LINER LTM8032IVPBF Ultralow noise emc compliant 36v, 2a dc/dc î¼module Datasheet

LTM8032
Ultralow Noise
EMC Compliant 36V, 2A
DC/DC µModule
DESCRIPTION
FEATURES
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Complete Step-Down Switch Mode Power Supply
Wide Input Voltage Range: 3.6V to 36V
2A Output Current
0.8V to 10V Output Voltage
Selectable Switching Frequency: 200kHz to 2.4MHz
EN55022 Class B Compliant
Current Mode Control
(e4) RoHS Compliant Package with Gold Pad Finish
Programmable Soft-Start
Low Profile (9mm × 15mm × 2.82mm)
Surface Mount LGA Package
APPLICATIONS
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Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
The LTM®8032 is an electromagnetic compatible (EMC)
36V, 2A DC/DC μModule® buck converter designed to
meet the radiated emissions requirements of EN55022.
Conducted emission requirements can be met by adding
standard filter components. Included in the package are the
switching controller, power switches, inductor, filters and
all support components. Operating over an input voltage
range of 3.6V to 36V, the LTM8032 supports an output
voltage range of 0.8V to 10V, 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 (2.82mm)
enables utilization of unused space on the bottom of PC
boards for high density point of load regulation.
The LTM8032 is packaged in a thermally enhanced, compact
(9mm × 15mm) and low profile (2.82mm) overmolded land
grid array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8032 is
RoHS compliant.
, LT, LTC, LTM and μModule are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Ultralow Noise 5V/2A DC/DC μModule Regulator
OUT
VIN
10μF
FIN
RUN/SS
AUX
LTM8032 BIAS
2.2μF
SHARE
PGOOD
RT SYNC GND ADJ
44.2k
47.5k
8032 TA01a
fSW = 700kHz
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
90
VOUT
5V
2A
80
EMISSIONS LEVEL (dBμV/m)
VIN*
7VDC TO 36VDC
LTM8032 EMI Performance
70
60
50
EN55022
CLASS B
LIMIT
40
30
20
10
0
–10
0
100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
8031 TA01b
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LTM8032
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
VIN, FIN, RUN/SS Voltage..........................................40V
ADJ, RT, SHARE Voltage .............................................5V
VOUT, AUX .................................................................10V
Current from AUX ................................................100mA
PGOOD, SYNC ..........................................................30V
BIAS ..........................................................................25V
VIN + BIAS .................................................................56V
Maximum Junction Temperature (Note 2)............. 125°C
Solder Temperature (Note 3)................................. 245°C
1
2
TOP VIEW
3
4
5
VOUT
6
GND
7
A
BANK 1
B
C
D
E
BANK 2
F
G
RT
H
SHARE
BIAS
J
ADJ
AUX
PGOOD
K
BANK 3
L
VIN
FIN RUN/SS SYNC
LGA PACKAGE
71-LEAD (9mm s 15mm s 2.82mm)
TJMAX = 125°C, θJA = 15.8°C/W, θJC = 5.5°C/W
θJA DERIVED FROM 6.35cm × 5.6 PCB WITH 4 LAYERS
WEIGHT = 1.2g
ORDER INFORMATION
LEAD FREE FINISH
TRAY
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTM8032EV#PBF
LTM8032EV#PBF
LTM8032V
71-Lead (9mm × 15mm × 2.82mm) LGA
–40°C to 125°C
LTM8032IV#PBF
LTM8032IV#PBF
LTM8032V
71-Lead (9mm × 15mm × 2.82mm) LGA
–40°C to 125°C
LTM8032MPV#PBF
LTM8032MPV#PBF
LTM8032MPV
71-Lead (9mm × 15mm × 2.82mm) LGA
–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/
8032fa
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LTM8032
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBIAS = 3V, unless otherwise specified.
SYMBOL
PARAMETER
VIN
Input DC Voltage
VOUT
Output DC Voltage
0.2A < IOUT ≤ 2A, RADJ Open
0.2A < IOUT ≤ 2A, RADJ = 21.6k
IOUT
Continuous Output DC Current
VIN = 24V
IQ(VIN)
VIN Quiescent Current
VRUN/SS = 0.2V
VBIAS = 3V, Not Switching
VBIAS = 0V, Not Switching
l
VRUN/SS = 0.2V
VBIAS = 3V, Not Switching
VBIAS = 0V, Not Switching
l
IQ(BIAS)
ΔVOUT
VOUT
BIAS Quiescent Current
CONDITIONS
MIN
l
TYP
3.6
MAX
36
0.8
10
UNITS
V
V
V
2
A
0.6
25
88
60
120
μA
μA
μA
0.03
60
1
120
5
μA
μA
μA
Line Regulation
10V ≤ VIN ≤ 36V, IOUT = 1A, VOUT = 3.3V
0.1
Load Regulation
VIN = 24V, 0.2A ≤ IOUT ≤ 2A, VOUT = 3.3V
0.3
%
6
mV
VOUT(AC_RMS) Output Ripple (RMS)
fSW
Switching Frequency
VADJ
Voltage at ADJ Pin
VBIAS(MIN)
Minimum BIAS Voltage for Proper Operation
VIN = 24V, IOUT = 2A, VOUT = 3.3V
RT = 113k
%
325
l
765
kHz
790
815
mV
1.9
2.8
V
10
μA
IADJ
Current Out of ADJ Pin
VRUN/SS = 0V, VADJ = 0V, VOUT = 1V
4
IRUN/SS
RUN/SS Pin Current
VRUN/SS = 2.5V
5
VIH(RUN/SS)
RUN/SS Input High Voltage
VIL(RUN/SS)
RUN/SS Input Low Voltage
VPG(TH)
ADJ Voltage Threshold for PGOOD to Switch
μA
2.5
V
0.2
730
IPGO
PGOOD Leakage
VPG = 30V
IPGSINK
PGOOD Sink Current
VPG = 0.4V
VSYNCIL
SYNC Input Low Threshold
fSYNC = 550kHz
VSYNCIH
SYNC Input High Threshold
fSYNC = 550kHz
ISYNC(BIAS)
SYNC Pin Bias Current
VSYNC = 0V, VBIAS = 0V
0.1
μA
VIN(RIPPLE)
550kHz Narrowband Conducted Emission
1MHz Narrowband Conducted Emission
3MHz Narrowband Conducted Emission
VIN = 24V, VOUT = 3.3V, IOUT = 2A, fSW = 550kHz,
5μH LISN
89
69
51
dBμV
dBμV
dBμV
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 LTM8032E is guaranteed to meet performance specifications
from 0°C to 125°C internal. Specifications over the –40°C to 125°C
internal temperature range are assured by design, characterization and
correlation with statistical process controls. LTM8032I is guaranteed
0.1
V
mV
200
1
800
μA
0.5
0.7
μA
V
V
to meet specifications over the full –40°C to 125°C internal operating
temperature range. The LTM8032MP 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: See Linear Technology Application Note 100.
