LTM8027
60V, 4A DC/DC µModule
Regulator
FEATURES
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DESCRIPTION
The LTM
®
8027 is a complete 4A, DC/DC step-down power
supply. Included in the package are the switching control-
ler, power switches, inductor and all support components.
Operating over an input voltage range of 4.5V to 60V (7.5V
minimum voltage to start), the LTM8027 supports output
voltages up to 24V, and a switching frequency range of
100kHz to 500kHz, 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 den-
sity point of load regulation. A built-in soft-start timer is
adjustable with a small capacitor.
The LTM8027 is packaged in a thermally enhanced, compact
(15mm
×
15mm) and low profile (4.32mm) over-molded
land grid array (LGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8027 is Pb-free and RoHS compliant.
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.
Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 60V
(7.5V Minimum Voltage to Start)
Wide Output Voltage Range: 2.5V to 24V
(See Table 2)
4A Output Current
Programmable Soft-Start
10μA Shutdown Supply Current
Selectable Switching Frequency Current Mode
Control
Up to 95% Efficiency
Pb-Free (e4) RoHS Compliant Package with
Gold Pad Finish
Tiny, Low Profile (15mm
×
15mm
×
4.32mm)
Surface Mount LGA Package
APPLICATIONS
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12V and 42V Automotive and Heavy Equipment
48V Telecom Power Supplies
Avionics and Industrial Control Systems
Distributed Power Converters
TYPICAL APPLICATION
48W, 16V
IN
to 60V
IN
DC/DC μModule
®
Regulator
V
IN
16V TO 60V
V
IN
1M
RUN
SS
SYNC
RT
48.7k
GND
LTM8027
BIAS1
22μF
4
56.2k
EFFICIENCY (%)
BIAS2
AUX
ADJ
V
OUT
V
OUT
12V
4A
100
90
80
70
60
50
40
30
3845 TA01a
Efficiency vs Load
24V
IN
4.7μF
2
20
10
0
0
1
2
LOAD (A)
3
4
8027 TA01b
8027f
1
LTM8027
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
11
10
9
8
AUX 7
BIAS1 6
SS 5
RUN 4
BIAS2 3
ADJ 2
1
A B C D E F G H J K L
SYNC
RT
LGA PACKAGE
113-LEAD (15mm 15mm 4.32mm)
T
JMAX
= 125°C,
θ
JA
= 12.2°C/W,
θ
JC(TOP)
= 9.3°C/W,
θ
JC(BOTTOM)
= 3.6°C/W,
θ
JBOARD
= 7.54°C/W
θ
VALUES DETERMINED PER JESD 51-9
WEIGHT = 2.6 GRAMS
V
OUT
BANK 1
V
IN
Voltage ................................................................65V
BIAS1, BIAS2 ............................................................15V
SYNC, ADJ, R
T
, RUN, SS Voltages ..............................5V
Current Into RUN Pin (Note 2) .................................1mA
V
OUT
, AUX .................................................................25V
Current Out of AUX ............................................. 200mA
Internal Operating Temperature
(Note 3).................................................. –40°C to 125°C
Maximum Soldering Temperature ......................... 245°C
Storage Temperature Range .................. –55°C to 125°C
GND
BANK 2
V
IN
BANK 3
ORDER INFORMATION
LEAD FREE FINISH
LTM8027EV#PBF
LTM8027IV#PBF
LTM8027MPV#PBF
TRAY
LTM8027EV#PBF
LTM8027IV#PBF
LTM8027MPV#PBF
PART MARKING
LTM8027V
LTM8027V
LTM8027V
PACKAGE DESCRIPTION
INTERNAL TEMPERATURE RANGE
113-Lead (15mm
×
15mm
×
4.32mm) LGA –40°C to 125°C
113-Lead (15mm
×
15mm
×
4.32mm) LGA –40°C to 125°C
113-Lead (15mm
×
15mm
×
4.32mm) LGA –55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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://linear.com/packaging/
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT
I
OUT
V
IN(START)
ΔV
OUT
/ΔV
IN
ΔV
OUT
/ΔI
LOAD
V
UVLO(RISING)
V
UVLO(FALLING)
PARAMETER
Input DC Voltage
Maximum Output DC Voltage
Output DC Current
Minimum Start Voltage
Line Regulation
Load Regulation
Input Undervoltage Lockout Threshold
(Rising)
Input Undervoltage Lockout Threshold
(Falling)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 20V, BIAS1 = BIAS2 = 10V, RUN = 2V, unless otherwise noted.
