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LT3479_15

Description
3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection
File Size243KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LT3479_15 Overview

3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection

LT3479
3A, Full Featured DC/DC
Converter with Soft-Start
and Inrush Current Protection
FEATURES
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DESCRIPTION
The LT
®
3479 is a current mode, fixed frequency step-up
DC/DC converter with an internal 3A, 42V switch. Efficien-
cies of up to 89% can be achieved in typical applications. It
features a programmable soft-start function to limit induc-
tor current during start-up and inrush current protection
to protect the LT3479 during shorts and line transients.
Both inputs of the error amplifier are available to the user
allowing positive and negative output voltages. Through
an external resistor, the user can program the switch-
ing frequency from 200kHz to 3.5MHz. The low profile
(0.75mm) 14-pin, 4mm
×
3mm DFN package provides
excellent thermal performance in a small footprint. The
LT3479 is also available in a thermally enhanced 16-pin
TSSOP package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Wide Input Voltage Range: 2.5V to 24V
3A, 42V Internal Switch
High Efficiency Power Conversion: Up to 89%
Soft-Start
Frequency Set by External Resistor: 200kHz to
3.5MHz
Protection Against Input Short Circuits and
Hot Plugging
Low V
CESAT
Switch: 0.3V at 2.5A (Typical)
Capable of Positive and Negative Outputs
Available in Thermally Enhanced 14-Lead
(4mm
×
3mm) DFN and 16-Lead TSSOP Packages
APPLICATIONS
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High Power LED Driver
DSL Modems
Distributed Power
TYPICAL APPLICATION
5V to 12V Boost Converter
4.7μH
V
IN
5V
2.2μF
V
IN
V
S
L
SHDN
LT3479
SS
10nF
R
T
GND
17.8k
FBP
V
C
10k
2.2nF
3479 TA01
5V to 12V Efficiency
V
OUT
12V
0.8A
90
85
EFFICIENCY (%)
80
75
70
65
60
200k
SW
FBN
23.2k
V
REF
10μF
0
0.2
0.4
I
OUT
(A)
0.6
0.8
3479 TA02
3479fc
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