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LTM8032
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
3.3VOUT Efficiency
5VOUT Efficiency
8VOUT Efficiency
100
100
90
90
80
80
70
70
70
60
50
40
30
10
0
0.01
50
40
0
0.01
1
0.1
OUTPUT CURRENT (A)
400
1800
12VIN
24VIN
36VIN
1600
1400
800
1200
600
400
1000
800
600
400
200
200
10
8031 G03
INPUT CURRENT (mA)
INPUT CURRENT (mA)
INPUT CURRENT (mA)
600
1
0.1
OUTPUT CURRENT (A)
Input Current vs Output Current,
8VOUT
12VIN
24VIN
36VIN
1000
800
200
1000
500
1500
OUTPUT CURRENT (mA)
0
0
2000
0
500
1000
1500
OUTPUT CURRENT (mA)
8032 G04
0
2000
Minimum Required Input Voltage
vs Load Current, VOUT = 2.5V
4.5
5.5
6
4
INPUT VOLTAGE (V)
12
INPUT VOLTAGE (V)
6.0
4.0
3.5
3.0
2
0
2
4
6
8
OUTPUT VOLTAGE (V)
10
8032 G07
5.0
4.5
4.0
TO RUN
TO START
RUN/SS ENABLED
3.5
2.5
TO RUN
TO START
2.0
0
500
1000
1500
LOAD CURRENT (mA)
2000
8032 G08
2000
Minimum Required Input Voltage
vs Load Current, VOUT = 3.3V
5.0
8
1000
500
1500
OUTPUT CURRENT (mA)
8032 G06
14
10
1
8032 G05
Minimum Required Input Voltage
vs Output Voltage, IOUT = 2A
INPUT VOLTAGE (V)
0
0.01
10
1200
1000
12VIN
24VIN
36VIN
10
Input Current vs Output Current,
5VOUT
5.5VIN
12VIN
24VIN
36VIN
1200
0
20
8031 G02
Input Current vs Output Current,
3.3VOUT
1400
50
40
12VIN
24VIN
36VIN
10
8031 G01
1600
60
30
20
10
1
0.1
OUTPUT CURRENT (A)
60
30
5.5VIN
12VIN
24VIN
36VIN
20
EFFICIENCY (%)
90
80
EFFICIENCY (%)
EFFICIENCY (%)
100
3.0
0
500
1000
1500
LOAD CURRENT (mA)
2000
8032 G09
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LTM8032
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Minimum Required Input Voltage
vs Load Current, VOUT = 5V
Minimum Required Input Voltage
vs Load Current, VOUT = 8V
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
7.0
6.5
6.0
5.5
5.0
TO RUN
TO START
RUN/SS ENABLED
0
500
1500
1000
LOAD CURRENT (mA)
30
10.5
25
10.0
9.5
9.0
TO RUN
TO START
RUN/SS ENABLED
8.5
500
1000
1500
LOAD CURRENT (mA)
2400
2200
2000
35
1000
30
800
600
400
10
20
30
INPUT VOLTAGE (V)
35
20
15
5VIN
12VIN
24VIN
36VIN
1000
2000
1500
LOAD CURRENT (mA)
2500
8032 G16
500
1000
1500
2000
8032 G15
Temperature Rise vs
Load Current, VOUT = 8V
50
45
30
25
20
15
10
12VIN
24VIN
36VIN
5
0
2500
LOAD CURRENT (mA)
TEMPERATURE RISE (°C)
35
TEMPERATURE RISE (°C)
TEMPERATURE RISE (°C)
40
25
5VIN
12VIN
24VIN
36VIN
0
Temperature Rise vs
Load Current, VOUT = 5V
40
500
10
8032 G14
Temperature Rise vs
Load Current, VOUT = 3.3V
0
15
40
8032 G13
5
20
0
0
INPUT VOLTAGE (V)
10
25
5
0
40
30
2000
Temperature Rise vs
Load Current, VOUT = 2.5V
200
30
500
1000
1500
OUTPUT CURRENT (mA)
8032 G12
1200
1800
0
0
2000
TEMPERATURE RISE (°C)
2600
20
10
8032 G11
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
2800
10
15
Input Current vs Input Voltage
(Output Shorted)
3000
0
20
0
0
Output Current vs Input Voltage
(Output Shorted)
3200
3.3VOUT
5VOUT
8VOUT
5
8.0
2000
8032 G10
1600
Bias Current vs Output Current
11.0
BIAS CURRENT (mA)
7.5
0
500
1000
2000
1500
LOAD CURRENT (mA)
2500
8032 G17
40
35
30
25
20
15
10
12VIN
24VIN
36VIN
5
0
0
500
1500
2000
1000
LOAD CURRENT (mA)
2500
8032 G18
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LTM8032
EMISSIONS LEVEL (dBμV/m)
Temperature Rise vs
Load Current, VOUT = 10V
50
TEMPERATURE RISE (°C)
45
40
35
30
25
20
15
Radiated Emissions
90
70
50
30
10
–10
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
8031 G20
VIN = 36V
VOUT = 10V AT 2A
EMISSIONS LEVEL (dBμV/m)
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Radiated Emissions
90
70
50
30
10
–10
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
8031 G21
VIN = 13V
VOUT = 10V AT 2A
10
24VIN
36VIN
5
0
0
500
1500
2000
1000
LOAD CURRENT (mA)
2500
8032 G19
PIN FUNCTIONS
VIN (Bank 3): The VIN pin supplies current to the LTM8032’s
internal regulator and to the internal power switch. This
pin must be locally bypassed with an external, low ESR
capacitor of at least 2.2μF.
