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LT3579_15

更新时间： 2024-11-14 01:22:55
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
42页 580K
描述
6A Boost/Inverting DC/DC Converter with Fault Protection

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LT3579_15 数据手册

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LT3579/LT3579-1  
6A Boost/Inverting  
DC/DC Converter with Fault Protection  
FEATURES  
DESCRIPTION  
The LT®3579 is a PWM DC/DC converter with built-in fault  
protectionfeaturestoaidinprotectingagainstoutputshorts,  
input/outputovervoltage,andovertemperatureconditions.  
The part consists of a 42V master switch, and a 42V slave  
switchthatcanbetiedtogetherforatotalcurrentlimitof6A.  
n
6A, 42V Combined Power Switch  
n
n
Output Short Circuit Protection  
Wide Input Range: 2.5V to 16V Operating,  
40V Maximum Transient  
LT3579-1: Dual-Phase Capable  
n
n
n
n
Master/Slave (3.4A/2.6A) Switch Design  
User Configurable Undervoltage Lockout  
Easily Configurable as a Boost, SEPIC, Inverting, or  
Flyback Converter  
The LT3579 is ideal for many local power supply designs. It  
canbeeasilyconfiguredinBoost,SEPIC,Inverting,orFlyback  
configurations, and is capable of generating 12V at 1.7A, or  
–12Vat1.2Afroma5Vinput. Inaddition, theLT3579’sslave  
switch allows the part to be configured in high voltage, high  
power charge pump topologies that are very efficient and  
require fewer components than traditional circuits.  
n
n
n
n
Low V  
Switch: 250mV at 5.5A (Typical)  
CESAT  
Can Be Synchronized to External Clock  
Can Synchronize other Switching Regulators  
High Gain SHDN Pin Accepts Slowly Varying Input  
Signals  
TheLT3579’sswitchingfrequencyrangecanbesetbetween  
200kHz and 2.5MHz. The part may be clocked internally at  
a frequency set by the resistor from the RT pin to ground,  
or it may be synchronized to an external clock. A buffered  
version of the clock signal is driven out of the CLKOUT  
pin, and may be used to synchronize other compatible  
switching regulator ICs to the LT3579.  
n
20-Lead TSSOP and 20-Pin 4mm × 5mm QFN  
Packages  
APPLICATIONS  
n
Local Power Supply  
n
Vacuum Fluorescent Display (VFD) Bias Supplies  
TheLT3579alsofeaturesinnovativeSHDNpincircuitrythat  
allows for slowly varying input signals and an adjustable  
undervoltage lockout function. Additional features such  
as frequency foldback and soft-start are integrated. The  
LT3579 is available in 20-lead TSSOP and 20-pin 4mm ×  
5mm QFN packages.  
n
TFT-LCD Bias Supplies  
Automotive Engine Control Unit (ECU) Power  
n
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.  
Protected by U.S. Patents, including 7579816.  
TYPICAL APPLICATION  
Efficiency and Power Loss  
100  
90  
80  
70  
60  
50  
40  
30  
20  
3.2  
2.8  
2.4  
2.0  
1.6  
1.2  
0.8  
0.4  
0
1MHz, 5V to 12V Boost Converter with Output Short Circuit Protection  
2.2µH  
V
12V  
1.7A  
OUT  
V
5V  
IN  
10µF  
SW1 SW2  
130k 6.3k  
10µF  
FB  
GATE  
V
IN  
22µF  
100k  
200k  
FAULT  
V
IN  
LT3579  
TEMPERATURE  
MONITOR  
SHDN  
CLKOUT  
V
C
RT  
8k  
2.2nF  
SYNC GND SS  
86.6k  
0.1µF  
47pF  
0
0.25 0.5 0.75  
1
1.25 1.5 1.75  
2
35791 TA01  
LOAD CURRENT (A)  
35791 TA02  
35791fa  
1
For more information www.linear.com/LT3579  
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