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MAX639CPA

更新时间： 2024-10-03 22:25:47
品牌 Logo 应用领域
美信 - MAXIM 转换器
页数 文件大小 规格书
12页 168K
描述
5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters

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MAX639CPA 数据手册

 浏览型号MAX639CPA的Datasheet PDF文件第2页浏览型号MAX639CPA的Datasheet PDF文件第3页浏览型号MAX639CPA的Datasheet PDF文件第4页浏览型号MAX639CPA的Datasheet PDF文件第5页浏览型号MAX639CPA的Datasheet PDF文件第6页浏览型号MAX639CPA的Datasheet PDF文件第7页 
19-4505; Rev 3; 8/97  
5 V/3 .3 V/3 V/Ad ju s t a b le , Hig h -Effic ie n c y,  
Lo w IQ, S t e p -Do w n DC-DC Co n ve rt e rs  
940/MAX653  
_______________Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
♦ High Efficiency for a Wide Range of Load Currents  
♦ 10µA Quiescent Current  
The MAX639/MAX640/MAX653 ste p-down switc hing  
regulators provide high efficiency over a wide range of  
load currents, delivering up to 225mA. A current-limiting  
pulse-frequency-modulated (PFM) control scheme gives  
the d e vic e s the b e ne fits of p uls e -wid th-mod ula te d  
(PWM) converters (high efficiency at heavy loads), while  
using only 10µA of supply current (vs. 2mA to 10mA for  
PWM converters). The result is high efficiency over a  
wide range of loads.  
♦ Output Currents Up to 225mA  
♦ Preset or Adjustable Output Voltage:  
5.0V (MAX639)  
3.3V (MAX640)  
3.0V (MAX653)  
The MAX639/MAX640/MAX653 inp ut ra ng e is 4V to  
11.5V, and the devices provide lower preset output volt-  
ages of 5V, 3.3V, and 3V, respectively. Or, the output  
can be user-adjusted to any voltage from 1.3V to the  
input voltage.  
♦ Low-Battery Detection Comparator  
♦ Current-Limiting PFM Control Scheme  
The MAX639/MAX640/MAX653 have an internal 1A power  
MOSFET switch, making them ideal for minimum-compo-  
nent, low- and medium-power applications. For increased  
output drive capability, use the MAX649/MAX651/MAX652  
step-down controllers, which drive an external P-channel  
FET to deliver up to 5W.  
______________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
8 SO  
MAX639CPA  
MAX639CSA  
MAX639C/D  
MAX639EPA  
MAX639ESA  
MAX639MJA  
0°C to +70°C  
0°C to +70°C  
Dice*  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
8 Plastic DIP  
8 SO  
________________________Ap p lic a t io n s  
9V Battery to 5V, 3.3V, or 3V Conversion  
High-Efficiency Linear Regulator Replacement  
Portable Instruments and Handy-Terminals  
5V-to-3.3V Converters  
8 CERDIP  
Ordering Information continued on last page.  
* Contact factory for dice specifications.  
__________Typ ic a l Op e ra t in g Circ u it  
__________________P in Co n fig u ra t io n  
TOP VIEW  
INPUT  
5.5V TO 11.5V  
OUTPUT  
5V  
V+  
225mA  
LX  
VOUT  
LBO  
8
7
6
5
1
2
3
4
SHDN  
VFB  
MAX639  
MAX640  
MAX653  
MAX639  
SHDN  
LBI  
ON/OFF  
VOUT  
LBO  
LBI  
V+  
LX  
LOW-BATTERY  
DETECTOR  
OUTPUT  
LOW-BATTERY  
DETECTOR  
INPUT  
GND  
DIP/SO  
VFB  
GND  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 408-737-7600 ext. 3468.  
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MAX639CPA 替代型号

型号 品牌 替代类型 描述 数据表
MAX639EPA MAXIM

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