FIN (K3, L3): Filtered Input. This is the node after the input
EMI filter. Use this only if there is a need to modify the
behavior of the integrated EMI filter or if VIN rises or falls
rapidly; otherwise, leave these pins unconnected. See the
Applications Information section for more details.
GND (Bank 2): Tie these GND pins to a local ground plane
below the LTM8032 and the circuit components. Return
the feedback divider (RADJ) to this net.
VOUT (Bank 1): Power Output Pins. Apply the output filter
capacitor and the output load between these pins and
GND pins.
AUX (Pin H5): Low Current Voltage Source for BIAS. In
many designs, the BIAS pin is simply connected to VOUT.
The AUX pin is internally connected to VOUT and is placed
adjacent to the BIAS pin to ease printed circuit board routing. Although this pin is internally connected to VOUT, do
not connect this pin to the load. If this pin is not tied to
BIAS, leave it floating.
BIAS (Pin H4): The BIAS pin connects to the internal power
bus. Connect to a power source greater than 2.8V. If the
output is greater than 2.8V, connect this pin to AUX. If the
output voltage is less, connect this to a voltage source
between 2.8V and 25V. Also, make sure that BIAS + VIN
is less than 56V.
RUN/SS (Pin L5): Pull RUN/SS pin to less than 0.2V to
shut down the LTM8032. Tie to 2.5V or more for normal
operation. If the shutdown feature is not used, tie this pin
to the VIN pin. RUN/SS also provides a soft-start function;
see the Applications Information section.
RT (Pin G7): The RT pin is used to program the switching
frequency of the LTM8032 by connecting a resistor from
this pin to ground. The Applications Information section of
the data sheet includes a table to determine the resistance
value based on the desired switching frequency. Minimize
capacitance at this pin.
SHARE (Pin H7): Tie this to the SHARE pin of another
LTM8032 when paralleling the outputs. Otherwise, do
not connect.
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LTM8032
PIN FUNCTIONS
SYNC (Pin L6): This is the external clock synchronization
input. Ground this pin for low ripple Burst Mode® operation
at low output loads. Tie to a stable voltage source greater
than 0.7V to disable Burst Mode operation. Do not leave
this pin floating. Tie to a clock source for synchronization.
Clock edges should have rise and fall times faster than 1μs.
See synchronizing section in Applications Information.
ADJ (Pin J7): The LTM8032 regulates its ADJ pin to 0.79V.
Connect the adjust resistor from this pin to ground. The
value of RADJ is given by the equation:
R ADJ =
196.71
VOUT – 0.79
where RADJ is in kΩ.
PGOOD (Pin K7): The PGOOD pin is the open-collector
output of an internal comparator. PGOOD remains low until
the ADJ pin is within 10% of the final regulation voltage.
The PGOOD output is valid when VIN is above 3.6V and
RUN/SS is high. If this function is not used, leave this
pin floating.
Burst Mode is a registered trademark of Linear Technology Corporation.
BLOCK DIAGRAM
FIN
VIN
EMI FILTER
4.7μH
VOUT
249k
GND
10μF
AUX
GND
BIAS
SHARE
CURRENT
MODE
CONTROLLER
RUN/SS
SYNC
RT
PGOOD
ADJ
8032 BD
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LTM8032
OPERATION
The LTM8032 is a standalone nonisolated step-down
switching DC/DC power supply. It can deliver up to 2A of
DC output current with only bulk external input and output
capacitors. This module provides a precisely regulated
output voltage programmable via one external resistor
from 0.8VDC to 10VDC. The input voltage range is 3.6V
to 36V. Given that the LTM8032 is a step-down converter,
make sure that the input voltage is high enough to support
the desired output voltage and load current. A simplified
Block Diagram is given on the previous page.
The LTM8032 is designed with an input EMI filter and other
features to make its radiated emissions compliant with
several EMC specifications including EN55022 class B.
Compliance with conducted emissions requirements may
be obtained by adding a standard input filter.
The LTM8032 contains a current mode controller, power
switching element, power inductor, power Schottky diode
and a modest amount of input and output capacitance. The
LTM8032 is a fixed frequency PWM regulator. The switching frequency is set by simply connecting the appropriate
resistor value from the RT pin to GND.
