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LTM8045_15

Description
Inverting or SEPIC Module DC/DC Converter with Up to 700mA Output Current
File Size277KB,22 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTM8045_15 Overview

Inverting or SEPIC Module DC/DC Converter with Up to 700mA Output Current

FEATURES
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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.
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SEPIC or Inverting Topology
Wide Input Voltage Range: 2.8V to 18V
Up to 700mA Output Current at V
IN
= 12V,
V
OUT
= 2.5V or –2.5V
Up to 375mA Output Current at V
IN
= 12V,
V
OUT
=15V or –15V
2.5V to 15V or –2.5V to –15V Output Voltage
Selectable Switching Frequency: 200kHz to 2MHz
Programmable Soft-Start
User Configurable Undervoltage Lockout
6.25mm × 11.25mm × 4.92mm BGA Package
APPLICATIONS
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Battery Powered Regulator
Local Negative Voltage Regulator
Low Noise Amplifier Power
TYPICAL APPLICATION
Use Two LTM8045s to Generate ±5V
LTM8045
V
IN
2.8VDC TO 18VDC
4.7µF
V
IN
V
OUT
V
OUT
–5V
60.4k
OUTPUT CURRENT (mA)
FB
GND
V
OUT
+
22µF
Maximum Output Current
vs Input Voltage
800
700
600
500
400
300
200
100
2
4
6
±2.5V
OUT
±3.3V
OUT
±5V
OUT
±8V
OUT
±12V
OUT
±15V
OUT
8
10 12 14
INPUT VOLTAGE (V)
16
18
RUN
SS
RT
130k
SYNC
LTM8045
V
IN
V
OUT
RUN
SS
RT
115k
SYNC
GND
For more information
www.linear.com/LTM8045
FB
V
OUT
+
8045 TA01b
100µF
45.3k
V
OUT
5V
8045 TA01b
8045fb
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