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PDF LTM8045 Data sheet ( Hoja de datos )
| Número de pieza | LTM8045 | |
| Descripción | Inverting or SEPIC uModule DC/DC Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8045 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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FEATURES
n SEPIC or Inverting Topology
n Wide Input Voltage Range: 2.8V to 18V
n Up to 700mA Output Current at VIN = 12V,
VOUT = 2.5V or –2.5V
n Up to 375mA Output Current at VIN = 12V,
VOUT =15V or –15V
n 2.5V to 15V or –2.5V to –15V Output Voltage
n Selectable Switching Frequency: 200kHz to 2MHz
n Programmable Soft-Start
n User Configurable Undervoltage Lockout
n 6.25mm × 11.25mm × 4.92mm BGA Package
APPLICATIONS
n Battery Powered Regulator
n Local Negative Voltage Regulator
n Low Noise Amplifier Power
LTM8045
Inverting or SEPIC µModule
DC/DC Converter with Up
to 700mA Output Current
DESCRIPTION
The LTM®8045 is a µModule® (micromodule) DC/DC
converter that can be configured as a SEPIC or inverting
converter by simply grounding the appropriate output rail.
In a SEPIC configuration the regulated output voltage can
be above, below or equal to the input voltage. The LTM8045
includes power devices, inductors, control circuitry and
passive components. All that is needed to complete the
design are input and output capacitors, and small resis-
tors to set the output voltage and switching frequency.
Other components may be used to control the soft-start
and undervoltage lockout.
The LTM8045 is packaged in a compact (6.25mm ×
11.25mm) overmolded ball grid array (BGA) package suit-
able for automated assembly by standard surface mount
equipment. The LTM8045 is available with SnPb (BGA)
or RoHS compliant terminal finish.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
Use Two LTM8045s to Generate ±5V
VIN
2.8VDC TO 18VDC
4.7µF
130k
VIN
RUN
SS
RT
SYNC
LTM8045
GND
VOUT–
FB
VOUT+
60.4k
VOUT
–5V
22µF
115k
VIN
RUN
SS
RT
SYNC
LTM8045
GND
VOUT–
FB
VOUT+
8045 TA01b
45.3k
100µF
VOUT
5V
Maximum Output Current
vs Input Voltage
800
700
600
500
400
±2.5VOUT
300 ±3.3VOUT
±5VOUT
200
±8VOUT
±12VOUT
100 ±15VOUT
2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
8045 TA01b
For more information www.linear.com/LTM8045
8045fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTM8045
Efficiency
–8VOUT Inverting Converter
90
80
70
60
50
40
30
20
3.3VIN
5VIN
10 12VIN
18VIN
0
0 100 200 300 400 500 600
OUTPUT CURRENT (mA)
8045 G10
Input Current vs Output Current,
2.5VOUT SEPIC
600
3.3VIN
500
5VIN
12VIN
18VIN
400
300
200
100
0
0 100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G13
Input Current vs Output Current,
8VOUT SEPIC
900
3.3VIN
800 5VIN
700
12VIN
18VIN
600
500
400
300
200
100
0
0 100 200 300 400 500 600
OUTPUT CURRENT (mA)
8045 G16
Efficiency
–12VOUT Inverting Converter
90
80
70
60
50
40
30
20
3.3VIN
5VIN
10 12VIN
18VIN
0
0 100 200 300 400 500
OUTPUT CURRENT (mA)
8045 G11
Input Current vs Output Current,
3.3VOUT SEPIC
700
3.3VIN
600
5VIN
12VIN
500 18VIN
400
300
200
100
0
0 100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
8045 G14
Input Current vs Output Current,
12VOUT SEPIC
1000
900
800
3.3VIN
5VIN
12VIN
18VIN
700
600
500
400
300
200
100
0
0 100 200 300 400 500
OUTPUT CURRENT (mA)
8045 G17
For more information www.linear.com/LTM8045
Efficiency
–15VOUT Inverting Converter
90
80
70
60
50
40
30
20
5VIN
10 12VIN
0 18VIN
0 100 200 300 400 500
OUTPUT CURRENT (mA)
8045 G12
Input Current vs Output Current,
5VOUT SEPIC
800
3.3VIN
700
5VIN
12VIN
600 18VIN
500
400
300
200
100
0
0 100 200 300 400 500 600 700
OUTPUT CURRENT (mA)
8045 G15
Input Current vs Output Current,
15VOUT SEPIC
900
5VIN
800 12VIN
700 18VIN
600
500
400
300
200
100
0
0 100 200 300 400 500
OUTPUT CURRENT (mA)
8045 G18
8045fb
5
5 Page 
LTM8045
OPERATION
The LTM8045 is a stand-alone switching DC/DC converter
that may be configured either as a SEPIC (single-ended
primary inductance converter) or inverting power supply
simply by tying VOUT– or VOUT+ to GND, respectively.
It accepts an input voltage up to 18VDC. The output is
adjustable between 2.5V and 15V for the SEPIC, and
between –2.5V and –15V for the inverting configuration.
The LTM8045 can provide 700mA at VIN = 12V when VOUT
= 2.5V or –2.5V.
As shown in the Block Diagram, the LTM8045 contains a
current mode controller, power switching element, power
coupled inductor, power Schottky diode and a modest
amount of input and output capacitance. The LTM8045
is a fixed frequency PWM converter.
The LTM8045 switching can free run by applying a resis-
tor to the RT pin or synchronize to an external source at
a frequency between 200kHz and 2MHz. To synchronize
to an external source, drive a valid signal source into the
SYNC pin. An RT resistor is required whether or not a
SYNC signal is applied. See the Applications Information
section for more details.
The LTM8045 also features RUN and SS pins to control
the start-up behavior of the device. The RUN pin may also
be used to implement an accurate undervoltage lockout
function by applying just one or two resistors.
The LTM8045 is equipped with a thermal shutdown to
protect the device during momentary overload conditions.
It is set above the 125°C absolute maximum internal tem-
perature rating to avoid interfering with normal specified
operation, so internal device temperatures will exceed
the absolute maximum rating when the overtemperature
protection is active. Therefore, continuous or repeated
activation of the thermal shutdown may impair device
reliability.
For more information www.linear.com/LTM8045
8045fb
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LTM8045.PDF ] | |
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