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MAX1857

更新时间： 2024-09-16 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
10页 245K
描述
500mA、具有纹波抑制的LDO，μMAX封装

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MAX1857 数据手册

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19-1812; Rev 0; 1/01  
500mA, Low-Dropout,  
Ripple-Rejecting LDO in µMAX  
General Description  
Features  
The MAX1857 low-dropout linear regulator operates  
from a +2.5V to +5.5V supply and delivers a guaran-  
teed 500mA load current with low 120mV dropout. The  
high-accuracy ( 1%) output voltage is preset at an  
internally trimmed 4.75V or can be adjusted from 1.25V  
to 5.0V with an external resistive divider.  
o Guaranteed 500mA Output Current  
o Low 120mV Dropout at 500mA  
o Up to 1ꢀ Output Voꢁtaꢂe Aꢃꢃuraꢃc  
Preset at 4.75V  
Adjustabꢁe from 1.25V to 5.0V  
An internal PMOS pass transistor allows the low 135µA  
supply current to remain independent of load, making  
this device ideal for portable battery-operated equip-  
ment such as personal digital assistants (PDAs), cellu-  
lar phones, cordless phones, base stations, and  
notebook computers.  
o Reset Output with 4.5ms Timeout Period  
o Low 135µA Ground Current  
o 0.1µA Shutdown Current  
o Thermaꢁ Overꢁoad Proteꢃtion  
o Output Current Limit  
Other features include an active-low open-drain reset  
output with a 4.5ms timeout period that indicates when  
the output is out of regulation, a 0.1µA shutdown mode,  
short-circuit protection, and thermal shutdown protec-  
tion. The device is available in a miniature 8-pin µMAX  
package. For higher power applications, refer to the  
MAX1792 and MAX1793 data sheets.  
o Tinc µMAX Paꢃkaꢂe  
Ordering Information  
________________________Applications  
Notebook Computers  
Cellular and Cordless Telephones  
PDAs  
PART*  
TEMP. RANGE  
PIN-PACKAGE  
MAX1857EUA47  
-40°C to +85°C  
8 µMAX  
*Contact factory for other preset output voltages.  
Palmtop Computers  
Base Stations  
USB Hubs  
Docking Stations  
Typical Operating Circuit  
Pin Configuration  
TOP VIEW  
V
= +5V  
IN  
V
= 4.75V  
IN  
OUT  
IN  
OUT  
OUT  
C
C
OUT  
3.3µF  
IN  
IN  
IN  
1
2
3
4
8
7
6
5
OUT  
OUT  
SET  
1µF  
R
RST  
100k  
MAX1857  
MAX1857  
RST  
ON  
TO  
µC  
SHDN  
SET  
RST  
SHDN  
GND  
OFF  
µMAX  
GND  
________________________________________________________________ Maxim Integrated Products  
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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