An internal regulator provides power to the control circuitry.
The bias regulator can draw power from the VIN pin, but if
the BIAS pin is connected to an external voltage higher than
2.8V, bias power will be drawn from the external source
(typically the regulated output voltage). This improves
efficiency. The RUN/SS pin is used to place the LTM8032
in shutdown, disconnecting the output and reducing the
input current to less than 1μA.
To further optimize efficiency, the LTM8032 automatically
switches to Burst Mode operation in light load situations.
Between bursts, all circuitry associated with controlling the
output switch is shut down reducing the input supply current to 50μA in a typical application. The oscillator reduces
the LTM8032’s operating frequency when the voltage at the
ADJ pin is low. This frequency foldback helps to control
the output current during start-up and overload.
The LTM8032 contains a power good comparator which
trips when the ADJ pin is at 90% of its regulated value.
The PGOOD output is an open-collector transistor that is
off when the output is in regulation, allowing an external
resistor to pull the PGOOD pin high. Power good is valid
when the LTM8032 is enabled and VIN is above 3.6V.
APPLICATIONS INFORMATION
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 1 and find the row that has the desired
input range and output voltage.
2. Apply the recommended CIN, COUT, RADJ and RT
values.
3. Connect BIAS as indicated.
As the integrated input EMI filter may ring in response to an
application of a step input voltage, a bulk capacitance, series
resistance or some clamping mechanism may be required.
See the Hot-Plugging Safely section for details.
While these component combinations have been tested for
proper operation, it is incumbent upon the user to verify
proper operation over the intended system’s line, load and
environmental conditions.
Capacitor Selection Considerations
The CIN and COUT capacitor values in Table 1 are the
minimum recommended values for the associated operating conditions. Applying capacitor values below those
indicated in Table 1 is not recommended, and may result
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
it is necessary. Again, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions.
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable. X5R
and X7R types are stable over temperature and applied
voltage and give dependable service. Other types, including Y5V and Z5U have very large temperature and voltage
coefficients of capacitance. In an application circuit they
8032fa
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LTM8032
APPLICATIONS INFORMATION
Table 1: Recommended Component Values and Configuration
VIN
3.6V to 36V
3.6V to 36V
3.6V to 36V
3.6V to 36V
3.6V to 36V
3.6V to 36V
4.0V to 36V
4.3V to 36V
5.5V to 36V
7V to 36V
10.5V to 36V
3.6V to 15V
3.6V to 15V
3.6V to 15V
3.6V to 15V
3.6V to 15V
3.6V to 15V
4.0V to 15V
4.3V to 15V
5.5V to 15V
7V to 15V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
9V to 24V
10.5V to 24V
13V to 24V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
18V to 36V
VOUT
0.82V
1.00V
1.20V
1.50V
1.80V
2.00V
2.20V
2.50V
3.30V
5.00V
8.00V
0.82V
1.00V
1.20V
1.50V
1.80V
2.00V
2.20V
2.50V
3.30V
5.00V
0.82V
1.00V
1.20V
1.50V
1.80V
2.00V
2.20V
2.50V
3.30V
5.00V
8.00V
10.00V
0.82V
1.00V
1.20V
1.50V
1.80V
2.00V
2.20V
2.50V
3.30V
5.00V
8.00V
10.00V
CIN
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
2.2μF
COUT
200μF 1206
200μF 1206
147μF 1206
147μF 1206
100μF 1206
68μF 1206
68μF 1206
47μF 1206
22μF 1206
10μF 1206
10μF 1206
200μF 1206
200μF 1206
147μF 1206
147μF 1206
100μF 1206
68μF 1206
68μF 1206
47μF 1206
22μF 1206
10μF 1206
200μF 1206
200μF 1206
147μF 1206
147μF 1206
100μF 1206
68μF 1206
47μF 1206
22μF 1206
22μF 1206
10μF 1206
10μF 1206
10μF 1206
200μF 1206
200μF 1206
147μF 1206
147μF 1206
100μF 1206
68μF 1206
47μF 1206
22μF 1206
22μF 1206
10μF 1206
10μF 1206
10μF 1206
RADJ
5.62M
953k
487k
280k
196k
165k
140k
115k
78.7k
47.5k
27.4k
5.62M
953k
487k
280k
196k
165k
140k
115k
78.7k
47.5k
5.62M
953k
487k
280k
196k
165k
140k
115k
78.7k
47.5k
27.4k
21.5k
5.62M
953k
487k
280k
196k
165k
140k
115k
78.7k
47.5k
27.4k
21.5k
BIAS
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
AUX
AUX
AUX
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
AUX
AUX
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
AUX
AUX
AUX
AUX
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
≥2.8V, <25V
AUX
AUX
AUX
AUX
Note: An input bulk capacitor is required. 200μF is 2 × 100μF, 147 is 100μF||47μF
fOPTIMAL
250k
300k
350k
400k
450k
450k
500k
550k
600k
700k
800k
250k
300k
350k
400k
450k
450k
500k
550k
600k
700k
250k
300k
350k
400k
450k
450k
500k
550k
600k
700k
800k
900k
250k
300k
350k
400k
450k
450k
500k
550k
600k
700k
800k
900k
RT(OPTIMAL)
150k
124k
105k
88.7k
78.7k
78.7k
69.8k
61.9k
54.9k
44.2k
39.2k
150k
124k
105k
88.7k
78.7k
78.7k
69.8k
61.9k
54.9k
44.2k
150k
124k
105k
88.7k
78.7k
78.7k
69.8k
61.9k
54.9k
44.2k
39.2k
34.0k
150k
124k
105k
88.7k
78.7k
78.7k
69.8k
61.9k
54.9k
44.2k
39.2k
34.0k
fMAX
250k
300k
350k
400k
450k
450k
500k
600k
700k
1M
1.5M
600k
700k
800k
900k
1M
1.1M
1.25M
1.3M
1.7M
2M
400k
450k
500k
550k
650k
700k
750k
800k
1M
1.5M
1.5M
1.3M
250k
300k
350k
400k
450k
450k
500k
600k
700k
1M
1.5M
1.3M
RT(MIN)
150k
124k
105k
88.7k
78.7k
78.7k
69.8k
54.9k
44.2k
29.4k
16.2k
54.9k
44.2k
39.2k
34.0k
29.4k
26.1k
22.1k
21.0k
14.0k
10.0k
88.7k
79.0k
69.8k
61.9k
49.9k
44.2k
42.2k
39.2k
29.4k
16.2k
16.2k
21.0k
150k
124k
105k
88.7k
78.7k
78.7k
69.8k
54.9k
44.2k
29.4k
16.2k
21.0k
8032fa
9
LTM8032
APPLICATIONS INFORMATION
may have only a small fraction of their nominal capacitance resulting in much higher output voltage ripple than
expected. Ceramic capacitors are also piezoelectric. In
Burst Mode operation, the LTM8032’s switching frequency
depends on the load current, and can excite a ceramic
capacitor at audio frequencies, generating audible noise.