CONDITIONS
(Note 5)
0 < I
OUT
≤ 4A, V
IN
= 48V
V
IN
≤ 60V, V
OUT
= 12V, (Note 4)
V
OUT
= 12V, 15V< V
IN
< 60V, I
LOAD
= 4A
V
OUT
= 12V, V
IN
= 24V, 0A < I
LOAD
≤ 4A
(Note 5)
(Note 5)
0
0.2
0.2
4.6
3.7
l
MIN
4.5
TYP
24
MAX
60
4
7.5
UNITS
V
V
A
V
%
%
V
V
8027f
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LTM8027
ELECTRICAL CHARACTERISTICS
SYMBOL
V
ADJ
IQ
VIN
V
BIAS1
I
BIAS1
V
BIAS2
I
BIAS2
V
BIAS(MINOV)
R
FB
V
RUN(RISING)
V
RUN(FALLING)
f
SW
R
SYNC
V
SYNC(TH)
I
SS
PARAMETER
ADJ Voltage
Quiescent Current into IN
BIAS1 Undervoltage Lockout (Rising)
BIAS1 Undervoltage Lockout (Falling)
Current into BIAS1
Minimum BIAS2 Voltage
Current Into BIAS2
Minimum Voltage to Overdrive INTV
CC
Regulator
Internal Feedback Resistor
RUN Enable Voltage (Rising)
RUN Enable Voltage (Falling)
Switching Frequency
SYNC Input Resistance
SYNC Voltage Threshold
Soft-Start Charging Current
f
SYNC
= 350kHz
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 20V, BIAS1 = BIAS2 = 10V, RUN = 2V, unless otherwise noted.
CONDITIONS
l
MIN
1.224
1.215
TYP
MAX
1.238
1.245
UNITS
V
V
mA
μA
V
V
mA
μA
V
μA
V
kΩ
V
V
kHz
kHz
kΩ
V
μA
V
BIAS
= V
AUX
, V
OUT
= 12VDC, No Load
V
RUN
= 0V
39
9
6.5
6
No Load
RUN = 0V
25
25
6
1
8.5
499
1.4
1.2
R
T
= 187kΩ
R
T
= 23.7kΩ
2.3
100
500
40
2
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 RUN pin is internally clamped to 5V
Note 3:
The LTM8027E 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 LTM8027I is guaranteed to meet specifications over the full
–40°C to 125°C internal operating temperature range. The LTM8027MP
is guaranteed to meet specifications over the full –55°C to 125°C
internal operating 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 maximum continuous output current may be derated by the
LTM8027 junction temperature.
Note 5:
V
IN
voltages below the start-up threshold (7.5V) are only
supported when the V
CC
is externally driven above 6.5V.
8027f
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LTM8027
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Efficiency vs Load, V
OUT
= 2.5V
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
5V
IN
12V
IN
24V
IN
36V
IN
4
8027 G01
Efficiency vs Load, V
OUT
= 3.3V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
5V
IN
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
4
8027 G02
Efficiency vs Load, V
OUT
= 5V
100
90
80
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
4
8027 G03
Efficiency vs Load, V
OUT
= 8V
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
4
8027 G04
Efficiency vs Load, V
OUT
= 12V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
24V
IN
36V
IN
48V
IN
60V
IN
4
8027 G05
Efficiency vs Load, V
OUT
= 15V
100
90
80
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
24V
IN
36V
IN
48V
IN
60V
IN
4
8027 G06
Efficiency vs Load, V
OUT
= 18V
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
24V
IN
36V
IN
48V
IN
60V
IN
4
8027 G07
Efficiency vs Load, V
OUT
= 24V
100
90
80
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
36V
IN
48V
IN
60V
IN
4
8027 G08
Input Current
vs V
IN
Output Shorted
3000
2500
INPUT CURRENT (mA)
2000
1500
1000
500
0
0
10
20
30
V
IN
(V)
40
50
60
8027 G09
8027f
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LTM8027
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Input Current vs Load,
V
OUT
= 2.5V
3000
2500
INPUT CURRENT (mA)
2000
1500
1000
500
0
0
1
2
LOAD (A)
3
4
8027 G43
Input Current vs Load,
V
OUT
= 3.3V
3500
2000
5V
IN
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
1800
1600
INPUT CURRENT (mA)
1400
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
0
1
2
LOAD (A)
8027 G10
Input Current vs Load,
V
OUT
= 5V
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
5V
IN
12V
IN
24V
IN
36V
IN
1200
1000
800
600
400
200
3
4
0
0
1
2
LOAD (A)
3
4
8027 G11
Input Current vs Load,
V
OUT
= 8V
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
0
1
2
LOAD (A)
8027 G12
Input Current vs Load,
V
OUT
= 12V
2500
24V
IN
36V
IN
48V
IN
60V
IN
3000
2500
INPUT CURRENT (mA)
2000
1500
1000
500
0
Input Current vs Load,
V
OUT
= 15V
24V
IN
36V
IN
48V
IN
60V
IN
INPUT CURRENT (mA)
4
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
2000
1500
1000
500
3
0
0
1
2
LOAD (A)
3
4
8027 G13
0
1
2
LOAD (A)
3
4
8027 G14
Input Current vs Load,
V
OUT
= 18V
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
0
1
2
LOAD (A)
3
4
8027 G15
Input Current vs Load,
V
OUT
= 24V
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
0
1
2
LOAD (A)
3
4
8027 G16
Bias Current vs Load,
V
OUT
= 2.5V
15.50
15.00
BIAS CURRENT (mA)
14.50
14.00
13.50
13.00
12.50
12.00
36V
IN
24V
IN
12V
IN
0
1
2
LOAD (A)
8027 G17
24V
IN
36V
IN
48V
IN
60V
IN
36V
IN
48V
IN
60V
IN
3
4
8027f
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