power supply. Included in the package are the switch-
ing controller, power switches, inductor, and all support
components. Operating over an input voltage range of 4V
to 36V, the LTM8020 supports an output voltage range of
1.25V to 5V, set by a single resistor. Only bulk capacitors
are needed to finish the design.
The low profile (2.32mm) tiny package enables utilization
of unused space on the bottom of PC boards for high
density point of load regulation.
The LTM8020 is packaged in a thermally enhanced,
compact (6.25mm
×
6.25mm) and low profile (2.32mm)
over-molded Land Grid Array (LGA) package suitable for
automated assembly by standard surface mount equip-
ment. The LTM8020 is Pb-free and RoHS compliant.
L,
LT, LTC and LTM 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: 4V to 36V
1.25V to 5V Output Voltage
200mA Output Current
Current Mode Control
–55°C to 125°C Operating Temperature
(LTM8020MPV)
Pb-Free (e4) RoHS Compliant Package with Gold Pad
Finish
Tiny, Low Profile (6.25mm
×
6.25mm
×
2.32mm)
Surface Mount LGA Package
APPLICATIONS
n
n
n
n
n
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
TYPICAL APPLICATION
6.5V
IN
to 36V
IN
, 5V at 200mA DC/DC μModule Regulator
V
IN
*
6.5V TO 36V
2.2μF
V
IN
SHDN
GND
V
OUT
LTM8020
BIAS
EFFICIENCY (%)
ADJ
165k
1%
10μF
V
OUT
5V
200mA
Efficiency and Power Loss vs Load Current
90
80
70
60
50
40
30
20
10
0.1
0.1
1
10
LOAD CURRENT (mA)
100
3470 TA01b
1000
100
POWER LOSS (mW)
10
8020 TA01
1
*
RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS
8020fb
1
LTM8020
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
5
V
OUT
4
GND
3
2
V
IN
1
A
SHDN
B
C
D
E
ADJ
BIAS
V
IN
,
SHDN
Voltage ....................................................40V
ADJ Voltage ................................................................5V
BIAS Voltage .............................................................25V
V
IN
+ BIAS Voltage ....................................................47V
V
OUT
Voltage .............................................................10V
Internal Operating Temperature Range... –40°C to 125°C
Storage Temperature Range................... –55°C to 125°C
Maximum Solder Temperature .............................. 260°C
LGA PACKAGE
21-LEAD (6.25mm 6.25mm 2.32mm)
T
JMAX
= 125°C,
θ
JA
= 23.1°C/W
θ
JA
DERIVED FROM 5cm
×
5cm PCB WITH 4 LAYERS
WEIGHT = 0.25g
ORDER INFORMATION
LEAD FREE FINISH
LTM8020EV#PBF
LTM8020IV#PBF
LTM8020MPV#PBF
PART MARKING*
LTM8020V
LTM8020V
LTM8020MPV
PACKAGE DESCRIPTION
21-Lead (6.25mm
×
6.25mm)
21-Lead (6.25mm
×
6.25mm)
21-Lead (6.25mm
×
6.25mm)
TEMPERATURE RANGE (Note 2)
–40°C to 85°C
–40°C to 85°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= 10V, V
BIAS
= 3V, External C
IN
= 2.2μF C
OUT
= 4.7μF
,
.
(Note 2)
SYMBOL
V
IN
V
OUT
R
ADJ(MIN)
I
LK
I
OUT
IQ
VIN
PARAMETER
Input DC Voltage
Output DC Voltage
Minimum Allowable R
ADJ
Leakage from IN to OUT
Continuous Output DC Current
Quiescent Current into IN
0 < I
OUT
≤ 200mA; 167kΩ < R
ADJ
< ∞
(Note 3)
V
SHDN
= 0V, BIAS = 0V
5.5V ≤ V
IN
≤ 36V, R
ADJ
= 301k, V
O
= 3.3V
SHDN
= 0.2V, BIAS OPEN
BIAS = 3V, Not Switching
BIAS = 0V, Not Switching
SHDN
= 0.2V, BIAS = 0V
BIAS = 3V, Not Switching
BIAS = 0V, Not Switching
5V ≤ V
IN
≤ 36V, I
OUT
= 200mA, R
ADJ
Open
V
IN
= 24V, 0 ≤ I
OUT
≤ 200mA, V
OUT
= 3.3V
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
MIN
4
1.2
163
TYP
MAX
36
5
UNITS
V
V
kΩ
μA
mA
μA
μA
μA
μA
μA
μA
%
%
1.2
0
10
35
25
1
2
6
200
1
18
50
0.5
60
1.5
IQ
BIAS
Quiescent Current into BIAS
l
ΔV
OUT
/V
OUT
ΔV
OUT
/V
OUT
Line Regulation
Load Regulation
8020fb
2
LTM8020
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OUT(AC_RMS)
f
SW
I
SC
V
ADJ
V
BIAS(MIN)
I
ADJ
I
SHDN
V
IH(SHDN)
V
IL(SHDN)
PARAMETER
Output Ripple (RMS)
Switching Frequency
Output Short Circuit Current
Voltage at ADJ Pin
Minimum BIAS Voltage for Proper
Operation
Current Out of ADJ Pin
SHDN
Pin Current
SHDN
Input High Voltage
SHDN
Input Low Voltage
ADJ = 0V, V
OUT
= 5V, V
SHDN
= 0V
V
SHDN
= 2.5V
2.5
0.2
The
l
denotes the specifications which apply over the full operating
,
.
