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MAX730

更新时间： 2024-11-05 22:12:31
品牌 Logo 应用领域
美信 - MAXIM 转换器
页数 文件大小 规格书
16页 230K
描述
5V, Step-Down, Current-Mode PWM DC-DC Converters

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MAX730 数据手册

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19-0165; Rev 2; 1/96  
5 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  
038/MX74A  
__________________Ge n e ra l De s c rip t io n  
________________________________Fe a t u re s  
♦ 750mA Load Currents (MAX738A/MAX744A)  
♦ High-Frequency, Current-Mode PWM  
The MAX730A/MAX738A/MAX744A a re 5V-outp ut  
CMOS, step-down switching regulators. The MAX738A/  
MAX744A accept inputs from 6V to 16V and deliver  
750mA. The MAX744A guarantees 500mA load capa-  
bility for inputs above 6V and has tighter oscillator fre-  
quency limits for low-noise (radio) applications. The  
MAX730A accepts inputs between 5.2V and 11V and  
delivers 450mA for inputs above 6V. Typical efficien-  
c ie s a re 85% to 96%. Quie s c e nt s up p ly c urre nt is  
1.7mA and only 6µA in shutdown.  
♦ 159kHz to 212.5kHz Guaranteed Oscillator  
Frequency Limits (MAX744A)  
♦ 85% to 96% Efficiencies  
♦ 1.7mA Quiescent Current  
♦ 6µA Shutdown Supply Current  
Pulse-width modulation (PWM) current-mode control  
provides precise output regulation and excellent tran-  
sient responses. Output voltage accuracy is guaran-  
teed to be ±5% over line, load, and temperature varia-  
tions. Fixed-frequency switching allows easy filtering of  
output ripple and noise, as well as the use of small  
external components. These regulators require only a  
single inductor value to work in most applications, so  
no inductor design is necessary.  
♦ Single Preselected Inductor Value,  
No Component Design Required  
♦ Overcurrent, Soft-Start, and Undervoltage  
Lockout Protection  
♦ Cycle-by-Cycle Current Limiting  
♦ 8-Pin DIP/SO Packages (MAX730A)  
_________________Ord e rin g In fo rm a t io n  
The MAX730A/MAX738A/MAX744A also feature cycle-  
by-cycle current limiting, overcurrent limiting, undervolt-  
age lockout, and programmable soft-start protection.  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
8 SO  
MAX730ACPA  
MAX730ACSA  
MAX730AC/D  
MAX730AEPA  
MAX730AESA  
MAX730AMJA  
0°C to +70°C  
___________________________Ap p lic a t io n s  
0°C to +70°C  
Dice*  
Portable Instruments  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
8 Plastic DIP  
8 SO  
Cellular Phones and Radios  
Personal Communicators  
Distributed Power Systems  
Computer Peripherals  
8 CERDIP  
Ordering Information continued at end of data sheet.  
*Contact factory for dice specifications.  
_________________P in Co n fig u ra t io n s  
__________Typ ic a l Op e ra t in g Circ u it  
INPUT  
6V TO 16V  
TOP VIEW  
OUTPUT  
5V  
33µH  
V+  
68µF  
LX  
SHDN  
REF  
SS  
V+  
1
2
3
4
8
7
6
5
100µF  
MAX738A  
MAX744A  
LX  
MAX730A  
MAX738A  
MAX744A  
ON/OFF  
SHDN  
REF  
OUT  
CC  
GND  
OUT  
CC  
DIP  
SS  
GND  
Pin Configurations continued on last page.  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800  
1234567...16

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