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LT1676

更新时间： 2024-11-17 22:51:47
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
16页 139K
描述
Wide Input Range, High Efficiency, Step-Down Switching Regulator

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中文翻译

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LT1676 数据手册

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LT1676  
Wid e Inp ut Ra ng e ,  
Hig h Effic ie nc y, Ste p -Do wn  
Switc hing Re g ula to r  
U
FEATURES  
DESCRIPTIO  
The LT®1676 is a wide input range, high efficiency Buck  
(step-down) switching regulator. The monolithic die in-  
cludes all oscillator, control and protection circuitry. The  
part can accept input voltages as high as 60V and contains  
an output switch rated at 700mA peak current. Current  
mode control offers excellent dynamic input supply rejec-  
tion and short-circuit protection.  
■
Wide Input Range: 7.4V to 60V  
700mA Peak Switch Current Rating  
Adaptive Switch Drive Maintains Efficiency at High  
Load Without Pulse Skipping at Light Load  
True Current Mode Control  
100kHz Fixed Operating Frequency  
Synchronizable to 250kHz  
Low Supply Current in Shutdown: 30µA  
■
■
■
■
■
■
The LT1676 contains several features to enhance effi-  
ciency. The internal control circuitry is normally powered  
via the VCC pin, thereby minimizing power drawn directly  
■
Available in 8-Pin SO and PDIP Packages  
U
from the V supply (see Applications Information). The  
IN  
APPLICATIO S  
■
action of the LT1676 switch circuitry is also load depen-  
dent. At medium to high loads, the output switch circuitry  
maintains highrisetimeforgoodefficiency. Atlightloads,  
rise time is deliberately reduced to avoid pulse skipping  
behavior.  
Automotive DC/DC Converters  
Telecom 48V Step-Down Converters  
Cellular Phone Battery Charger Accessories  
IEEE 1394 Step-Down Converters  
■
■
■
The available SO-8 package and 100kHz switching fre-  
quency allow for minimal PC board area requirements.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
Efficiency vs V and ILOAD  
IN  
IN  
8V TO 50V  
5
90  
80  
V
IN  
1
2
3
SHDN  
V
CC  
220µH*  
5V  
400mA  
36.5k  
V
SW  
70  
+
+
39µF  
63V  
100µF  
10V  
MBR160  
LT1676  
60  
50  
40  
30  
20  
1%  
7
8
FB  
6
SYNC  
V
C
2200pF  
V
= 12V  
= 24V  
IN  
12.1k  
1%  
V
IN  
100pF  
22k  
GND  
4
V
= 36V  
= 48V  
IN  
V
IN  
1676 F01  
*65T #30 ON MAGNETICS  
MPP #55030  
1
10  
100  
1000  
I
(mA)  
LOAD  
1676 TA01  
Figure 1  
1
1234567...16

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