Since the LTM8032 operates at a lower current limit during
Burst Mode operation, the noise is typically very quiet to a
casual ear. If this audible noise is unacceptable, use a high
performance electrolytic capacitor at the output. The input
capacitor can be a parallel combination of a 2.2μF ceramic
capacitor and a low cost electrolytic capacitor.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8032. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8032 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possibly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safely section.
Electromagnetic Compliance
The LTM8032 is compliant with the radiated emissions
requirements of EN55022 class B. Graphs of the LTM8032’s
EMC performance are given in the Typical Performance
Characteristics section. Further data, operating conditions
and test setup are detailed in an EMI Test report available
from Linear Technology.
Frequency Selection
The LTM8032 uses a constant frequency PWM architecture
that can be programmed to switch from 200kHz to 2.4MHz
by using a resistor tied from the RT pin to ground. Table 2
provides a list of RT resistor values and their resultant
frequencies.
Operating Frequency Trade-Offs
It is recommended that the user apply the optimal RT
value given in Table 1 for the input and output operating
condition. System level or other considerations, however,
may necessitate another operating frequency. While the
LTM8032 is flexible enough to accommodate a wide range
Table 2. Switching Frequency vs RT Value
SWITCHING FREQUECNY (MHz)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.2
1.4
1.5
1.8
2
2.2
2.4
RT VALUE (kΩ)
187
124
88.7
69.8
54.9
44.2
39.2
34
29.4
23.7
19.1
16.2
13.3
11.5
9.76
8.66
of operating frequencies, a haphazardly chosen one may
result in undesirable operation under certain operating or
fault conditions. A frequency that is too high can reduce
efficiency, generate excessive heat or even damage the
LTM8032 if the output is overloaded or short-circuited.
A frequency that is too low can result in a final design
that has too much output ripple or too large of an output
cap. The maximum frequency (and attendant RT value) at
which the LTM8032 should be allowed to switch is given
in Table 1 in the fMAX column, while the recommended
frequency (and RT value) for optimal efficiency over the
given input condition is given in the fOPTIMAL column.
There are additional conditions that must be satisfied if
the synchronization function is used. Please refer to the
Synchronization section for details.
BIAS Pin Considerations
The BIAS pin is used to provide drive power for the internal
power switching stage and operate internal circuitry. For
proper operation, it must be powered by at least 2.8V. If
the output voltage is programmed to be 2.8V or higher,
simply tie BIAS to AUX. If VOUT is less than 2.8V, BIAS
can be tied to VIN or some other voltage source. In all
cases, ensure that the maximum voltage at the BIAS pin
is both less than 25V and the sum of VIN and BIAS is less
8032fa
10
LTM8032
APPLICATIONS INFORMATION
than 56V. If BIAS power is applied from a remote or noisy
voltage source, it may be necessary to apply a decoupling
capacitor locally to the LTM8032.
Burst Mode Operation
To enhance efficiency at light loads, the LTM8032 automatically switches to Burst Mode operation which keeps
the output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst Mode
operation, the LTM8032 delivers single cycle bursts of
current to the output capacitor followed by sleep periods
where the output power is delivered to the load by the output
capacitor. In addition, VIN and BIAS quiescent currents are
reduced to typically 20μA and 50μA respectively during
the sleep time. As the load current decreases towards a
no-load condition, the percentage of time that the LTM8032
operates in sleep mode increases and the average input
current is greatly reduced, resulting in higher efficiency.
Burst Mode operation is enabled by tying SYNC to GND. To
disable Burst Mode operation, tie SYNC to a stable voltage
above 0.7V. Do not leave the SYNC pin floating.
