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MAX1745

更新时间： 2024-11-13 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
14页 256K
描述
High-Voltage, Step-Down DC-DC Controller in レMAX

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MAX1745 数据手册

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19-1776; Rev 1; 10/01  
High-Voltage, Step-Down DC-DC  
Controller in µMAX  
General Description  
____________________________Features  
The MAX1744/MAX1745 are step-down DC-DC con-  
trollers capable of handling up to 36V inputs. These  
parts use a proprietary current-limited control scheme  
for excellent light- and full-load efficiency, while their  
330kHz (max) switching frequency permits small exter-  
nal components for space-critical applications.  
Operation to 100% duty cycle permits the lowest possi-  
ble dropout voltage.  
o High-Voltage Operation (up to 36V IN)  
o Efficiency >90%  
o Output Power Capability Exceeds 50W  
o 10-Pin µMax Package  
o Low-Dropout Voltage  
o 100% (max) Duty Cycle  
The MAX1744 contains an internal feedback network  
that provides a pin-selectable output voltage of either  
3.3V or 5V. The MAX1745 uses an external feedback  
network to generate an adjustable output voltage  
between 1.25V and 18V.  
o 90µA Quiescent Current  
o 4µA Shutdown Current  
o Up to 330kHz Switching Frequency  
o Output Voltage  
The MAX1744/MAX1745 are available in a space-sav-  
ing 10-pin µMAX package.  
5V or 3.3V (MAX1744)  
Adjustable 1.25V to 18V (MAX1745)  
o Current-Limited Control Scheme  
________________________Applications  
Automotive Electronics  
Telecom Systems  
Ordering Information  
Wall-Cube-Powered Devices  
Industrial Control Systems  
Firewire/IEEE1394  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +125°C  
-40°C to +85°C  
-40°C to +125°C  
PIN-PACKAGE  
10 µMAX  
MAX1744EUB  
MAX1744AUB  
MAX1745EUB  
MAX1745AUB  
10 µMAX  
10 µMAX  
10 µMAX  
Typical Operating Circuit  
Pin Configuration  
TOP VIEW  
IN  
4.5V TO 36V  
IN VH  
SHDN  
EXT  
P
GND  
VL  
1
2
3
4
5
10 IN  
ON  
5V  
OFF  
9
8
7
6
EXT  
VH  
MAX1744  
MAX1745  
3/5  
3.3V  
REF  
3/5 (FB)  
OUT  
SHDN  
CS  
MAX1744  
VL  
CS  
REF  
OUT  
µMAX  
OUT  
3.3V  
GND  
OR 5V  
( ) ARE FOR MAX1745 ONLY.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...14

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