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MAX763A

更新时间： 2024-11-08 14:57:35
品牌 Logo 应用领域
亚德诺 - ADI DC-DC转换器
页数 文件大小 规格书
12页 135K
描述
3.3V、降压型、电流模式PWM DC-DC转换器

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MAX763A 数据手册

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19-0190; Rev 0; 9/93  
3 .3 V, S t e p -Do w n ,  
Cu rre n t -Mo d e P WM DC-DC Co n ve rt e rs  
48/MX763A  
__________________Ge n e ra l De s c rip t io n  
________________________________Fe a t u re s  
The MAX748A/MAX763A are 3.3V-output CMOS, step-  
d own s witc hing re g ula tors . The MAX748A a c c e p ts  
inputs from 3.3V to 16V and delivers up to 500mA. The  
MAX763A accepts inputs between 3.3V and 11V and  
delivers up to 500mA. Typical efficiencies are 85% to  
90%. Quiescent supply current is 1.4mA (MAX763A),  
and only 0.2µA in shutdown.  
♦ Up to 500mA Load Currents  
♦ Guaranteed 159kHz to 219.5kHz Current-Mode  
PWM  
♦ 85% to 90% Efficiencies  
♦ 1.7mA Quiescent Current (MAX748A)  
1.4mA Quiescent Current (MAX763A)  
Pulse-width-modulation (PWM) current-mode control pro-  
vides precise output regulation and excellent transient  
responses. Output voltage accuracy is guaranteed to be  
± 5% ove r line , loa d , a nd te mp e ra ture va ria tions .  
Fixed-frequency switching allows easy filtering of output  
ripple and noise, as well as the use of small external  
components. A 22µH inductor works in most applica-  
tions, so no magnetics design is necessary.  
♦ 0.2µA Shutdown Supply Current  
♦ 22µH Preselected Inductor Value;  
No Component Design Required  
♦ Overcurrent, Soft-Start, and Undervoltage  
Lockout Protection  
♦ Cycle-by-Cycle Current Limiting  
♦ 8-Pin DIP/SO Packages (MAX763A)  
The MAX748A/MAX763A also feature cycle-by-cycle cur-  
rent limiting, overcurrent limiting, undervoltage lockout,  
and programmable soft-start protection. The MAX748A  
is available in 8-pin DIP and 16-pin wide SO packages;  
the MAX763A comes in 8-pin DIP and SO packages.  
_________________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
16 Wide SO  
Dice*  
MAX748ACPA  
MAX748ACWE  
MAX748AC/D  
MAX748AEPA  
MAX748AEWE  
MAX748AMJA  
0°C to +70°C  
___________________________Ap p lic a t io n s  
5V-to-3.3V Converters  
0°C to +70°C  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
8 Plastic DIP  
16 Wide SO  
8 CERDIP  
Cellular Phones  
Portable Instruments  
Hand-Held Computers  
Ordering Information continued on last page.  
Computer Peripherals  
* 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 s  
INPUT  
3.3V TO 16V  
TOP VIEW  
OUTPUT  
3.3V  
22µH  
V+  
LX  
MAX748A  
SHDN  
REF  
SS  
V+  
1
2
3
4
8
7
6
5
LX  
ON/OFF  
SHDN  
OUT  
CC  
MAX748A  
MAX763A  
GND  
OUT  
100µF  
CC  
REF  
SS  
GND  
DIP  
Pin Configurations continued on last page.  
_______________________________________________________________________ Maxim Integrated Products  
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .  
1234567...12

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