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LT3570IFE-PBF

更新时间： 2024-11-13 11:54:23
品牌 Logo 应用领域
凌特 - Linear 转换器控制器
页数 文件大小 规格书
20页 283K
描述
1.5A Buck Converter, 1.5A Boost Converter and LDO Controller

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LT3570IFE-PBF 数据手册

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LT3570  
1.5A Buck Converter,  
1.5A Boost Converter and  
LDO Controller  
FEATURES  
DESCRIPTION  
n
2.5V to 36V Input Voltage Range  
The LT®3570 is a buck and boost converter with internal  
power switches and LDO controller. Each converter is  
designed with a 1.5A current limit and an input range  
from 2.5V to 36V, making the LT3570 ideal for a wide  
variety of applications. Switching frequencies up to 2MHz  
are programmed with an external timing resistor and the  
oscillator can be synchronized to an external clock up to  
2.75MHz.  
n
Programmable Switching Frequency  
from 500kHz to 2MHz  
n
Synchronizable Up to 2.75MHz  
n
V
: 0.8V  
OUT(MIN)  
n
n
n
n
Independent Soft-Start for Each Converter  
Separate V Supplies for Each Converter  
IN  
Duty Cycle Range: 0% to 90% at 1MHz  
Available in 24-Lead (4mm × 4mm) QFN and  
20-Lead TSSOP Packages  
The LT3570 features a programmable soft-start function  
that limits the feedback voltage during start-up helping  
prevent overshoot and limiting inrush current. The LDO  
controller is capable of delivering up to 10mA of base  
current to an external NPN transistor.  
APPLICATIONS  
n
Cable and Satellite Set-Top Boxes  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
Automotive Systems  
n
Telecom Systems  
n
“Dying Gasp” Systems  
n
TFT LCD Displays  
TYPICAL APPLICATION  
V
IN  
5V  
10μF  
V
V
V
BIAS  
IN1 IN2 IN3  
D3  
Efficiency  
SHDN1  
SHDN2  
SHDN3  
SHDN1  
SHDN2  
SHDN3  
BOOST  
100  
100nF  
V
3.3V  
1A  
OUT2  
SW2  
3.3μH  
95  
D2  
32.4k  
6.8μH  
D1  
V
OUT1  
12V  
275mA  
90  
85  
SW1  
FB2  
SS2  
22μF  
143k  
V
C2  
LT3570  
f
= 1.2MHz  
= 5V  
10μF  
SW  
IN  
10.2k  
FB1  
SS1  
22k  
1nF  
10nF  
V
V
V
V
80  
75  
70  
= 12V  
10.0k  
OUT1  
OUT2  
OUT3  
OUT1  
OUT3  
V
C1  
= 3.3V  
= 2.5V  
22k  
1nF  
I
I
= 275mA  
= 100mA  
NPN_DRV  
Q1  
V
OUT3  
2.5V  
0
0.2  
0.4  
I
OUT2  
0.6  
(A)  
0.8  
1.0  
10nF  
100mA  
22.1k  
3570 TA01b  
FB3  
2.2μF  
R
T
SYNC  
15.8k  
GND  
10.2k  
3570 TA01a  
3570fa  
1
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