied to LTM8065 GND
90
Efficiency, V
OUT
= –8V,
BIAS tied to LTM8065 GND
80
EFFICIENCY (%)
EFFICIENCY (%)
80
EFFICIENCY (%)
80
75
70
70
70
65
60
12V
IN
24V
IN
35V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G13
60
12V
IN
24V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G14
60
50
50
12V
IN
24V
IN
0
1
2
LOAD CURRENT (A)
3
8065 G15
Efficiency, V
OUT
= –12V, BIAS tied
to LTM8065 GND
85
90
Efficiency, V
OUT
= –15V, BIAS tied
to LTM8065 GND
85
Efficiency, V
OUT
= –18V, BIAS tied
to LTM8065 GND
80
EFFICIENCY (%)
EFFICIENCY (%)
80
EFFICIENCY (%)
12V
IN
24V
IN
0
0.5
1
LOAD CURRENT (A)
1.5
8065 G17
80
75
75
70
70
70
65
12V
IN
24V
IN
0
0.5
1
1.5
LOAD CURRENT (A)
2
8065 G16
60
65
12V
IN
0
0.25
0.50
0.75
LOAD CURRENT (A)
1
1.25
8065 G18
60
50
60
Rev.B
For more information
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5
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