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= 10V, V
BIAS
= 3V, External C
IN
= 2.2μF C
OUT
= 4.7μF
(Note 2)
CONDITIONS
I
OUT
= 100mA, V
OUT
= 3.3V, V
IN
= 24V
I
OUT
= 200mA
V
IN
= 36V, V
OUT
= 0V
l
l
l
MIN
TYP
7.5
450
350
MAX
UNITS
mV
kHz
mA
1.228
3
9.65
1
1.265
V
V
10.35
5
μA
μA
V
V
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 LTM8020E is guaranteed to meet performance specifications
from 0°C to 85°C ambient. Specifications over the full –40°C to
85°C ambient operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM8020I is guaranteed to meet specifications over the full –40°C to 85°C
ambient operating temperature range. The LTM8020MP 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 3:
Guaranteed by design.
TYPICAL PERFORMANCE CHARACTERISTICS
3.3V
OUT
Efficiency
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0.1
1
10
I
LOAD
(mA)
100
5V
IN
12V
IN
24V
IN
36V
IN
1000
8020 G01
T
A
= 25°C unless otherwise noted.
3.3V
OUT
Power Loss
1000
90
80
100
POWER LOSS (mW)
EFFICIENCY (%)
5V
IN
12V
IN
24V
IN
36V
IN
1
10
I
OUT
(mA)
100
1000
8020 G02
5V
OUT
Efficiency
70
60
50
40
30
20
10
0
0.1
1
10
I
LOAD
(mA)
100
12V
IN
24V
IN
36V
IN
1000
8020 G03
10
1
0.1
0.1
8020fb
3
LTM8020
TYPICAL PERFORMANCE CHARACTERISTICS
5V
OUT
Power Loss
1000
0.18
0.16
100
POWER LOSS (mW)
0.14
INPUT CURRENT (A)
0.12
0.10
0.08
0.06
0.04
12V
IN
24V
IN
36V
IN
1
10
I
OUT
(mA)
100
1000
8020 G04
T
A
= 25°C unless otherwise noted.
Input Current vs Output Current
(12V
IN
)
0.120
0.100
INPUT CURRENT (A)
0.080
0.060
0.040
0.020
1.8V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
Input Current vs Output Current
(5V
IN
)
1.8V
OUT
2.5V
OUT
3.3V
OUT
10
1
0.02
0
0
0.05
0.10
0.15
OUTPUT CURRENT (A)
0.20
4356 G05
0.1
0.1
0
0
0.05
0.10
0.15
OUTPUT CURRENT (A)
0.20
4356 G06
Input Current vs Output Current
(24V
IN
)
0.060
0.050
INPUT CURRENT (A)
0.040
0.030
0.020
0.010
0.005
0
0
0.05
0.10
0.15
OUTPUT CURRENT (A)
0.20
4356 G07
Input Current vs Output Current
(36V
IN
)
0.045
0.040
0.035
INPUT CURRENT (A)
0.030
0.025
0.020
0.015
0.010
1.8V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
5
Input Quiescent Current vs Input
Voltage
QUIESCENT CURRENT (μA)
1.8V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
4
3
2
1
0
0
0.05
0.10
0.15
OUTPUT CURRENT (A)
0.20
4356 G08
0
0
10
20
30
INPUT VOLTAGE (V)
40
4356 G09
Input Current vs Input Voltage
(Output Short)
100
6.0
5.5
INPUT VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
0
10
20
30
INPUT VOLTAGE (V)
40
4356 G10
Minimum Required Input Voltage
vs Load (V
OUT
= 3.3V)
TO START
8
7
SHDN
CONTROL
INPUT VOLTAGE (V)
6
5
4
3
2
0
50
100
150
LOAD CURRENT (mA)
200
4356 G11
Minimum Required Input Voltage
vs Output Voltage
I
OUT
= 200mA
TO START
80
INPUT CURRENT (mA)
60
TO RUN
40
TO RUN
20
0
1
2
3
4
OUTPUT VOLTAGE (V)
5
4356 G12
8020fb
4
LTM8020
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Rise vs Input
Voltage (Full Load, T
A
= 25°C)
25
INPUT CURRENT
100mA/DIV
V
OUT
2V/DIV
SHDN
5V/DIV
50μs/DIV
8020 G14
T
A
= 25°C unless otherwise noted.
Turn-On Behavior
(6V
IN
, 3.3V
OUT
, No Load)
TEMPERATURE RISE (°C)
20
5V
OUT
15
3.3V
OUT
10
5
0
0
10
20
30
INPUT VOLTAGE (V)
40
50
8020 G13
PIN FUNCTIONS
V
IN
(Pins A1, A2):
The V
IN
pins supply current to the
LTM8020’s internal regulator and to the internal power
switch. These pins must be locally bypassed with an
external, low ESR capacitor of at least 1μF
.
V
OUT
(Pins A4, A5, B4, B5, C4, C5):
Power Output Pins.
An external capacitor is connected from V
OUT
to GND in
most applications. Apply output load between these pins
and GND.
BIAS (Pin C3):
The BIAS pin connects to the internal
boost Schottky diode and to the internal regulator. Tie to
V
OUT
when V
OUT
> 3V or to another DC voltage greater
than 3V otherwise. When BIAS > 3V the internal circuitry
will be powered from this pin to improve efficiency. Main
regulator power will still come from V
IN
.
SHDN
(Pin C1):
The SHDN pin is used to put the LTM8020 in
shutdown mode. Tie to ground to shut down the LTM8020.
Apply 2V or more for normal operation. If the shutdown