Minimum Input Voltage
The LTM8032 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. In addition, the input voltage required to turn
on is higher than that required to run, and depends upon
whether the RUN/SS is used. As shown in Figure 1, it
takes only about 3.6VIN for the LTM8032 to run a 3.3V
output at light load. If RUN/SS is pulled up to VIN, it takes
INPUT VOLTAGE (V)
Two or more LTM8032s may be paralleled to produce higher
currents. This may, however, alter the EMI performance of
the LTM8032s. To do this, tie the VIN, ADJ, VOUT and SHARE
pins of all the paralleled LTM8032s together. To ensure that
paralleled modules start up together, the RUN/SS pins may
be tied together, as well. Synchronize the LTM8032s to an
external clock to eliminate beat frequencies, if required. If
the RUN/SS pins are not tied together, make sure that the
same valued soft-start capacitors are used for each module.
An example of two LTM8032 modules configured for load
sharing is given in the Typical Applications section.
VOUT = 3.3V
5.5
5.0
4.5
4.0
TO RUN
TO START
RUN/SS ENABLED
3.5
3.0
0
500
1000
1500
LOAD CURRENT (mA)
2000
8032 F01a
7.5
VOUT = 5V
7.0
INPUT VOLTAGE (V)
Load Sharing
6.0
6.5
6.0
5.5
5.0
TO RUN
TO START
RUN/SS ENABLED
0
500
1500
1000
LOAD CURRENT (mA)
2000
8032 F01b
Figure 1. The LTM8032 Needs More Voltage to Start Than Run
5.5VIN to start. If the LTM8032 is enabled via the RUN/SS
pin, the minimum voltage to start at light loads is lower,
about 4.5V. A similar curve for 5VOUT operation is also
provided in Figure 1.
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8032,
reducing the maximum input current during start-up. The
RUN/SS pin is driven through an external RC network to
create a voltage ramp at this pin. Figure 2 shows the startup and shutdown waveforms with the soft-start circuit. By
choosing an appropriate RC time constant, the peak start-up
current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply at least 20μA when
the RUN/SS pin reaches 2.5V.
8032fa
11
LTM8032
APPLICATIONS INFORMATION
VIN
15k
RUN/SS
VOUT
2V/DIV
2ms/DIV
8023 F02
Figure 2. To Soft-Start the LTM8032, Add a Resistor
and Capacitor to the RUN/SS Pin
Synchronization
The internal oscillator of the LTM8032 can be synchronized by applying an external 250kHz to 2MHz clock to
the SYNC pin. Do not leave this pin floating. The resistor
tied from the RT pin to ground should be chosen such
that the LTM8032 oscillates 20% lower than the intended
synchronization frequency (see the Frequency Selection
section). The LTM8032 will not enter Burst Mode operation
while synchronized to an external clock, but will instead
skip pulses to maintain regulation.
Shorted Input Protection
Care needs to be taken in systems where the output will
be held high when the input to the LTM8032 is absent.
This may occur in battery charging applications or in
battery back-up systems where a battery or some other
supply is diode ORed with the LTM8032’s output. If the
VIN pin is allowed to float and the RUN/SS pin is held high
(either by a logic signal or because it is tied to VIN), then
the LTM8032’s internal circuitry will pull its quiescent
current through its internal power switch. This is fine if
your system can tolerate a few milliamps in this state. If
you ground the RUN/SS pin, the internal switch current
will drop to essentially zero. However, if the VIN pin is
grounded while the output is held high, then parasitic
diodes inside the LTM8032 can pull large currents from
the output through the VIN pin, potentially damaging the
device. Figure 3 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
VOUT
ADJ
RT SYNC GND
VRUN/SS
2V/DIV
GND
0.22μF
VOUT
RUN/SS
AUX
LTM8032
BIAS
IL
1A/DIV
RUN
VIN
8032 F03
Figure 3. The Input Diode Prevents a Shorted Input from
Discharging a Back-Up Battery Tied to the Output. It Also
Protects the Circuit from a Reversed Input. The LTM8032
Runs Only When the Input is Present
PCB Layout
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
integration of the LTM8032. The LTM8032 is nevertheless a switching power supply and care must be taken to
minimize EMI and ensure proper operation. Even with the
high level of integration, you may fail to achieve specified
operation with a haphazard or poor layout. See Figure 4
for a suggested layout.
Ensure that the grounding and heat sinking are acceptable.
A few rules to keep in mind are:
1. Place the RADJ and RT resistors as close as possible to
their respective pins.
2. Place the CIN capacitor as close as possible to the VIN
and GND connection of the LTM8032. If a capacitor
is connected to the FIN terminals, place it as close
as possible to the FIN terminals, such that its ground
connection is as close as possible to that of the CIN
capacitor.
3. Place the COUT capacitor as close as possible to the
VOUT and GND connection of the LTM8032.
4. Place the CIN and COUT capacitors such that their
ground currents flow directly adjacent or underneath
the LTM8032.
5. Connect all of the GND connections to as large a copper
pour or plane area as possible on the top layer. Avoid
breaking the ground connection between the external
components and the LTM8032.
8032fa
12
LTM8032
PGOOD
RT
GND
RADJ
APPLICATIONS INFORMATION
COUT
SYNC
AUX
BIAS
RUN/SS
FIN
VIN
OPTIONAL
FIN
CAPACITOR
VOUT
CIN
GND
8032 F04
Figure 4. Layout Showing Suggested External Components,
GND Plane and Thermal Vias
6. Use vias to connect the GND copper area to the board’s
internal ground plane. Liberally distribute these GND vias
to provide both a good ground connection and thermal
path to the internal planes of the printed circuit board.
