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, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
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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
9µA 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
4.7µF
×2
V
IN
1M
RUN
SS
SYNC
RT
48.7k
GND
LTM8027
BIAS1
AUX
ADJ
56.2k
22µF
×4
EFFICIENCY (%)
BIAS2
V
OUT
V
OUT
12V
4A
100
90
80
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
4
8027 TA01b
Efficiency vs Load
24V
IN
3845 TA01a
8027fb
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 ........................................................................15V
BIAS2 ........................................................................24V
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)
E-, I-Grade ......................................... –40°C to 125°C
MP-Grade .......................................... –55°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
TEMPERATURE RANGE (Note 3)
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.
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
SYMBOL
V
IN
V
OUT
I
OUT
V
IN(START)
∆V
OUT
/∆V
IN
∆V
OUT
/∆I
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 internal 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)
0A < 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
8027fb
2
LTM8027
elecTrical characTerisTics
SYMBOL
V
ADJ
I
Q(VIN)
V
BIAS1
I
BIAS1
V
BIAS2
I
BIAS2
V
BIAS1(MINOV)
R
FB
V
RUN(RISING)
V
RUN(FALLING)
f
SW
R
SYNC
V
SYNC(TH)
I
SS
PARAMETER
ADJ Voltage
l
The
l
denotes the specifications which apply over the full internal operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 20V, BIAS1 = BIAS2 = 10V, RUN = 2V, unless otherwise noted.
CONDITIONS
MIN
1.224
1.215
39
9
6.5
6
No Load
RUN = 0V
25
25
3
1
8.5
499
1.4
1.2
R
T
= 187kΩ
R
T
= 23.7kΩ
f
SYNC
= 350kHz
l
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
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 Internal
Regulator (INTV
CC
)
Internal Feedback Resistor
RUN Enable Voltage (Rising)
RUN Enable Voltage (Falling)
Switching Frequency
SYNC Input Resistance
SYNC Voltage Threshold
Soft-Start Charging Current
V
BIAS
= V
AUX
, V
OUT
= 12VDC, No Load
V
RUN
= 0V
100
500
40
2.3
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 BIAS1 is externally driven above 6.5V.
8027fb
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LTM8027
Typical perForMance characTerisTics
(T
A
= 25°C unless otherwise noted)
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
= 2.5V
100
90
80
Efficiency vs Load, V
OUT
= 3.3V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
4
0
Efficiency vs Load, V
OUT
= 5V
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
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
0
1
2
LOAD (A)
3
4
8027 G03
8027 G02
100
90
80
EFFICIENCY (%)
Efficiency vs Load, V
OUT
= 8V
100
90
80
EFFICIENCY (%)
Efficiency vs Load, V
OUT
= 12V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
4
0
Efficiency vs Load, V
OUT
= 15V
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
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
24V
IN
36V
IN
48V
IN
60V
IN
24V
IN
36V
IN
48V
IN
60V
IN
0
1
2
LOAD (A)
3
4
8027 G06
8027 G05
100
90
80
EFFICIENCY (%)
Efficiency vs Load, V
OUT
= 18V
100
90
80
Efficiency vs Load, V
OUT
= 24V
1.2
1.0
INPUT CURRENT (A)
0.8
0.6
0.4
0.2
0
Input Current
vs V
IN
Output Shorted
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 (%)
70
70
60
50
40
30
20
10
0
0
1
2
LOAD (A)
3
36V
IN
48V
IN
60V
IN
4
8027 G08
0
10
40
30
50
20
INPUT VOLTAGE (V)
60
70
8027 G09
8027fb
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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
5V
IN
12V
IN
24V
IN
36V
IN
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
1
2
LOAD (A)
3
4
8027 G10
Input Current vs Load,
V
OUT
= 3.3V
5V
IN
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
2000
1800
1600
INPUT CURRENT (mA)
1400
1000
800
600
400
200
0
1
2
LOAD (A)
8027 G11
Input Current vs Load,
V
OUT
= 5V
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
1200
0
3
4
0
0
1
2
LOAD (A)
3
4
8027 G12
Input Current vs Load,
V
OUT
= 8V
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
0
1
2
LOAD (A)
8027 G13
Input Current vs Load,
V
OUT
= 12V
2500
2000
INPUT CURRENT (mA)
24V
IN
36V
IN
48V
IN
60V
IN
INPUT CURRENT (mA)
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
3000
2500
2000
1500
1000
500
0
Input Current vs Load,
V
OUT
= 15V
24V
IN
36V
IN
48V
IN
60V
IN
1500
1000
500
3
4
0
0
1
2
LOAD (A)
3
4
8027 G14
0
1
2
LOAD (A)
3
4
8027 G15
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
0
Input Current vs Load,
V
OUT
= 18V
24V
IN
36V
IN
48V
IN
60V
IN
3500
3000
INPUT CURRENT (mA)
2500
2000
1500
1000
500
Input Current vs Load,
V
OUT
= 24V
36V
IN
48V
IN
60V
IN
BIAS CURRENT (mA)
15.50
15.00
14.50
14.00
13.50
13.00
12.50
0
1
2
LOAD (A)
3
4
8027 G17
Bias Current vs Load,
V
OUT
= 2.5V
0
1
2
LOAD (A)
3
4
8027 G16
0
12.00
36V
IN
24V
IN
12V
IN
0
1
2
LOAD (A)
8027 G18
3
4
8027fb
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