If the input supply is poorly controlled or the user will
be plugging the LTM8032 into an energized supply, the
input network should be designed to prevent this overshoot. Figure 5 shows the waveforms that result when
an LTM8032 circuit is connected to a 24V supply through
six feet of 24-gauge twisted pair. The first plot (5a) is the
response with a 2.2μF ceramic capacitor at the input. The
input voltage rings as high as 35V and the input current
peaks at 20A. One method of damping the tank circuit
is to add another capacitor with a series resistor to the
circuit. An alternative solution is shown in Figure 5b. A
0.7Ω resistor is added in series with the input to eliminate
the voltage overshoot (it also reduces the peak input current). A 0.1μF capacitor improves high frequency filtering.
For high input voltages its impact on efficiency is minor,
reducing efficiency less than one-half percent for a 5V
output at full load operating from 24V. By far the most
popular method of controlling overshoot is shown in Figure
5c, where an aluminum electrolytic capacitor has been
connected to FIN. This capacitor’s high equivalent series
resistance damps the circuit and eliminates the voltage
overshoot. The extra capacitor improves low frequency
ripple filtering and can slightly improve the efficiency of
the circuit, though it is likely to be the largest component
in the circuit. Figure 5c shows the capacitor added to the
VIN terminals, but placing the electrolytic capacitor at the
FIN terminals can improve the LTM8032’s EMI filtering as
well as guard against overshoots caused by the Q of the
integrated filter.
Hot-Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LTM8032. However, these capacitors
can cause problems if the LTM8032 is plugged into a live
or fast rising or falling supply (see Linear Technology
Application Note 88 for a complete discussion). The low
loss ceramic capacitor combined with stray inductance in
series with the power source forms an under-damped tank
circuit, and the voltage at the VIN pin of the LTM8032 can
ring to twice the nominal input voltage, possibly exceeding the LTM8032’s rating and damaging the part. A similar
phenomenon can occur inside the LTM8032 module, at the
output of the integrated EMI filter, with the same potential
of damaging the part.
Thermal Considerations
The LTM8032 output current may need to be derated if it
is required to operate in a high ambient temperature or
deliver a large amount of continuous power. The amount of
current derating is dependent upon the input voltage, output power and ambient temperature. The derating curves
given in the Typical Performance Characteristics section
can be used as a guide. These curves were generated by a
LTM8032 mounted to a 36cm2 4-layer FR4 printed circuit
board. Boards of other sizes and layer count can exhibit
different thermal behavior, so it is incumbent upon the user
to verify proper operation over the intended system’s line,
load and environmental operating conditions.
8032fa
13
LTM8032
APPLICATIONS INFORMATION
CLOSING SWITCH
SIMULATES HOT PLUG
IIN
DANGER
LTM8032
VIN
VIN
20V/DIV
RINGING VIN MAY EXCEED
ABSOLUTE MAXIMUM RATING
+
4.7μF
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
IIN
10A/DIV
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
20μs/DIV
(5a)
0.7Ω
LTM8032
VIN
VIN
20V/DIV
+
0.1μF
4.7μF
IIN
10A/DIV
(5b)
FIN
LTM8032
VIN
+
22μF
35V
AI.EI.
20μs/DIV
VIN
20V/DIV
+
4.7μF
IIN
10A/DIV
(5c)
20μs/DIV
8032 F05
Figure 5. A Well Chosen Input Network Prevents Input Voltage Overshoot and Ensures
Reliable Operation When the LTM8032 is Hot-Plugged to a Live Supply
The die temperature of the LTM8032 must be lower than
the maximum rating of 125°C, so care should be taken
in the layout of the circuit to ensure good heat sinking
of the LTM8032. To estimate the junction temperature,
approximate the power dissipation within the LTM8032 by
applying the typical efficiency stated in this data sheet to
the desired output power, or, if you have an actual module,
by taking a power measurement. Then calculate the temperature rise of the LTM8032 junction above the surface
of the printed circuit board by multiplying the module’s
power dissipation by the thermal resistance. The actual
thermal resistance of the LTM8032 to the printed circuit
board depends upon the layout of the circuit board, but
the thermal resistance given in the Pin Configuration,
as well as the internal temperature rise curves given in
the Typical Performance Characteristics section, can be
used a guide. Both the thermal resistance and internal
temperature rise curves are based upon a 36cm2 4-layer
FR4 PC board.
Finally, be aware that at high ambient temperatures the
internal Schottky diode will have significant leakage current,
increasing the input quiescent current of the LTM8032.
8032fa
14
LTM8032
TYPICAL APPLICATIONS
0.82V Step-Down Converter
VIN*
3.6VDC TO 24VDC
OUT
VIN
2.2μF
FIN
LTM8032
VOUT
0.82V
200μF 2A
AUX
RUN/SS
BIAS
SHARE
PGOOD
RT SYNC GND ADJ
5.62M
150k
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
8032 TA02
1.8V Step-Down Converter
VIN*
3.6VDC TO 24VDC
OUT
VIN
2.2μF
FIN
LTM8032
RUN/SS
VOUT
1.8V
100μF 2A
AUX
BIAS
SHARE
PGOOD
RT SYNC GND ADJ
78.7k
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
196k
8032 TA03
8032fa
15
LTM8032
TYPICAL APPLICATIONS
2.5V Step-Down Converter
VIN*
4.3VDC TO 36VDC
2.2μF
LTM8032
FIN
22μF
VOUT
3.3V
2A
AUX
RUN/SS
3.3V
47μF
VOUT
2.5V
2A
OUT
VIN
BIAS
SHARE
PGOOD
RT SYNC GND ADJ
115k
61.9k
8032 TA04
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
3.3V Step-Down Converter
VIN*
5.5VDC TO 36VDC
OUT
VIN
FIN
RUN/SS
2.2μF
AUX
LTM8032 BIAS
SHARE
PGOOD
RT SYNC GND ADJ
54.9k
78.7k
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
8032 TA08
5V Step-Down Converter
VIN*
7VDC TO 36VDC
OUT
VIN
10μF
FIN
RUN/SS
2.2μF
VOUT
5V
2A
AUX
LTM8032 BIAS
SHARE
PGOOD
RT SYNC GND ADJ
44.2k
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
47.5k
8032 TA05
8032fa
16
LTM8032
TYPICAL APPLICATIONS
8V Step-Down Converter
VIN*
10.5VDC TO 36VDC
VOUT
8V
2A
OUT
VIN
10μF
FIN
AUX
RUN/SS
2.2μF
LTM8032 BIAS
SHARE
PGOOD
RT SYNC GND ADJ
39.2k
27.4k
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
8032 TA06
Two LTM8032s Operating in Parallel
VIN*
5.5VDC TO 36VDC
VOUT
3.3V
3.5A
OUT
VIN
FIN
RUN/SS
AUX
LTM8032 BIAS
2.2μF
SHARE
PGOOD
RT SYNC GND ADJ
54.9k
40k
OPTIONAL SYNC TIE TO
GND IF NOT USED
OUT
VIN
47μF
FIN
RUN/SS
AUX
LTM8032 BIAS
2.2μF
SHARE
PGOOD
RT SYNC GND ADJ
8032 TA07
54.9k
*RUNNING VOLTAGE RANGE.
SEE APPLICATIONS FOR START-UP DETAILS
8032fa
17
LTM8032
PACKAGE DESCRIPTION
LGA Package
71-Lead (15mm × 9mm × 2.82mm)
(Reference LTC DWG # 05-08-1823 Rev Ø)
2.670 – 2.970
7
aaa Z
6
5
4
3
2
1
PAD 1
Ø (0.635)
A
PAD 1
CORNER
B
4
C
D
E
15.00
BSC
12.700
BSC
F
G
H
MOLD
CAP
SUBSTRATE
J
0.27 – 0.37
K
1.270
BSC
Z
bbb Z
2.40 – 2.60
DETAIL A
L
PADS
SEE NOTES
X
aaa Z
9.00
BSC
Y
DETAIL A
PACKAGE SIDE VIEW
PACKAGE TOP VIEW
3
1.27
BSC
7.620
BSC
DETAIL A
PACKAGE BOTTOM VIEW
0.635 ±0.025 SQ. 71x
3.810
2.540
1.270
0.000
1.270
2.540
3.810
eee S X Y
6.350
DETAIL A
5.080
3.810
2.540
1.270
0.000
1.270
2.540
3.810
5.080
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994
2. ALL DIMENSIONS ARE IN MILLIMETERS
3
LAND DESIGNATION PER JESD MO-222, SPP-010 AND SPP-020
4
DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.
THE PAD #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE
LTMXXXXXX
μModule
COMPONENT
PIN 1
TRAY PIN 1
BEVEL
PACKAGE IN TRAY LOADING ORIENTATION
LGA 71 0108 REV Ø
5. PRIMARY DATUM -Z- IS SEATING PLANE
6. THE TOTAL NUMBER OF PADS: 71
SYMBOL TOLERANCE
aaa
0.15
bbb
0.10
eee
0.05
6.350
SUGGESTED PCB LAYOUT
TOP VIEW
8032fa
18
LTM8032
PACKAGE DESCRIPTION
Table 2. LTM8032 Pinout (Sorted by Pin Number)
PIN
SIGNAL DESCRIPTION
PIN
SIGNAL DESCRIPTION
A1
VOUT
F1
GND
A2
VOUT
F2
GND
A3
VOUT
F3
GND
A4
VOUT
F4
GND
A5
GND
F5
GND
A6
GND
F6
GND
A7
GND
F7
GND
B1
VOUT
G1
GND
B2
VOUT
G2
GND
B3
VOUT
G3
GND
B4
VOUT
G4
GND
B5
GND
G5
GND
B6
GND
G6
GND
B7
GND
G7
RT
C1
VOUT
H1
GND
C2
VOUT
H2
GND
C3
VOUT
H3
GND
C4
VOUT
H4
BIAS
C5
GND
H5
AUX
C6
GND
H6
GND
C7
GND
H7
SHARE
D1
VOUT
J5
GND
D2
VOUT
J6
GND
D3
VOUT
J7
ADJ
D4
VOUT
K1
VIN
D5
GND
K2
VIN
D6
GND
K3
FIN
D7
GND
K5
GND
E1
GND
K6
GND
E2
GND
K7
PGOOD
E3
GND
L1
VIN
E4
GND
L2
VIN
E5
GND
L3
FIN
E6
GND
L5
RUN/SS
E7
GND
L6
SYNC
L7
GND
8032fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LTM8032
PACKAGE PHOTOGRAPH
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTM4606
Ultralow Noise 6A DC/DC μModule
4.5V ≤ VIN ≤ 28V, 0.6V ≤ VOUT ≤ 5V, 15mm × 15mm × 2.8mm Package
LTM4612
Ultralow Noise High VOUT DC/DC μModule
5A, 5V ≤ VIN ≤ 36V, 3.3V ≤ VOUT ≤ 15V, 15mm × 15mm × 2.8mm Package
LTM8023
36V, 2A DC/DC μModule
3.6V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, 9mm × 11.75mm × 2.8mm Package
8032fa
20 Linear Technology Corporation
LT 0409 REV A • PRINTED IN USA
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© LINEAR TECHNOLOGY CORPORATION 2009
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